{"T2": {"n": 2, "t": "Internal Medicine II", "d": "Sep 22 2026", "q": [{"n": 1, "s": "A 20-year-old tall, thin man has sudden right pleuritic chest pain with mild dyspnea. He is hemodynamically stable; chest X-ray shows a small apical pneumothorax. What is the most appropriate initial approach?", "o": [["A", "Immediate chest tube for all pneumothoraces"], ["B", "Urgent needle decompression"], ["C", "Admit for immediate surgery"], ["D", "Observation with oxygen if needed, based on symptoms and size"]], "c": ["D)", "Observation with oxygen if needed, based on symptoms and size"], "co": "Stable small primary spontaneous pneumothorax", "ct": "Interpretation", "w": "Small stable primary spontaneous pneumothorax may be managed with observation/oxygen or aspiration depending on size and symptoms; overtreatment of tiny stable cases is the named trap.", "d": "Tall thin young patient + small stable pneumothorax is the exact primary-spontaneous profile from the source's terminology table.", "t": "The reflex 'every pneumothorax needs a chest tube' is the overtreatment trap the source warns against.", "f": "Small stable primary pneumothorax: observe/aspirate by size and symptoms; reserve the tube for large/symptomatic/secondary cases.", "r": "Small stable primary spontaneous pneumothorax may be managed with observation/oxygen or aspiration depending on size and symptoms; overtreatment of tiny stable cases is the named trap.", "x": [["A) Immediate chest tube for all pneumothoraces", "Small stable primary cases may be observed or aspirated; not every pneumothorax gets a tube."], ["B) Urgent needle decompression", "Needle decompression is for tension physiology; this patient is stable with a small pneumothorax."], ["C) Admit for immediate surgery", "Surgery is definitive repair for persistent/recurrent cases, not first-line small-stable management."]]}, {"n": 2, "s": "A patient with severe pneumonia has ABG: PaO2 52 mmHg, PaCO2 32 mmHg, pH 7.47. Which classification of respiratory failure does this represent?", "o": [["A", "Type 2 (hypercapnic) respiratory failure"], ["B", "Acute respiratory acidosis"], ["C", "Type 1 (hypoxemic) respiratory failure"], ["D", "Mixed type 1 and type 2 failure"]], "c": ["C)", "Type 1 (hypoxemic) respiratory failure"], "co": "Type 1 vs Type 2 respiratory failure", "ct": "Recall", "w": "Type 1 respiratory failure is hypoxemia with normal or low PaCO2 (V/Q mismatch, shunt, diffusion, pneumonia); Type 2 adds hypercapnia from alveolar hypoventilation.", "d": "PaO2 52 with a LOW PaCO2 and alkalotic pH is the Type 1 picture the source defines.", "t": "High CO2 is the knee-jerk 'respiratory failure' reflex; Type 1 is hypoxemia without hypercapnia.", "f": "Type 1 = low PaO2, normal/low PaCO2; Type 2 = low PaO2 + high PaCO2.", "r": "Type 1 respiratory failure is hypoxemia with normal or low PaCO2 (V/Q mismatch, shunt, diffusion, pneumonia); Type 2 adds hypercapnia from alveolar hypoventilation.", "x": [["A) Type 2 (hypercapnic) respiratory failure", "Type 2 requires low PaO2 WITH high PaCO2; this PaCO2 is low."], ["B) Acute respiratory acidosis", "The pH is alkalotic and CO2 is low — that is not respiratory acidosis."], ["D) Mixed type 1 and type 2 failure", "Only one failure pattern is present: hypoxemia with a low/normal CO2."]]}, {"n": 3, "s": "A 55-year-old man with resolving pneumonia develops fever again with a dull, silent right base. Thoracentesis returns thick pus. Which intervention pair is required?", "o": [["A", "Drain the pleural space and give antibiotics"], ["B", "Antibiotics alone with close observation"], ["C", "Anti-tuberculous therapy only"], ["D", "Repeat thoracentesis weekly"]], "c": ["A)", "Drain the pleural space and give antibiotics"], "co": "Empyema from the fatal-miss list — source control", "ct": "Interpretation", "w": "The final fatal-miss table states: empyema → drain plus antibiotics — infected pleural space needs source control.", "d": "Recurrent fever after pneumonia with pus at thoracentesis is the empyema row of the fatal-miss list.", "t": "Antibiotics-only is the planted error; the list names it the empyema fatal miss.", "f": "Empyema = drainage plus antibiotics; never antibiotics alone.", "r": "The final fatal-miss table states: empyema → drain plus antibiotics — infected pleural space needs source control.", "x": [["B) Antibiotics alone with close observation", "The fatal-miss list pairs empyema with 'drain plus antibiotics'; medical therapy alone is the named miss."], ["C) Anti-tuberculous therapy only", "Pus with pneumonia is empyema, not tuberculous effusion."], ["D) Repeat thoracentesis weekly", "A single-tap strategy does not provide the source control an empyema needs."]]}, {"n": 4, "s": "A 30-year-old man has a sucking chest wound after a stab injury, with air moving through the wound during inspiration. What is the correct immediate wound management?", "o": [["A", "Fully seal the wound with an occlusive dressing on all four sides"], ["B", "Pressure dressing to stop air movement"], ["C", "Occlusive dressing taped on three sides (or a vented chest seal)"], ["D", "Leave the wound open until surgery"]], "c": ["C)", "Occlusive dressing taped on three sides (or a vented chest seal)"], "co": "Open pneumothorax — dressing", "ct": "Recall", "w": "Open pneumothorax is managed with an occlusive dressing taped on three sides or a vented chest seal, followed by a chest tube away from the wound.", "d": "A sucking chest wound is the source's open-pneumothorax trigger; the three-sided/vented concept is the tested rule.", "t": "Full sealing is the trap — the source warns a completely sealed wound converts open to tension.", "f": "Open pneumothorax: three-sided/vented dressing, then chest tube; never fully seal.", "r": "Open pneumothorax is managed with an occlusive dressing taped on three sides or a vented chest seal, followed by a chest tube away from the wound.", "x": [["A) Fully seal the wound with an occlusive dressing on all four sides", "A fully sealed wound can convert an open pneumothorax into a tension pneumothorax."], ["B) Pressure dressing to stop air movement", "The goal is one-way escape of air, not stopping all air movement."], ["D) Leave the wound open until surgery", "Immediate vented/three-sided coverage plus chest tube is the emergency step; an open sucking wound is not left bare."]]}, {"n": 5, "s": "A 32-year-old man has 6 weeks of cough, night sweats, weight loss, and hemoptysis with a right apical cavitary lesion on chest X-ray. According to the hemoptysis differential, which diagnosis is most likely?", "o": [["A", "Lung cancer"], ["B", "Bronchiectasis"], ["C", "Pulmonary embolism"], ["D", "Tuberculosis"]], "c": ["D)", "Tuberculosis"], "co": "Hemoptysis differential — apical cavity pattern", "ct": "Interpretation", "w": "The final hemoptysis table maps chronic cough + weight loss + night sweats + apical cavity to TB — the constitutional cluster and apical distribution are the discriminators.", "d": "Apical cavity plus night sweats/weight loss in a young patient is the exact TB row of the source's hemoptysis differential.", "t": "Lung cancer is the camouflage; age and the apical-cavity-plus-constitution pattern hand it to TB.", "f": "Chronic cough + night sweats + weight loss + apical cavity = TB; smoker-mass = cancer; purulent daily sputum = bronchiectasis.", "r": "The final hemoptysis table maps chronic cough + weight loss + night sweats + apical cavity to TB — the constitutional cluster and apical distribution are the discriminators.", "x": [["A) Lung cancer", "Cancer fits an older smoker with weight loss and a persistent mass/non-resolving opacity, not night sweats with an apical cavity in a young patient."], ["B) Bronchiectasis", "Bronchiectasis gives daily purulent sputum with recurrent infections and clubbing, not constitutional symptoms with an apical cavity."], ["C) Pulmonary embolism", "PE gives sudden pleuritic pain after a flight/OCP, not chronic weight loss with night sweats."]]}, {"n": 6, "s": "A 20-year-old asthmatic in the emergency department suddenly becomes quieter, with less wheeze, increasing drowsiness, and rising PaCO2 on blood gas. Which response matches the correct reflex in the fatal-miss list?", "o": [["A", "Reassure the family that the wheeze is resolving"], ["B", "Repeat salbutamol and observe for 2 hours"], ["C", "Order a chest X-ray before any escalation"], ["D", "Treat as life-threatening asthma with ICU/intubation preparation"]], "c": ["D)", "Treat as life-threatening asthma with ICU/intubation preparation"], "co": "Fatal-miss list — silent chest reflex", "ct": "Interpretation", "w": "The fatal-miss table maps 'silent chest in asthma' to 'treat as life-threatening with ICU/intubation preparation' — less wheeze can mean less airflow.", "d": "Quieter chest + drowsiness + rising PaCO2 is the exact fatal-miss cluster of the final table.", "t": "The 'wheeze is resolving' read is the trap the source pins as the asthma fatal miss.", "f": "Silent/quiet chest in acute asthma = impending arrest: act like it, escalate now.", "r": "The fatal-miss table maps 'silent chest in asthma' to 'treat as life-threatening with ICU/intubation preparation' — less wheeze can mean less airflow.", "x": [["A) Reassure the family that the wheeze is resolving", "Less wheeze can mean less airflow; the source names silent chest a red flag, not a reassuring finding."], ["B) Repeat salbutamol and observe for 2 hours", "Routine repeat bronchodilators without escalation underplays impending respiratory arrest."], ["C) Order a chest X-ray before any escalation", "The life-threatening tier demands immediate treatment/intubation preparation, not imaging first."]]}, {"n": 7, "s": "A 24-year-old woman had a pulmonary embolism while on a combined oral contraceptive. After completing anticoagulation, which contraceptive guidance is correct?", "o": [["A", "Combined OCP may resume after 6 months of anticoagulation"], ["B", "Progestin-only pills are equally contraindicated"], ["C", "Avoid estrogen-containing contraception permanently after VTE"], ["D", "The OCP can resume if the D-dimer normalizes"]], "c": ["C)", "Avoid estrogen-containing contraception permanently after VTE"], "co": "OCP after VTE — estrogen contraindication", "ct": "Recall", "w": "Estrogen/OCP is a VTE risk factor and becomes contraindicated after PE; the source names combined OCP avoidance as the recurrence-prevention rule.", "d": "The PE-on-OCP story is the source's OCP/VTE contraindication stem.", "t": "The trap is 'enough time has passed, resume the OCP'; prior VTE is a standing estrogen contraindication.", "f": "Estrogen/OCP after VTE = contraindicated; the source says avoid estrogen-containing contraception.", "r": "Estrogen/OCP is a VTE risk factor and becomes contraindicated after PE; the source names combined OCP avoidance as the recurrence-prevention rule.", "x": [["A) Combined OCP may resume after 6 months of anticoagulation", "Prior VTE is an estrogen contraindication; combined OCPs are not restarted after VTE."], ["B) Progestin-only pills are equally contraindicated", "The estrogen component is the VTE risk; progestin-only options are the safer pathway."], ["D) The OCP can resume if the D-dimer normalizes", "D-dimer normalization does not lift the estrogen contraindication."]]}, {"n": 8, "s": "A 32-year-old man has recurrent lung infections, bronchiectasis on HRCT, and chronic pancreatitis with steatorrhea. Which investigation is most likely to establish the diagnosis?", "o": [["A", "HRCT alone"], ["B", "Serum alpha-1 antitrypsin level"], ["C", "Nasal nitric oxide testing for primary ciliary dyskinesia"], ["D", "Sweat chloride or CFTR genetic testing"]], "c": ["D)", "Sweat chloride or CFTR genetic testing"], "co": "Cystic fibrosis — adult presentation", "ct": "Interpretation", "w": "Recurrent infections with pancreatic insufficiency points to cystic fibrosis — sweat chloride/CFTR testing is the diagnostic clue, and milder CF can present in adults.", "d": "Recurrent sinopulmonary infections + pancreatic insufficiency + bronchiectasis is the source's CF cluster, including the adult-presentation warning.", "t": "The trap is 'CF only in children'; the source warns milder CF surfaces in adults with bronchiectasis, infertility, sinus disease, or pancreatitis.", "f": "Recurrent lung infections + pancreatic insufficiency = CF; confirm with sweat chloride/CFTR.", "r": "Recurrent infections with pancreatic insufficiency points to cystic fibrosis — sweat chloride/CFTR testing is the diagnostic clue, and milder CF can present in adults.", "x": [["A) HRCT alone", "HRCT shows the bronchiectasis but does not establish CF as the cause."], ["B) Serum alpha-1 antitrypsin level", "A1AT testing addresses emphysema/liver disease, not pancreatic-insufficiency lung disease."], ["C) Nasal nitric oxide testing for primary ciliary dyskinesia", "PCD/Kartagener causes bronchiectasis with otitis, sinusitis, and situs inversus — this man's pancreatitis and steatorrhea point to CF and sweat chloride/CFTR testing."]]}, {"n": 9, "s": "A 22-year-old woman with asthma presents to the emergency department after 3 hours of worsening breathlessness despite repeated salbutamol. She is speaking in short sentences with accessory-muscle use, RR 28/min, HR 110/min, and SpO2 91% on room air. Which finding would change her categorization to life-threatening asthma?", "o": [["A", "SpO2 of 91% on room air"], ["B", "Silent chest on auscultation"], ["C", "HR of 110/min"], ["D", "RR of 28/min"]], "c": ["B)", "Silent chest on auscultation"], "co": "Acute asthma severity — life-threatening signs", "ct": "Interpretation", "w": "The source's severity ladder moves from acute severe (short sentences, RR/HR rise, accessory muscles) to life-threatening once silent chest, confusion, cyanosis, bradycardia, exhaustion, or a rising PaCO2 appear. Silent chest means airflow is critically low.", "d": "The vignette stops one step below the life-threatening tier; the examiner wants the single feature that pushes the patient into impending-arrest territory.", "t": "Less wheeze looks like improvement — the source names silent chest as the classic false-reassurance trap in this exact ladder.", "f": "If the patient is quiet, confused, exhausted, cyanosed, bradycardic, or PaCO2 is normal/rising, treat as life-threatening, not as resolving.", "r": "The source's severity ladder moves from acute severe (short sentences, RR/HR rise, accessory muscles) to life-threatening once silent chest, confusion, cyanosis, bradycardia, exhaustion, or a rising PaCO2 appear.", "x": [["A) SpO2 of 91% on room air", "Hypoxia is concerning, but severe asthma is still graded by speech, RR, HR, exhaustion, silent chest, and PaCO2 trend — SpO2 91% alone does not make it life-threatening."], ["C) HR of 110/min", "Tachycardia is expected in acute severe asthma; it is not the life-threatening criterion."], ["D) RR of 28/min", "Tachypnea is a severity feature, but the life-threatening tier is marked by silent chest, confusion, cyanosis, bradycardia, exhaustion, or rising PaCO2."]]}, {"n": 10, "s": "A 24-year-old asthmatic uses her blue salbutamol inhaler three times a week and wakes with cough and wheeze two nights a week. She has never been on a controller. What is the most appropriate next step?", "o": [["A", "Continue SABA-only therapy and recheck in 6 months"], ["B", "Schedule spirometry and start nothing until it returns"], ["C", "Refer for allergy testing before any treatment"], ["D", "Start an ICS-containing controller"]], "c": ["D)", "Start an ICS-containing controller"], "co": "Chronic asthma control — controller escalation", "ct": "Interpretation", "w": "Recurrent day and night symptoms plus regular reliever use mean poor control; the source's chronic answer is an ICS-containing controller, never SABA-only or LABA-only maintenance.", "d": "Daytime symptoms, nocturnal waking, and frequent blue-inhaler use are the three control signals the source lists for stepping up.", "t": "The examiner dresses the 'no controller yet' patient as a mild case; reliever frequency is the tell.", "f": "Frequent salbutamol use = poor control: add or step up ICS-containing therapy, not SABA.", "r": "Recurrent day and night symptoms plus regular reliever use mean poor control; the source's chronic answer is an ICS-containing controller, never SABA-only or LABA-only maintenance.", "x": [["A) Continue SABA-only therapy and recheck in 6 months", "Frequent reliever use signals poor control and future exacerbation risk; SABA alone does not treat inflammation."], ["B) Schedule spirometry and start nothing until it returns", "The escalating symptoms already justify controller initiation; treatment need not wait on spirometry."], ["C) Refer for allergy testing before any treatment", "Allergen/trigger review is part of the workup, not a prerequisite that delays controller therapy."]]}, {"n": 11, "s": "A 38-year-old non-smoker is found to have emphysema with basilar predominance on imaging and intermittent liver enzyme elevation. What is the most likely explanation?", "o": [["A", "Smoking-related COPD"], ["B", "Chronic asthma with fixed obstruction"], ["C", "Alpha-1 antitrypsin is irrelevant to emphysema"], ["D", "Alpha-1 antitrypsin deficiency"]], "c": ["D)", "Alpha-1 antitrypsin deficiency"], "co": "Young COPD — alpha-1 antitrypsin deficiency", "ct": "Interpretation", "w": "Young patient, minimal smoking, basilar panacinar emphysema, and liver disease is the classic alpha-1 antitrypsin deficiency cluster, and it must be triggered by this exact story.", "d": "Age <45, minimal smoking, basilar distribution, and liver involvement are the four source clues; the stem plants all of them.", "t": "The examiner hides a genetic cause behind a familiar 'emphysema' label; the young non-smoker profile unmaskes it.", "f": "Young non-smoker with basilar emphysema or liver disease → alpha-1 antitrypsin deficiency.", "r": "Young patient, minimal smoking, basilar panacinar emphysema, and liver disease is the classic alpha-1 antitrypsin deficiency cluster, and it must be triggered by this exact story.", "x": [["A) Smoking-related COPD", "His age and minimal smoking exposure argue against ordinary smoking COPD."], ["B) Chronic asthma with fixed obstruction", "Asthma does not produce basilar panacinar emphysema with liver enzyme elevation."], ["C) Alpha-1 antitrypsin is irrelevant to emphysema", "A1AT deficiency is exactly the young non-smoker emphysema phenotype the source flags."]]}, {"n": 12, "s": "A 30-year-old woman has sudden mild dyspnea and pleuritic chest discomfort after a 3-hour bus ride. She is hemodynamically normal with no leg swelling. Wells score is low; D-dimer is negative. What is the most appropriate next step?", "o": [["A", "PE is ruled out; no further imaging is needed"], ["B", "Proceed to CTPA for confirmation"], ["C", "Repeat the D-dimer in 12 hours"], ["D", "Start anticoagulation empirically"]], "c": ["A)", "PE is ruled out; no further imaging is needed"], "co": "Low pre-test probability PE — D-dimer rule-out", "ct": "Interpretation", "w": "In low pre-test probability, a negative D-dimer rules out PE; D-dimer is a rule-out tool, not a confirmatory test.", "d": "Low Wells + negative D-dimer is the source's exact rule-out pairing; the mild short-trip story is deliberately low-risk.", "t": "The trap is 'CTPA anyway' or reading a negative D-dimer as needing confirmation — the test is designed to avoid imaging.", "f": "Low probability + negative D-dimer = PE ruled out; D-dimer never confirms.", "r": "In low pre-test probability, a negative D-dimer rules out PE; D-dimer is a rule-out tool, not a confirmatory test.", "x": [["B) Proceed to CTPA for confirmation", "A negative D-dimer in low pre-test probability rules out PE and avoids imaging."], ["C) Repeat the D-dimer in 12 hours", "A single negative D-dimer in low probability is sufficient rule-out."], ["D) Start anticoagulation empirically", "With PE ruled out by the low-probability/negative-D-dimer pair, anticoagulation is not indicated."]]}, {"n": 13, "s": "A 35-year-old woman has chronic sinusitis, nasal crusting, hemoptysis, hematuria with RBC casts, and c-ANCA/PR3 positivity. Which diagnosis is most likely?", "o": [["A", "Goodpasture syndrome"], ["B", "Granulomatosis with polyangiitis (GPA)"], ["C", "Microscopic polyangiitis"], ["D", "Systemic lupus erythematosus"]], "c": ["B)", "Granulomatosis with polyangiitis (GPA)"], "co": "GPA — ENT clue and c-ANCA", "ct": "Interpretation", "w": "ENT disease (sinusitis, nasal crusting) with lung-kidney involvement and c-ANCA/PR3 is GPA — the source pairs ENT clues with c-ANCA explicitly.", "d": "Sinusitis + nasal crusting + hemoptysis + hematuria + c-ANCA is the source's GPA cluster versus Goodpasture.", "t": "Goodpasture is the reflex for hemoptysis + nephritis; the ENT story hands it to GPA.", "f": "ENT disease + c-ANCA/PR3 + lung/kidney = GPA; Goodpasture = anti-GBM without ENT disease.", "r": "ENT disease (sinusitis, nasal crusting) with lung-kidney involvement and c-ANCA/PR3 is GPA — the source pairs ENT clues with c-ANCA explicitly.", "x": [["A) Goodpasture syndrome", "Goodpasture is anti-GBM with no ENT granulomatous story; this patient's sinusitis and c-ANCA point to GPA."], ["C) Microscopic polyangiitis", "MPA is p-ANCA/MPO and usually lacks the ENT granulomatous picture."], ["D) Systemic lupus erythematosus", "SLE shows low complement and anti-dsDNA, not c-ANCA with necrotizing ENT disease."]]}, {"n": 14, "s": "A 70-year-old man with worsening heart failure has bilateral pleural effusions with stony dullness at both bases. He has no fever, chest pain, or weight loss. What is the most appropriate management?", "o": [["A", "Treat the heart failure; observe the effusions"], ["B", "Diagnostic thoracentesis of both sides"], ["C", "Start antibiotics for parapneumonic effusion"], ["D", "Refer for pleurodesis"]], "c": ["A)", "Treat the heart failure; observe the effusions"], "co": "Bilateral CHF effusion — transudate logic", "ct": "Interpretation", "w": "CHF causes bilateral transudative effusions; management is diuretics and heart-failure treatment, with the typical bilateral picture not requiring routine taps.", "d": "Bilateral effusions with a clear CHF story and no unilateral warning signs (fever, pleuritic pain, weight loss, hemoptysis) is the source's 'treat the cause' scenario.", "t": "The trap is tapping every bilateral CHF effusion or calling all effusions CHF; here the CHF picture is genuine.", "f": "Typical bilateral CHF effusion = treat the HF; unilateral/atypical features force a diagnostic tap.", "r": "CHF causes bilateral transudative effusions; management is diuretics and heart-failure treatment, with the typical bilateral picture not requiring routine taps.", "x": [["B) Diagnostic thoracentesis of both sides", "Typical bilateral CHF effusions are not routinely tapped; the source's trap is tapping every bilateral CHF effusion."], ["C) Start antibiotics for parapneumonic effusion", "No fever or pneumonia picture is present; transudates need underlying-cause treatment, not antibiotics."], ["D) Refer for pleurodesis", "Recurrent malignant effusion is the pleurodesis indication, not a CHF transudate."]]}, {"n": 15, "s": "A 68-year-old man with COPD develops pneumonia. His sputum grows tiny colonies on chocolate agar but not on blood agar. Which organism is responsible?", "o": [["A", "Haemophilus influenzae"], ["B", "Streptococcus pneumoniae"], ["C", "Klebsiella pneumoniae"], ["D", "Legionella pneumophila"]], "c": ["A)", "Haemophilus influenzae"], "co": "Chocolate agar — H. influenzae", "ct": "Interpretation", "w": "H. influenzae requires the X and V factors supplied by chocolate agar, so growth on chocolate agar only is the classic culture clue.", "d": "COPD background + chocolate-agar-only growth is the exact two-clue pair from the source's organism table.", "t": "Blood agar gives no growth and tempts 'no pathogen found'; the chocolate medium is the discriminator.", "f": "Tiny colonies on chocolate agar only = H. influenzae (needs X+V factors).", "r": "H.", "x": [["B) Streptococcus pneumoniae", "Strep pneumoniae grows on blood agar; the chocolate-agar-only pattern is not its signature."], ["C) Klebsiella pneumoniae", "Klebsiella is the lactose-fermenting currant-jelly organism."], ["D) Legionella pneumophila", "Legionella is the water/AC exposure organism detected by urine antigen."]]}, {"n": 16, "s": "A 48-year-old man with pneumonia develops persistent fever. Thoracentesis returns frank pus with pH 7.0 and low glucose. What is the required management?", "o": [["A", "Antibiotics alone with repeat imaging"], ["B", "Switch antibiotics and observe"], ["C", "Pleurodesis as first-line therapy"], ["D", "Chest tube drainage plus antibiotics"]], "c": ["D)", "Chest tube drainage plus antibiotics"], "co": "Empyema — source control", "ct": "Interpretation", "w": "Pus with low pH/glucose and systemic toxicity is empyema, which needs drainage plus antibiotics — the source's one-line fatal-miss rule.", "d": "Frank pus + pH 7.0 + low glucose is the exact complicated-effusion/empyema cluster from the source table.", "t": "Antibiotics-only is the planted error; the source warns infected pleural space needs source control.", "f": "Empyema = drain plus antibiotics; antibiotics alone never suffice.", "r": "Pus with low pH/glucose and systemic toxicity is empyema, which needs drainage plus antibiotics — the source's one-line fatal-miss rule.", "x": [["A) Antibiotics alone with repeat imaging", "Empyema needs drainage plus antibiotics; medical treatment alone is the named trap."], ["B) Switch antibiotics and observe", "The infected pleural collection requires source control regardless of antibiotic choice."], ["C) Pleurodesis as first-line therapy", "Pleurodesis is for recurrent malignant effusions, not first-line empyema management."]]}, {"n": 17, "s": "A 70-year-old man with known COPD and prior hypercapnic exacerbations presents with acute breathlessness. What SpO2 target should guide his controlled oxygen therapy?", "o": [["A", "94-98%"], ["B", "88-92%"], ["C", "100% saturation"], ["D", "Greater than 90% with any flow rate"]], "c": ["B)", "88-92%"], "co": "Oxygen target in CO2-retaining COPD", "ct": "Recall", "w": "COPD patients at risk of CO2 retention are managed with controlled oxygen targeting 88-92%, not indiscriminate high-flow oxygen.", "d": "Prior hypercapnic exacerbations mark him as a CO2 retainer — the stem plants the exact risk that selects the 88-92% target.", "t": "The trap is the reflexive 'normal-saturation' oxygen target; this population gets a lower range by design.", "f": "In CO2-retaining COPD, oxygen target 88-92%, titrated, never 'give 100%'.", "r": "COPD patients at risk of CO2 retention are managed with controlled oxygen targeting 88-92%, not indiscriminate high-flow oxygen.", "x": [["A) 94-98%", "That range suits patients without CO2-retention risk; this man's history pushes the target down."], ["C) 100% saturation", "Forcing SpO2 to 100% with excessive oxygen can worsen CO2 retention in susceptible COPD patients."], ["D) Greater than 90% with any flow rate", "The flow is titrated to the target range; uncontrolled high flow defeats the purpose of controlled oxygen."]]}, {"n": 18, "s": "A 28-year-old asthmatic is using salmeterol twice daily as her only maintenance treatment, with salbutamol for symptoms. Which of the following is the correct management principle?", "o": [["A", "Add a leukotriene receptor antagonist before any ICS"], ["B", "Continue salmeterol alone since symptoms are controlled"], ["C", "LABA must be paired with an inhaled corticosteroid (ICS) in asthma"], ["D", "Switch to salbutamol alone as maintenance"]], "c": ["C)", "LABA must be paired with an inhaled corticosteroid (ICS) in asthma"], "co": "LABA monotherapy in asthma — the mortality trap", "ct": "Interpretation", "w": "Salmeterol/formoterol alone in asthma is unsafe: LABA without ICS is the named mortality trap, so any stem pairing LABA monotherapy with asthma is testing this exact error.", "d": "The stem gives LABA alone as the maintenance regimen — the single unsafe chronic combination in the source's EXAM TRAPS.", "t": "The trap is 'symptoms are controlled, so do nothing' — the source warns the exam swims in this direction whenever salmeterol/formoterol appears alone.", "f": "In asthma, LABA never travels alone: pair with ICS or the option is wrong.", "r": "Salmeterol/formoterol alone in asthma is unsafe: LABA without ICS is the named mortality trap, so any stem pairing LABA monotherapy with asthma is testing this exact error.", "x": [["A) Add a leukotriene receptor antagonist before any ICS", "The source's controller logic is ICS-containing therapy; leukotriene modifiers are not the fix for LABA monotherapy."], ["B) Continue salmeterol alone since symptoms are controlled", "LABA without ICS is unsafe in asthma — the source names it explicitly as the mortality trap."], ["D) Switch to salbutamol alone as maintenance", "SABA-only chronic treatment is the other named error; controllers prevent risk and reduce exacerbations."]]}, {"n": 19, "s": "A 40-year-old woman with known bronchiectasis develops sudden large-volume hemoptysis and is unable to clear her airway. What is the priority?", "o": [["A", "Stabilize the airway as an emergency (positioning, suction, urgent bronchial artery/airway team involvement)"], ["B", "Observe in the ward overnight"], ["C", "Start routine antibiotics and recheck in the morning"], ["D", "Arrange outpatient HRCT for next week"]], "c": ["A)", "Stabilize the airway as an emergency (positioning, suction, urgent bronchial artery/airway team involvement)"], "co": "Massive hemoptysis — airway emergency", "ct": "Recall", "w": "Massive hemoptysis in bronchiectasis reflects inflamed bronchial arteries and is an airway emergency requiring urgent stabilization — the source's one-line warning.", "d": "Sudden large-volume hemoptysis with airway compromise is exactly the emergency the source flags.", "t": "Treating it as an outpatient infection exacerbation is the plant; bleeding severity overrides routine care.", "f": "Massive hemoptysis = airway emergency: stabilize and escalate, never observe overnight.", "r": "Massive hemoptysis in bronchiectasis reflects inflamed bronchial arteries and is an airway emergency requiring urgent stabilization — the source's one-line warning.", "x": [["B) Observe in the ward overnight", "Massive hemoptysis in bronchiectasis is an airway emergency; overnight observation is the fatal miss."], ["C) Start routine antibiotics and recheck in the morning", "Antibiotics do not control bleeding from inflamed bronchial arteries."], ["D) Arrange outpatient HRCT for next week", "This is an immediate stabilization problem, not an outpatient imaging case."]]}, {"n": 20, "s": "A 65-year-old man with a 45 pack-year smoking history has worsening dyspnea and purulent sputum. He is drowsy but rousable. ABG: pH 7.28, PaCO2 72 mmHg, PaO2 52 mmHg. Which intervention is the most appropriate FIRST step?", "o": [["A", "NIV/BiPAP with controlled oxygen"], ["B", "High-flow oxygen to normalize SpO2"], ["C", "Immediate intubation and mechanical ventilation"], ["D", "Oxygen alone with repeat ABG in 2 hours"]], "c": ["A)", "NIV/BiPAP with controlled oxygen"], "co": "AECOPD with acidotic hypercapnia — NIV decision", "ct": "Interpretation", "w": "pH 7.28 with PaCO2 72 is acute-on-chronic hypercapnic respiratory failure; NIV/BiPAP is first-line if the patient is conscious, cooperative, and protects his airway, with ABG recheck after starting.", "d": "Drowsy but rousable + pH <7.35 + high PaCO2 is the exact NIV trigger pair; the ABG converts a COPD question into a ventilatory-support question.", "t": "The CO2-retaining COPD patient tempts 'give more oxygen'; the source flags high-flow oxygen and oxygen-alone as the fatal misses.", "f": "COPD + low pH + high PaCO2 = NIV if suitable; ABG decides support, not symptom severity.", "r": "pH 7.", "x": [["B) High-flow oxygen to normalize SpO2", "Indiscriminate high-flow oxygen can worsen CO2 retention; acidotic hypercapnia is a ventilatory-support question."], ["C) Immediate intubation and mechanical ventilation", "NIV/BiPAP is first-line in acidotic hypercapnic failure when the patient is conscious, cooperative, and can protect the airway."], ["D) Oxygen alone with repeat ABG in 2 hours", "Low pH plus high PaCO2 is ventilatory failure; oxygen alone while CO2 rises is the fatal miss named in the source."]]}, {"n": 21, "s": "A 55-year-old woman slips on stairs and falls on an outstretched hand. X-ray shows distal radius fracture with dorsal displacement and dorsal angulation of the distal fragment. Diagnosis and classic nerve at risk with forcible fracture manipulation?", "o": [["A", "Colles fracture; median nerve irritation"], ["B", "Smith fracture; radial nerve"], ["C", "Nightstick fracture; ulnar nerve"], ["D", "Monteggia; axillary nerve"]], "c": ["A)", "Colles fracture; median nerve irritation"], "co": "Colles pattern + associated median nerve symptoms", "ct": "Interpretation", "w": "Colles fracture — extra-articular distal radial fracture with dorsal tilt ('dinner fork' deformity) — classically from FOOSH in a postmenopausal woman; acute carpal tunnel symptoms can accompany severe displacement and manipulation.", "d": "FOOSH + dorsal displacement/angulation = Colles; median nerve symptoms (carpal-tunnel-like) can complicate", "t": "Radiographic-pattern trap", "f": "Dinner-fork deformity on wrist film = Colles; watch median nerve, reduce + cast or K-wire per displacement.", "r": "Colles fracture: distal radius fracture with dorsal angulation; treat reduction + cast (± percutaneous K-wires/plate if displaced/unstable); assess median nerve function.", "x": [["B) Smith fracture; radial nerve", "Smith fracture is Volar (palmar) angulation, the reverse pattern."], ["C) Nightstick fracture; ulnar nerve", "Nightstick fracture is isolated ulnar shaft fracture (defensive wound)."], ["D) Monteggia; axillary nerve", "Monteggia = ulnar fracture with radial head dislocation; axillary nerve is actually injured commonly by proximal humeral fracture/dislocation, not this."]]}, {"n": 22, "s": "A 60-year-old woman with shoulder pain and restricted active and passive external rotation/ abduction after a minor injury; rotator-cuff tests passively full passive motion blocked only at extremes; what likely diagnosis and initial therapy?", "o": [["A", "Adhesive capsulitis (frozen shoulder) — physiotherapy-based passive-motion regime ± local shoulder steroid/ NSAIDs"], ["B", "Rotator cuff tear — surgical repair"], ["C", "Subacromial impingement — open surgery"], ["D", "Cervical radiculopathy"]], "c": ["A)", "Adhesive capsulitis (frozen shoulder) — physiotherapy-based passive-motion regime ± local shoulder steroid/ NSAIDs"], "co": "Frozen shoulder stages and treatment", "ct": "Interpretation", "w": "Adhesive capsulitis progresses through painful/ stiff/ thawing phases with equal loss of active & passive movements (external rotation earliest); management graded — NSAID, intra-articular steroid in painful phase, physiotherapy in stiffing phase, hydrodilatation/ MUA in refractory.", "d": "Global restriction of BOTH active and passive shoulder motion, no strength deficit = adhesive capsulitis; cuff tear has weakness with preserved passive arc (initially)", "t": "Active-vs-passive-motion discrimination trap", "f": "Frozen shoulder = loss in ALL planes of active+passive motion; cuff tear = weakness with preserved passive range.", "r": "Adhesive capsulitis: 3-phase natural course (painful/freezing → stiff/frozen → thawing); management staged: NSAID/ steroid injection, then physiotherapy; diabetes/ thyroid associations.", "x": [["B) Rotator cuff tear — surgical repair", "Cuff tear shows weakness with passively intact motion isolation; surgical repair is elective when symptomatic, not first-line."], ["C) Subacromial impingement — open surgery", "Open decompression is for impingement failure of conservative courses."], ["D) Cervical radiculopathy", "Cervical radiculopathy produces dermatomal symptoms, not global shoulder restriction with preserved neck exam."]]}, {"n": 23, "s": "A 61-year-old female with long-standing type-2 diabetes presents with a swollen, warm, extremely painful first metatarsophalangeal joint of overnight onset; serum uric acid not measured yet. What investigation best confirms gout when infection is also uncertain?", "o": [["A", "Polarised light microscopy of synovial fluid — needle-shaped negatively birefringent crystals"], ["B", "Serum uric acid alone"], ["C", "X-ray at first presentation"], ["D", "ESR alone"]], "c": ["A)", "Polarised light microscopy of synovial fluid — needle-shaped negatively birefringent crystals"], "co": "Crystal identification: gout vs pseudogout vs septic", "ct": "Interpretation", "w": "Aspiration with polarised-light microscopy is the single confirmatory test — urate crystals are needle-shaped and negatively birefringent (yellow parallel/blue perpendicular, CPPD is rhomboid positive), which also lets cell count and Gram/culture exclude simultaneous septic arthritis.", "d": "Podagra (first MTP) + overnight severe pain = gout; definitive diagnosis = negatively-birefringent needle crystals on synovial fluid polarising microscopy", "t": "Investigation-choice trap — uric acid alone does not confirm", "f": "Podagra red hot toe: aspirate and polarise — hyperuricaemia alone neither confirms nor excludes an acute attack.", "r": "Acute monoarthritis: synovial fluid aspirate with microscopy/culture (gout: needle negative birefringent; pseudogout: rhomboid positive; septic: pus/positive culture).", "x": [["B) Serum uric acid alone", "Serum uric acid may be normal during flares and idiosyncratic between gout and pseudogout — never diagnostic on its own."], ["C) X-ray at first presentation", "Punched-out erosions with overhanging edges appear in chronic tophaceous disease, not the first acute attack."], ["D) ESR alone", "ESR/CRP are nonspecific inflammatory markers, not discriminating tests."]]}, {"n": 24, "s": "A 24-year-old soldier sustains mid-shaft humeral fracture with wrist drop and sensory loss over first dorsal webspace. Which nerve and its expected examination finding?", "o": [["A", "Radial nerve — wrist drop + sensory loss dorsal first webspace"], ["B", "Median nerve — thenar wasting + pulp sensory loss"], ["C", "Ulnar nerve — Froment sign"], ["D", "Axillary — deltoid paralysis"]], "c": ["A)", "Radial nerve — wrist drop + sensory loss dorsal first webspace"], "co": "Humeral shaft fracture radial palsy", "ct": "Recall", "w": "Radial nerve traverses the spiral groove; mid-shaft humeral fractures are its classic injury point above elbow, producing wrist/ finger extension loss with dorsal radial sensory loss.", "d": "Midshaft humeral spiral fracture + wrist drop = radial nerve palsy", "t": "Nerve–fracture level trap", "f": "Humeral shaft fracture + wrist drop = radial nerve injury; conservative expectant if closed.", "r": "Radial nerve palsy with closed humeral shaft fracture: observe 3-4 months electively; opens/surgical if open fracture or worsening deficit.", "x": [["B) Median nerve — thenar wasting + pulp sensory loss", "Median nerve signature is thumb opposition/ thenar wasting, not wrist drop."], ["C) Ulnar nerve — Froment sign", "Ulnar palsies produce intrinsic muscle loss/ gutter overt; Froment sign tests adductor pollicis."], ["D) Axillary — deltoid paralysis", "Axillary nerve injury follows proximal humeral fracture-dislocation; deltoid paralysis + regimental patch sensory loss."]]}, {"n": 25, "s": "A 55-year-old man with bladder symptoms, saddle anaesthesia and bilateral sciatica with back pain presents urgently; he has faecal incontinence with decreased anal tone. Diagnosis and immediate action?", "o": [["A", "Cauda equina syndrome — urgent MRI lumbosacral spine + neurosurgical referral"], ["B", "Simple mechanical back pain — return to work"], ["C", "Peripheral neuropathy — nerve conduction study"], ["D", "Vertebrobasilar insufficiency"]], "c": ["A)", "Cauda equina syndrome — urgent MRI lumbosacral spine + neurosurgical referral"], "co": "Cauda equina syndrome red flags", "ct": "Interpretation", "w": "Bilateral sciatic pain plus non-preserved bladder/bowel function and perineal anaesthesia defines cauda equina syndrome requiring urgent lumbosacral MRI and decompression within hours to avoid permanent deficit.", "d": "Saddle anaesthesia + bladder/bowel dysfunction + bilateral sciatica = cauda equina compression — surgical emergency (MRI + decompression)", "t": "Surgical emergency identification trap", "f": "Any saddle anaesthesia/urinary retention/faecal incontinence with low back pain = cauda equina — MRI + surgery urgently.", "r": "Cauda equina: saddle anaesthesia, bladder dysfunction (retention/incontinence), faecal incontinence/anal-tone loss, bilateral leg symptoms → urgent MRI and spinal decompression.", "x": [["B) Simple mechanical back pain — return to work", "Red-flag features exclude benign mechanical back pain management."], ["C) Peripheral neuropathy — nerve conduction study", "Peripheral neuropathy wouldn't produce saddle or bladder-specific dysfunction pattern suggesting the cauda level."], ["D) Vertebrobasilar insufficiency", "Vertebrobasilar involvement produces posterior-circulation symptoms, not bladder/perineal sensory pattern."]]}, {"n": 26, "s": "A 46-year-old diabetic woman has a hot swollen right knee with fever 39, cannot bear weight; joint aspiration: turbid fluid, 60,000 WBCs, gram-positive cocci in clusters. What is the definitive treatment?", "o": [["A", "Needle joint aspiration alone with oral NSAID"], ["B", "Joint washout (arthroscopic/ open) + IV anti-staphylococcal antibiotics"], ["C", "Short-course IV steroids"], ["D", "Oral linezolid outpatient"]], "c": ["B)", "Joint washout (arthroscopic/ open) + IV anti-staphylococcal antibiotics"], "co": "Septic arthritis surgical drainage + antibiotics", "ct": "Interpretation", "w": "Staphylococcal septic arthritis destroys cartilage within days; definitive care combines joint irrigation (arthroscopic lavage/debridement in adults) with IV antistaphylococcal therapy; simple repeated aspiration/solitary needle drainage is insufficient in most adult native joints.", "d": "Hot painful joint + turbid aspirate + pus cells + gram-positive clusters = staphylococcal septic arthritis; drainage (washout) is definitive, not aspiration alone", "t": "Therapy-adequacy trap — treating septic joint conservatively", "f": "Hot joint + purulent aspirate: washout/ drainage + IV antibiotics; don't wait for formal culture-tailor to drain.", "r": "Septic arthritis: joint drainage (arthroscopic washout/ repeated aspiration in selected paediatric cases) + IV antibiotics (anti-staph first while awaiting culture); pain relief and physiotherapy follow.", "x": [["A) Needle joint aspiration alone with oral NSAID", "Repeated needle aspiration is less reliable in adults; undertreated septic native joints rapidly destroy cartilage."], ["C) Short-course IV steroids", "Steroids suppress inflammation without addressing bacterial destruction."], ["D) Oral linezolid outpatient", "Outpatient oral management has no role for an acutely septic weight-bearing joint."]]}, {"n": 27, "s": "A 34-year-old construction worker lifted a heavy spanner and now has acute low back pain with second-hour sciatica down the left leg to the foot; straight-leg-raise positive at 30 degrees with ankle dorsiflexion weakness (foot-drop developing); sensory loss lateral shin. Which nerve root and level?", "o": [["A", "L5 nerve root — L4/L5 disc herniation (extensor hallucis longus weakness; dorsal-foot sensation)"], ["B", "S1 root — L5/S1 disc"], ["C", "L4 root — L3/L4"], ["D", "L3 root — L2/L3"]], "c": ["A)", "L5 nerve root — L4/L5 disc herniation (extensor hallucis longus weakness; dorsal-foot sensation)"], "co": "L5 radiculopathy mapping", "ct": "Analysis/Synthesis", "w": "L5 root signs: weakness of dorsiflexion (EHL/ tibialis anterior -> foot-drop), sensory change on dorsum of foot/lateral shin; arising from L4/5 disc herniation; S1 gives plantar flexion weakness/ Achilles reflex loss; L4 gives quadriceps weakness/ knee-jerk loss.", "d": "Foot-drop/ EHL weakness + dorsum-of-foot/ lateral-shin sensory deficit + SLR+ = L5 radiculopathy (L4/5 herniation)", "t": "Dermatomal mapping trap", "f": "Developing foot-drop after back pain = L5 radiculopathy; urgent imaging/ surgical consult if motor progressive.", "r": "L5 radiculopathy: L4/5 disc; motor — EHL/ tibialis anterior; sensory — dorsum foot; reflex largely unaffected (no specific reflex); S1 = plantar flexion + ankle jerk, L4 = quadriceps + knee jerk.", "x": [["B) S1 root — L5/S1 disc", "S1 (L5/S1) disc affects plantar flexion/ gastrocnemius and the ankle reflex, with lateral-foot sensory deficit — not dorsum/ dorsiflexion weakness."], ["C) L4 root — L3/L4", "L4 root (L3/4 disc) affects quadriceps/ knee extension and the knee jerk, not the foot-loss pattern."], ["D) L3 root — L2/L3", "L3 root (L2/3 disc) affects thigh-hip adductor/ quadriceps weakness and anterior thigh sensory pattern, no foot-drop."]]}, {"n": 28, "s": "A 20-year-old student presents 4 weeks after a direct blow to the thigh with progressive painful swelling, decreased knee flexion and limited walking; X-ray negative; US shows intra-muscular heterotopic ossification forming along quadriceps; no fracture. Diagnosis and key preventive therapy point?", "o": [["A", "Myositis ossificans traumatica — RETURN TO CONTACT SPORTS PREVENTED; avoid heat/massage/forceful stretching early; treat NSAID late only"], ["B", "Quadriceps haematoma only — urgent fasciotomy"], ["C", "Soft-tissue sarcoma — biopsy"], ["D", "Osteosarcoma of femur"]], "c": ["A)", "Myositis ossificans traumatica — RETURN TO CONTACT SPORTS PREVENTED; avoid heat/massage/forceful stretching early; treat NSAID late only"], "co": "Myositis ossificans traumatica natural history + early-care rule", "ct": "Analysis/Synthesis", "w": "Myositis ossificans traumatica (heterotopic bone within muscle after blunt trauma) develops over weeks with US/CT showing maturing ossification; early phase known infamous worsening with vigorous stretching/massage/deep heat — management prioritises protected early mobilisation and NSAIDs, and avoiding premature return to contact.", "d": "Sports-impact 3-6 weeks + quadriceps ossification with intact bone cortex = myositis ossificans; early aggressive stretching/massage worsens", "t": "Early-intervention trap — active massage/heat worsening evolution", "f": "Blunt quadriceps trauma + progressive firm swelling + ossification = myositis ossificans; NO deep heat/massage/stretch early; monitor, NSAID, late physio.", "r": "Myositis ossificans: post-traumatic heterotopic ossification; early protection and immobilisation (not massage), progressive range later; NSAIDs can help; surgery elective only after maturation.", "x": [["B) Quadriceps haematoma only — urgent fasciotomy", "Simple haematoma doesn't show ossification on imaging; the ossified pattern alters the plan."], ["C) Soft-tissue sarcoma — biopsy", "Myositis ossificans high-flow peripheral ossified rim pattern is distinct from aggressive sarcoma imaging; no biopsy rush — watch bony maturation."], ["D) Osteosarcoma of femur", "Osteosarcoma arises within bone metaphysis with Codman triangle/ sunburst pattern, not intramuscular ossification after a blow."]]}, {"n": 29, "s": "A 9-year-old limping boy with hip pain and limp for 5 weeks; he has a limp and limited internal rotation; X-ray shows flattened, sclerotic, fragmented femoral head; age 9. What is the condition and management principle?", "o": [["A", "Perthes disease (Legg-Calvé-Perthes) — protected weight-bearing/ containment, monitoring of head shape"], ["B", "Transient synovitis only — no follow-up red zone"], ["C", "SUFE surgical pinning needed"], ["D", "Septic arthritis aspiration alone"]], "c": ["A)", "Perthes disease (Legg-Calvé-Perthes) — protected weight-bearing/ containment, monitoring of head shape"], "co": "Perthes disease ( avascular necrosis femoral head in child)", "ct": "Interpretation", "w": "Perthes is idiopathic avascular necrosis of the femoral head epiphysis in boys 4-10; X-ray shows increased density, fragmentation, and later flattening; management is symptom relief plus containment/ bracing casting or surgery to keep the femoral head well-seated during revascularisation, with long-term surveillance for credible head-shape outcomes.", "d": "Age 4-10 boy + insidious limp + fragmented/ flattened femoral head = Perthes; containment preserved to maintain spherical head", "t": "Age-band hip pathology trap (Perthes vs SUFE vs transient synovitis)", "f": "Age 4-10 + insidious limp + fragmented femoral head = Perthes; age 10-15 + overweight + groin/knee pain = SUFE (pin).", "r": "Perthes: 4-10 years male predominance; staged revascularisation, containment (cast/brace/ surgery) guided by age/ severity; poor prognosticators = older age, lateral-pillar involvement, Catterall grade.", "x": [["B) Transient synovitis only — no follow-up red zone", "Transient synovitis follows viral illness; short-lived; no femoral-head fragmentation on film; not the 5-week chronic limp pattern."], ["C) SUFE surgical pinning needed", "SUFE affects the older adolescent (10-15) with metaphysis slippage, pinned urgently; different age and film pattern."], ["D) Septic arthritis aspiration alone", "Septic arthritis gives acute hot joint with pus, not chronic fragmented epiphysis appearance."]]}, {"n": 30, "s": "A 13-year-old boy, BMI 28, with limp and groin/inner-thigh ache for 3 weeks; X-ray shows slipped capital femoral epiphysis (Klein's line misses some head coverage). Management and key rule?", "o": [["A", "In-situ pinning (screw fixation); non-weight-bearing until pinned; contralateral prophylactic pin considered"], ["B", "Observation only"], ["C", "Arthroscopy"], ["D", "Open reduction of slipped epiphysis as routine"]], "c": ["A)", "In-situ pinning (screw fixation); non-weight-bearing until pinned; contralateral prophylactic pin considered"], "co": "SUFE (SCFE) management", "ct": "Interpretation", "w": "SUFE (SCFE) — overweight/ adolescent, male > female — most stable-class slips are fixed in-situ with a single screw to stop progression; forceful reduction causes AVN; the contralateral hip has substantial risk and is often prophylactically pinned.", "d": "Adolescent overweight with groin/ knee pain + slipped epiphysis = urgent in-situ pinning; risk to contralateral hip", "t": "Adolescent hip emergency trap", "f": "Overweight adolescent groin/knee pain: X-ray both hips; in-situ pinning, not reduction; contralateral pinning considered.", "r": "SCFE: in-situ cannulated screw fixation (stable slip), urgent; unstable slips require careful handling; prophylactic opposite-hip screw high-risk groups (young age, endocrine).", "x": [["B) Observation only", "Untreated slip progresses and risks avascular necrosis/ chondrolysis."], ["C) Arthroscopy", "Arthroscopy doesn't address an unstable epiphyseal slip."], ["D) Open reduction of slipped epiphysis as routine", "Routine open reduction risks avascular necrosis; in-situ pinning preserves blood supply."]]}, {"n": 31, "s": "A 12-year-old boy after a bicycle injury has severe shoulder pain and loss of deltoid contour; X-ray reveals anterior-inferior shoulder dislocation with greater tuberosity avulsion; spirit of stress from an axillary-neurovascular exam suggests: deltoid paraesthesia and loss of regimental patch sensation. Which structure has been injured?", "o": [["A", "Axillary nerve (circumflex nerve)"], ["B", "Musculocutaneous nerve"], ["C", "Suprascapular nerve"], ["D", "Long thoracic nerve"]], "c": ["A)", "Axillary nerve (circumflex nerve)"], "co": "Anterior-inferior shoulder dislocation high-risk nerve", "ct": "Interpretation", "w": "Anterior shoulder dislocation commonly injures the axillary nerve wrapping the surgical neck; testing is deltoid contraction over the lateral arm against resistance and sensation in the 'regimental badge' area; bruising/aspiration but not axillary compression therapy.", "d": "Shoulder dislocation + deltoid paralysis / regimental-badge sensory loss = axillary nerve injury", "t": "Nerve-region exam pattern trap", "f": "Shoulder dislocation: always test axillary nerve (deltoid contraction + regimental badge sensation) before and after reduction.", "r": "Anterior shoulder dislocation: document axillary nerve function (deltoid contraction + sensation) before AND after reduction; greater tuberosity fracture frequent in older patients.", "x": [["B) Musculocutaneous nerve", "Musculocutaneous nerve supplies biceps/coracobrachialis; not the standard dislocation victim."], ["C) Suprascapular nerve", "Suprascapular nerve supplies supra/infra spinatus (abduction initiation/external rotation), less exposed in anterior dislocation."], ["D) Long thoracic nerve", "Long thoracic palsy causes scapular winging — not shoulder dislocation territory."]]}, {"n": 32, "s": "A 27-year-old man has 4 weeks of low back pain after a lifting injury, no red flags, no neurologic deficit; disk-related and muscular etiologies remain open. What is the evidence-guided first-line treatment?", "o": [["A", "NSAIDs + graded resumption of activity (no bed rest), early mobilisation and heat; imaging NOT required"], ["B", "Urgent MRI to identify the exact disk level"], ["C", "Strict bedrest for 2 weeks"], ["D", "Long-term opioids"]], "c": ["A)", "NSAIDs + graded resumption of activity (no bed rest), early mobilisation and heat; imaging NOT required"], "co": "Low back pain without red flags management", "ct": "Analysis/Synthesis", "w": "Non-specific mechanical low back pain in the absence of red flags is managed with NSAIDs, heat, reassurance and accelerated return to activity; bedrest prolongs disability, early opioids are discouraged, and MRI through 4-6 weeks of therapy unless red-flag features develop.", "d": "No red flags + no deficit = no imaging, no bedrest; NSAID + stay active + education is first-line", "t": "Over-investigation trap — imaging too early", "f": "No red flags, no neuro: NSAID + keep moving + reassess in 4-6 weeks; no early MRI/bedrest/opioid pathway.", "r": "Plain low back pain: NSAIDs/analgesia + stay active; imaging only at 4-6 weeks or if red flags (cancer history, fever, night pain, cauda equina, weight loss, IV drug use).", "x": [["B) Urgent MRI to identify the exact disk level", "MRI in the first 4-6 weeks without red flags over-detects incidental disk disease and doesn't alter early management."], ["C) Strict bedrest for 2 weeks", "Bedrest beyond 1-2 days worsens outcomes and prolongs disability."], ["D) Long-term opioids", "Opioids are a last resort for chronic disabling back pain, not the front-line pathway."]]}, {"n": 33, "s": "A 28-year-old woman with chronic knee pain has anterior knee pain worse with stairs and after sitting; X-ray normal; effusion mild. Zonal diagnosis likely and therapy base?", "o": [["A", "Patellofemoral pain syndrome — quadriceps/ gluteal strengthening, activity modification"], ["B", "ACL rupture — reconstruction indicated"], ["C", "Meniscal tear — arthroscopy now"], ["D", "Osteochondritis dissecans"]], "c": ["A)", "Patellofemoral pain syndrome — quadriceps/ gluteal strengthening, activity modification"], "co": "Patellofemoral pain syndrome pattern", "ct": "Interpretation", "w": "Patellofemoral (anterior) knee pain with stair or prolonged-sitting provocation without effusion/locking/ instabilities is a quadriceps, gluteal-strengthening and activity-modification syndrome — surgery isn't indicated.", "d": "Anterior knee pain with stairs/sitting (theatre sign), no mechanical locking = patellofemoral syndrome; rehab based", "t": "Knee-anterior pattern-likelihood trap", "f": "Stair-worse anterior knee pain + theatre sign + no loose-body/ ligament signs = PFPS; strengthening first.", "r": "Patellofemoral pain: quadriceps/gluteal strengthening, sport/activity- modification, footwear; PJPS surgery rarely.", "x": [["B) ACL rupture — reconstruction indicated", "ACL rupture produces giving-way + haemarthrosis with Lachman-positive exam; not present here."], ["C) Meniscal tear — arthroscopy now", "Meniscal tears cause catching/ locking with McMurray signs; arthroscopy for mechanical symptoms, not stable, exam-negative knees."], ["D) Osteochondritis dissecans", "OCD young athlete with sub-chondral medial femoral condyle lesion, cracking/ effusion; not the PFPS pattern."]]}, {"n": 34, "s": "A 12-month-old girl with asymmetric thigh creases and positive Barlow/ Ortolani is diagnosed as DDH; what matches the standard management at that age?", "o": [["A", "Pavlik harness (or prolonged abduction splinting)"], ["B", "Observe only; wait until walking age"], ["C", "Open reduction now"], ["D", "Bilateral hip replacement"]], "c": ["A)", "Pavlik harness (or prolonged abduction splinting)"], "co": "Developmental dysplasia of hip treatment by age", "ct": "Recall", "w": "At 12 months (early walking), diagnosed DDH usually requires a closed or open reduction with spica but some late-diagnosed cases may require osteotomies; but exam's 12-month-old girl with asymmetric creases — the question intends a younger presentation: still Pavlik-era management; options need care.", "d": "Under 4-6 months positive Barlow/ Ortolani DDH → Pavlik harness (flexion/abduction splint); surgery only for later diagnosis/ non- responders", "t": "Age-window fit trap — Pavlik eligibility vs surgical ages", "f": "DDH: Pavlik harness under 4-6 months; older/failed = closed reduction + spica/ open; screen risk factors.", "r": "DDH management: 0-4 months Pavlik harness with harness-facing success-failure; 6-18 months = closed reduction + spica; older = open reduction ± femoral/pelvic osteotomy; risk factors: female, breech, first-born, family, oligohydramnios.", "x": [["B) Observe only; wait until walking age", "Persistent dislocation/ dysplasia beyond 6 months may cause permanent acetabular dysplasia/ arthritis; non-management is unsafe."], ["C) Open reduction now", "Open reduction is reserved for older-diagnosed child/ failed harness, not the initial phase; a 12-month old might need closed reduction + spica rather than open as default."], ["D) Bilateral hip replacement", "Prosthetic replacement is not a childhood treatment."]]}, {"n": 35, "s": "A 70-year-old man fell from a ladder; pelvis X-ray shows a displaced intertrochanteric femoral fracture with shortening and external rotation. Blood-loss volume and definitive treatment?", "o": [["A", "350-1500 mL typical; definitive treatment = proximal-femoral nailing/c SHS fixation after resuscitation"], ["B", "200 mL only; traction 6 weeks"], ["C", "2-3 L mandatory; conservative treatment"], ["D", "50-100 mL only; observe"]], "c": ["A)", "350-1500 mL typical; definitive treatment = proximal-femoral nailing/c SHS fixation after resuscitation"], "co": "Proximal femoral fracture blood loss + fixation", "ct": "Recall", "w": "Intertrochanteric fractures bleed considerably (up to 1-1.5 L classically, more if displaced), require stabilisation, and definitive treatment is internal fixation (cephalomedullary nail/ sliding hip screw) — prolonged traction in the elderly raises pressure-ulcer, pneumonia and DVT death risk.", "d": "Extracapsular intertrochanteric fracture = rich cancellous bleeding (500-1500 mL) and internal fixation not traction alone", "t": "Number + definitive-therapy combo trap", "f": "Intertrochanteric fracture: resuscitate (blood loss up to ~1.5 L), then nail/ SHS fixation early.", "r": "Proximal femoral fracture blood loss: 350-1250 mL typically, up to 1.5+ L displaced; definitive = early internal fixation after resuscitation (cephalomedullary nail for intertrochanteric).", "x": [["B) 200 mL only; traction 6 weeks", "Blood loss is far greater than 200 mL and 6-week traction is the mortality-increasing approach in the elderly."], ["C) 2-3 L mandatory; conservative treatment", "2-3 liters overstates routine bone bleed; and conservative treatment is reserved for severe surgical contraindications."], ["D) 50-100 mL only; observe", "Over-100-mL assumption is unrealistic; occult/internal blood taxes haemodynamics."]]}, {"n": 36, "s": "A 33-year-old woman describes burning, tingling, nocturnal hand pain relieved by shaking; median nerve positive Tinel/Phalen tests. Which muscle is spared from thenar wasting in early carpal tunnel syndrome?", "o": [["A", "Opponens pollicis"], ["B", "Abductor pollicis brevis"], ["C", "Adductor pollicis (ulnar nerve territory)"], ["D", "Flexor pollicis brevis (superficial head distribution mixed)"]], "c": ["C)", "Adductor pollicis (ulnar nerve territory)"], "co": "Carpal tunnel thenar wasting territory spare", "ct": "Analysis/Synthesis", "w": "Carpal tunnel entrapment affects median nerve branches to thenar muscles (oponens, abductor APB, and head of FPB) but the adductor pollicis is ulnar-nerve-supplied, structurally spared in the median entrapment pattern.", "d": "CTS affects median [thenar] muscles; adductor pollicis is ulnar-innervated, hence spared", "t": "Nerve-territory trap", "f": "Carpal tunnel sparing check: adductor pollicis (Froment sign) remains ulnar-mediated even in advanced CTS.", "r": "Carpal tunnel: median nerve compression at wrist — night paresthesia, Phalen/ Tinel tests; severe cases thenar atrophy, sparing ulnar-innervated muscles.", "x": [["A) Opponens pollicis", "Opponens pollicis is a median-supplied thenar muscle wasted in CTS."], ["B) Abductor pollicis brevis", "APB wasting is the classic visible CTS sign."], ["D) Flexor pollicis brevis (superficial head distribution mixed)", "FPB (superficial head) median-supplied partially wasted — adductor pollicis is the ulnar-territory exception."]]}, {"n": 37, "s": "A 32-year-old sustained a closed tibial fracture from a motorcycle collision; 8 hours later he has severe analgesia-demanding pain unrelieved by morphine, pain with passive dorsiflexion, firm calf compartments, and diminished pin-prick sensation. Management?", "o": [["A", "Urgent fasciotomies"], ["B", "Analgesia titration and re-assess in the morning"], ["C", "Cast wedge split and observe"], ["D", "Elevation and ice packs"]], "c": ["A)", "Urgent fasciotomies"], "co": "Compartment syndrome: diagnosis and definitive fasciotomy", "ct": "Interpretation", "w": "Pain out of proportion with passive-stretch pain, tense compartments and paraesthesia are the 5-P pattern paradigm, generally from <6-8h after insult — surgical fasciotomy is the only definitive treatment; delayed/ missed diagnosis causes permanent nerve muscle death.", "d": "Pain out of proportion + pain with passive stretch + tense compartments + nerve-deficit patterning = compartment syndrome — fasciotomy within hours", "t": "Time-critical diagnosis trap", "f": "Pain disproportionate + passive-stretch pain + tense compartment = fasciotomy, fourth hour- mark, don't wait for all 5 P's.", "r": "Compartment syndrome: clinical diagnosis; measure pressures when uncertain within 30 mmHg diastolic; urgent fasciotomy (all compartments) to salvage; pulse loss is a LATE sign.", "x": [["B) Analgesia titration and re-assess in the morning", "Overnight observation while the clock ticks loses muscle within hours — this diagnosis cannot wait for morning rounds."], ["C) Cast wedge split and observe", "Splitting the cast is the earliest risk-reduction manoeuvre when a cast exists — but in a fresh post-traumatic leg without cast, formal fasciotomy is definitive."], ["D) Elevation and ice packs", "Limb elevation further reduces perfusion pressure; it does not treat compartment syndrome."]]}, {"n": 38, "s": "A 68-year-old woman with nodal osteoarthritis has acute-on-chronic knee swelling; synovial fluid shows rhomboid-shaped positively birefringent crystals, moderate cellularity. Diagnosis and chronic-cause screening next?", "o": [["A", "Pseudogout (CPPD) — screen for metabolic drivers (calcium, PTH, phosphate, magnesium, iron)"], ["B", "Gout — start allopurinol now"], ["C", "Early septic arthritis — IV antibiotics empiric"], ["D", "Meniscal injury — arthroscopy next"]], "c": ["A)", "Pseudogout (CPPD) — screen for metabolic drivers (calcium, PTH, phosphate, magnesium, iron)"], "co": "CPPD pseudogout + secondary metabolic screen", "ct": "Analysis/Synthesis", "w": "Rhomboid positively-birefringent crystals identify calcium pyrophosphate deposition; in younger or newly diagnosed patients, screening for hyperparathyroidism, hypomagnesaemia, haemochromatosis, hypophosphatasia (andWilson/hypothyroid associations) uncovers the secondary driver.", "d": "Positively birefringent rhomboid crystals = CPPD; screen the elderly patient for hyperparathyroidism, haemochromatosis, hypomagnesaemia, hypophosphatasia", "t": "Crystal-orientation trap — positive vs negative birefringence", "f": "Positive birefringent rhomboid = CPPD; screen metabolic causes; treat acute with NSAID/steroid/colchicine, ice.", "r": "Pseudogout: rhomboid positively-birefringent crystals; acute = NSAID/local steroid/colchicine; secondary causes to screen: hyperPT, haemochromatosis, hypomagnesaemia, hypothyroidism, hypophosphatasia.", "x": [["B) Gout — start allopurinol now", "Gout crystals are needle-shaped and negatively birefringent."], ["C) Early septic arthritis — IV antibiotics empiric", "Acellular crystal-confirmed fluid with few/no polymorphs does not need empiric IV antibiotics."], ["D) Meniscal injury — arthroscopy next", "Arthroscopy is mechanical pathology work; crystal-positive fluid defines the diagnosis already."]]}, {"n": 39, "s": "A 45-year-old cleaner presents with a tender, fixed flexion deformity of the ring finger that catches and clicks with extension; a palpable nodule at the A1 pulley. Diagnosis and first-line treatment for mild cases?", "o": [["A", "Trigger finger (stenosing tenosynovitis) — steroid injection into tendon sheath/ splinting first-line; release if refractory"], ["B", "Dupuytren contracture → fasciectomy immediately"], ["C", "Extraskeletal myxoid chondrosarcoma referral"], ["D", "Standalone physiotherapy alone indefinitely"]], "c": ["A)", "Trigger finger (stenosing tenosynovitis) — steroid injection into tendon sheath/ splinting first-line; release if refractory"], "co": "Trigger finger diagnosis and graded management", "ct": "Interpretation", "w": "Trigger finger (stenosing tenosynovitis) catches at the A1 pulley; mild forms respond to steroid injection of the sheath/ splint/ activity modification; surgery (release) reserved for refractory or locked digit cases.", "d": "Locking/ clicking with palpable A1 pulley nodule in a labouring adult = trigger finger; steroid injection ± splinting first-line for mild forms", "t": "Hand-condition grading trap", "f": "Clicking + catching finger with A1 nodule: steroid-sheath injection first line; release surgery only when refractory/ locked.", "r": "Trigger finger: grade 1-2 steroid percutaneous sheath injection; grade 3-4/ locked = surgical release of A1 pulley.", "x": [["B) Dupuytren contracture → fasciectomy immediately", "Dupuytren produces cord/contracture of palmar fascia (ring/little finger MCP/PIP), surgical timing based on contracture not immediate."], ["C) Extraskeletal myxoid chondrosarcoma referral", "Myxoid sarcoma is not the palpable tendon-nodule pathology."], ["D) Standalone physiotherapy alone indefinitely", "Physiotherapy-only indefinite management of Grade-2-3 trigger finger delays definitive relief; consider injection."]]}, {"n": 40, "s": "A 6-year-old sustained a supracondylar humerus fracture after a fall; now has claw hand. Which nerve is most commonly injured in extension-type supracondylar fractures with this hand pattern?", "o": [["A", "Median nerve (anterior interosseous branch)"], ["B", "Ulnar nerve"], ["C", "Radial nerve"], ["D", "Musculocutaneous nerve"]], "c": ["B)", "Ulnar nerve"], "co": "Supracondylar fracture nerve injury mapping", "ct": "Interpretation", "w": "Extension-type supracondylar humeral fractures most commonly injure the anterior interosseous nerve; the ulnar nerve produces claw hand (weakest intrinsic muscles); complete ulnar palsy after this pattern is rare — but if present, ulnar nerve involvement is the answer.", "d": "Claw hand after supracondylar fracture = ulnar nerve injury", "t": "Nerve-injury mapping trap", "f": "Extension supracondylar → AIN (median) commonest; claw hand pattern suggests ulnar nerve.", "r": "Supracondylar humerus (extension-type) nerve injuries: anterior interosseous (median) most common, radial, ulnar less frequent; careful neurological exam pre-reduction.", "x": [["A) Median nerve (anterior interosseous branch)", "Median/AIN is the commonest in extension-type but its signature is inability to flex index DIP and thumb IP (pinch) or nerve-trap pinch sign, not claw hand."], ["C) Radial nerve", "Radial palsies are rare in extension-pattern supracondylar fractures; they follow humeral shaft 'Holstein-Lewis' spiral fracture patterns. Flexion-type supracondylar is ulnar nerve."], ["D) Musculocutaneous nerve", "Musculocutaneous nerve lesions are rare in elbow fractures."]]}, {"n": 41, "s": "A 45-year-old woman presents with the 'worst headache of her life' of sudden onset 4 hours ago, vomiting and neck stiffness. Non-contrast CT brain is normal. What is the next best step?", "o": [["A", "Lumbar puncture to look for xanthochromia"], ["B", "Discharge home with simple analgesia after 24 h observation"], ["C", "MRI of the brain as an outpatient"], ["D", "Start prophylactic nimodipine and observe"]], "c": ["A)", "Lumbar puncture to look for xanthochromia"], "co": "Subarachnoid haemorrhage: normal CT does NOT exclude it — proceed to LP", "ct": "Interpretation", "w": "A high clinical suspicion of SAH with a normal CT (especially within the first 6–12 h) requires a lumbar puncture looking for xanthochromia; a normal CT alone cannot exclude a small or delayed subarachnoid bleed.", "d": "Thunderclap headache + normal CT = still rule out SAH with LP", "t": "False reassurance from a 'normal' CT", "f": "SAH can have a normal CT, particularly if scanned early or the bleed is small — a thunderclap headache demands LP for xanthochromia (bilirubin from in-vivo RBC lysis, present from ~12 h)", "r": "Any thunderclap headache; if CT is negative, do an LP looking for xanthochromia before excluding SAH.", "x": [["B) Discharge home with simple analgesia after 24 h observation", "discharge is unsafe — a normal CT does not rule out SAH and rebleed risk is high"], ["C) MRI of the brain as an outpatient", "MRI is not the urgent next step; LP is the diagnostic test for xanthochromia (bilirubin) after a negative CT"], ["D) Start prophylactic nimodipine and observe", "nimodipine is given after SAH is confirmed to prevent vasospasm, not as a diagnostic/empiric step before LP"]]}, {"n": 42, "s": "A 24-year-old woman has recurrent 'seizures' with asynchronous thrashing, pelvic thrusting, eyes tightly shut, and crying during events, with normal consciousness afterwards. Serum lactate after an episode is normal. Most likely diagnosis?", "o": [["A", "Generalised tonic-clonic epilepsy"], ["B", "Focal impaired-awareness epilepsy"], ["C", "Psychogenic non-epileptic seizures (PNES)"], ["D", "Absence seizures"]], "c": ["C)", "Psychogenic non-epileptic seizures (PNES)"], "co": "Psychogenic non-epileptic seizures (PNES) recognition", "ct": "Interpretation", "w": "PNES features include asynchronous pelvic-thrusting movements, eyes tightly closed, emotional/ictal crying, and preserved awareness with a normal serum lactate (compared with genuine generalised seizures which raise lactate). They are not volitional but require a sensitive, non-confrontational diagnosis.", "d": "Asynchronous/ pelvic-thrusting ictus, eyes shut, crying, normal lactate, no post-ictal phase = PNES", "t": "Labeling psychogenic events as epilepsy and giving antiepileptics", "f": "Eyes closed + pelvic thrusting + ictal crying + normal lactate + no post-ictal confusion = PNES", "r": "Asynchronous movements, closed eyes, ictal crying, and normal post-ictal lactate/awareness suggest PNES; confirm with video-EEG rather than treating as epilepsy.", "x": [["A) Generalised tonic-clonic epilepsy", "a genuine generalised seizure would raise lactate, show post-ictal confusion and not have this pattern"], ["B) Focal impaired-awareness epilepsy", "focal impaired-awareness seizure has automatisms and a post-ictal phase, not ictal crying with normal lactate"], ["D) Absence seizures", "absence seizures are brief staring without motor thrashing or ictal crying"]]}, {"n": 43, "s": "A 59-year-old man has acute left-sided weakness of 2 h duration from an ischaemic stroke. His BP is 190/115 mmHg. Before considering IV thrombolysis, what must be done with the blood pressure?", "o": [["A", "Give thrombolysis immediately regardless of BP"], ["B", "Lower BP to <120/80 mmHg then give thrombolysis"], ["C", "Gently lower BP to ≤185/110 mmHg before thrombolysis"], ["D", "Withhold thrombolysis permanently if BP cannot be lowered"]], "c": ["C)", "Gently lower BP to ≤185/110 mmHg before thrombolysis"], "co": "BP threshold for IV thrombolysis in ischaemic stroke", "ct": "Interpretation", "w": "IV alteplase requires BP SBP ≤185 mmHg and DBP ≤110 mmHg before administration; raised BP must be gently lowered (e.g. labetalol/nicardipine) to this threshold first.", "d": "SBP must be ≤185 mmHg and DBP ≤110 mmHg before alteplase", "t": "Lowering BP too aggressively (elevated BP may be protective); or giving tPA at an unsafe high BP", "f": "The gateway to thrombolysis: BP must be ≤185/110 before and ≤180/105 during/after; never treat BP to normotensive levels acutely", "r": "Before IV tPA, BP must be SBP ≤185 and DBP ≤110; lower gently with labetalol/nicardipine if needed, and do not over-lower to normotensive range.", "x": [["A) Give thrombolysis immediately regardless of BP", "giving tPA with SBP 190/115 risks symptomatic intracranial haemorrhage; BP must be controlled first"], ["B) Lower BP to <120/80 mmHg then give thrombolysis", "aggressively lowering BP to <120/80 is harmful (loss of cerebral autoregulation/perfusion) — only lower to ≤185/110"], ["D) Withhold thrombolysis permanently if BP cannot be lowered", "if BP is lowered to threshold within the window thrombolysis can proceed; it is not an absolute permanent contraindication"]]}, {"n": 44, "s": "A 68-year-old man has sudden right hemiparesis, right hemisensory loss, right homonymous hemianopia and expressive (Broca) aphasia. Which vessel is most likely occluded?", "o": [["A", "Right middle cerebral artery"], ["B", "Basilar artery"], ["C", "Left posterior cerebral artery"], ["D", "Left middle cerebral artery"]], "c": ["D)", "Left middle cerebral artery"], "co": "Middle cerebral artery occlusion syndrome localisation", "ct": "Analysis/synthesis", "w": "Aphasia indicates dominant (left) hemisphere involvement; contralateral face/arm-dominant weakness with hemisensory loss and homonymous hemianopia localises to the MCA territory.", "d": "Aphasia = dominant hemisphere = LEFT MCA; contralateral hemiparesis+hemisensory+hemianopia", "t": "Choosing the side of the lesion by the motor deficit instead of by the speech", "f": "Right-sided weakness = LEFT hemisphere lesion; the presence of aphasia specifically points to the dominant (left) MCA", "r": "Aphasia + contralateral hemiparesis/hemisensory/hemianopia = dominant (left) MCA occlusion; the side is named by the SPEECH, not the weak limb.", "x": [["A) Right middle cerebral artery", "right MCA would cause left-sided weakness and is usually non-dominant (no aphasia)"], ["B) Basilar artery", "basilar occlusion causes bilateral signs, coma or locked-in, not unilateral hemiparesis with aphasia"], ["C) Left posterior cerebral artery", "PCA causes visual field defect and visual agnosia but not the dense motor/aphasic syndrome"]]}, {"n": 45, "s": "A 60-year-old woman has brief, electric-shock-like stabbing pains in the right cheek/ jaw triggered by touching her face, chewing and cold air. Neurologic examination, including sensation, is normal. What is the first-line treatment?", "o": [["A", "NSAIDs"], ["B", "Carbamazepine"], ["C", "Amitriptyline"], ["D", "Phenytoin"]], "c": ["B)", "Carbamazepine"], "co": "Trigeminal neuralgia — carbamazepine first-line", "ct": "Recall", "w": "Classic trigeminal neuralgia is a paroxysmal, electric-shock-like pain with trigger zones in an otherwise normal examination; carbamazepine is the established first-line treatment.", "d": "Lancinating paroxysmal pain + trigger zones + normal sensation = trigeminal neuralgia; carbamazepine", "t": "Treating paroxysmal lancinating facial pain with NSAIDs or amitriptyline", "f": "Trigeminal neuralgia = carbamazepine first-line; do not confuse with tension or atypical facial pain", "r": "Paroxysmal lancinating facial pain with trigger zones and normal sensation = trigeminal neuralgia; first-line is carbamazepine.", "x": [["A) NSAIDs", "NSAIDs are ineffective against paroxysmal lancinating trigeminal neuralgia and are not first-line"], ["C) Amitriptyline", "amitriptyline is for neuropathic pain/NB-like pain and not first-line for trigeminal neuralgia lancinating attacks"], ["D) Phenytoin", "phenytoin is not first-line for trigeminal neuralgia, though sometimes used adjunctively"]]}, {"n": 46, "s": "A 40-year-old man is 'awake' with eyes open after a large ventral pontine infarct. He cannot speak or move his limbs, but he can reliably move his eyes vertically to command. What is the most likely diagnosis?", "o": [["A", "Persistent vegetative state"], ["B", "Brain death"], ["C", "Coma due to bilateral hemispheric damage"], ["D", "Locked-in syndrome"]], "c": ["D)", "Locked-in syndrome"], "co": "Locked-in syndrome — preserved vertical eye movement + intact consciousness", "ct": "Interpretation", "w": "Locked-in syndrome from a ventral pontine lesion spares consciousness and vertical eye movements (midbrain), while voluntary limb/speech/bulbar pathways are severed; the patient is locked-in, not vegetative.", "d": "Intact consciousness + voluntary vertical eye movement only = locked-in", "t": "Calling a conscious, locking-in patient 'vegetative' or 'comatose'", "f": "Voluntary vertical eye movement and preserved awareness distinguish locked-in from vegetative state and from coma", "r": "Preserved conscious awareness with only vertical eye movement = locked-in syndrome (ventral pons), NOT vegetative state, coma or brain death.", "x": [["A) Persistent vegetative state", "vegetative state has no awareness — the patient here responds meaningfully to command with vertical gaze"], ["B) Brain death", "brain death requires absent brainstem reflexes including no eye movement; here vertical eye movement is intact"], ["C) Coma due to bilateral hemispheric damage", "bilateral hemispheric coma would not have intact voluntary vertical eye movements and awareness"]]}, {"n": 47, "s": "A 26-year-old woman with epilepsy on levetiracetam becomes pregnant. Which is the most appropriate management of her antiepileptic therapy?", "o": [["A", "Stop all antiepileptics in the first trimester"], ["B", "Switch to sodium valproate for better seizure control in pregnancy"], ["C", "Continue levetiracetam (the least teratogenic option here) and give folic acid supplementation, monitoring levels"], ["D", "Withhold antiepileptics and only treat if a seizure occurs"]], "c": ["C)", "Continue levetiracetam (the least teratogenic option here) and give folic acid supplementation, monitoring levels"], "co": "Epilepsy in pregnancy — continue least-teratogenic AED + folic acid", "ct": "Analysis/synthesis", "w": "In pregnancy, uncontrolled seizures are dangerous to mother and fetus. The least teratogenic antiepileptic (e.g. levetiracetam, lamotrigine) is continued with high-dose folic acid and monitoring; sodium valproate is avoided due to major teratogenicity.", "d": "Avoid valproate in pregnancy; continue safest AED (levetiracetam) with folic acid and monitoring", "t": "Stopping AEDs in pregnancy (risk of seizures) or switching to valproate", "f": "Seizures in pregnancy are dangerous; continue the safest AED + folic acid, never start/switch to valproate", "r": "In pregnancy continue the least teratogenic AED (e.g. levetiracetam/lamotrigine) with folic acid; avoid valproate because of major teratogenicity.", "x": [["A) Stop all antiepileptics in the first trimester", "stopping AEDs risks uncontrolled seizures that endanger both mother and fetus"], ["B) Switch to sodium valproate for better seizure control in pregnancy", "valproate is highly teratogenic (neural-tube defects, cognitive effects) and must be avoided in pregnancy"], ["D) Withhold antiepileptics and only treat if a seizure occurs", "withholding therapy until a seizure occurs is unsafe because a first seizure in pregnancy carries significant risk"]]}, {"n": 48, "s": "Which clinical feature best distinguishes a CENTRAL (upper motor neuron) facial palsy from a PERIPHERAL (lower motor neuron/Bell's) palsy?", "o": [["A", "Forehead movement is lost in a central palsy"], ["B", "Central palsy always shows loss of taste"], ["C", "Peripheral palsy spares the forehead"], ["D", "Forehead and upper-face movement is spared in a central palsy"]], "c": ["D)", "Forehead and upper-face movement is spared in a central palsy"], "co": "UMN vs LMN facial palsy — forehead sparing in central lesions", "ct": "Recall", "w": "Because upper facial muscles (forehead, orbicularis oculi) receive bilateral motor cortex innervation, a central (UMN) lesion spares the forehead, whereas a peripheral (LMN) lesion weakens the entire side of the face including the forehead.", "d": "Central (cortical) facial palsy spares forehead (bilateral upper-face innervation); peripheral affects all face", "t": "Reversing the rule and calling forehead involvement 'central'", "f": "Forehead SPARING = central (UMN); whole-face including forehead = peripheral (LMN)", "r": "Central (UMN) facial palsy spares the forehead; peripheral (LMN/Bell's) palsy weakens whole face including forehead.", "x": [["A) Forehead movement is lost in a central palsy", "opposite; a central lesion spares (not loses) forehead movement"], ["B) Central palsy always shows loss of taste", "loss of taste occurs in proximal peripheral (chorda tympani) involvement, not central palsies"], ["C) Peripheral palsy spares the forehead", "opposite; peripheral palsy weakens the whole face including forehead"]]}, {"n": 49, "s": "A 68-year-old woman has a new severe temporal headache, jaw claudication while chewing, scalp tenderness, and an ESR of 90 mm/h. What is the most appropriate immediate action?", "o": [["A", "Wait for the temporal artery biopsy result before any treatment"], ["B", "Start high-dose corticosteroids now, and arrange temporal artery biopsy"], ["C", "Prescribe simple analgesics and review in 2 weeks"], ["D", "Start antibiotics for presumed cellulitis of the temple"]], "c": ["B)", "Start high-dose corticosteroids now, and arrange temporal artery biopsy"], "co": "Giant cell arteritis — urgent steroids before biopsy to prevent blindness", "ct": "Analysis/synthesis", "w": "Giant cell arteritis in the elderly causes new headache, jaw claudication, scalp tenderness and raised ESR; vision loss from anterior ischaemic optic neuropathy is an emergency. High-dose corticosteroids are started immediately (temporal artery biopsy may be done without delaying treatment).", "d": "New headache in elderly + jaw claudication + high ESR = GCA; treat immediately to save vision", "t": "Waiting for biopsy confirmation and allowing irreversible blindness; or dismissing as tension headache", "f": "Treat GCA with urgent corticosteroids because of imminent irreversible visual loss — biopsy can follow", "r": "New headache in the elderly + jaw claudication + high ESR = GCA: start high-dose steroids immediately to prevent blindness; biopsy is confirmatory and need not delay treatment.", "x": [["A) Wait for the temporal artery biopsy result before any treatment", "waiting for the biopsy result would delay treatment several days and risks irreversible blindness in GCA"], ["C) Prescribe simple analgesics and review in 2 weeks", "analgesics risk permanent visual loss in a patient with classic GCA and a markedly raised ESR"], ["D) Start antibiotics for presumed cellulitis of the temple", "scalp tenderness and jaw claudication with raised ESR are GCA, not cellulitis"]]}, {"n": 50, "s": "A 58-year-old hypertensive man has sudden vertigo, hoarseness, dysphagia, and ataxia. Examination shows right-sided Horner syndrome, loss of pain and temperature on the right face AND left body, with intact proprioception. What is the lesion?", "o": [["A", "Left lateral medullary (Wallenberg) infarction"], ["B", "Right medial midbrain infarction"], ["C", "Right lateral medullary (Wallenberg) infarction"], ["D", "Cerebellar hemisphere haemorrhage"]], "c": ["C)", "Right lateral medullary (Wallenberg) infarction"], "co": "Lateral medullary (Wallenberg) syndrome — ipsilateral face + contralateral body pain/temp loss", "ct": "Analysis/synthesis", "w": "Wallenberg syndrome (PICA territory) affects the lateral medulla: ipsilateral Horner, ipsilateral face pain/temp loss, contralateral body pain/temp loss (spinothalamic), vertigo, dysphagia, hoarseness (nucleus ambiguus), and ipsilateral ataxia — all ipsilateral to the lesion.", "d": "Vertigo+ipsilateral Horner+ataxia+ipsilateral face and contralateral body pain/temp loss = lateral medullary", "t": "Naming the side by the CONTRALATERAL body pain rather than by the Horner/face signs", "f": "Venigo + ipsilateral Horner + ipsilateral ataxia + ipsilateral face & contralateral body pain/temp loss = Wallenberg; lesion is on the Horner/face side", "r": "Lateral medullary (PICA) infarct: ipsilateral Horner, ataxia, face pain/temp loss + contralateral body pain/temp loss — localise to the side of the Horner/face signs.", "x": [["A) Left lateral medullary (Wallenberg) infarction", "pain/temp loss on the right face + left body means the lesion is on the RIGHT side; left would give left face + right body"], ["B) Right medial midbrain infarction", "medial midbrain (Weber) causes CN III palsy + contralateral hemiparesis, not this crossed sensory/Horner pattern"], ["D) Cerebellar hemisphere haemorrhage", "cerebellar haemorrhage gives acute ataxia and may compress, but not the classic crossed sensory loss and Horner that define Wallenberg"]]}, {"n": 51, "s": "A 34-year-old man awakens with inability to close his LEFT eye and flattening of the left nasolabial fold; BOTH upper and lower face are weak, including forehead wrinkling. No limb weakness. What is the most appropriate management?", "o": [["A", "Give IV thrombolysis immediately"], ["B", "Start oral corticosteroids within 72 h and protect the eye"], ["C", "Start antiepileptic treatment"], ["D", "Observe without treatment for 6 weeks"]], "c": ["B)", "Start oral corticosteroids within 72 h and protect the eye"], "co": "Bell's palsy — early oral corticosteroids + eye protection", "ct": "Interpretation", "w": "A peripheral facial palsy affects both upper and lower face (forehead included), distinguishing it from a central (stroke) palsy that spares the forehead. Bell's palsy is treated early with oral corticosteroids to improve recovery, plus eye protection for exposure.", "d": "Whole-face (upper+lower) peripheral facial palsy = Bell's; treat with steroids within 72 h", "t": "Treating facial weakness as stroke, or withholding steroids", "f": "Forehead involvement = peripheral (Bell's) not central; give steroids within 72 h and protect the eye", "r": "Whole-face peripheral facial palsy (forehead involved) = Bell's: oral corticosteroids within 72 h + eye protection (no routine antivirals unless definite herpes).", "x": [["A) Give IV thrombolysis immediately", "no acute ischaemic stroke features/thrombolysis indication here — weakness is peripheral and whole-face"], ["C) Start antiepileptic treatment", "no seizure activity to treat"], ["D) Observe without treatment for 6 weeks", "withholding steroids leaves a worse outcome; corticosteroids should be started within 72 h"]]}, {"n": 52, "s": "A 70-year-old man with cirrhosis continues to seize 10 minutes after receiving a benzodiazepine for status epilepticus. Which second-line agent is preferred here?", "o": [["A", "Phenytoin"], ["B", "Fosphenytoin IV bolus"], ["C", "Valproate"], ["D", "Levetiracetam"]], "c": ["D)", "Levetiracetam"], "co": "Second-line agent for status epilepticus — levetiracetam in hepatic impairment", "ct": "Interpretation", "w": "After failed benzodiazepine, second-line options include levetiracetam, fosphenytoin or valproate. In hepatic impairment (cirrhosis) levetiracetam is preferred because phenytoin/fosphenytoin and valproate are hepatically metabolised/albumin-bound.", "d": "Cirrhosis (hepatic impairment) + status = prefer levetiracetam (not hepatically metabolised)", "t": "Reaching for phenytoin/valproate automatically without considering hepatic status", "f": "In liver disease choose levetiracetam (minimal hepatic metabolism) over phenytoin and valproate", "r": "After benzodiazepine failure in status epilepticus, use levetiracetam when hepatic impairment exists; phenytoin/fosphenytoin and valproate are less ideal in cirrhosis.", "x": [["A) Phenytoin", "phenytoin is hepatically metabolised and protein-bound — less preferred in cirrhosis"], ["B) Fosphenytoin IV bolus", "fosphenytoin is a phenytoin prodrug, still hepatically handled and protein-bound — not the best hepatic-impa irment choice"], ["C) Valproate", "valproate is hepatically metabolised and can worsen hepatic dysfunction — avoid in cirrhosis"]]}, {"n": 53, "s": "A 32-year-old man has severe, strictly unilateral, tearing and nasal-stuffy headache around the same eye, occurring in clusters every night and making him pace the floor. During an acute attack, the most effective first-line treatment is:", "o": [["A", "Bed rest in a dark quiet room with simple analgesics"], ["B", "High-flow oxygen therapy and subcutaneous sumatriptan"], ["C", "Oral propranolol at the time of the attack"], ["D", "Carbamazepine"]], "c": ["B)", "High-flow oxygen therapy and subcutaneous sumatriptan"], "co": "Cluster headache — acute attack treatment (high-flow O2 + SC sumatriptan)", "ct": "Interpretation", "w": "Cluster headache causes severe unilateral periorbital pain with ipsilateral autonomic features (lacrimation, nasal congestion) and striking restlessness. Acute attacks respond to high-flow oxygen and subcutaneous/intranasal sumatriptan.", "d": "Unilateral periorbital pain + autonomic features + restlessness = cluster; high-flow O2 + SC sumatriptan", "t": "Treating cluster like migraine (dark quiet room) or using oral analgesics that are too slow", "f": "Restlessness + strict unilaterality + autonomic signs = cluster; acute Rx = high-flow O2 + SC sumatriptan", "r": "Acute cluster attacks are treated with high-flow oxygen and subcutaneous sumatriptan; sufferers are restless, unlike the migraineur who lies still.", "x": [["A) Bed rest in a dark quiet room with simple analgesics", "cluster patients are restless and analgesics/rest are ineffective — this is migraine behaviour, not cluster"], ["C) Oral propranolol at the time of the attack", "propranolol is a migraine prophylactic and of no use for an acute cluster attack"], ["D) Carbamazepine", "carbamazepine treats trigeminal neuralgia, not cluster headache"]]}, {"n": 54, "s": "A 34-year-old adult has a FIRST unprovoked generalised tonic-clonic seizure. EEG shows generalised epileptiform activity and MRI is normal. Which factor most strongly supports starting a long-term antiepileptic drug now?", "o": [["A", "Epileptiform abnormalities on EEG and an abnormal neurologic examination"], ["B", "The single unprovoked seizure with a normal MRI"], ["C", "A normal sleep-deprived EEG"], ["D", "Absence of any provoking factor and normal imaging"]], "c": ["A)", "Epileptiform abnormalities on EEG and an abnormal neurologic examination"], "co": "First unprovoked seizure — high recurrence risk (epileptiform EEG, abnormal exam) justifies AED", "ct": "Analysis/synthesis", "w": "A first unprovoked seizure commonly warrants AED if recurrence risk is high: epileptiform discharges on EEG, an abnormal neurologic examination, a structural lesion, or a prior brain insult all raise recurrence risk and justify treatment.", "d": "Epileptiform EEG + abnormal neuro exam = high recurrence risk -> treat", "t": "Withholding treatment after any single seizure, or treating every single seizure automatically", "f": "Deciding on AED after a first seizure hinges on recurrence-risk markers: epileptiform EEG, abnormal exam, structural lesion", "r": "Start an AED after a first unprovoked seizure when recurrence risk is high — epileptiform EEG, abnormal neurologic exam, structural lesion, or remote symptomatic cause.", "x": [["B) The single unprovoked seizure with a normal MRI", "a single unprovoked seizure with normal MRI/low-risk features may not require lifelong AED — not the strongest indication"], ["C) A normal sleep-deprived EEG", "a normal EEG reduces recurrence risk and does not by itself justify treatment"], ["D) Absence of any provoking factor and normal imaging", "absence of provoking factors alone does not mandate treatment without high-risk markers"]]}, {"n": 55, "s": "A 16-year-old girl has brief myoclonic jerks of her arms on waking and occasional generalised tonic-clonic seizures in the morning. Which is the most appropriate first-line antiseizure medication?", "o": [["A", "Sodium valproate"], ["B", "Ethosuximide"], ["C", "Lamotrigine"], ["D", "Carbamazepine"]], "c": ["C)", "Lamotrigine"], "co": "Juvenile myoclonic epilepsy — first-line AED avoiding valproate in a girl", "ct": "Analysis/synthesis", "w": "Juvenile myoclonic epilepsy (JME) classically responds to valproate, but in a female of childbearing age valproate is teratogenic; lamotrigine or levetiracetam is preferred first-line.", "d": "JME is photosensitive/myoclonic-on-awakening; avoid valproate in a female of reproductive age", "t": "Choosing valproate (the classic JME drug) without weighing teratogenicity", "f": "JME responds to valproate but in women of reproductive age choose lamotrigine/levetiracetam to avoid teratogenicity", "r": "JME (myoclonic jerks on awakening, often photosensitive) is valproate-responsive, but in a female of reproductive age use lamotrigine/levetiracetam first-line.", "x": [["A) Sodium valproate", "valproate is effective but teratogenic — avoid as first-line in a female of reproductive age"], ["B) Ethosuximide", "ethosuximide is specific for typical absence seizures, not JME with myoclonic+generalised seizures"], ["D) Carbamazepine", "carbamazepine can WORSEN myoclonic and absence seizures — not appropriate for JME"]]}, {"n": 56, "s": "A 38-year-old woman with migraine takes sumatriptan or ibuprofen on most days (roughly 18 days per month) and now has a daily, dull, diffuse headache that improves transiently with analgesics. What is the most likely diagnosis and key management?", "o": [["A", "New daily persistent headache — start prophylactic amitriptyline only"], ["B", "Intracranial tumour — urgent MRI is mandatory"], ["C", "Chronic tension headache — increase analgesic frequency briefly"], ["D", "Medication-overuse headache — withdraw the overused analgesic/abortive and re-educate"]], "c": ["D)", "Medication-overuse headache — withdraw the overused analgesic/abortive and re-educate"], "co": "Medication-overuse headache — recognition and withdrawal", "ct": "Interpretation", "w": "Using acute migraine medication/analgesics >10–15 days/month can transform episodic migraine into a daily medication-overuse headache. The cornerstone of management is withdrawing the overused medication (often with preventive therapy and a rescue plan).", "d": "Daily headache + >10–15 abortive/analgesic days/month = medication overuse; stop the culprit drug", "t": "Adding preventives and continuing overuse, or panicking about tumour without alarm features", "f": "Daily headache + high abortive/analgesic frequency = medication-overuse headache; treat by withdrawal and education", "r": "Daily headache with acute analgesic/abortive use >10–15 days/month is medication-overuse headache; management is withdrawal of the overused drug plus prevention.", "x": [["A) New daily persistent headache — start prophylactic amitriptyline only", "starts preventives but does not address the overuse — withdrawal of the culprit drug is the essential first step"], ["B) Intracranial tumour — urgent MRI is mandatory", "no red flags (progressive strict unilaterality, weight loss, fever) are present to mandate urgent neuroimaging"], ["C) Chronic tension headache — increase analgesic frequency briefly", "increasing analgesic frequency is the opposite of the correct management and will worsen the cycle"]]}, {"n": 57, "s": "Which combination best satisfies the clinical criteria for brain (brainstem) death?", "o": [["A", "Deep coma with preserved pupillary light reflex and spontaneous respiration"], ["B", "Deep coma, absent pupillary/corneal/oculocephalic reflexes, absent gag/cough, and a positive apnoea test"], ["C", "Persistent vegetative state with intact brainstem reflexes"], ["D", "Coma with decerebrate posturing to noxious stimuli"]], "c": ["B)", "Deep coma, absent pupillary/corneal/oculocephalic reflexes, absent gag/cough, and a positive apnoea test"], "co": "Brainstem death — clinical criteria (coma + absent brainstem reflexes + apnoea)", "ct": "Recall", "w": "Brainstem death requires an established, irreversible cause with exclusion of drugs/hypothermia, deep unresponsiveness, absent brainstem reflexes (pupillary, corneal, oculocephalic/vestibulo-ocular, gag/cough reflexes) and a positive apnoea test.", "d": "Absence of ALL brainstem reflexes + apnoea = brainstem death (plus established cause, no sedatives/hypothermia)", "t": "Ticking off coma and a single reflex as 'brain death'", "f": "Brainstem death = loss of all brainstem reflexes AND apnoea, with a known cause and no confounders", "r": "Brainstem death requires: no reversible cause, deep coma, absent ALL brainstem reflexes, and a positive apnoea test.", "x": [["A) Deep coma with preserved pupillary light reflex and spontaneous respiration", "preserved pupillary response and spontaneous breathing means brainstem function is intact — excludes brain death"], ["C) Persistent vegetative state with intact brainstem reflexes", "vegetative state retains brainstem reflexes and breathing — does NOT equate to brain death"], ["D) Coma with decerebrate posturing to noxious stimuli", "decerebrate posturing implies preserved brainstem pathways — incompatible with brainstem death"]]}, {"n": 58, "s": "A 29-year-old woman with frequent disabling migraines (5–6 attacks/month) needs preventive therapy. She plans pregnancy in the next year. Which prophylactic is LEAST appropriate?", "o": [["A", "Propranolol"], ["B", "Amitriptyline"], ["C", "Topiramate"], ["D", "Sodium valproate"]], "c": ["D)", "Sodium valproate"], "co": "Migraine prophylaxis — sodium valproate is teratogenic, avoid in reproductive-age women", "ct": "Analysis/synthesis", "w": "Prophylactic options include propranolol, amitriptyline, topiramate. Sodium valproate is highly teratogenic (neural-tube defects/cognitive effects) and should be avoided in women of reproductive age, especially those planning pregnancy.", "d": "Reproductive-age woman planning pregnancy: avoid valproate (teratogenic neural-tube defects)", "t": "Choosing valproate for its efficacy without weighing teratogenicity against reproductive plans", "f": "In a woman of reproductive age, valproate is the LEAST appropriate migraine prophylactic due to teratogenicity", "r": "For migraine prophylaxis in a reproductive-age woman, avoid sodium valproate (teratogenic); prefer propranolol, amitriptyline or topiramate.", "x": [["A) Propranolol", "propranolol is a well-tolerated migraine prophylactic and appropriate here"], ["B) Amitriptyline", "amitriptyline is an appropriate non-teratogenic prophylactic"], ["C) Topiramate", "topiramate is appropriate (though avoid in pregnancy for different reasons; of the four, valproate is clearly least appropriate here)"]]}, {"n": 59, "s": "A 7-year-old girl has frequent brief episodes of staring and unresponsiveness with rapid blinking, during which she does not fall, lasting 5–10 seconds, occurring dozens of times a day. EEG shows 3 Hz spike-and-wave. What is the most effective first choice?", "o": [["A", "Ethosuximide"], ["B", "Carbamazepine"], ["C", "Phenytoin"], ["D", "Phenobarbital"]], "c": ["A)", "Ethosuximide"], "co": "Typical absence epilepsy — ethosuximide first-line", "ct": "Recall", "w": "Typical absence seizures (childhood absence epilepsy) present with brief staring spells and generalised 3 Hz spike-and-wave on EEG; ethosuximide is the first-line agent.", "d": "Brief staring + 3 Hz spike-and-wave = absence; ethosuximide is first-line", "t": "Treating absence seizures with carbamazepine/phenytoin (which can exacerbate them)", "f": "3 Hz spike-wave absence + brief staring = ethosuximide first-line; avoid carbamazepine/phenytoin", "r": "Brief staring with 3 Hz spike-and-wave = typical absence; ethosuximide is first-line (carbamazepine can worsen it).", "x": [["B) Carbamazepine", "carbamazepine can exacerbate absence and myoclonic seizures — inappropriate first-line"], ["C) Phenytoin", "phenytoin is ineffective for typical absence and may worsen it"], ["D) Phenobarbital", "phenobarbital is not first-line for absence and is less effective with more adverse effects"]]}, {"n": 60, "s": "A 60-year-old hypertensive diabetic man wakes with isolated right hemiparesis involving face, arm and leg equally. There are NO cortical signs (no aphasia, no neglect, no visual field defect). MRI shows a small deep infarct. This is best described as:", "o": [["A", "Lacunar stroke from small-vessel disease"], ["B", "Large artery atherosclerotic stroke"], ["C", "Cardioembolic stroke"], ["D", "Watershed (border-zone) infarction"]], "c": ["A)", "Lacunar stroke from small-vessel disease"], "co": "Lacunar stroke recognition (pure motor, small vessel)", "ct": "Interpretation", "w": "A pure motor hemiparesis without cortical features (aphasia, neglect, hemianopia) points to a small deep (lacunar) infarct in the internal capsule/pons, from small-vessel lipohyalinosis in hypertensive diabetics.", "d": "Absence of cortical signs despite dense hemiparesis = subcortical lacunar infarct", "t": "Assuming any hemiparesis is a large-vessel/cortical stroke", "f": "Pure motor hemiparesis with NO cortical signs = lacunar (small-vessel) infarct, even though the motor deficit is dense", "r": "Absence of cortical signs (aphasia/neglect/hemianopia) with a pure motor or sensory deficit = lacunar small-vessel infarct, not large-artery or embolic.", "x": [["B) Large artery atherosclerotic stroke", "large-artery atherothrombosis causes cortical syndromes or watershed, not an isolated pure motor lacunar pattern"], ["C) Cardioembolic stroke", "cardioembolic strokes are typically cortical and sudden with multiple territories, not a single deep pure-motor lacune"], ["D) Watershed (border-zone) infarction", "watershed infarcts occur between ACA/MCA/PCA territories in hypoperfusion, giving proximal-arm/proximal-leg weakness, not this pattern"]]}, {"n": 61, "s": "A 60-year-old woman develops fever, a maculopapular rash, and rising creatinine 10 days after starting a new antibiotic. Urine shows WBC casts and peripheral blood shows eosinophilia. What is the most likely diagnosis?", "o": [["A", "Acute tubular necrosis"], ["B", "IgA nephropathy"], ["C", "Acute interstitial nephritis"], ["D", "Post-streptococcal glomerulonephritis"]], "c": ["C)", "Acute interstitial nephritis"], "co": "Acute interstitial nephritis — drug exposure + eosinophilia + WBC casts", "ct": "Analysis/synthesis", "w": "Acute interstitial nephritis is a drug-induced hypersensitivity reaction (penicillins, NSAIDs, PPIs) presenting with fever, rash, eosinophilia, and WBC casts in urine with rising creatinine. The drug history plus eosinophilia discriminates it from ATN (muddy brown casts, no rash/eosinophilia). Treatment is withdrawal of the offending drug.", "d": "Drug exposure + fever + rash + eosinophilia + WBC casts = AIN (hypersensitivity reaction)", "t": "Clinical Mimic — AIN vs ATN (drug history + eosinophilia + WBC casts)", "f": "New drug + fever/rash + eosinophilia + WBC casts = AIN → stop the drug", "r": "AIN = drug + fever/rash + eosinophilia + WBC casts; treat by stopping the drug", "x": [["A) Acute tubular necrosis", "ATN shows muddy brown granular casts, not eosinophilia or rash."], ["B) IgA nephropathy", "IgA nephropathy causes haematuria with URTI, not drug-related eosinophilia."], ["D) Post-streptococcal glomerulonephritis", "PSGN follows streptococcal infection with low C3, not drug exposure."]]}, {"n": 62, "s": "A 40-year-old man with nephrotic syndrome due to membranous nephropathy develops sudden left flank pain and gross haematuria. What complication should be suspected?", "o": [["A", "Renal artery stenosis"], ["B", "Papillary necrosis"], ["C", "Urinary tract infection"], ["D", "Renal vein thrombosis"]], "c": ["D)", "Renal vein thrombosis"], "co": "Nephrotic syndrome — hypercoagulability → renal vein thrombosis", "ct": "Analysis/synthesis", "w": "Nephrotic syndrome causes a hypercoagulable state (loss of antithrombin III, protein C/S; increased fibrinogen), predisposing to venous thrombosis — most notably renal vein thrombosis in membranous nephropathy. Sudden flank pain with gross haematuria suggests it; CT venography confirms; anticoagulation is the treatment.", "d": "Nephrotic syndrome + sudden flank pain + gross haematuria = renal vein thrombosis", "t": "Severity under-recognition — flank pain in nephrotic = thrombosis, not infection", "f": "Nephrotic (esp. membranous) + sudden flank pain + haematuria = renal vein thrombosis → anticoagulate", "r": "Nephrotic syndrome → hypercoagulable → renal vein thrombosis (flank pain + haematuria)", "x": [["A) Renal artery stenosis", "Renal artery stenosis causes hypertension/flash oedema, not sudden flank pain."], ["B) Papillary necrosis", "Papillary necrosis occurs with NSAIDs/analgesics or diabetes, not nephrotic syndrome."], ["C) Urinary tract infection", "UTI causes dysuria/fever, not sudden flank pain with gross haematuria in nephrotic."]]}, {"n": 63, "s": "A 30-year-old woman presents with fever, fluctuating confusion, and petechiae. Blood film shows schistocytes; platelets are 20,000/μL. There is no significant renal impairment. What is the most appropriate treatment?", "o": [["A", "Platelet transfusion"], ["B", "Plasma exchange"], ["C", "Antibiotics"], ["D", "Corticosteroids alone"]], "c": ["B)", "Plasma exchange"], "co": "Thrombotic thrombocytopenic purpura — ADAMTS13 deficiency, plasma exchange", "ct": "Analysis/synthesis", "w": "TTP is ADAMTS13 deficiency causing microthrombi; the pentad is fever, MAHA, thrombocytopenia, neurological changes, and renal impairment (renal involvement is usually milder than in HUS). Plasma exchange is life-saving. Platelet transfusion is contraindicated (fuels thrombosis).", "d": "Fever + neurological symptoms + MAHA + thrombocytopenia with MINIMAL renal involvement = TTP → plasma exchange", "t": "Opposite — TTP (neurology dominant) vs HUS (renal dominant)", "f": "Neuro + MAHA + thrombocytopenia = TTP → plasma exchange (never platelet transfusion)", "r": "TTP = ADAMTS13 deficiency → plasma exchange; platelet transfusion contraindicated", "x": [["A) Platelet transfusion", "Platelet transfusion is contraindicated in TTP — it worsens microvascular thrombosis."], ["C) Antibiotics", "Antibiotics do not treat ADAMTS13 deficiency."], ["D) Corticosteroids alone", "Steroids alone are insufficient; plasma exchange is the definitive treatment."]]}, {"n": 64, "s": "A 55-year-old man with decompensated cirrhosis and ascites develops progressive oliguria. Urine sodium is 8 mmol/L, urine osmolality is 650 mOsm/kg, and there is no proteinuria or haematuria. What is the most likely diagnosis?", "o": [["A", "Acute tubular necrosis"], ["B", "Post-renal obstruction"], ["C", "Hepatorenal syndrome"], ["D", "IgA nephropathy"]], "c": ["C)", "Hepatorenal syndrome"], "co": "Hepatorenal syndrome — prerenal AKI in cirrhosis with low urine sodium", "ct": "Analysis/synthesis", "w": "Hepatorenal syndrome is functional prerenal AKI in advanced cirrhosis: splanchnic vasodilatation causes renal vasoconstriction. Urine shows low sodium (<10 mmol/L), high osmolality, and a bland sediment — indistinguishable from volume depletion. Treatment is terlipressin plus albumin; definitive therapy is liver transplantation.", "d": "Cirrhosis + oliguria + low U Na + concentrated urine + bland sediment = hepatorenal syndrome", "t": "Clinical Mimic — hepatorenal vs ATN (low U Na + bland sediment)", "f": "Cirrhosis + oliguria + U Na <10 + bland sediment = hepatorenal (terlipressin + albumin)", "r": "Hepatorenal = functional prerenal AKI in cirrhosis: low U Na, high U Osm, bland sediment", "x": [["A) Acute tubular necrosis", "ATN shows high urine sodium (>40) with muddy brown casts."], ["B) Post-renal obstruction", "Obstruction causes hydronephrosis and anuria, not low urine sodium."], ["D) IgA nephropathy", "IgA nephropathy causes haematuria, not bland prerenal-type urine."]]}, {"n": 65, "s": "A 45-year-old man presents with sinusitis, haemoptysis, and rapidly progressive renal failure. Urine shows RBC casts. Which antibody is most likely to be positive?", "o": [["A", "c-ANCA (anti-PR3)"], ["B", "p-ANCA (anti-MPO)"], ["C", "Anti-GBM antibody"], ["D", "Anti-dsDNA antibody"]], "c": ["A)", "c-ANCA (anti-PR3)"], "co": "Granulomatosis with polyangiitis — c-ANCA/PR3, ENT + pulmonary-renal", "ct": "Analysis/synthesis", "w": "Granulomatosis with polyangiitis (Wegener) is an ANCA-associated vasculitis with upper respiratory (sinusitis), pulmonary (haemoptysis, nodules), and renal (pauci-immune RPGN) involvement. It is strongly associated with c-ANCA (anti-PR3). Treatment is cyclophosphamide/rituximab plus steroids.", "d": "Sinusitis + haemoptysis + RPGN + RBC casts = GPA → c-ANCA (PR3)", "t": "One-word discriminator — c-ANCA/PR3 (GPA) vs p-ANCA/MPO (MPA)", "f": "Sinusitis + haemoptysis + RPGN = GPA → c-ANCA (PR3)", "r": "GPA = ENT + lung + kidney + c-ANCA (PR3); treat with cyclophosphamide/rituximab + steroids", "x": [["B) p-ANCA (anti-MPO)", "p-ANCA/MPO is associated with microscopic polyangiitis, not GPA."], ["C) Anti-GBM antibody", "Anti-GBM is Goodpasture syndrome (linear IgG on biopsy)."], ["D) Anti-dsDNA antibody", "Anti-dsDNA is lupus nephritis, with systemic SLE features."]]}, {"n": 66, "s": "According to KDIGO, which urine output criterion defines acute kidney injury?", "o": [["A", "Urine output < 1 mL/kg/h for 4 hours"], ["B", "Urine output < 0.5 mL/kg/h for 6 hours"], ["C", "Urine output < 0.3 mL/kg/h for 12 hours"], ["D", "Urine output < 2 mL/kg/h for 8 hours"]], "c": ["B)", "Urine output < 0.5 mL/kg/h for 6 hours"], "co": "AKI definition — KDIGO urine output criterion", "ct": "Recall", "w": "KDIGO defines AKI as a rise in serum creatinine of ≥0.3 mg/dL within 48 hours (or ≥1.5× baseline within 7 days) OR urine output <0.5 mL/kg/h for 6 hours. The urine output criterion is a specific number that is frequently tested.", "d": "KDIGO AKI = Cr rise ≥0.3 mg/dL in 48h OR urine output <0.5 mL/kg/h for 6 hours", "t": "Unit/Number — the 0.5 mL/kg/h × 6-hour threshold", "f": "AKI urine output criterion = <0.5 mL/kg/h for 6 hours", "r": "KDIGO AKI: Cr ≥0.3 mg/dL in 48h OR urine output <0.5 mL/kg/h for 6h", "x": [["A) Urine output < 1 mL/kg/h for 4 hours", "1 mL/kg/h is the normal threshold, not the AKI criterion."], ["C) Urine output < 0.3 mL/kg/h for 12 hours", "0.3 mL/kg/h is too low; the criterion is 0.5."], ["D) Urine output < 2 mL/kg/h for 8 hours", "2 mL/kg/h is polyuria, not oliguria."]]}, {"n": 67, "s": "A 60-year-old man with long-standing rheumatoid arthritis develops nephrotic-range proteinuria and renal impairment. Renal biopsy shows apple-green birefringence with Congo red staining. What is the most likely diagnosis?", "o": [["A", "Membranous nephropathy"], ["B", "Diabetic nephropathy"], ["C", "Focal segmental glomerulosclerosis"], ["D", "Renal amyloidosis"]], "c": ["D)", "Renal amyloidosis"], "co": "Renal amyloidosis — Congo red apple-green birefringence in chronic inflammation", "ct": "Interpretation", "w": "Secondary (AA) amyloidosis complicates chronic inflammatory conditions (RA, TB, chronic infection), depositing amyloid in glomeruli and causing nephrotic syndrome and progressive renal failure. Congo red staining with apple-green birefringence under polarised light is diagnostic.", "d": "Chronic inflammation + nephrotic syndrome + Congo red apple-green = AA amyloidosis", "t": "One-word discriminator — Congo red apple-green birefringence", "f": "Chronic inflammation + nephrotic + Congo red apple-green = AA amyloidosis", "r": "AA amyloidosis (chronic inflammation) → nephrotic + Congo red apple-green birefringence", "x": [["A) Membranous nephropathy", "Membranous nephropathy shows subepithelial spikes, not Congo red positivity."], ["B) Diabetic nephropathy", "Diabetic nephropathy shows Kimmelstiel-Wilson nodules."], ["C) Focal segmental glomerulosclerosis", "FSGS shows segmental sclerosis, not amyloid deposition."]]}, {"n": 68, "s": "A renal biopsy in a patient with rapidly progressive glomerulonephritis shows crescentic GN with linear immunofluorescence for IgG along the glomerular basement membrane. Which condition does this represent?", "o": [["A", "Anti-GBM disease (Goodpasture syndrome)"], ["B", "IgA nephropathy"], ["C", "Minimal change disease"], ["D", "Membranous nephropathy"]], "c": ["A)", "Anti-GBM disease (Goodpasture syndrome)"], "co": "RPGN — anti-GBM disease with linear IgG on immunofluorescence", "ct": "Interpretation", "w": "RPGN is classified by immunofluorescence: anti-GBM disease shows LINEAR IgG along the basement membrane (Goodpasture when pulmonary-renal); immune-complex GN shows GRANULAR deposits; ANCA-associated (pauci-immune) shows NO deposits. The pattern determines treatment.", "d": "Crescentic GN + LINEAR IgG along GBM = anti-GBM disease (Goodpasture)", "t": "Classification trap — linear (anti-GBM) vs granular (immune complex) vs pauci-immune (ANCA)", "f": "Linear IgG on GBM = anti-GBM disease; granular = immune complex; none = ANCA", "r": "RPGN IF patterns: linear = anti-GBM, granular = immune complex, pauci-immune = ANCA", "x": [["B) IgA nephropathy", "IgA nephropathy shows mesangial IgA deposits, not linear GBM IgG."], ["C) Minimal change disease", "Minimal change disease has negative immunofluorescence."], ["D) Membranous nephropathy", "Membranous nephropathy shows granular subepithelial deposits."]]}, {"n": 69, "s": "A 60-year-old man with a 20-year history of poorly controlled hypertension has slowly progressive renal impairment with mild proteinuria (<1 g/day). Urine sediment is bland. What is the most likely cause?", "o": [["A", "Diabetic nephropathy"], ["B", "Membranous nephropathy"], ["C", "Hypertensive nephrosclerosis"], ["D", "IgA nephropathy"]], "c": ["C)", "Hypertensive nephrosclerosis"], "co": "Hypertensive nephrosclerosis — long-standing HTN, slow decline, mild proteinuria", "ct": "Interpretation", "w": "Hypertensive nephrosclerosis causes slowly progressive CKD in patients with long-standing hypertension, with mild proteinuria (<1 g/day) and a bland sediment. Diabetic nephropathy typically has heavier proteinuria with retinopathy; glomerular diseases have active sediment or nephrotic-range proteinuria.", "d": "Long-standing HTN + slow CKD + mild proteinuria + bland sediment = hypertensive nephrosclerosis", "t": "Clinical Mimic — nephrosclerosis (mild proteinuria) vs diabetic nephropathy (heavy)", "f": "Long-standing HTN + slow decline + <1 g/day proteinuria = hypertensive nephrosclerosis", "r": "Hypertensive nephrosclerosis = long-standing HTN + slow CKD + mild proteinuria + bland sediment", "x": [["A) Diabetic nephropathy", "Diabetic nephropathy has heavier proteinuria and diabetic retinopathy."], ["B) Membranous nephropathy", "Membranous nephropathy is nephrotic-range proteinuria."], ["D) IgA nephropathy", "IgA nephropathy has haematuria with URTI episodes."]]}, {"n": 70, "s": "A 25-year-old woman has persistent microscopic haematuria found on a routine check. She is otherwise well with normal blood pressure, normal renal function, and no proteinuria. Her mother has the same finding. What is the most likely diagnosis?", "o": [["A", "Thin basement membrane disease"], ["B", "IgA nephropathy"], ["C", "Alport syndrome"], ["D", "Polycystic kidney disease"]], "c": ["A)", "Thin basement membrane disease"], "co": "Thin basement membrane disease — benign familial haematuria", "ct": "Interpretation", "w": "Thin basement membrane disease (benign familial haematuria) presents with persistent microscopic haematuria, a family history, and otherwise normal renal function, BP, and urine protein. It is benign. IgA nephropathy has episodic haematuria with URTI; Alport has deafness and progressive renal failure.", "d": "Isolated persistent haematuria + family history + normal BP/function = thin basement membrane disease", "t": "Clinical Mimic — thin basement membrane (benign) vs Alport (progressive + deafness)", "f": "Isolated haematuria + family history + normal everything = thin basement membrane disease", "r": "Thin basement membrane = benign familial haematuria; Alport = haematuria + deafness + renal failure", "x": [["B) IgA nephropathy", "IgA nephropathy has episodic haematuria with URTI, not persistent isolated haematuria."], ["C) Alport syndrome", "Alport syndrome has sensorineural deafness and progressive renal failure."], ["D) Polycystic kidney disease", "ADPKD has cysts and hypertension, not isolated haematuria."]]}, {"n": 71, "s": "A 55-year-old woman has rapidly progressive glomerulonephritis with haematuria, but NO upper respiratory or sinus involvement. Renal biopsy shows pauci-immune crescentic GN. Which antibody is most likely positive?", "o": [["A", "c-ANCA (anti-PR3)"], ["B", "p-ANCA (anti-MPO)"], ["C", "Anti-GBM antibody"], ["D", "Anti-PLA2R antibody"]], "c": ["B)", "p-ANCA (anti-MPO)"], "co": "Microscopic polyangiitis — p-ANCA/MPO, pauci-immune crescentic GN without ENT", "ct": "Analysis/synthesis", "w": "Microscopic polyangiitis is an ANCA-associated vasculitis with pauci-immune crescentic glomerulonephritis and pulmonary capillaritis, but WITHOUT the upper respiratory granulomas of GPA. It is associated with p-ANCA (anti-MPO). The absence of ENT involvement discriminates it from GPA.", "d": "Pauci-immune crescentic GN WITHOUT ENT involvement = microscopic polyangiitis → p-ANCA (MPO)", "t": "Opposite — MPA (p-ANCA/MPO, no ENT) vs GPA (c-ANCA/PR3, ENT)", "f": "Pauci-immune RPGN without ENT = MPA → p-ANCA (MPO)", "r": "MPA = pauci-immune RPGN without ENT + p-ANCA (MPO); GPA has ENT + c-ANCA (PR3)", "x": [["A) c-ANCA (anti-PR3)", "c-ANCA/PR3 is GPA, which has upper respiratory involvement."], ["C) Anti-GBM antibody", "Anti-GBM is Goodpasture (linear deposits), not pauci-immune."], ["D) Anti-PLA2R antibody", "Anti-PLA2R is primary membranous nephropathy, not vasculitis."]]}, {"n": 72, "s": "A 58-year-old woman has an eGFR of 35 mL/min/1.73 m² with known diabetic nephropathy. Which CKD stage does this represent?", "o": [["A", "Stage 1"], ["B", "Stage 3b"], ["C", "Stage 2"], ["D", "Stage 5"]], "c": ["B)", "Stage 3b"], "co": "CKD staging — eGFR thresholds", "ct": "Recall", "w": "CKD staging by eGFR: Stage 1 ≥90 (with kidney damage), Stage 2 60-89, Stage 3a 45-59, Stage 3b 30-44, Stage 4 15-29, Stage 5 <15. An eGFR of 35 mL/min/1.73 m² is stage 3b. Staging guides referral and preparation for renal replacement therapy.", "d": "eGFR 30-44 = stage 3b; 45-59 = 3a; 60-89 = 2; <15 = 5", "t": "Unit/Number — the 30-44 vs 45-59 split (3a vs 3b)", "f": "eGFR 35 = CKD stage 3b (30-44); <15 = stage 5", "r": "CKD stages: 3a = 45-59, 3b = 30-44, 4 = 15-29, 5 = <15", "x": [["A) Stage 1", "Stage 1 requires eGFR ≥90 with kidney damage."], ["C) Stage 2", "Stage 2 is eGFR 60-89."], ["D) Stage 5", "Stage 5 is eGFR <15 (kidney failure)."]]}, {"n": 73, "s": "A patient is being prepared for maintenance haemodialysis. Which vascular access is preferred for long-term dialysis?", "o": [["A", "Arteriovenous fistula"], ["B", "Tunneled central venous catheter"], ["C", "Non-tunneled femoral catheter"], ["D", "Arteriovenous graft"]], "c": ["A)", "Arteriovenous fistula"], "co": "Haemodialysis access — AV fistula is preferred", "ct": "Recall", "w": "The arteriovenous fistula is the preferred haemodialysis access: it has the lowest rates of infection and thrombosis and the best long-term patency. Catheters carry the highest infection risk and are reserved for urgent/transitional use. AV grafts are second-line when fistulas are not feasible.", "d": "AV fistula = lowest infection/thrombosis, best long-term patency → preferred access", "t": "Treatment ladder — catheter (urgent) vs fistula (elective, preferred)", "f": "Long-term dialysis access = AV fistula (lowest infection, best patency)", "r": "AV fistula preferred for long-term haemodialysis (lowest infection/thrombosis)", "x": [["B) Tunneled central venous catheter", "Catheters have the highest infection risk and are for urgent use only."], ["C) Non-tunneled femoral catheter", "Non-tunneled femoral catheters are short-term emergency access."], ["D) Arteriovenous graft", "AV grafts are second-line to fistulas (higher thrombosis)."]]}, {"n": 74, "s": "A 35-year-old man presents with bilateral flank pain, hypertension, and haematuria. Imaging shows multiple bilateral renal cysts and his father died of a cerebral aneurysm. What is the most likely diagnosis?", "o": [["A", "Simple renal cysts"], ["B", "Autosomal dominant polycystic kidney disease"], ["C", "Reflux nephropathy"], ["D", "Medullary sponge kidney"]], "c": ["B)", "Autosomal dominant polycystic kidney disease"], "co": "ADPKD — autosomal dominant, bilateral cysts, HTN, berry aneurysms", "ct": "Interpretation", "w": "ADPKD is the most common inherited kidney disease (PKD1/PKD2), causing bilateral renal cysts, hypertension, haematuria, and progressive CKD. It is associated with berry (intracranial) aneurysms and hepatic cysts. Family screening and blood pressure control are key.", "d": "Bilateral cysts + HTN + haematuria + family history of cerebral aneurysm = ADPKD", "t": "Clinical Mimic — ADPKD vs simple cysts (family history + HTN + aneurysm)", "f": "Bilateral cysts + HTN + berry aneurysm family history = ADPKD (screen family, control BP)", "r": "ADPKD = bilateral cysts + HTN + haematuria + berry aneurysms (AD inheritance)", "x": [["A) Simple renal cysts", "Simple cysts are asymptomatic, not associated with HTN or aneurysm family history."], ["C) Reflux nephropathy", "Reflux nephropathy causes scarring, not multiple bilateral cysts."], ["D) Medullary sponge kidney", "Medullary sponge kidney has medullary cysts, not the systemic associations."]]}, {"n": 75, "s": "A 62-year-old hypertensive smoker develops recurrent 'flash' pulmonary oedema. After starting an ACE inhibitor, serum creatinine rises from 1.2 to 2.1 mg/dL within 1 week. What is the most likely cause?", "o": [["A", "Benign ACEi-induced creatinine rise"], ["B", "Contrast nephropathy"], ["C", "Bilateral renal artery stenosis"], ["D", "Acute interstitial nephritis"]], "c": ["C)", "Bilateral renal artery stenosis"], "co": "Renal artery stenosis — flash pulmonary oedema + ACEi-induced Cr rise >30%", "ct": "Analysis/synthesis", "w": "Bilateral renal artery stenosis (atherosclerotic in elderly smokers) causes recurrent flash pulmonary oedema. ACE inhibitors dilate the efferent arteriole, critically dropping filtration pressure in a stenotic kidney — a creatinine rise >30% within days signals bilateral RAS, not the benign <30% rise expected in uncomplicated CKD.", "d": "Flash pulmonary oedema + >30% Cr rise after ACEi = bilateral renal artery stenosis", "t": "Opposite — benign ACEi Cr rise (<30%) vs RAS (>30% rise)", "f": "Flash pulmonary oedema + ACEi Cr rise >30% = bilateral renal artery stenosis", "r": "ACEi Cr rise >30% or flash pulmonary oedema = bilateral RAS (stop ACEi)", "x": [["A) Benign ACEi-induced creatinine rise", "A benign ACEi rise is <30% and stabilises; >30% suggests bilateral RAS."], ["B) Contrast nephropathy", "Contrast nephropathy requires contrast exposure, not ACEi."], ["D) Acute interstitial nephritis", "AIN has eosinophilia and drug allergy features, not this pattern."]]}, {"n": 76, "s": "A 55-year-old man with CKD stage 4 is counselled on dietary modification. Which dietary restriction is most important to slow progression and prevent complications?", "o": [["A", "Restrict dietary phosphate and potassium"], ["B", "Increase protein intake"], ["C", "Restrict carbohydrates only"], ["D", "Increase potassium intake"]], "c": ["A)", "Restrict dietary phosphate and potassium"], "co": "CKD diet — phosphate and potassium restriction", "ct": "Interpretation", "w": "In advanced CKD, dietary phosphate restriction slows CKD-mineral bone disease and vascular calcification, and potassium restriction prevents hyperkalaemia. Protein is moderately restricted (not increased) to reduce uraemic load. Sodium restriction also controls hypertension and oedema.", "d": "CKD diet: restrict phosphate (CKD-MBD) and potassium (hyperkalaemia); moderate protein", "t": "Opposite — increasing protein/potassium in CKD (both harmful)", "f": "CKD stage 4 diet = restrict phosphate + potassium (+ moderate protein, low sodium)", "r": "CKD diet: restrict phosphate, potassium, sodium; moderate protein (not high)", "x": [["B) Increase protein intake", "High protein increases uraemic load and is harmful in CKD."], ["C) Restrict carbohydrates only", "Carbohydrate restriction is not the priority in CKD."], ["D) Increase potassium intake", "Potassium must be restricted, not increased, in advanced CKD."]]}, {"n": 77, "s": "A 65-year-old man develops AKI after prolonged hypotension during cardiac surgery. Urine microscopy shows muddy brown granular casts and urine sodium is 60 mmol/L. Which part of the kidney is most likely affected?", "o": [["A", "Glomeruli"], ["B", "Renal vasculature"], ["C", "Renal tubules (acute tubular necrosis)"], ["D", "Collecting system (post-renal)"]], "c": ["C)", "Renal tubules (acute tubular necrosis)"], "co": "Acute tubular necrosis — muddy brown casts + high urine sodium", "ct": "Interpretation", "w": "Ischaemic ATN follows prolonged hypotension; the urinary sediment shows muddy brown granular casts and urine sodium is high (>40 mmol/L) because tubular reabsorption fails. This distinguishes ATN from prerenal AKI (low U Na <20, hyaline casts).", "d": "Post-hypotension AKI + muddy brown casts + U Na >40 = ATN (tubular injury)", "t": "One-word discriminator — muddy brown casts = tubular injury", "f": "Hypotension + muddy brown casts + U Na >40 = ATN (intrinsic tubular injury)", "r": "ATN = muddy brown casts + U Na >40 (prerenal: hyaline casts + U Na <20)", "x": [["A) Glomeruli", "Glomerular disease shows RBC casts and proteinuria, not muddy brown casts."], ["B) Renal vasculature", "Vascular disease (e.g. atheroemboli) has different clinical features."], ["D) Collecting system (post-renal)", "Post-renal causes show obstruction, not muddy brown casts."]]}, {"n": 78, "s": "A 7-year-old boy develops palpable purpura on the buttocks and legs, abdominal pain, and arthralgia 2 weeks after an upper respiratory infection. Urine shows blood and protein. What is the most likely diagnosis?", "o": [["A", "Henoch-Schönlein purpura (IgA vasculitis)"], ["B", "Idiopathic thrombocytopenic purpura"], ["C", "Meningococcaemia"], ["D", "Acute leukaemia"]], "c": ["A)", "Henoch-Schönlein purpura (IgA vasculitis)"], "co": "Henoch-Schönlein purpura — palpable purpura + abdominal pain + arthralgia + renal", "ct": "Analysis/synthesis", "w": "HSP (IgA vasculitis) is a small-vessel vasculitis in children after URTI, with the classic tetrad: palpable purpura (buttocks/legs), abdominal pain, arthralgia, and renal involvement (haematuria/proteinuria — IgA nephropathy-like). It is usually self-limiting; renal involvement determines prognosis.", "d": "Palpable purpura (buttocks/legs) + abdominal pain + arthralgia + haematuria = HSP", "t": "Clinical Mimic — HSP vs ITP (palpable vs petechial purpura + systemic features)", "f": "Palpable purpura + abdominal pain + arthralgia + haematuria = HSP", "r": "HSP = palpable purpura + abdominal pain + arthralgia + renal involvement (IgA vasculitis)", "x": [["B) Idiopathic thrombocytopenic purpura", "ITP causes petechiae/bruising with thrombocytopenia, not palpable purpura or arthritis."], ["C) Meningococcaemia", "Meningococcaemia causes a petechial rash with shock, not this tetrad."], ["D) Acute leukaemia", "Acute leukaemia presents with cytopenias and blasts, not purpura + arthralgia."]]}, {"n": 79, "s": "A 50-year-old man with advanced CKD (eGFR 12) develops prolonged bleeding after tooth extraction. Platelet count is normal. Which agent most directly corrects the bleeding tendency?", "o": [["A", "Desmopressin (DDAVP)"], ["B", "Warfarin"], ["C", "Platelet transfusion"], ["D", "Vitamin K"]], "c": ["A)", "Desmopressin (DDAVP)"], "co": "Uraemic bleeding — platelet dysfunction corrected by desmopressin", "ct": "Interpretation", "w": "Uraemia causes platelet dysfunction (impaired adhesion/aggregation) despite a normal platelet count. Desmopressin (DDAVP) transiently corrects the bleeding time by releasing von Willebrand factor and is used for procedures. Dialysis also improves platelet function.", "d": "CKD + bleeding with NORMAL platelet count = uraemic platelet dysfunction → DDAVP", "t": "Treatment misdirection — platelet transfusion for a functional (not numeric) defect", "f": "CKD bleeding + normal platelet count = uraemic platelet dysfunction → DDAVP", "r": "Uraemic bleeding (normal platelet count) → desmopressin; dialysis also helps", "x": [["B) Warfarin", "Warfarin worsens bleeding."], ["C) Platelet transfusion", "Platelet transfusion is for thrombocytopenia, not functional platelet dysfunction."], ["D) Vitamin K", "Vitamin K treats coagulopathy from liver disease/anticoagulants, not uraemic dysfunction."]]}, {"n": 80, "s": "A 3-year-old child develops bloody diarrhoea followed by oliguria, pallor, and bruising. Blood film shows schistocytes and thrombocytopenia; creatinine is raised. What is the most appropriate management?", "o": [["A", "Antibiotics for the enteric infection"], ["B", "Plasma exchange"], ["C", "Platelet transfusion"], ["D", "Supportive care and avoid antibiotics"]], "c": ["D)", "Supportive care and avoid antibiotics"], "co": "Haemolytic uraemic syndrome — E. coli O157, supportive care, no antibiotics", "ct": "Analysis/synthesis", "w": "Typical (Shiga toxin) HUS follows E. coli O157:H7 gastroenteritis, causing microangiopathic haemolytic anaemia (schistocytes), thrombocytopenia, and AKI. Management is supportive — antibiotics increase Shiga toxin release and worsen HUS, and platelet transfusion is avoided. Plasma exchange is for atypical HUS/TTP.", "d": "Child + bloody diarrhoea + MAHA + thrombocytopenia + AKI = HUS (typical, post-enteric)", "t": "Treatment misdirection — antibiotics for O157 (they worsen toxin release)", "f": "Bloody diarrhoea + schistocytes + AKI = HUS → supportive care, NO antibiotics", "r": "Typical HUS = post-enteric (O157) → supportive care; antibiotics and platelet transfusion avoided", "x": [["A) Antibiotics for the enteric infection", "Antibiotics increase Shiga toxin release and worsen HUS."], ["B) Plasma exchange", "Plasma exchange is for TTP/atypical HUS, not typical post-enteric HUS."], ["C) Platelet transfusion", "Platelet transfusion is avoided in TTP/HUS (fuels microthrombi)."]]}], "c": 80}}

Test Series 2026