{"T5": {"n": 5, "t": "Paediatrics", "d": "Sep 30 2026", "q": [{"n": 1, "s": "A term newborn girl is apneic after initial drying and stimulation. Despite 30 seconds of effective positive-pressure ventilation with a visible chest rise, her heart rate remains below 60 bpm. Chest compressions are started. What compression-to-ventilation ratio should be used?", "o": [["A", "30 compressions to 2 ventilations"], ["B", "15 compressions to 2 ventilations"], ["C", "3 compressions to 1 ventilation"], ["D", "5 compressions to 1 ventilation"]], "c": ["C)", "3 compressions to 1 ventilation"], "co": "Neonatal resuscitation — chest compression:ventilation ratio", "ct": "Recall", "w": "In neonatal resuscitation, once chest compressions are indicated, they are delivered at a 3:1 ratio (90 compressions and 30 ventilations per minute), coordinated so ventilation occurs during the relaxation phase.", "d": "HR < 60 bpm despite effective PPV → chest compressions at a 3:1 ratio with a pause for ventilation", "t": "Unit/Number — adult and child BLS ratios (30:2, 15:2) do not apply to the newborn", "f": "Newborn CPR = 3:1; child 1-rescuer = 30:2; child 2-rescuer = 15:2", "r": "Newborn HR < 60 after effective PPV → 3:1 chest compression:ventilation ratio", "x": [["A) 30 compressions to 2 ventilations", "30:2 is the single-rescuer BLS ratio for children and adults, not the neonatal ratio."], ["B) 15 compressions to 2 ventilations", "15:2 is the two-rescuer BLS ratio for children, not newborns."], ["D) 5 compressions to 1 ventilation", "5:1 is not used in current neonatal or pediatric resuscitation guidelines."]]}, {"n": 2, "s": "A 30-week preterm girl on day 6 of life develops abdominal distension, bilious gastric aspirates, and blood in the stools. Feeds had been advanced rapidly over the previous 72 hours. Abdominal X-ray shows pneumatosis intestinalis. What is the most likely diagnosis and appropriate management?", "o": [["A", "Necrotizing enterocolitis — stop feeds, decompress the stomach, and start intravenous antibiotics"], ["B", "Midgut volvulus — immediate laparotomy"], ["C", "Cows' milk protein intolerance — change to an amino-acid formula"], ["D", "Meconium ileus — hyperosmolar enemas"]], "c": ["A)", "Necrotizing enterocolitis — stop feeds, decompress the stomach, and start intravenous antibiotics"], "co": "Necrotizing enterocolitis — recognition and medical management", "ct": "Interpretation (X-ray finding + management decision)", "w": "Necrotizing enterocolitis, classically triggered by rapid feed advancement in the preterm infant, presents with abdominal distension, bloody stools, and pneumatosis intestinalis on X-ray; initial management is medical: stop feeds, decompress the stomach, and give IV antibiotics.", "d": "Preterm infant + rapid feed advancement + abdominal distension + bloody stools + pneumatosis intestinalis = NEC → bowel rest, gastric decompression, IV antibiotics", "t": "Iatrogenic trap — rapid advancement of feeds is the preventable precipitant of NEC", "f": "Preterm + bloody stool + pneumatosis = NEC; feeds advanced > 20 mL/kg/day predispose", "r": "NEC (preterm, blood per rectum, pneumatosis) → NPO + gastric decompression + IV antibiotics; surgery only for perforation", "x": [["B) Midgut volvulus — immediate laparotomy", "Midgut volvulus presents with bilious vomiting and a sudden, sick infant with a distended, tender abdomen, but pneumatosis intestinalis points to NEC, not volvulus."], ["C) Cows' milk protein intolerance — change to an amino-acid formula", "Cows' milk protein intolerance causes chronic bloody stools and failure to thrive, not an acute abdomen with pneumatosis."], ["D) Meconium ileus — hyperosmolar enemas", "Meconium ileus presents in the first 24–48 hours with failure to pass meconium, typically in cystic fibrosis — not this clinical picture."]]}, {"n": 3, "s": "A 3-week-old boy who is exclusively breastfed has had jaundice since day 10 of life. He is thriving, feeding well, and gaining weight. Total bilirubin is 13.4 mg/dL with a normal direct fraction, and stools are yellow. What is the most appropriate advice?", "o": [["A", "Stop breastfeeding immediately and refer urgently for a Kasai procedure"], ["B", "Reassure and continue breastfeeding, with follow-up; this is breast milk jaundice"], ["C", "Admit for phototherapy and a sepsis workup"], ["D", "Switch to a lactose-free formula permanently"]], "c": ["B)", "Reassure and continue breastfeeding, with follow-up; this is breast milk jaundice"], "co": "Neonatal jaundice — breast milk jaundice (late, unconjugated, healthy infant)", "ct": "Interpretation (bilirubin fractionation + thriving infant)", "w": "Persistent unconjugated jaundice in an otherwise thriving, exclusively breastfed infant of this age is breast milk jaundice, a benign condition; breastfeeding should continue with clinical follow-up.", "d": "Jaundice from day 10 with a NORMAL direct fraction in a thriving breastfed infant = breast milk jaundice → continue breastfeeding", "t": "Clinical Mimic — cholestatic (conjugated) jaundice masquerading as the same yellow discolouration", "f": "Unconjugated + thriving breastfed infant = breast milk jaundice; conjugated + pale stools + dark urine = biliary atresia", "r": "Late unconjugated jaundice in a thriving breastfed infant = breast milk jaundice; continue breastfeeding", "x": [["A) Stop breastfeeding immediately and refer urgently for a Kasai procedure", "Urgent Kasai referral is for biliary atresia, which produces CONJUGATED hyperbilirubinemia with pale stools — absent here."], ["C) Admit for phototherapy and a sepsis workup", "This infant is well and feeding; phototherapy and sepsis workup are not indicated for benign unconjugated jaundice."], ["D) Switch to a lactose-free formula permanently", "Breast milk jaundice does not require stopping breast milk; lactose-free formula is for galactosemia, not this infant."]]}, {"n": 4, "s": "A 6-year-old girl is found to have a murmur during school screening. She is asymptomatic and growing well. On examination there is a soft systolic ejection murmur at the left upper sternal border with a fixed, widely split second heart sound. What is the most likely diagnosis?", "o": [["A", "Ventricular septal defect"], ["B", "Ostium secundum atrial septal defect"], ["C", "Patent ductus arteriosus"], ["D", "Pulmonary stenosis"]], "c": ["B)", "Ostium secundum atrial septal defect"], "co": "Congenital heart disease — ostium secundum ASD auscultation", "ct": "Interpretation (auscultatory pattern — fixed split S2)", "w": "A fixed, widely split second heart sound with a soft pulmonary ejection murmur is the hallmark of an ostium secundum atrial septal defect, the result of a fixed increase in right ventricular volume and prolonged ejection.", "d": "Soft ejection murmur at LUSB + FIXED wide split S2 in an asymptomatic child = ASD (left-to-right atrial shunt)", "t": "Pattern recognition — the fixed split S2 is the discriminating auscultatory sign", "f": "Fixed wide split S2 = ASD; harsh holosystolic LLSB = VSD; continuous machinery = PDA", "r": "Fixed wide split S2 + soft ejection murmur at LUSB = ostium secundum ASD", "x": [["A) Ventricular septal defect", "A VSD produces a harsh holosystolic murmur at the left lower sternal border, not a fixed split S2."], ["C) Patent ductus arteriosus", "A PDA produces a continuous machinery murmur with bounding pulses, usually in infancy."], ["D) Pulmonary stenosis", "Pulmonary stenosis gives an ejection click and a split that widens with inspiration, but it is not fixed."]]}, {"n": 5, "s": "An 8-month-old girl has had fever of 39.5°C for 2 days with no localising source. She is alert and feeding. Urine dipstick shows positive nitrites and leukocyte esterase. What is the most appropriate next step?", "o": [["A", "Start oral antibiotics on the basis of the dipstick alone"], ["B", "Obtain a catheter urine sample for culture, then begin empiric antibiotics"], ["C", "Request a renal ultrasound before any treatment"], ["D", "Observe with antipyretics for another 48 hours"]], "c": ["B)", "Obtain a catheter urine sample for culture, then begin empiric antibiotics"], "co": "Urinary tract infection in children — specimen and culture before treatment", "ct": "Analysis/synthesis (investigation-priority decision in a pre-verbal child)", "w": "In an infant with fever without focus and a positive dipstick, the diagnosis of UTI should be confirmed with a properly collected urine culture (catheter or suprapubic), and empiric antibiotics started; treating on dipstick alone risks unnecessary antibiotics and missed resistance.", "d": "Fever without focus + positive dipstick in a non-toilet-trained infant → confirm with CULTURE (catheter/SPA specimen) then treat; empiric antibiotics may start while awaiting culture", "t": "Investigation hierarchy — culture confirmation before committing to treatment; imaging comes later, not first", "f": "Febrile infant + dirty urine = culture (catheter/SPA) then empiric antibiotics; ultrasound is follow-up, not first", "r": "Suspected infant UTI → catheter urine for culture, then empiric antibiotics; imaging only as follow-up", "x": [["A) Start oral antibiotics on the basis of the dipstick alone", "A dipstick can be falsely positive or negative; culture confirmation is required before treatment in infants."], ["C) Request a renal ultrasound before any treatment", "Imaging (ultrasound/MCUG) is follow-up investigation after a confirmed UTI, not the first diagnostic step."], ["D) Observe with antipyretics for another 48 hours", "Observation without treatment risks progression to pyelonephritis and renal scarring in an infant with a febrile UTI."]]}, {"n": 6, "s": "A term boy born by elective cesarean section without labor develops tachypnea at 2 hours of age: respiratory rate 78/min with mild intercostal retractions and an occasional grunt. Oxygen saturation is 94% on room air. Chest X-ray shows prominent interlobar fissure fluid with streaky perihilar markings. By 36 hours he is much improved. What is the most likely diagnosis?", "o": [["A", "Transient tachypnea of the newborn"], ["B", "Respiratory distress syndrome (surfactant deficiency)"], ["C", "Meconium aspiration syndrome"], ["D", "Congenital pneumonia"]], "c": ["A)", "Transient tachypnea of the newborn"], "co": "Respiratory distress in newborn — transient tachypnea of the newborn (TTN)", "ct": "Interpretation (X-ray pattern + benign course + term C-section context)", "w": "Transient tachypnea of the newborn follows delayed clearance of fetal lung fluid, classically after elective cesarean section; it presents with early tachypnea, resolves within 24–48 hours, and the X-ray shows fluid in the fissures and perihilar streaking.", "d": "Term infant after C-section + tachypnea at 2 hours + fluid in fissures on X-ray + resolution by 36–48 hours = TTN", "t": "Clinical Mimic — same respiratory distress picture as RDS, MAS, and congenital pneumonia", "f": "Term + C-section + resolves in 24–48 h = TTN; preterm + worsening + ground-glass = RDS", "r": "Term C-section infant with early, self-limiting tachypnea and fissure fluid on X-ray = TTN; supportive care only", "x": [["B) Respiratory distress syndrome (surfactant deficiency)", "RDS (surfactant deficiency) occurs in preterm infants with progressive distress, ground-glass X-rays, and worsening course — not this term C-section infant who improves by 36 hours."], ["C) Meconium aspiration syndrome", "Meconium aspiration requires meconium-stained liquor and produces coarse, patchy X-ray opacities with air trapping, not fissure fluid."], ["D) Congenital pneumonia", "Congenital pneumonia is usually accompanied by fever, maternal risk factors, and a sick appearance, not spontaneous improvement by 36 hours."]]}, {"n": 7, "s": "A 2-year-old boy has progressive bowing of the legs and widened wrists since 9 months of age despite routine vitamin D supplementation and adequate sun exposure. Serum calcium is normal, phosphate is very low, alkaline phosphatase is high, and 25-hydroxyvitamin D is normal. His father is short with bowed legs. What is the most appropriate management?", "o": [["A", "A single high-dose bolus of vitamin D (600,000 IU)"], ["B", "Oral phosphate supplements with calcitriol"], ["C", "Intravenous calcium gluconate infusion"], ["D", "Calcitonin injections"]], "c": ["B)", "Oral phosphate supplements with calcitriol"], "co": "Vitamin D-resistant (hypophosphatemic) rickets — diagnosis and treatment", "ct": "Analysis/synthesis (moving beyond the reflex nutritional-rickets answer)", "w": "Rickets that persists despite adequate vitamin D, with a low phosphate but normal calcium and normal 25-hydroxyvitamin D, points to hypophosphatemic (vitamin D-resistant) rickets, a renal phosphate-wasting disorder treated with oral phosphate supplementation plus calcitriol.", "d": "Refractory bowing + NORMAL calcium + very low phosphate + normal 25-OHD + family history = X-linked hypophosphatemic rickets → phosphate replacement with calcitriol", "t": "Overthinking — the reflex 'give more vitamin D' answer is wrong when the biochemistry points to phosphate wasting", "f": "Rickets + normal 25-OHD + low phosphate + positive family history = hypophosphatemic rickets → phosphate + calcitriol", "r": "Hypophosphatemic rickets (normal 25-OHD, low phosphate, refractory bowing) → oral phosphate + calcitriol", "x": [["A) A single high-dose bolus of vitamin D (600,000 IU)", "A further vitamin D bolus is pointless when 25-hydroxyvitamin D is already normal; the problem here is renal phosphate wasting, not vitamin D supply."], ["C) Intravenous calcium gluconate infusion", "Intravenous calcium is for acute hypocalcemia with tetany; this child's serum calcium is normal."], ["D) Calcitonin injections", "Calcitonin lowers calcium and is for hypercalcemia — it has no role in hypophosphatemic rickets."]]}, {"n": 8, "s": "A term newborn boy has not passed meconium in the first 48 hours of life and has progressive abdominal distension with bilious vomiting. Digital rectal examination reveals an empty rectum. Which investigation confirms the diagnosis of Hirschsprung disease?", "o": [["A", "Rectal suction biopsy"], ["B", "Barium enema"], ["C", "Plain abdominal radiograph"], ["D", "Anorectal manometry"]], "c": ["A)", "Rectal suction biopsy"], "co": "Hirschsprung disease — diagnostic gold standard", "ct": "Recall", "w": "Failure to pass meconium within 48 hours with progressive distension and bilious vomiting suggests Hirschsprung disease; the diagnosis is confirmed by rectal suction biopsy demonstrating the absence of ganglion cells.", "d": "Delayed passage of meconium + distension + bilious vomiting + empty rectum = Hirschsprung → diagnosis confirmed by rectal biopsy showing absent ganglion cells", "t": "Investigation hierarchy — barium enema is suggestive, but biopsy is diagnostic", "f": "Hirschsprung = absent ganglion cells on rectal biopsy; barium enema and manometry are supportive only", "r": "Suspected Hirschsprung (delayed meconium + distension) → confirm with rectal biopsy (absent ganglion cells)", "x": [["B) Barium enema", "A barium enema shows a transition zone and is suggestive, but it cannot confirm the absence of ganglion cells."], ["C) Plain abdominal radiograph", "A plain radiograph shows dilated bowel but is non-specific and never diagnostic for Hirschsprung disease."], ["D) Anorectal manometry", "Anorectal manometry aids functional assessment but is not the confirmatory test for aganglionosis."]]}, {"n": 9, "s": "A 7-year-old girl has had a dry, persistent cough for 10 days with low-grade fever but minimal chest findings. Chest X-ray shows bilateral patchy interstitial infiltrates, and cold agglutinins are positive. What is the most appropriate treatment?", "o": [["A", "Oral amoxicillin"], ["B", "Oral azithromycin"], ["C", "Intravenous ceftriaxone"], ["D", "Oral oseltamivir"]], "c": ["B)", "Oral azithromycin"], "co": "Atypical pneumonia — Mycoplasma pneumoniae in school-age children", "ct": "Interpretation/analysis (organism–drug mismatch reasoning)", "w": "Mycoplasma pneumoniae is the classic cause of atypical (walking) pneumonia in school-age children, presenting with a prolonged dry cough and interstitial infiltrates; it lacks a cell wall, so treatment is a macrolide such as azithromycin.", "d": "School-age child + protracted dry cough + patchy interstitial infiltrates + cold agglutinins = Mycoplasma → macrolide (azithromycin) because Mycoplasma lacks a cell wall", "t": "Organism homogeneity — all four options are respiratory pathogens; only the macrolide covers cell-wall-deficient Mycoplasma", "f": "School-age + dry cough > 1 week + interstitial pattern = Mycoplasma → macrolide; β-lactams are ineffective", "r": "Mycoplasma pneumonia (school-age, dry cough, interstitial infiltrates) → azithromycin (macrolide)", "x": [["A) Oral amoxicillin", "Amoxicillin is a β-lactam that acts on the cell wall; Mycoplasma has no cell wall, so it is ineffective."], ["C) Intravenous ceftriaxone", "Ceftriaxone also targets cell-wall synthesis and does not cover Mycoplasma pneumoniae."], ["D) Oral oseltamivir", "Oseltamivir is an antiviral for influenza; this clinical picture is bacterial atypical pneumonia, not flu."]]}, {"n": 10, "s": "A 4-year-old girl from a low-resource setting is assessed for undernutrition. Her height-for-age is below −3 standard deviations, while her weight-for-height is within normal limits and there is no oedema. Which term best classifies this pattern of malnutrition?", "o": [["A", "Stunting (chronic malnutrition)"], ["B", "Wasting (acute malnutrition)"], ["C", "Underweight"], ["D", "Normal nutritional status"]], "c": ["A)", "Stunting (chronic malnutrition)"], "co": "Growth charts and malnutrition classification — stunting vs wasting", "ct": "Recall", "w": "Stunting is chronic malnutrition reflected in a low height-for-age, while wasting is acute malnutrition reflected in a low weight-for-height; this child's pattern — short but not wasted — defines stunting.", "d": "Low height-for-age with normal weight-for-height = stunting (chronic); low weight-for-height = wasting (acute); low weight-for-age = underweight", "t": "Partial Truth — all three labels are malnutrition, but each uses a different anthropometric index", "f": "Stunting = height-for-age (chronic); wasting = weight-for-height (acute); underweight = weight-for-age", "r": "Low height-for-age + normal weight-for-height = stunting (chronic malnutrition)", "x": [["B) Wasting (acute malnutrition)", "Wasting (low weight-for-height) reflects acute malnutrition and is not present here, as weight-for-height is normal."], ["C) Underweight", "Underweight (low weight-for-age) blends both indices; this child's normal weight-for-height means weight-for-age would not be the best classification."], ["D) Normal nutritional status", "Height-for-age below −3 SD is clearly abnormal; this is not normal nutritional status."]]}, {"n": 11, "s": "An 18-month-old boy has fever of 40.1°C, lethargy, and neck stiffness. A petechial rash is spreading rapidly over his trunk, blood pressure is 82/50 mm Hg, and capillary refill is 4 seconds. What is the most appropriate immediate step?", "o": [["A", "Lumbar puncture before antibiotics to confirm the diagnosis"], ["B", "Blood culture and immediate intravenous ceftriaxone"], ["C", "CT head before starting antibiotics"], ["D", "Oral amoxicillin and review in the clinic tomorrow"]], "c": ["B)", "Blood culture and immediate intravenous ceftriaxone"], "co": "Meningitis — meningococcemia recognition and antibiotic timing", "ct": "Analysis/synthesis (immediate action in suspected meningococcemia)", "w": "A febrile child with a rapidly spreading purpuric rash, meningism, and shock has meningococcemia; blood cultures should be drawn and IV ceftriaxone given immediately — lumbar puncture must not delay antibiotics when the child is unstable.", "d": "Fever + petechial/purpuric rash + meningism + shock = meningococcemia → blood culture and IV ceftriaxone IMMEDIATELY; never delay antibiotics for LP in an unstable child", "t": "Priority inversion — LP before antibiotics in an unstable child with a purpuric rash", "f": "Purpuric rash + fever + shock = antibiotics NOW; LP is deferred once the child is stabilised", "r": "Suspected meningococcemia → blood culture + IV ceftriaxone immediately; defer LP if unstable", "x": [["A) Lumbar puncture before antibiotics to confirm the diagnosis", "Performing LP before antibiotics in an unstable child risks herniation and delays life-saving therapy; treat first, LP once stabilised."], ["C) CT head before starting antibiotics", "CT before antibiotics causes unacceptable delay; imaging is only considered for focal signs or raised ICP after stabilisation."], ["D) Oral amoxicillin and review in the clinic tomorrow", "Meningococcemia with shock is a paediatric emergency requiring IV antibiotics and resuscitation, not outpatient care."]]}, {"n": 12, "s": "A 35-week newborn girl at 6 hours of age is lethargic with poor feeding, a heart rate of 175/min, and temperature instability. Her mother had chorioamnionitis with membrane rupture 20 hours before delivery. What is the most appropriate immediate management?", "o": [["A", "Observe for 12–24 hours and reassess before any intervention"], ["B", "Blood culture, lumbar puncture, then start empiric intravenous ampicillin and gentamicin without waiting for results"], ["C", "Start antibiotics only once the blood culture is reported positive"], ["D", "Oral amoxicillin with continued breastfeeding and outpatient review"]], "c": ["B)", "Blood culture, lumbar puncture, then start empiric intravenous ampicillin and gentamicin without waiting for results"], "co": "Neonatal sepsis — early-onset sepsis workup and empiric therapy", "ct": "Analysis/synthesis (workup plus empiric antibiotic decision)", "w": "Neonates with risk factors and clinical signs of early-onset sepsis require a septic workup (blood culture, lumbar puncture) followed by initiation of empiric IV antibiotics (ampicillin plus gentamicin) immediately, without waiting for culture results, because deterioration can be rapid.", "d": "Maternal chorioamnionitis + PROM + neonatal lethargy/tachycardia/temperature instability = suspected early-onset sepsis → cultures and LP THEN immediate empiric IV ampicillin + gentamicin", "t": "Priority inversion — waiting for culture results before treating a sick neonate", "f": "Suspected neonatal sepsis = workup then antibiotics NOW; never wait for culture growth", "r": "Sick neonate with sepsis risk factors → blood culture + LP + immediate empiric IV ampicillin and gentamicin", "x": [["A) Observe for 12–24 hours and reassess before any intervention", "Observation risks rapid deterioration in neonatal sepsis; clinical signs plus major risk factors mandate immediate empiric treatment."], ["C) Start antibiotics only once the blood culture is reported positive", "Delaying antibiotics until the culture is positive is dangerous — mortality rises sharply with delayed therapy in neonates."], ["D) Oral amoxicillin with continued breastfeeding and outpatient review", "Oral antibiotics cannot treat systemic neonatal sepsis; IV therapy in a monitored setting is required."]]}, {"n": 13, "s": "A 15-month-old girl had her first simple febrile seizure two days ago during a febrile illness (39.3°C, generalised tonic-clonic seizure lasting 2 minutes, fully alert afterwards, source found to be acute otitis media). Her mother asks how to prevent another seizure. What is the most appropriate advice?", "o": [["A", "Give paracetamol at the first sign of any fever to prevent seizures"], ["B", "Start daily oral phenobarbital until age 5 years"], ["C", "Control fever for comfort only; antipyretics do not reduce the risk of recurrent febrile seizures"], ["D", "Administer rectal diazepam at the start of every future febrile illness"]], "c": ["C)", "Control fever for comfort only; antipyretics do not reduce the risk of recurrent febrile seizures"], "co": "Febrile seizures — prevention and parental counselling", "ct": "Interpretation (evidence-based counselling after a simple febrile seizure)", "w": "Antipyretics reduce discomfort but do not lower the recurrence risk of febrile seizures, and daily anticonvulsant prophylaxis is not recommended after a simple febrile seizure. Counselling and reassurance are the cornerstone of management.", "d": "Simple febrile seizure → excellent prognosis; antipyretics do NOT prevent recurrence and daily anticonvulsants are not indicated", "t": "What NOT to do — prophylactic antipyretics or daily anticonvulsants for simple febrile seizures", "f": "Simple febrile seizure = reassure; antipyretics for comfort only, no daily prophylaxis", "r": "Simple febrile seizure → reassurance; antipyretics for comfort; no daily anticonvulsant prophylaxis", "x": [["A) Give paracetamol at the first sign of any fever to prevent seizures", "Paracetamol or ibuprofen given at fever onset does not prevent febrile seizure recurrence — an important counselling point."], ["B) Start daily oral phenobarbital until age 5 years", "Daily anticonvulsant prophylaxis is not indicated for simple febrile seizures; it is reserved for selected complex cases."], ["D) Administer rectal diazepam at the start of every future febrile illness", "Intermittent rectal diazepam is only considered in selected high-risk children, not routinely at every febrile illness."]]}, {"n": 14, "s": "A term boy born to a diabetic mother (birth weight 4.3 kg) is noted at 2 hours of age to be jittery and sweaty. Bedside glucose is 30 mg/dL. There is no respiratory distress. What is the most appropriate management?", "o": [["A", "Intravenous bolus of 5% dextrose 2 mL/kg"], ["B", "Intravenous bolus of 10% dextrose 2 mL/kg, then a continuous dextrose infusion"], ["C", "Intravenous bolus of 50% dextrose 1 mL/kg"], ["D", "Oral glucose water and recheck in 2 hours"]], "c": ["B)", "Intravenous bolus of 10% dextrose 2 mL/kg, then a continuous dextrose infusion"], "co": "Neonatal hypoglycaemia — symptomatic infant of diabetic mother", "ct": "Analysis/synthesis (treatment selection for symptomatic hypoglycaemia)", "w": "Symptomatic neonatal hypoglycaemia is treated with an IV bolus of 10% dextrose 2 mL/kg followed by a continuous dextrose infusion; 5% dextrose is too dilute to correct it and 50% dextrose is dangerously hyperosmolar.", "d": "Jitteriness + glucose 30 mg/dL (< 45 mg/dL) in an infant of a diabetic mother = symptomatic hypoglycaemia → IV 10% dextrose 2 mL/kg bolus with ongoing infusion", "t": "Unit/Number — dextrose concentration and volume: D10W 2 mL/kg, not D5W or D50W", "f": "Symptomatic hypoglycaemia (< 45 mg/dL) = D10W 2 mL/kg IV bolus + infusion; D50W is contraindicated in neonates", "r": "Symptomatic neonatal hypoglycaemia → IV 10% dextrose 2 mL/kg bolus followed by continuous infusion", "x": [["A) Intravenous bolus of 5% dextrose 2 mL/kg", "5% dextrose is hypotonic and delivers insufficient glucose to correct symptomatic hypoglycaemia in a newborn."], ["C) Intravenous bolus of 50% dextrose 1 mL/kg", "50% dextrose is hyperosmolar and risks vein injury and rebound hyperglycaemia; it is not used as a neonatal bolus."], ["D) Oral glucose water and recheck in 2 hours", "Oral glucose water is inadequate and unsafe in a symptomatic, jittery infant who needs reliable IV glucose delivery."]]}, {"n": 15, "s": "A term girl is born weighing 1.9 kg (below the 3rd percentile for gestational age). Her mother had severe pre-eclampsia with placental insufficiency. Which complication is this infant at highest risk of developing?", "o": [["A", "Hypoglycaemia"], ["B", "Shoulder dystocia with brachial plexus injury"], ["C", "Surfactant deficiency (respiratory distress syndrome)"], ["D", "Necrotizing enterocolitis after uncomplicated feeding"]], "c": ["A)", "Hypoglycaemia"], "co": "Small for gestational age — metabolic risks", "ct": "Interpretation (risk stratification by intrauterine growth status)", "w": "A term infant who is small for gestational age due to placental insufficiency has depleted glycogen and fat stores and is at highest risk of hypoglycaemia, along with polycythemia and hypothermia — not the complications of prematurity or fetal macrosomia.", "d": "Term + birth weight < 10th percentile + placental insufficiency = SGA → depleted glycogen stores → hypoglycaemia is the classic metabolic risk", "t": "Synonym Swap — SGA (growth restriction) is not the same as preterm, nor the same as LGA", "f": "SGA → hypoglycaemia/polycythemia/hypothermia; LGA/IDM → birth trauma; preterm → RDS", "r": "Term SGA infant with placental insufficiency → monitor for hypoglycaemia, polycythemia, hypothermia", "x": [["B) Shoulder dystocia with brachial plexus injury", "Shoulder dystocia and brachial plexus injury complicate LARGE for gestational age infants, not growth-restricted ones."], ["C) Surfactant deficiency (respiratory distress syndrome)", "Surfactant deficiency (RDS) is a complication of preterm birth; this infant is term and growth-restricted."], ["D) Necrotizing enterocolitis after uncomplicated feeding", "NEC is primarily a disease of prematurity, particularly with aggressive feeding, not a hallmark SGA complication."]]}, {"n": 16, "s": "A 10-month-old boy has had a cough for 3 days. His respiratory rate is 55/min with no chest indrawing and no danger signs; oxygen saturation is 97% and he is feeding well. According to WHO/IMCI classification, what is the most appropriate management?", "o": [["A", "Admit and start intravenous antibiotics for severe pneumonia"], ["B", "Treat at home with oral amoxicillin and advise return if danger signs develop"], ["C", "Give no antibiotics — this is not pneumonia"], ["D", "Refer urgently for very severe disease"]], "c": ["B)", "Treat at home with oral amoxicillin and advise return if danger signs develop"], "co": "Pneumonia in children — IMCI classification (2–12 months)", "ct": "Interpretation (applying IMCI respiratory-rate thresholds)", "w": "For a child aged 2–12 months, a respiratory rate of 50/min or more defines pneumonia (non-severe) when chest indrawing and danger signs are absent; IMCI management is home treatment with oral amoxicillin and follow-up instructions.", "d": "Age 2–12 months + RR ≥ 50/min + no chest indrawing/danger signs = non-severe pneumonia → home treatment with oral amoxicillin", "t": "Guideline Version — the fast-breathing threshold differs by age (≥ 50/min under 12 months, ≥ 40/min at 1–5 years)", "f": "RR ≥ 50 (2–12 mo) or ≥ 40 (1–5 y) + no indrawing/danger signs = non-severe pneumonia → home amoxicillin", "r": "Fast breathing alone (no indrawing, no danger signs) = non-severe pneumonia → oral amoxicillin at home", "x": [["A) Admit and start intravenous antibiotics for severe pneumonia", "Admission with IV antibiotics is for SEVERE pneumonia (chest indrawing) — this child has none."], ["C) Give no antibiotics — this is not pneumonia", "With a respiratory rate of 55/min at 10 months, the IMCI threshold for pneumonia (≥ 50/min) is met, so antibiotics are indicated."], ["D) Refer urgently for very severe disease", "Emergency referral is for very severe disease with danger signs (inability to drink, convulsions, cyanosis) — absent here."]]}, {"n": 17, "s": "A term newborn girl has immediate, severe respiratory distress after birth. On examination the abdomen is scaphoid, and bowel sounds are heard over the left hemithorax. Chest X-ray shows bowel loops in the left chest. What is the key immediate management?", "o": [["A", "Bag-mask ventilation and positioning the infant prone"], ["B", "Orogastric decompression and immediate endotracheal intubation, avoiding bag-mask ventilation"], ["C", "Extracorporeal membrane oxygenation (ECMO) before any other step"], ["D", "Surfactant replacement and nasal CPAP"]], "c": ["B)", "Orogastric decompression and immediate endotracheal intubation, avoiding bag-mask ventilation"], "co": "Congenital diaphragmatic hernia — delivery-room management", "ct": "Analysis/synthesis (immediate life-saving action)", "w": "In congenital diaphragmatic hernia, bag-mask ventilation inflates the bowel within the chest and worsens lung compression; management is immediate endotracheal intubation with orogastric decompression to relieve gas accumulation while avoiding mask ventilation.", "d": "Respiratory distress + scaphoid abdomen + bowel loops in hemithorax = CDH → intubate and decompress the stomach; NEVER bag-mask ventilate", "t": "What NOT to do — mask ventilation, which distends herniated bowel and compounds respiratory failure", "f": "CDH = intubate + orogastric tube; bag-mask ventilation is contraindicated", "r": "Suspected CDH (scaphoid abdomen + bowel in chest) → orogastric decompression + intubation; avoid mask PPV", "x": [["A) Bag-mask ventilation and positioning the infant prone", "Bag-mask ventilation forces air into the herniated bowel, distending it and further compressing the lungs — it is contraindicated."], ["C) Extracorporeal membrane oxygenation (ECMO) before any other step", "ECMO is a rescue therapy considered after stabilization and optimization, not the first step in the delivery room."], ["D) Surfactant replacement and nasal CPAP", "Surfactant and CPAP (mask interface) do not address the visceral herniation; CPAP risks gastric distension."]]}, {"n": 18, "s": "A 3-month-old boy born at 28 weeks gestation with chronic lung disease (still on home oxygen) is about to be discharged in November, before the RSV season begins. Which infant meets criteria for RSV immunoprophylaxis?", "o": [["A", "All infants born before 37 weeks gestation"], ["B", "A preterm infant of 28 weeks with chronic lung disease requiring ongoing oxygen"], ["C", "Any infant attending daycare during winter"], ["D", "Any infant with a school-age sibling"]], "c": ["B)", "A preterm infant of 28 weeks with chronic lung disease requiring ongoing oxygen"], "co": "Bronchiolitis — RSV immunoprophylaxis eligibility", "ct": "Interpretation (applying eligibility criteria to a specific infant)", "w": "RSV immunoprophylaxis is indicated for selected high-risk infants — most prematurity guidelines target infants ≤ 28–29 weeks with chronic lung disease or those with hemodynamically significant congenital heart disease — not for all preterm, daycare, or sibling-exposed infants.", "d": "RSV prophylaxis is reserved for high-risk infants: ≤ 28–29 weeks with chronic lung disease, or hemodynamically significant congenital heart disease — not all preterm or all winter infants", "t": "Guideline Version — the eligibility window is narrow; 'prematurity alone' is insufficient", "f": "RSV prophylaxis = extreme preterm with CLD or significant CHD, within the RSV season; not all preterm infants", "r": "RSV immunoprophylaxis for ≤ 28–29-week preterm infants with chronic lung disease or significant CHD, in RSV season", "x": [["A) All infants born before 37 weeks gestation", "Gestational age alone below 37 weeks is too broad; eligibility is restricted to the most premature infants with additional risk factors."], ["C) Any infant attending daycare during winter", "Daycare attendance increases exposure but is not itself an indication for RSV immunoprophylaxis."], ["D) Any infant with a school-age sibling", "Having a school-age sibling is a risk factor for infection but does not qualify an otherwise healthy infant for prophylaxis."]]}, {"n": 19, "s": "A newborn girl is diagnosed with galactosemia (homozygous deficiency of galactose-1-phosphate uridyltransferase) on newborn screening. Which feeding is contraindicated in this infant?", "o": [["A", "Breast milk"], ["B", "Soy-based formula"], ["C", "Lactose-free formula"], ["D", "Amino-acid based formula"]], "c": ["A)", "Breast milk"], "co": "Breastfeeding — contraindications and infant nutrition", "ct": "Recall", "w": "Breast milk contains lactose, which is broken down to galactose; in galactosemia this cannot be metabolized and causes liver failure, cataracts, and sepsis-like crises. Breast milk and all lactose-containing milks are contraindicated, and a soy-based or lactose-free formula is used.", "d": "Galactosemia → galactose (from lactose in breast milk and cow's milk formula) cannot be metabolized → breast milk is contraindicated; soy/lactose-free formulas are safe", "t": "Negative discrimination — picking the one true contraindication from common maternal/infant worries", "f": "Galactosemia = true contraindication to breast milk; maternal HBV/HIV on treatment are not absolute contraindications", "r": "Galactosemia → avoid breast milk and lactose-containing formulas; use soy-based formula", "x": [["B) Soy-based formula", "Soy-based formula is lactose-free and is the recommended safe alternative in galactosemia."], ["C) Lactose-free formula", "Lactose-free formula is a safe alternative as it contains no galactose precursor."], ["D) Amino-acid based formula", "Amino-acid based formulas are also lactose-free and safe, though usually reserved for protein intolerance."]]}, {"n": 20, "s": "A term newborn girl develops visible jaundice at 18 hours of life. She is feeding well and otherwise vigorous. Her mother is blood group O Rh D-positive and the baby is group B Rh D-positive. What is the most appropriate next step?", "o": [["A", "Reassure the parents that this is physiological jaundice"], ["B", "Evaluate for hemolytic disease with blood group, direct Coombs test, hemoglobin, and reticulocyte count"], ["C", "Proceed directly to exchange transfusion"], ["D", "Start phototherapy and discharge without further testing"]], "c": ["B)", "Evaluate for hemolytic disease with blood group, direct Coombs test, hemoglobin, and reticulocyte count"], "co": "Neonatal jaundice — jaundice in the first 24 hours is pathological", "ct": "Analysis/synthesis (urgency decision for early jaundice)", "w": "Jaundice visible in the first 24 hours of life is always pathological and most commonly reflects hemolysis; the appropriate step is a hemolytic workup (blood group, direct Coombs test, hemoglobin, reticulocyte count) before deciding on treatment.", "d": "Jaundice appearing BEFORE 24 hours of age is never physiological → urgent evaluation for hemolysis (ABO incompatibility) before any treatment", "t": "Opposite — first-24-hour jaundice is the direct opposite of physiological jaundice (day 2–3 onset)", "f": "Jaundice in the first 24 hours = pathological until proven otherwise; physiological onset is day 2–3", "r": "Jaundice before 24 hours of age → investigate for hemolysis; never dismiss as physiological", "x": [["A) Reassure the parents that this is physiological jaundice", "Physiological jaundice never appears in the first 24 hours of life; reassuring here would delay recognition of hemolysis."], ["C) Proceed directly to exchange transfusion", "Exchange transfusion is a treatment reserved for severe hyperbilirubinemia at risk of kernicterus, not the first diagnostic step."], ["D) Start phototherapy and discharge without further testing", "Phototherapy without identifying the cause (e.g., hemolysis) risks missing progressive anemia and a rising bilirubin rebound."]]}, {"n": 21, "s": "A term newborn girl (38 weeks, 3.2 kg) is born after shoulder dystocia with an umbilical cord pH of 6.9 and base deficit of 18 mmol/L. At 4 hours of age she is lethargic, hypotonic, and has subtle seizure activity. What is the most appropriate management?", "o": [["A", "Intravenous phenobarbital alone with supportive care"], ["B", "Therapeutic hypothermia for 72 hours"], ["C", "Exchange transfusion"], ["D", "Deliberate hyperventilation"]], "c": ["B)", "Therapeutic hypothermia for 72 hours"], "co": "Birth asphyxia — hypoxic-ischemic encephalopathy (HIE) and therapeutic hypothermia", "ct": "Analysis/synthesis (neuroprotective management decision)", "w": "A term infant with severe perinatal asphyxia (cord pH 6.9) and clinical encephalopathy within 6 hours meets criteria for therapeutic hypothermia (cooling to 33.5°C for 72 hours), the only intervention proven to reduce death and disability in HIE.", "d": "Perinatal asphyxia (cord pH < 7.0, base deficit ≥ 12) + encephalopathy with seizures at < 6 hours → therapeutic hypothermia improves neurodevelopmental outcome", "t": "Treatment misdirection — seizure control alone without the neuroprotective intervention", "f": "Term ≥ 36 weeks + encephalopathy + onset < 6 hours after asphyxia = consider therapeutic hypothermia", "r": "Severe perinatal asphyxia with encephalopathy at < 6 hours → therapeutic hypothermia for 72 hours", "x": [["A) Intravenous phenobarbital alone with supportive care", "Anticonvulsants treat seizures but do not address the underlying hypoxic-ischemic injury; cooling is the disease-modifying therapy."], ["C) Exchange transfusion", "Exchange transfusion treats severe hemolytic jaundice, not hypoxic-ischemic encephalopathy."], ["D) Deliberate hyperventilation", "Hyperventilation is no longer recommended for HIE and can worsen cerebral perfusion."]]}, {"n": 22, "s": "A 12-month-old boy has passed loose watery stools 6–8 times in the past 24 hours, without blood. He is alert, drinks eagerly, has no sunken eyes, and his skin pinch returns immediately. Per WHO/IMCI classification he has no dehydration. What is the most appropriate management?", "o": [["A", "Continue feeding, give ORS after each loose stool, and give zinc supplements for 14 days"], ["B", "Intravenous Ringer lactate 20 mL/kg bolus"], ["C", "Supervised ORS 75 mL/kg over 4 hours in a treatment room"], ["D", "Loperamide with plain water and no feeds"]], "c": ["A)", "Continue feeding, give ORS after each loose stool, and give zinc supplements for 14 days"], "co": "Acute diarrhoea — WHO/IMCI Plan A (no dehydration) with zinc", "ct": "Recall/interpretation (applying IMCI Plan A rules)", "w": "A child with acute watery diarrhoea and NO dehydration is managed with Plan A: continue feeding, give ORS after each loose stool, and give zinc supplementation for 10–14 days, which reduces the duration and severity of the episode.", "d": "No dehydration signs → Plan A: home care with continued feeding, ORS after each stool, and 14 days of zinc", "t": "Treatment ladder — home ORS and zinc before any escalation to Plan B or Plan C", "f": "No dehydration = Plan A (ORS + feeds + zinc); some dehydration = Plan B; severe = Plan C IV fluids", "r": "No dehydration in acute diarrhoea → Plan A: continued feeding + ORS after each stool + zinc × 14 days", "x": [["B) Intravenous Ringer lactate 20 mL/kg bolus", "IV fluid boluses are reserved for SEVERE dehydration (Plan C) with shock, which is not present here."], ["C) Supervised ORS 75 mL/kg over 4 hours in a treatment room", "Supervised ORS 75 mL/kg over 4 hours is Plan B, for SOME dehydration — this child has none."], ["D) Loperamide with plain water and no feeds", "Loperamide is contraindicated in children with acute diarrhoea, and withholding feeds is wrong; feeding must continue."]]}, {"n": 23, "s": "A 6-week-old girl has prolonged jaundice, constipation since birth, a large tongue, an umbilical hernia, a hoarse cry, and poor feeding. She was born at home and newborn screening was not performed. What is the most appropriate next step?", "o": [["A", "Measure serum TSH and free T4"], ["B", "Abdominal ultrasound to evaluate for biliary atresia"], ["C", "Genetic testing for chromosomal anomalies only"], ["D", "Reassure the parents and reassess at 3 months"]], "c": ["A)", "Measure serum TSH and free T4"], "co": "Congenital hypothyroidism — clinical recognition and confirmation", "ct": "Interpretation (pattern recognition of neonatal hypothyroidism)", "w": "The combination of prolonged jaundice, constipation, macroglossia, umbilical hernia, hoarse cry, and poor feeding is classic congenital hypothyroidism; the next step is to confirm with serum TSH and free T4 so that levothyroxine can be started without delay.", "d": "Prolonged jaundice + constipation + macroglossia + umbilical hernia + hoarse cry = congenital hypothyroidism → confirm with TSH and free T4 before starting levothyroxine", "t": "Pattern recognition — a multisystem constellation that is endocrine, not hepatic", "f": "Prolonged jaundice + constipation + large tongue + umbilical hernia = hypothyroid until proven otherwise", "r": "Clinical congenital hypothyroidism → confirm with TSH + free T4, then start levothyroxine promptly", "x": [["B) Abdominal ultrasound to evaluate for biliary atresia", "Biliary atresia gives CONJUGATED jaundice with pale stools; here the jaundice is one sign among many that point to hypothyroidism, not liver disease."], ["C) Genetic testing for chromosomal anomalies only", "Chromosomal testing is not the first step; the presentation directly suggests an endocrine explaination that should be confirmed biochemically."], ["D) Reassure the parents and reassess at 3 months", "Delaying confirmation risks irreversible neurodevelopmental damage — hypothyroidism must be treated within the first weeks of life."]]}, {"n": 24, "s": "A 9-month-old girl attends a well-baby check. Her mother reports she babbles, reaches for toys, and rolls both ways. Which finding at this age is a red flag for developmental delay?", "o": [["A", "She cannot sit without support"], ["B", "She does not walk alone"], ["C", "She does not speak two-word phrases"], ["D", "She cannot run well"]], "c": ["A)", "She cannot sit without support"], "co": "Developmental milestones — 9-month red flags", "ct": "Interpretation (age-appropriate milestone norms at 9 months)", "w": "A 9-month-old infant should sit without support (mastered by 6–8 months). Absence of independent sitting at this age is a red flag for motor delay, whereas walking alone, two-word phrases, and running are milestones of later ages.", "d": "Independent sitting is expected by 6–8 months; its absence at 9 months is a red flag, while walking alone and two-word phrases are not yet due", "t": "Age-appropriate differential — applying 6-month or 12-month norms to a 9-month-old", "f": "Sits by 6–8 months; stands/ cruises 9–12; walks alone 12–15; two-word phrases 18–24 months", "r": "Absent independent sitting by 9 months = red flag for developmental delay", "x": [["B) She does not walk alone", "Walking alone is expected at 12–15 months, so its absence at 9 months is completely normal."], ["C) She does not speak two-word phrases", "Two-word phrases are an 18–24-month language milestone, not expected at 9 months."], ["D) She cannot run well", "Running is not expected until about 18–24 months, so its absence is normal at 9 months."]]}, {"n": 25, "s": "A 2-year-old boy has had fever of 39.5°C for 6 days. He has bilateral non-exudative conjunctivitis, cracked lips, a strawberry tongue, a 1.5 cm right cervical lymph node, and swelling of the hands and feet. He is irritable. What is the most appropriate treatment?", "o": [["A", "Oral amoxicillin for 10 days for presumed bacterial pharyngitis"], ["B", "Intravenous immunoglobulin (2 g/kg) plus aspirin, started within 10 days of fever onset"], ["C", "Oral prednisolone as the only therapy"], ["D", "Antihistamines and antipyretics, with review in one week"]], "c": ["B)", "Intravenous immunoglobulin (2 g/kg) plus aspirin, started within 10 days of fever onset"], "co": "Kawasaki disease — diagnostic criteria and treatment", "ct": "Interpretation (recognising the fever-plus-criteria pattern and acting on it)", "w": "Fever for 6 days with conjunctivitis, oral mucosal changes, cervical adenopathy, and extremity swelling fulfils Kawasaki disease criteria; treatment with IVIG 2 g/kg plus aspirin within 10 days of fever onset markedly reduces coronary artery aneurysm risk.", "d": "Fever ≥ 5 days + 4 of 5 mucocutaneous features (conjunctivitis, oral changes, adenopathy, extremity changes, rash) = Kawasaki disease → IVIG + aspirin within 10 days to prevent coronary aneurysms", "t": "Severity under-recognition — dismissing a 6-day fever as viral when it is a coronary-threatening vasculitis", "f": "Fever ≥ 5 days + 4/5 mucocutaneous signs = Kawasaki → IVIG + aspirin within 10 days", "r": "Kawasaki disease (fever ≥ 5 days + ≥ 4 mucocutaneous features) → IVIG 2 g/kg + aspirin within 10 days", "x": [["A) Oral amoxicillin for 10 days for presumed bacterial pharyngitis", "No bacterial focus exists; antibiotics do not treat a systemic vasculitis."], ["C) Oral prednisolone as the only therapy", "Corticosteroids are not first-line alone for Kawasaki disease; IVIG is the cornerstone (steroids are reserved for IVIG resistance)."], ["D) Antihistamines and antipyretics, with review in one week", "Delaying treatment past 10 days of fever increases the risk of coronary artery aneurysms — watchful waiting is dangerous."]]}, {"n": 26, "s": "A 3-year-old boy with generalised convulsive status epilepticus is still seizing 10 minutes after two appropriate doses of IV lorazepam. What is the most appropriate second-line agent?", "o": [["A", "IV fosphenytoin 20 mg/kg phenytoin-equivalents"], ["B", "A third IV lorazepam bolus"], ["C", "Oral valproate syrup loading"], ["D", "Repeat IM midazolam alone"]], "c": ["A)", "IV fosphenytoin 20 mg/kg phenytoin-equivalents"], "co": "Status epilepticus — second-line anticonvulsant in children", "ct": "Recall (status epilepticus algorithm)", "w": "When benzodiazepines fail to terminate paediatric status epilepticus, a second-line IV anticonvulsant — fosphenytoin 20 mg/kg phenytoin-equivalents (or levetiracetam) — is given; repeated benzodiazepines alone cause respiratory depression without reliably stopping the seizure.", "d": "Benzodiazepine-refractory paediatric status epilepticus → IV fosphenytoin 20 mg/kg PE (or levetiracetam 40-60 mg/kg); further benzodiazepines alone cause respiratory depression without reliable termination", "t": "Treatment ladder — benzodiazepine-refractory status needs the second-line rung", "f": "Benzo → second line (fosphenytoin 20 mg/kg or levetiracetam) → anaesthesia with EEG if refractory", "r": "Status epilepticus: benzodiazepine first; if refractory, IV fosphenytoin 20 mg/kg PE (or levetiracetam 40-60 mg/kg)", "x": [["B) A third IV lorazepam bolus", "After two adequate benzodiazepine doses, further benzos alone are neither sufficient nor safe (respiratory depression)."], ["C) Oral valproate syrup loading", "Oral agents cannot be given to an actively convulsing child."], ["D) Repeat IM midazolam alone", "IM midazolam is a first-line benzo option when there is no IV access — repeating it as 'second line' repeats the same class."]]}, {"n": 27, "s": "A 24-month-old boy has a vocabulary of eight single words and does not combine two words. He passed newborn hearing screening. What is the most appropriate next step?", "o": [["A", "Reassure the parents and review again at 3 years of age"], ["B", "Request an urgent MRI of the brain"], ["C", "Refer for audiological assessment and early intervention"], ["D", "Start levothyroxine empirically"]], "c": ["C)", "Refer for audiological assessment and early intervention"], "co": "Language development — red flags at 2 years", "ct": "Interpretation (language red flags)", "w": "A 24-month-old should use roughly 50 words and begin combining two words; fewer than 25-50 words or absence of phrases is a language-delay red flag warranting audiological and developmental referral — early intervention, not watchful waiting, is the standard.", "d": "By 2 years expect ~50 words and 2-word phrases; fewer than 25-50 words or no phrases = refer for audiology + early intervention, even with a normal newborn screen", "t": "Severity under-recognition — 'late talker' reassurance misses a red flag", "f": "2 years: ~50 words + 2-word phrases; falling short means refer, not reassure", "r": "No 2-word phrases or <25-50 words at 24 months = audiology referral + early intervention", "x": [["A) Reassure the parents and review again at 3 years of age", "Watchful waiting to 3 years forfeits the early-intervention window."], ["B) Request an urgent MRI of the brain", "Imaging has no role in primary language delay without neurological signs."], ["D) Start levothyroxine empirically", "Hypothyroidism has other features (growth failure, constipation, coarse features); it is not treated empirically."]]}, {"n": 28, "s": "A 7-year-old boy with new-onset diabetic ketoacidosis on IV fluids and insulin develops headache, then bradycardia and a falling Glasgow Coma Scale score. What is the most appropriate immediate management?", "o": [["A", "A further rapid normal saline bolus to improve perfusion"], ["B", "Increase the insulin infusion rate"], ["C", "IV mannitol 0.5-1 g/kg (or 3% saline 2.5-5 mL/kg) and reduce the fluid rate"], ["D", "Obtain a CT head before any intervention"]], "c": ["C)", "IV mannitol 0.5-1 g/kg (or 3% saline 2.5-5 mL/kg) and reduce the fluid rate"], "co": "Diabetic ketoacidosis — cerebral oedema recognition and rescue", "ct": "Analysis/synthesis (emergency management)", "w": "Cerebral oedema is the leading cause of death in paediatric DKA and is a clinical diagnosis: headache, bradycardia, declining GCS. Immediate treatment is IV mannitol 0.5-1 g/kg or 3% saline 2.5-5 mL/kg with airway reassessment and fluid-rate reduction; imaging must not delay therapy.", "d": "Headache + bradycardia + falling GCS in paediatric DKA = cerebral oedema → mannitol/hypertonic saline immediately, reassess ABC, reduce fluids; imaging only after stabilisation", "t": "Iatrogenic trap — treatment-related cerebral oedema, and the rescue is osmotic therapy, not more fluids or insulin", "f": "DKA + headache/bradycardia/GCS drop = mannitol now, CT later", "r": "Paediatric DKA cerebral oedema = IV mannitol 0.5-1 g/kg (or 3% saline) immediately + reduce fluids", "x": [["A) A further rapid normal saline bolus to improve perfusion", "Further saline boluses can worsen cerebral oedema and do not treat it."], ["B) Increase the insulin infusion rate", "Insulin does not treat cerebral oedema; the swelling is related to fluid and glycaemic shifts, not insulin underdosing."], ["D) Obtain a CT head before any intervention", "Transport for CT delays the osmotic therapy that is the priority; imaging comes after stabilisation."]]}, {"n": 29, "s": "A 4-year-old boy has Hb 10.5 g/dL, MCV 65 fL, an RBC count of 5.6 million/µL and a normal ferritin. The Mentzer index (MCV ÷ RBC) is 11.6. What is the most likely diagnosis?", "o": [["A", "Iron deficiency anaemia"], ["B", "Beta thalassaemia trait"], ["C", "Sickle cell disease"], ["D", "Anaemia of chronic disease"]], "c": ["B)", "Beta thalassaemia trait"], "co": "Microcytic anaemia — thalassaemia trait vs iron deficiency (Mentzer index)", "ct": "Interpretation (laboratory discrimination)", "w": "A Mentzer index below 13 with a relatively high red cell count for the degree of anaemia and a normal ferritin points to beta thalassaemia trait; iron deficiency gives a Mentzer above 13 with low ferritin and high RDW.", "d": "Mentzer <13 + relatively high RBC count + normal ferritin = thalassaemia trait; Mentzer >13 + low ferritin = iron deficiency", "t": "Unit/Number — the Mentzer arithmetic (<13 vs >13) separates trait from deficiency", "f": "MCV/RBC <13 → thalassaemia trait; >13 + low ferritin → iron deficiency", "r": "Mentzer index (MCV ÷ RBC): <13 with normal ferritin = thalassaemia trait; >13 with low ferritin = iron deficiency", "x": [["A) Iron deficiency anaemia", "Iron deficiency typically gives a Mentzer index above 13, high RDW and a low ferritin."], ["C) Sickle cell disease", "Sickle cell disease is normocytic with haemolysis and sickle forms on the smear."], ["D) Anaemia of chronic disease", "Anaemia of chronic disease is usually normocytic/normochromic with normal to high ferritin."]]}, {"n": 30, "s": "A 14-year-old boy develops painful swelling of the right testis 4 days after bilateral parotid swelling and fever. He is otherwise well and afebrile. What is the most likely diagnosis?", "o": [["A", "Testicular torsion"], ["B", "Acute epididymitis"], ["C", "Mumps orchitis"], ["D", "Testicular tumour"]], "c": ["C)", "Mumps orchitis"], "co": "Mumps complication — orchitis in the postpubertal male", "ct": "Interpretation (clinical pattern)", "w": "Orchitis complicates mumps in up to a third of postpubertal males, appearing days after parotitis; the preceding parotid swelling makes mumps orchitis the obvious diagnosis, and fertility is rarely affected when involvement is unilateral.", "d": "Parotitis followed days later by acute testicular pain/swelling in a postpubertal boy = mumps orchitis; usually unilateral and self-limiting", "t": "Clinical Mimic — acute scrotum look-alikes in a parotitis context", "f": "Parotitis first, then testicular pain = mumps orchitis; torsion does not follow parotitis", "r": "Postpubertal mumps + unilateral orchitis = supportive care; torsion history (sudden, no parotitis) is the mimic to exclude", "x": [["A) Testicular torsion", "Torsion is sudden and severe without a prodromal parotitis; the parotid history decides against it."], ["B) Acute epididymitis", "Epididymitis is usually accompanied by dysuria or urethritis and follows urinary infection, not parotitis."], ["D) Testicular tumour", "A tumour is a painless, progressive hard mass, not an acute tender swelling days after parotitis."]]}, {"n": 31, "s": "A 4-month-old girl with a mild upper respiratory infection (runny nose, cough, temperature 37.8°C) is brought for her second DPT dose. The mother asks whether vaccination should be postponed. Which statement is correct?", "o": [["A", "Postpone vaccination until the cough has fully resolved for at least 2 weeks"], ["B", "Vaccinate today — mild illness with low-grade fever is not a contraindication"], ["C", "Give a half-dose of DPT today to reduce the risk of reactions"], ["D", "Skip this dose permanently now that the schedule has been interrupted"]], "c": ["B)", "Vaccinate today — mild illness with low-grade fever is not a contraindication"], "co": "Immunisation — DTP contraindications", "ct": "Interpretation (contraindication discrimination)", "w": "Minor illness such as a mild URTI with low-grade fever is not a contraindication to DPT; the true contraindications are anaphylaxis to a previous dose, encephalopathy within 7 days of a previous dose, and progressive neurological disorder.", "d": "True DTP contraindications = anaphylaxis to a prior dose, encephalopathy within 7 days, progressive neurological disease; mild URTI is not one", "t": "Negative discrimination — mild illness is NOT a contraindication", "f": "Mild illness ≠ contraindication; only anaphylaxis, encephalopathy <7 days and progressive neurology stop DTP", "r": "Mild URTI with low-grade fever is not a contraindication to DTP — vaccinate today", "x": [["A) Postpone vaccination until the cough has fully resolved for at least 2 weeks", "Waiting 2 weeks has no scientific basis and only delays protective immunity."], ["C) Give a half-dose of DPT today to reduce the risk of reactions", "Half-doses are not recommended; they do not reduce risk and may impair the immune response."], ["D) Skip this dose permanently now that the schedule has been interrupted", "A missed dose is caught up, not abandoned — the schedule can be resumed without restarting."]]}, {"n": 32, "s": "A 2-year-old boy was found with an open kerosene container and is now coughing. His parents ask what the main danger is. What is the most dangerous complication of kerosene ingestion?", "o": [["A", "Aspiration pneumonitis"], ["B", "Hepatic necrosis"], ["C", "Acute renal failure"], ["D", "Cardiac arrhythmia"]], "c": ["A)", "Aspiration pneumonitis"], "co": "Kerosene (hydrocarbon) poisoning — target organ and mechanism", "ct": "Recall (toxicity mechanism)", "w": "Kerosene's main toxicity is aspiration pneumonitis: the low-viscosity hydrocarbon spreads through the airways during ingestion or induced vomiting, causing chemical pneumonitis — so emesis and gastric lavage are contraindicated and respiratory observation is the priority.", "d": "Hydrocarbons injure by aspiration during ingestion or induced vomiting → chemical pneumonitis is the danger; emesis and lavage are contraindicated", "t": "'What NOT to do' — induced vomiting converts ingestion into aspiration", "f": "Kerosene: never induce vomiting or lavage; watch the lungs, not the liver", "r": "Kerosene ingestion → aspiration pneumonitis is the danger; no emesis, no lavage", "x": [["B) Hepatic necrosis", "Kerosene does not cause clinically significant hepatic necrosis — the lungs, not the liver, are the target organ."], ["C) Acute renal failure", "Acute renal failure is not a feature of kerosene ingestion."], ["D) Cardiac arrhythmia", "Cardiac arrhythmias are not the dangerous complication of kerosene; aspiration is."]]}, {"n": 33, "s": "A 13-year-old boy at the 3rd percentile for height has grown 5 cm in the past year (a normal height velocity), his bone age equals his chronological age, and both parents are short. What is the most likely diagnosis?", "o": [["A", "Constitutional delay of growth and puberty"], ["B", "Growth hormone deficiency"], ["C", "Hypothyroidism"], ["D", "Familial short stature"]], "c": ["D)", "Familial short stature"], "co": "Short stature — familial vs constitutional vs endocrine", "ct": "Interpretation (short stature categorisation)", "w": "Familial short stature is defined by short parents, a normal height velocity and a bone age matching the chronological age, with the final height tracking the parental target range; constitutional delay instead shows a delayed bone age.", "d": "Bone age = chronological age + normal height velocity + short parents = familial; bone age < chronological + delayed puberty = constitutional delay", "t": "Synonym Swap — familial short stature and constitutional delay swapped on bone age", "f": "Bone age = CA → familial; bone age < CA → constitutional delay", "r": "Normal velocity + bone age = CA + short parents = familial short stature", "x": [["A) Constitutional delay of growth and puberty", "Constitutional delay shows a delayed bone age and later pubertal timing."], ["B) Growth hormone deficiency", "GH deficiency produces a slow height velocity and a delayed bone age with parents of normal stature."], ["C) Hypothyroidism", "Hypothyroidism is associated with growth failure plus other features and a delayed bone age."]]}, {"n": 34, "s": "A 6-week-old baby boy is brought to the EPI centre for his first follow-up immunisation visit. He received BCG and OPV-0 at birth. Which set of vaccines is due at this visit?", "o": [["A", "First dose of pentavalent (DPT-HepB-Hib), OPV-1, PCV-1 and rotavirus vaccine"], ["B", "A BCG booster and an oral polio booster"], ["C", "First dose of measles vaccine with vitamin A"], ["D", "MMR and a diphtheria-tetanus booster"]], "c": ["A)", "First dose of pentavalent (DPT-HepB-Hib), OPV-1, PCV-1 and rotavirus vaccine"], "co": "EPI immunisation schedule — the 6-week visit", "ct": "Recall (EPI schedule by visit)", "w": "In the EPI schedule the 6-week visit delivers the first doses of the pentavalent (DPT-HepB-Hib), OPV-1, PCV-1 and rotavirus vaccines; BCG and OPV-0 were the birth doses, while measles/MMR doses come from 9 months onward.", "d": "Birth = BCG + OPV-0 (+HepB-0); 6 weeks = Penta-1 + OPV-1 + PCV-1 + Rota-1; measles is never a 6-week vaccine", "t": "Guideline Version — birth-schedule items carried into the 6-week visit", "f": "6 weeks = first pentavalent + OPV-1 + PCV-1 + rota-1; never measles at 6 weeks", "r": "EPI: birth = BCG + OPV-0 (+HepB-0); 6 weeks = Penta-1 + OPV-1 + PCV-1 + Rota-1", "x": [["B) A BCG booster and an oral polio booster", "BCG is a single birth dose with no scheduled booster in early infancy — repeating it at 6 weeks is not part of the EPI."], ["C) First dose of measles vaccine with vitamin A", "Measles vaccine and vitamin A are not due until 9 months; maternal antibody neutralises the live measles vaccine before that age."], ["D) MMR and a diphtheria-tetanus booster", "MMR is given from 15 months (with MR at 9-15 months depending on the programme) and the DT booster later; neither belongs to the 6-week visit."]]}, {"n": 35, "s": "A 3-year-old girl on maintenance chemotherapy for acute lymphoblastic leukaemia is due for scheduled immunisations. Which vaccine must be withheld while she is significantly immunosuppressed?", "o": [["A", "DPT (diphtheria-pertussis-tetanus)"], ["B", "Inactivated polio vaccine (IPV)"], ["C", "Hepatitis B vaccine"], ["D", "MMR (measles-mumps-rubella)"]], "c": ["D)", "MMR (measles-mumps-rubella)"], "co": "Immunisation in immunocompromised children — live vs inactivated vaccines", "ct": "Analysis/synthesis (vaccine-type risk stratification)", "w": "Live attenuated vaccines can replicate uncontrolled in an immunocompromised child and cause vaccine-strain disease; MMR is live, whereas IPV, DPT and hepatitis B vaccines are inactivated or recombinant and are not contraindicated in immunosuppression.", "d": "Live attenuated vaccines (MMR, varicella, OPV, BCG) are contraindicated in significant immunosuppression; inactivated vaccines (IPV, DPT, HepB, Hib, PCV) are generally permitted", "t": "Partial Truth — 'no vaccines in immunosuppression' applies only to live vaccines", "f": "Ask 'live or killed?' in immunosuppression: live = withhold, killed = usually give", "r": "Significant immunosuppression contraindicates live vaccines (MMR); inactivated vaccines are generally safe", "x": [["A) DPT (diphtheria-pertussis-tetanus)", "DPT is an inactivated toxoid vaccine and is not contraindicated in immunosuppression."], ["B) Inactivated polio vaccine (IPV)", "IPV is inactivated and is actually preferred to OPV when immunosuppression is a concern."], ["C) Hepatitis B vaccine", "Hepatitis B vaccine is a recombinant inactivated vaccine and remains safe and indicated."]]}, {"n": 36, "s": "A newborn girl has bilateral cataracts, a systolic murmur, and a 'blueberry muffin' rash. Her mother recalls a mild maculopapular rash with fever in the first trimester. Which congenital infection is most likely?", "o": [["A", "Toxoplasmosis"], ["B", "Rubella"], ["C", "Cytomegalovirus"], ["D", "Syphilis"]], "c": ["B)", "Rubella"], "co": "Congenital rubella syndrome — TORCH discrimination", "ct": "Analysis/synthesis (TORCH discrimination)", "w": "Congenital rubella syndrome classically pairs bilateral cataracts with congenital heart disease (especially PDA) and sensorineural deafness after first-trimester maternal infection; the blueberry muffin rash reflects extramedullary dermal erythropoiesis.", "d": "Cataracts + PDA ± sensorineural deafness after first-trimester maternal rash = congenital rubella; blueberry muffin = dermal erythropoiesis", "t": "Organism homogeneity — TORCH infections each claim the same neonatal features", "f": "Cataracts + PDA + deafness = rubella; chorioretinitis + hydrocephalus = toxoplasmosis; petechiae + periventricular calcification = CMV", "r": "First-trimester maternal rubella → cataracts, PDA, deafness, blueberry muffin rash", "x": [["A) Toxoplasmosis", "Toxoplasmosis presents with chorioretinitis, hydrocephalus and scattered intracranial calcifications, not cataracts with PDA."], ["C) Cytomegalovirus", "CMV gives petechiae, microcephaly, periventricular calcification and hearing loss — it does not produce cataracts with a cardiac lesion."], ["D) Syphilis", "Early congenital syphilis features hepatosplenomegaly, rhinitis, osteochondritis and a palms/soles rash, not cataracts."]]}, {"n": 37, "s": "A 5-day-old baby girl born at home to an unvaccinated mother presents with refusal to feed, trismus, risus sardonicus and opisthotonic spasms. There is no jaundice. What is the single most effective preventive measure for this disease at the population level?", "o": [["A", "Vitamin K injection at birth"], ["B", "Routine prophylactic antibiotics for all newborns"], ["C", "Universal chlorhexidine cord care alone"], ["D", "Maternal tetanus toxoid immunisation"]], "c": ["D)", "Maternal tetanus toxoid immunisation"], "co": "Neonatal tetanus — population-level prevention", "ct": "Interpretation (prevention strategy)", "w": "The presentation is neonatal tetanus, which virtually only occurs when the mother is unimmunised; maternal tetanus toxoid (with clean cord care) is the proven and most effective prevention, which is why tetanus toxoid is a routine pregnancy vaccine in the EPI.", "d": "Neonatal tetanus = trismus + risus sardonicus + opisthotonos in the first week of life; maternal TT immunisation is the proven prevention", "t": "Priority inversion — baby-level interventions chosen over maternal immunisation", "f": "Neonatal tetanus = ask about maternal TT; prevention = immunise the mother", "r": "Neonatal tetanus is prevented by maternal tetanus toxoid immunisation; presentation = trismus, risus sardonicus, opisthotonos", "x": [["A) Vitamin K injection at birth", "Vitamin K prevents haemorrhagic disease of the newborn, not tetanus."], ["B) Routine prophylactic antibiotics for all newborns", "Antibiotics do not prevent toxin-mediated tetanus and are not used for population prevention."], ["C) Universal chlorhexidine cord care alone", "Clean cord care reduces risk but maternal immunisation is the single most effective measure."]]}, {"n": 38, "s": "A 3-year-old boy ingested an estimated 200 mg/kg of paracetamol 3 hours ago and is currently asymptomatic. What is the most appropriate management?", "o": [["A", "Wait for the 4-hour level and treat only if it exceeds the nomogram line"], ["B", "Give activated charcoal and discharge if he remains asymptomatic at 6 hours"], ["C", "Start N-acetylcysteine immediately and obtain a 4-hour paracetamol level"], ["D", "Observe at home and return only if vomiting develops"]], "c": ["C)", "Start N-acetylcysteine immediately and obtain a 4-hour paracetamol level"], "co": "Acute paracetamol poisoning in children — treatment threshold", "ct": "Interpretation (toxicology thresholds)", "w": "A single acute paracetamol ingestion above 150 mg/kg warrants N-acetylcysteine without delay; a 4-hour level is drawn to confirm or exclude toxicity, and treatment started early is far more effective than waiting for the result.", "d": "Single acute ingestion >150 mg/kg (or unknown) in a child → NAC now; the 4-hour nomogram is for confirmation, not a reason to delay therapy", "t": "Unit/Number — the 150 mg/kg threshold triggers NAC before the 4-hour nomogram", "f": ">150 mg/kg or unknown dose → NAC now; NAC works best before 8-10 hours", "r": "Paracetamol >150 mg/kg single ingestion = immediate N-acetylcysteine + 4-hour level", "x": [["A) Wait for the 4-hour level and treat only if it exceeds the nomogram line", "The nomogram interprets the level once taken; with a known supratherapeutic dose treatment is started immediately, not withheld."], ["B) Give activated charcoal and discharge if he remains asymptomatic at 6 hours", "Charcoal is adjunctive and no substitute for NAC at this dose; discharging at 6 hours ignores the treatment needed."], ["D) Observe at home and return only if vomiting develops", "This dose is potentially hepatotoxic and needs active treatment, not home observation."]]}, {"n": 39, "s": "A 15-year-old boy has no testicular enlargement, scanty pubic hair, height at the 5th percentile and a bone age of 12 years. His father says he 'grew in his late teens'. What is the most likely diagnosis?", "o": [["A", "Klinefelter syndrome"], ["B", "Growth hormone deficiency"], ["C", "Constitutional delay of growth and puberty"], ["D", "Hypergonadotropic hypogonadism"]], "c": ["C)", "Constitutional delay of growth and puberty"], "co": "Delayed puberty — constitutional delay vs pathology", "ct": "Interpretation (delayed puberty evaluation)", "w": "Constitutional delay of growth and puberty is the most common cause of delayed puberty in boys; the combination of a delayed bone age, a family history of late puberty and the absence of systemic or syndromic features supports it, and the child achieves normal puberty and height eventually.", "d": "No testicular enlargement by 14 years = delayed puberty; bone age < chronological + family history of late puberty + no syndromic features = constitutional delay (most common in boys)", "t": "Overthinking — family history plus delayed bone age make constitutional delay the default, not exotic syndromes", "f": "Delayed puberty in a boy: bone age + family history → constitutional delay first", "r": "Delayed puberty with bone age < CA + family history = constitutional delay of growth and puberty", "x": [["A) Klinefelter syndrome", "Klinefelter syndrome has small firm testes with gynaecomastia and elevated gonadotropins, not a family history pattern of late normal puberty."], ["B) Growth hormone deficiency", "GH deficiency affects height velocity from early childhood rather than pubertal timing."], ["D) Hypergonadotropic hypogonadism", "Hypergonadotropic hypogonadism implies primary gonadal failure with high FSH/LH — not the default picture here."]]}, {"n": 40, "s": "A 3-year-old boy who was never vaccinated develops acute asymmetric flaccid paralysis of the left leg with preserved sensation and no fever. He had a diarrhoeal illness 10 days earlier. What is the most important public health action?", "o": [["A", "Order urgent MRI of the spine before anything else"], ["B", "Notify as acute flaccid paralysis and collect two stool specimens 24 hours apart"], ["C", "Start corticosteroids for presumed transverse myelitis"], ["D", "Refer for nerve conduction studies and wait for the results"]], "c": ["B)", "Notify as acute flaccid paralysis and collect two stool specimens 24 hours apart"], "co": "Poliomyelitis — acute flaccid paralysis surveillance", "ct": "Analysis/synthesis (surveillance imperative)", "w": "Any acute flaccid paralysis in a child under 15 years is notifiable as AFP for polio surveillance: two stool specimens collected 24 hours apart within 14 days of onset are the critical samples, and notification triggers field investigation regardless of other tests.", "d": "Asymmetric flaccid paralysis + preserved sensation + no fever = AFP until proven otherwise → notify within 24-48 h and collect 2 stool specimens 14 days of onset", "t": "Investigation hierarchy — AFP notification and stool sampling outrank imaging", "f": "AFP = notify + two stools within 14 days; never wait for imaging to notify", "r": "Acute asymmetric flaccid paralysis + preserved sensation = AFP → notify and collect two stool specimens 24 h apart", "x": [["A) Order urgent MRI of the spine before anything else", "Imaging can be pursued in parallel but must never delay notification and stool sampling for polio."], ["C) Start corticosteroids for presumed transverse myelitis", "Corticosteroids are for inflammatory myelitis; starting them without a diagnosis is wrong in AFP."], ["D) Refer for nerve conduction studies and wait for the results", "Nerve conduction studies are supportive but do not replace the mandatory surveillance specimens."]]}, {"n": 41, "s": "A 6½-year-old girl has breast buds (Tanner II), pubic hair and a growth spurt over 4 months. Bone age is 8 years. Which is the most appropriate management?", "o": [["A", "Reassurance and review at the annual visit"], ["B", "GnRH analogue therapy after evaluating for an underlying CNS cause"], ["C", "Oestrogen replacement to drive puberty to completion"], ["D", "Aromatase inhibitor without further evaluation"]], "c": ["B)", "GnRH analogue therapy after evaluating for an underlying CNS cause"], "co": "Precocious puberty — diagnosis and treatment", "ct": "Analysis/synthesis (diagnosis + therapy)", "w": "Pubertal signs before 8 years in a girl with accelerated growth and advanced bone age indicate central precocious puberty; a GnRH analogue pauses puberty and preserves adult height, and an underlying CNS cause (e.g. hypothalamic hamartoma) should be sought, particularly in the youngest children.", "d": "Breast development <8 years + advanced bone age + accelerated growth = central precocious puberty → GnRH analogue + CNS imaging (MRI) to exclude a hypothalamic lesion", "t": "Treatment ladder — observation or sex steroids are the wrong rungs in progressive central precocious puberty", "f": "Girls <8 / boys <9 with progressive pubertal signs + advanced bone age = GnRH analogue + MRI", "r": "Central precocious puberty (girl <8 y, advanced bone age) = GnRH analogue + evaluation for CNS cause", "x": [["A) Reassurance and review at the annual visit", "Progressive precocious puberty with advanced bone age should not be observed."], ["C) Oestrogen replacement to drive puberty to completion", "Oestrogen would accelerate, not pause, puberty and would worsen the height loss."], ["D) Aromatase inhibitor without further evaluation", "Peripheral causes and CNS screening matter; aromatase inhibitors are a niche second-line option, not first-line."]]}, {"n": 42, "s": "A 12-year-old boy who had measles at 2 years of age presents with 3 months of declining school performance, personality change and myoclonic jerks. EEG shows periodic slow-wave complexes. What is the most likely diagnosis?", "o": [["A", "Rasmussen encephalitis"], ["B", "Juvenile myoclonic epilepsy"], ["C", "Herpes simplex encephalitis"], ["D", "Subacute sclerosing panencephalitis (SSPE)"]], "c": ["D)", "Subacute sclerosing panencephalitis (SSPE)"], "co": "Measles complication — subacute sclerosing panencephalitis", "ct": "Analysis/synthesis (late complication timeline)", "w": "SSPE is a rare, fatal degenerative disease of persistent measles virus, presenting 5-10 years after the primary infection with cognitive decline, myoclonic jerks and periodic slow-wave complexes on EEG.", "d": "Years after measles: progressive cognitive decline + myoclonus + periodic EEG complexes = SSPE (degenerative, fatal)", "t": "Pattern recognition — myoclonus + periodic EEG complexes in a measles survivor", "f": "Years-after-measles encephalopathy + myoclonus = SSPE, not epilepsy", "r": "Measles years earlier + progressive dementia + myoclonus + periodic EEG complexes = SSPE", "x": [["A) Rasmussen encephalitis", "Rasmussen encephalitis causes progressive unilateral hemispheric atrophy with focal seizures and epilepsia partialis continua, not a dementia-like decline."], ["B) Juvenile myoclonic epilepsy", "Juvenile myoclonic epilepsy has myoclonic seizures with normal intellect and a normal background EEG."], ["C) Herpes simplex encephalitis", "Herpes simplex encephalitis is an acute febrile illness with temporal lobe involvement, not a chronic decline years after measles."]]}, {"n": 43, "s": "A 5-month-old boy is brought during a measles outbreak and his mother insists on early measles vaccination. In the routine EPI schedule the first measles dose is given at 9 months. What is the main reason for this timing?", "o": [["A", "The vaccine causes severe febrile reactions before 9 months"], ["B", "Infants younger than 9 months do not develop a rash, so the vaccine response cannot be checked"], ["C", "Maternal measles antibodies neutralise the live vaccine before 9 months"], ["D", "Combined measles-rubella vaccine is not available before 9 months"]], "c": ["C)", "Maternal measles antibodies neutralise the live vaccine before 9 months"], "co": "Immunisation — measles vaccine timing (maternal antibody interference)", "ct": "Interpretation (maternal antibody immunology)", "w": "Routine measles vaccination is scheduled at 9 months because persisting maternal IgG neutralises the live attenuated virus, making earlier doses far less immunogenic; waiting allows the antibody to wane so the vaccine can replicate and produce lasting immunity.", "d": "Transplacentally acquired maternal IgG neutralises live measles vaccine → replication and seroconversion only after antibody wanes (~9 months)", "t": "Opposite — 'earlier must be more protective' reverses the true immunology", "f": "Live vaccines are blunted by circulating maternal antibody; measles is timed at 9 months for this reason", "r": "Measles vaccine before 9 months fails because maternal IgG neutralises the live virus — the age is set to allow antibody waning", "x": [["A) The vaccine causes severe febrile reactions before 9 months", "The delay is about efficacy, not safety — measles vaccine is not unusually reactogenic in young infants."], ["B) Infants younger than 9 months do not develop a rash, so the vaccine response cannot be checked", "The rash response is irrelevant to immunisation decisions; lack of seroconversion is the reason for delay."], ["D) Combined measles-rubella vaccine is not available before 9 months", "MR vaccine availability is a programme logistics issue, not the biological basis for the 9-month schedule."]]}, {"n": 44, "s": "A 4-month-old girl's head circumference has crossed from the 50th to above the 97th percentile in 8 weeks, and her anterior fontanelle is full and tense. Weight and length are at the 50th percentile. What is the most appropriate next step?", "o": [["A", "Reassure — head size is genetically determined"], ["B", "Urgent evaluation for raised intracranial pressure (hydrocephalus)"], ["C", "Advise reducing calorie intake to slow head growth"], ["D", "Repeat the measurement at the 6-month visit only"]], "c": ["B)", "Urgent evaluation for raised intracranial pressure (hydrocephalus)"], "co": "Growth interpretation — head circumference crossing centiles", "ct": "Interpretation (growth parameter interpretation)", "w": "Head circumference is the single most informative growth parameter in infancy; sustained upward crossing of centiles with a tense fontanelle indicates raised intracranial pressure until proven otherwise and requires urgent evaluation (imaging with neurosurgical review).", "d": "Head circumference crossing centiles upward + tense fontanelle = raised ICP (hydrocephalus, subdural collection) → urgent imaging; unlike weight/length crossing, this is not brushed off as constitutional", "t": "Severity under-recognition — upward centile crossing dismissed as genetics", "f": "Head circumference crossing up = pathology until proven otherwise; weight/length crossing is a different workup", "r": "Upward centile crossing of head circumference + tense fontanelle = urgent evaluation for hydrocephalus", "x": [["A) Reassure — head size is genetically determined", "Genetic macrocephaly does not tense the fontanelle or cross centiles sharply in weeks."], ["C) Advise reducing calorie intake to slow head growth", "Calorie restriction is inappropriate and dangerous; head growth is not diet-driven."], ["D) Repeat the measurement at the 6-month visit only", "Deferring re-measurement delays the diagnosis of hydrocephalus."]]}, {"n": 45, "s": "During an outreach immunisation session a health worker asks which vaccine is damaged by FREEZING and must never be placed in a freezer. Which of the following is correct?", "o": [["A", "Oral polio vaccine (OPV)"], ["B", "DPT (triple antigen)"], ["C", "Measles vaccine (lyophilised)"], ["D", "BCG vaccine (lyophilised)"]], "c": ["B)", "DPT (triple antigen)"], "co": "Cold chain — freeze-sensitive vaccines", "ct": "Recall (cold chain rules)", "w": "DPT is an aluminium-adsorbed vaccine whose adjuvant-antigen complex is irreversibly damaged by freezing; OPV is deliberately stored frozen, and lyophilised measles and BCG tolerate freezing — they are instead damaged by heat and light.", "d": "Aluminium-adsorbed liquid vaccines (DPT, HepB, Hib, PCV, TT) lose potency on freezing; freeze-dried live vaccines (measles, BCG) tolerate freezing but are heat/light-sensitive, and OPV is itself stored frozen", "t": "Synonym Swap — 'freeze-dried' misread as 'freeze-safe'", "f": "Freezing kills DPT/HepB/Hib/PCV/TT; freeze-dried live vaccines are heat/light-sensitive; OPV lives in the freezer", "r": "Aluminium-adsorbed vaccines (DPT, HepB, Hib, PCV, TT) are damaged by freezing; lyophilised live vaccines tolerate freezing", "x": [["A) Oral polio vaccine (OPV)", "OPV may be stored frozen as part of the cold chain — freezing preserves rather than destroys it."], ["C) Measles vaccine (lyophilised)", "Lyophilised measles vaccine tolerates freezing; it is damaged by heat and light, especially after reconstitution."], ["D) BCG vaccine (lyophilised)", "BCG is also freeze-dried and tolerates freezing; its enemies are heat and light."]]}, {"n": 46, "s": "A 4-year-old boy with organophosphate poisoning was atropinised and improved. Forty-eight hours later he is alert with dry secretions but develops neck-flexor weakness, proximal limb weakness and shallow breathing. What is the most likely diagnosis and treatment?", "o": [["A", "Relapse of cholinergic crisis — give more atropine"], ["B", "Organophosphate-induced delayed polyneuropathy — physiotherapy only"], ["C", "Guillain-Barré syndrome — intravenous immunoglobulin"], ["D", "Intermediate syndrome — supportive ventilation with early pralidoxime"]], "c": ["D)", "Intermediate syndrome — supportive ventilation with early pralidoxime"], "co": "Organophosphate poisoning — intermediate syndrome", "ct": "Analysis/synthesis (complication timing)", "w": "Intermediate syndrome appears 24-96 hours after organophosphate exposure, after the acute cholinergic crisis, with neck-flexor and proximal weakness and respiratory insufficiency while the patient is conscious; cholinergic signs are absent, so management is supportive ventilation with early pralidoxime, not atropine.", "d": "24-96 h after apparent recovery: neck-flexor + proximal weakness with DRY secretions = intermediate syndrome (neuromuscular), managed with ventilation; pralidoxime is most effective early", "t": "Treatment misdirection — the atropine reflex misfires when secretions are already dry", "f": "Weak neck flexors + dry secretions 1-4 days after OP exposure = intermediate syndrome, not cholinergic relapse", "r": "Intermediate syndrome (24-96 h, neck-flexor weakness, dry secretions) = ventilation + early pralidoxime; atropine is for cholinergic excess", "x": [["A) Relapse of cholinergic crisis — give more atropine", "Atropine treats muscarinic excess — here secretions are dry and the weakness is neuromuscular (nicotinic), so more atropine is wrong."], ["B) Organophosphate-induced delayed polyneuropathy — physiotherapy only", "Delayed polyneuropathy is distal and appears weeks later, not with proximal weakness at 48 hours."], ["C) Guillain-Barré syndrome — intravenous immunoglobulin", "GBS is ascending and areflexic; the organophosphate timeline and spared sensation point to intermediate syndrome."]]}, {"n": 47, "s": "A 10-month-old girl is below the 3rd centile for weight with normal length and head circumference. During a 5-day admission she gains 300 g when the nursing staff feed her. What is the most likely diagnosis?", "o": [["A", "Malabsorption (coeliac disease)"], ["B", "Growth hormone deficiency"], ["C", "Non-organic (psychosocial) failure to thrive"], ["D", "Congenital hypothyroidism"]], "c": ["C)", "Non-organic (psychosocial) failure to thrive"], "co": "Failure to thrive — organic vs non-organic", "ct": "Interpretation (behavioural discrimination)", "w": "Marked weight gain within days when feeding and environment are controlled is the classic discriminator of psychosocial (non-organic) failure to thrive; organic causes such as malabsorption or endocrinopathy do not reverse this quickly.", "d": "Rapid catch-up weight gain with adequate feeding in hospital = non-organic FTT; normal length/head circumference argues against endocrine or organic disease", "t": "Pattern recognition — rapid hospital weight gain is the classic behavioural signal", "f": "Give food, watch the scales: rapid hospital weight gain = non-organic FTT", "r": "Hospital weight gain with adequate feeding = non-organic FTT; organic causes do not reverse in days", "x": [["A) Malabsorption (coeliac disease)", "Coeliac disease would not show dramatic catch-up with standard ward feeding and is typically accompanied by diarrhoea."], ["B) Growth hormone deficiency", "GH deficiency spares weight and affects length and growth velocity, not weight-for-age alone."], ["D) Congenital hypothyroidism", "Hypothyroidism presents with global growth failure, constipation and coarse features."]]}, {"n": 48, "s": "A 2-year-old girl with 6 hours of fever develops a non-blanching petechial-purpuric rash, cold extremities, tachycardia and lethargy. What is the most appropriate immediate management?", "o": [["A", "Lumbar puncture first to confirm the diagnosis"], ["B", "Blood culture followed immediately by IV ceftriaxone"], ["C", "Oral amoxicillin and review in the morning"], ["D", "IV antihistamines for a presumed allergic rash"]], "c": ["B)", "Blood culture followed immediately by IV ceftriaxone"], "co": "Meningococcal septicaemia — recognition and emergency treatment", "ct": "Interpretation/analysis (sepsis recognition + resuscitation priorities)", "w": "Non-blanching purpuric rash with fever and shock is meningococcal septicaemia until proven otherwise; the priority is a blood culture followed immediately by IV ceftriaxone (or cefotaxime), and lumbar puncture is deferred while the child is unstable because positioning risks respiratory arrest.", "d": "Fever + non-blanching purpuric rash + shock in a young child = meningococcaemia → blood culture then IV ceftriaxone in minutes; LP is deferred in the unstable child", "t": "'What NOT to do' — the LP-first reflex and 'rash' reassurances waste the antibiotic minutes", "f": "Fever + purpura + shock = antibiotics in minutes; LP only once stable", "r": "Meningococcaemia (fever + purpura + shock) = blood culture + IV ceftriaxone immediately; defer LP until stable", "x": [["A) Lumbar puncture first to confirm the diagnosis", "LP is deferred in an unstable, shocked child and must never precede antibiotics in suspected meningococcaemia."], ["C) Oral amoxicillin and review in the morning", "This is a time-critical sepsis needing IV therapy, not an outpatient prescription."], ["D) IV antihistamines for a presumed allergic rash", "Antihistamines treat urticarial allergy; purpura is not urticaria, and the child is shocked."]]}, {"n": 49, "s": "A 15-month-old girl drinks over a litre of unmodified cow's milk daily, has pica and pallor, and Hb 8.2 g/dL with MCV 62 fL, low ferritin and high RDW. What is the most appropriate management?", "o": [["A", "Immediate packed red cell transfusion"], ["B", "Oral iron alone, with the cow's milk intake unchanged"], ["C", "Vitamin B12 and folate supplementation"], ["D", "Oral elemental iron 3-6 mg/kg/day plus counselling to limit cow's milk"]], "c": ["D)", "Oral elemental iron 3-6 mg/kg/day plus counselling to limit cow's milk"], "co": "Iron deficiency anaemia in a toddler — management", "ct": "Analysis/synthesis (management plan)", "w": "Iron deficiency from excessive cow's milk is treated with oral elemental iron 3-6 mg/kg/day plus dietary correction — limiting milk to about 500 mL/day and encouraging iron-rich foods; transfusion is reserved for severe symptomatic anaemia.", "d": "Cow's-milk excess + microcytic anaemia + pica + low ferritin = iron deficiency → oral elemental iron 3-6 mg/kg/day AND reduce milk to ~500 mL/day; transfusion reserved for severe symptomatic cases", "t": "Partial Truth — correcting the iron without the dietary arm is only half the treatment", "f": "Iron deficiency in a toddler: oral iron dose + milk restriction in the same answer", "r": "Toddler iron deficiency = oral elemental iron 3-6 mg/kg/day + limit cow's milk (~500 mL/day)", "x": [["A) Immediate packed red cell transfusion", "Transfusion is for haemodynamic compromise or much lower, symptomatic Hb — not routine in this child."], ["B) Oral iron alone, with the cow's milk intake unchanged", "Iron alone without milk restriction continues the calcium-iron competition and mucosal block."], ["C) Vitamin B12 and folate supplementation", "B12 and folate treat macrocytic anaemia — this is a microcytic picture with low ferritin."]]}, {"n": 50, "s": "A healthy 6-month-old boy is brought for routine vaccination. Which of the following developmental findings is NORMAL for this age?", "o": [["A", "Uses a neat pincer grasp to pick up a raisin"], ["B", "Rolls from back to front in both directions"], ["C", "Sits steadily without support"], ["D", "Says 'mama' and 'dada' specifically"]], "c": ["B)", "Rolls from back to front in both directions"], "co": "Normal development — gross and fine motor milestones at 6 months", "ct": "Recall/interpretation (Denver milestones)", "w": "Rolling in both directions is achieved by about 6 months; independent sitting (~8 months), a neat pincer grasp (~9-10 months) and specific 'mama/dada' (~12 months) are all later milestones, so only rolling is age-appropriate.", "d": "6 months: rolls both ways, sits with support, babbles; sitting unsupported ~8 mo, pincer grasp ~9-10 mo, specific words ~12 mo", "t": "Age-appropriate differential — 8-12 month skills awarded to a 6-month-old", "f": "6 mo = rolls both ways + sits with support; don't award 8-12 month skills to a 6-month-old", "r": "6 months = rolling both ways (and sitting with support); later skills: unsupported sit 8 mo, pincer 9-10 mo, words 12 mo", "x": [["A) Uses a neat pincer grasp to pick up a raisin", "A neat pincer grasp is a 9-10 month skill; a 6-month-old uses a whole-hand (palmar) grasp."], ["C) Sits steadily without support", "Sitting steadily without support is an ~8-month milestone."], ["D) Says 'mama' and 'dada' specifically", "Specific use of 'mama'/'dada' comes around 12 months; at 6 months there is babbling."]]}, {"n": 51, "s": "A 9-month-old with known tetralogy of Fallot turns blue and limp during a feeding spell. His oxygen saturation drops to 60% and the murmur gets quieter. What is the most appropriate immediate treatment sequence?", "o": [["A", "Knee-chest position, oxygen, morphine, fluid, then propranolol/esmolol; prepare for surgery if refractory"], ["B", "Digoxin to improve contractility"], ["C", "Furosemide bolus"], ["D", "Immediate cardiac catheterisation"]], "c": ["A)", "Knee-chest position, oxygen, morphine, fluid, then propranolol/esmolol; prepare for surgery if refractory"], "co": "Tetralogy spell management", "ct": "Analysis/Synthesis", "w": "A hypercyanotic (tet) spell is treated to reduce infundibular spasm and increase systemic vascular resistance: knee-chest/squat position, 100% oxygen, morphine, IV volume, sodium bicarbonate for acidosis, and IV propranolol/esmolol; refractory spells demand emergency shunt or corrective surgery.", "d": "Hypercyanotic spell: squatting/knee-chest ↑SVR, oxygen, morphine ↓ infundibular spasm, volume, beta-blockade; digoxin/diuretics are for failure not spells", "t": "Physiology-reversal trap", "f": "Tet spell: knee-chest ↑ afterload, O2, morphine, volume, beta-blocker; NEVER digoxin/furosemide for spells.", "r": "Tet spell therapy ladder: knee-chest, O2, morphine, normal saline, bicarbonate, propranolol/esmolol; refractory → urgent surgical shunt/repair; treat iron deficiency as precipitant.", "x": [["B) Digoxin to improve contractility", "Digoxin increases contractility which can worsen infundibular obstruction during a spell."], ["C) Furosemide bolus", "Furosemide reduces preload, the opposite of what a cyanotic spell needs."], ["D) Immediate cardiac catheterisation", "Catheterisation is not first-line for a spell; medical therapy precedes and surgery is arranged after stabilisation."]]}, {"n": 52, "s": "A 6-month-old has clusters of brief symmetric flexor spasms that started last week, with developmental regression and an EEG showing hypsarrhythmia. Which is the best initial drug class for this epilepsy syndrome?", "o": [["A", "Vigabatrin or corticosteroid (ACTH) as first-line treatment"], ["B", "Carbamazepine"], ["C", "Phenytoin"], ["D", "Valproate alone"]], "c": ["A)", "Vigabatrin or corticosteroid (ACTH) as first-line treatment"], "co": "Infantile spasms (West syndrome) treatment", "ct": "Recall", "w": "Infantile spasms respond to vigabatrin or adrenocorticotropic hormone/steroids (with hormonal therapy often favoured); carbamazepine and phenytoin are ineffective and can worsen the pattern; early treatment improves developmental outcome.", "d": "Cluster flexor spasms + regression + hypsarrhythmia = infantile spasms; vigabatrin (esp. tuberous sclerosis) or ACTH/steroids is first-line, not traditional AEDs", "t": "AED-selection trap for an epileptic encephalopathy", "f": "West syndrome: hypsarrhythmia + spasms + regression → vigabatrin or ACTH; avoid carbamazepine/phenytoin.", "r": "Infantile spasms: first-line vigabatrin (especially in tuberous sclerosis) or ACTH/steroids; evaluate for underlying cause; prompt treatment correlates with better neurodevelopment.", "x": [["B) Carbamazepine", "Carbamazepine is ineffective in infantile spasms."], ["C) Phenytoin", "Phenytoin similarly has no role in this epileptic encephalopathy."], ["D) Valproate alone", "Valproate monotherapy is not the standard first-line for infantile spasms and carries caution in young infants."]]}, {"n": 53, "s": "A 6-hour-old neonate born at term after prolonged rupture of membranes (24 hours) and maternal fever develops grunting, poor perfusion and oxygen requirement. Which empirical antibiotic pair is the standard first-line for early-onset neonatal sepsis?", "o": [["A", "Ampicillin plus gentamicin"], ["B", "Ceftriaxone alone"], ["C", "Metronidazole alone"], ["D", "Azithromycin"]], "c": ["A)", "Ampicillin plus gentamicin"], "co": "Empiric early-onset neonatal sepsis therapy", "ct": "Recall", "w": "Early neonatal sepsis (first 72 h, typically group B Streptococcus and enteric gram-negatives) is empirically treated with ampicillin plus an aminoglycoside (gentamicin); this combination covers GBS, Listeria, and E. coli with synergistic activity.", "d": "Early-onset sepsis (GBS + E. coli) → ampicillin + gentamicin for synergy/coverage; cephalosporins alone risk resistance and do not cover Listeria ideally", "t": "Antibiotic-regimen trap in neonates", "f": "Early-onset neonatal sepsis: ampicillin + gentamicin; add/switch per culture, local resistance, meningitis cover (cefotaxime).", "r": "Early-onset neonatal sepsis: IV ampicillin + gentamicin empirically; if meningitis suspected, cefotaxime ± ampicillin; tailor to cultures and local resistance patterns.", "x": [["B) Ceftriaxone alone", "Ceftriaxone monotherapy risks resistance, poor Listeria/enterococcal activity and calcium-precipitation concerns in neonates."], ["C) Metronidazole alone", "Metronidazole treats anaerobes, not the dominant early-onset pathogens."], ["D) Azithromycin", "Azithromycin has no place in empiric early-onset sepsis."]]}, {"n": 54, "s": "A newborn screening blood spot from a baby born at term shows a high TSH and low T4 at day 3 of life. The infant is asymptomatic and feeding well. What is the correct action?", "o": [["A", "Start levothyroxine immediately and confirm with venous sample; recall urgently"], ["B", "Repeat the screen at 6 weeks"], ["C", "Treat only if the baby develops symptoms"], ["D", "Start iodine drops only"]], "c": ["A)", "Start levothyroxine immediately and confirm with venous sample; recall urgently"], "co": "Congenital hypothyroidism screening response", "ct": "Recall", "w": "Screening-identified congenital hypothyroidism mandates immediate confirmatory venous TSH/free-T4 and levothyroxine initiation (10-15 µg/kg/day); delayed treatment beyond the first weeks causes irreversible intellectual impairment, so asymptomatic presentation does not permit watchful waiting.", "d": "High TSH + low T4 newborn screen = congenital hypothyroidism until proven otherwise; levothyroxine start is time-critical to protect neurodevelopment, never wait for symptoms", "t": "Watchful-waiting trap in a time-critical endocrine screen", "f": "Newborn TSH↑/T4↓: start L-thyroxine immediately, confirm with venous sample; recurrent audit — irreversible brain damage if delayed.", "r": "Congenital hypothyroidism: screening high TSH/low T4 → confirm venous, start levothyroxine 10-15 µg/kg/day ASAP, frequent dose titration, normalise T4 within 2 weeks.", "x": [["B) Repeat the screen at 6 weeks", "Delaying diagnosis and treatment for weeks risks permanent neurodevelopmental damage."], ["C) Treat only if the baby develops symptoms", "Symptoms are often subtle/absent in the newborn period; the biochemistry, not symptomatic status, drives therapy."], ["D) Start iodine drops only", "Iodine drops are not the therapy for thyroid dysgenesis — the commonest cause."]]}, {"n": 55, "s": "A 10-year-old monitored at school has hypertension found by the school nurse; his arm blood pressure is 140/90, leg blood pressure 105/70, and femoral pulses feel weak and delayed. What is the most likely diagnosis and confirmatory test?", "o": [["A", "Coarctation of aorta — confirm with echocardiography/CT angiography"], ["B", "Essential hypertension — confirm with ambulatory monitoring"], ["C", "Renal artery stenosis — confirm with renin sampling"], ["D", "Phaeochromocytoma — confirm with metanephrines"]], "c": ["A)", "Coarctation of aorta — confirm with echocardiography/CT angiography"], "co": "Coarctation recognition in the older child", "ct": "Interpretation", "w": "Four-limb BP discrepancy with weak delayed femoral pulses is the classic coarctation signature in older children (who escape newborn detection); echocardiography shows the narrowed segment and gradient, with CT/MRI angiography for anatomy.", "d": "Upper-limb hypertension with lower-limb hypotension and delayed femoral pulses in a child = coarctation; imaging confirms", "t": "Clinical Mimic — secondary HTN causes in children", "f": "Child with HTN: always measure lower-limb BP; if arm>leg by >20 mmHg with weak pulses → coarctation.", "r": "Coarctation: upper limb BP > lower limb, delayed femoral pulse, echo narrowing/gradient; repair by surgery or stent; long-term surveillance for re-coarctation and aneurysm.", "x": [["B) Essential hypertension — confirm with ambulatory monitoring", "Essential hypertension in children is a diagnosis of exclusion and does not produce a leg-arm gradient."], ["C) Renal artery stenosis — confirm with renin sampling", "Renal artery stenosis does not explain the leg-weak-pulse asymmetry."], ["D) Phaeochromocytoma — confirm with metanephrines", "Phaeochromocytoma causes paroxysmal spells of hypertension, not a limb-pressure gradient."]]}, {"n": 56, "s": "A 3-year-old with a close adult contact recently diagnosed with sputum-positive pulmonary tuberculosis has a positive interferon-gamma release assay; chest X-ray shows right hilar lymphadenopathy with no parenchymal lesion; he is asymptomatic. What is the correct management?", "o": [["A", "Treat as latent TB infection — isoniazid (or rifampicin-based regimen) after excluding active disease"], ["B", "No treatment since he is asymptomatic"], ["C", "Start four-drug anti-TB therapy for active pulmonary disease"], ["D", "BCG vaccine now"]], "c": ["A)", "Treat as latent TB infection — isoniazid (or rifampicin-based regimen) after excluding active disease"], "co": "Childhood TB: latent infection treatment", "ct": "Interpretation", "w": "An asymptomatic child with a positive IGRA and chest X-ray showing hilar lymphadenopathy without parenchymal disease fits latent TB infection (or primary complex); treatment with INH (6-9 months) or a short rifampicin course prevents progression to active disease, especially in the under-5s.", "d": "Positive IGRA + contact + chest X-ray with only nodal changes, asymptomatic = LTBI (or primary complex) — treat to prevent progression, often INH 6-9 months or 3-4 months rifampicin", "t": "LTBI-vs-active-disease trap", "f": "Positive IGRA + contact + normal/nodal-only chest X-ray + asymptomatic = LTBI: INH 6-9 mo (or rifampicin 4 mo), NOT four-drug therapy.", "r": "LTBI in children: isoniazid 10 mg/kg daily × 6-9 months (or rifampicin 4 months); active disease = 4-drug (RIPE) 2 months then 2-drug continuation; young children with contacts are high priority.", "x": [["B) No treatment since he is asymptomatic", "Children under 5 with TB exposure and positive IGRA progress to disseminated/miliary TB and must be treated even if asymptomatic."], ["C) Start four-drug anti-TB therapy for active pulmonary disease", "Four-drug therapy is for active tuberculosis, which this X-ray/clinical picture does not establish (no parenchymal lesion, no symptoms)."], ["D) BCG vaccine now", "BCG is preventive vaccination for uninfected infants, not treatment of established infection."]]}, {"n": 57, "s": "A 14-year-old boy took a large paracetamol overdose 4 hours ago. He has mild nausea but no pain; the 4-hour paracetamol level is in the probable-toxicity range on the treatment nomogram. What is the correct treatment?", "o": [["A", "N-acetylcysteine infusion started now"], ["B", "Wait for liver enzymes tomorrow"], ["C", "Activated charcoal alone"], ["D", "Intravenous fluids only"]], "c": ["A)", "N-acetylcysteine infusion started now"], "co": "Paracetamol toxicity — NAC timing", "ct": "Interpretation", "w": "Paracetamol level plotted on the treatment nomogram above the line indicates risk of hepatotoxicity; IV N-acetylcysteine should begin immediately (within 8 h ideally) — waiting for transaminase rise forfeits the protective window.", "d": "Level above the nomogram line at 4 h (or 150 µg/mL at 4 h) → NAC immediately; never wait for LFT derangement — earliest NAC is most hepatoprotective", "t": "Timing trap — waiting for bloods", "f": "Paracetamol level above treatment line: NAC NOW; delay to morning LFTs is the classic preventable death.", "r": "Paracetamol overdose: plot level at ≥4 h on the Rumack-Matthew nomogram; treat above line with NAC (IV or oral) x 21 h/72 h; NAC also beneficial late.", "x": [["B) Wait for liver enzymes tomorrow", "Liver enzymes rise only after hepatocyte injury is underway; NAC is time-critical."], ["C) Activated charcoal alone", "Charcoal is only helpful within 1 h and alone is inadequate."], ["D) Intravenous fluids only", "IV fluids do not prevent paracetamol hepatotoxicity."]]}, {"n": 58, "s": "A 5-month-old with a large perimembranous ventricular septal defect has poor weight gain, tachypnoea and recurrent chest infections; echo shows a big left-to-right shunt. What is the correct approach?", "o": [["A", "Surgical closure (or device closure where suitable) for symptomatic large defect despite medical therapy"], ["B", "Wait until school age unconditionally"], ["C", "Give antibiotics only"], ["D", "Restrict fluids permanently"]], "c": ["A)", "Surgical closure (or device closure where suitable) for symptomatic large defect despite medical therapy"], "co": "VSD management in infancy", "ct": "Interpretation", "w": "Large symptomatic VSDs causing failure to thrive and recurrent chest infections despite optimal medical therapy (diuretics, nutrition, +/- ACE-inhibitor/antireflux) warrant closure in infancy; small defects are observed for spontaneous closure.", "d": "Large VSD + failure to thrive + recurrent infections = surgery now (medical failure); small defects may close spontaneously", "t": "Timing trap — delaying a correctable shunt", "f": "Large VSD + FTT/frequent LRTI = early closure; small restrictive VSD = observe, may close.", "r": "VSD: small/asymptomatic = observe; large symptomatic (FTT, infections) = surgical patch closure or device; monitor for Eisenmenger development if unrepaired.", "x": [["B) Wait until school age unconditionally", "Waiting until school age with failure to thrive and infections is harmful when closure is feasible in infancy."], ["C) Give antibiotics only", "Antibiotics do not address the haemodynamic burden."], ["D) Restrict fluids permanently", "Fluid restriction does not treat the shunt and risks poor growth further."]]}, {"n": 59, "s": "A 2-year-old with a mild croup-like cough for 2 days is brought distressed with stridor at rest, marked chest retractions, and SpO2 91% on room air after failed nebulised epinephrine and dexamethasone. What is the escalating step?", "o": [["A", "Repeat nebulised epinephrine, add heliox, consider intubation in ICU when obstruction is severe"], ["B", "Oral antibiotics"], ["C", "Chest physiotherapy"], ["D", "Discharge with reassurance and paracetamol"]], "c": ["A)", "Repeat nebulised epinephrine, add heliox, consider intubation in ICU when obstruction is severe"], "co": "Severe croup escalation", "ct": "Interpretation", "w": "Severe croup failing first-line epinephrine and dexamethasone warrants repeated nebulised epinephrine, observed care in ICU, heliox improves laminar airflow, and elective intubation (smaller tube) when exhaustion/hypoxia threatens; it is viral (usually para-influenza).", "d": "Stridor at rest + desaturation after epinephrine/steroid = severe croup: repeat epinephrine, heliox, ICU, possible intubation; antibiotics do not treat viral croup", "t": "Escalation trap — timidity after first-line failure", "f": "Croup failing epinephrine/dexamethasone with rest stridor + SpO2 ↓ = ICU, repeat epinephrine, heliox, intubation ready.", "r": "Croup: mild = single dexamethasone; moderate = nebulised epinephrine + dexamethasone; severe/failing = repeat epinephrine, heliox, ICU, intubation (uncuffed smaller tube).", "x": [["B) Oral antibiotics", "Antibiotics are ineffective in viral laryngotracheobronchitis."], ["C) Chest physiotherapy", "Physiotherapy does not relieve subglottic oedema."], ["D) Discharge with reassurance and paracetamol", "Desaturation with rest stridor is never a home-care disposition."]]}, {"n": 60, "s": "A 10-month-old, exclusively breastfed, presents with irritability, poor growth, frontal bossing, widening wrists and bowed legs; calcium 2.0 mmol/L, phosphate low, alkaline phosphatase markedly raised. X-ray shows cupping and fraying of metaphyses. What is the diagnosis and treatment?", "o": [["A", "Vitamin D deficiency rickets — vitamin D with calcium supplementation"], ["B", "Hypophosphatasia — enzyme replacement"], ["C", "Osteogenesis imperfecta — bisphosphonates"], ["D", "Scurvy — vitamin C"]], "c": ["A)", "Vitamin D deficiency rickets — vitamin D with calcium supplementation"], "co": "Nutritional rickets diagnosis and treatment", "ct": "Interpretation", "w": "Nutritional (vitamin D deficiency) rickets in an exclusively breastfed infant with limited sunlight presents with skeletal deformities, hypocalcaemia/hypophosphataemia, high ALP and cupped-frayed metaphyses; treatment is vitamin D (stoss or daily) with adequate calcium, plus sunlight and dietary education.", "d": "Bowed legs + frontal bossing + wrist widening + rachitic rosary + low calcium/phosphate + high ALP + metaphyseal cupping = vitamin D-deficient rickets", "t": "Rickets differential trap", "f": "Infant rickets triad: bowed legs + widened wrists + high ALP + cupped metaphyses → vitamin D + calcium.", "r": "Nutritional rickets: low calcium ± phosphate, high ALP, metaphyseal cupping/fraying; treat with vitamin D (e.g., 600,000 IU stoss or 800-2000 IU daily) plus elemental calcium; screen for hypocalcaemic seizures in severe cases.", "x": [["B) Hypophosphatasia — enzyme replacement", "Hypophosphatasia has LOW alkaline phosphatase — opposite of this picture."], ["C) Osteogenesis imperfecta — bisphosphonates", "Osteogenesis imperfecta causes recurrent fractures with blue sclerae, not metaphyseal cupping with high ALP."], ["D) Scurvy — vitamin C", "Scurvy causes bleeding gums/perifollicular haemorrhage and pseudoparalysis, without the wrist-cupping/ALP pattern."]]}, {"n": 61, "s": "A 14-month-old previously thriving boy has dropped from the 50th to the 10th centile for weight over 4 months despite good appetite. Examination shows no organomegaly, and there are no chronic symptoms. What is the single most important next evaluation step?", "o": [["A", "Detailed dietary history, social history and plotted growth review before labelling"], ["B", "Start appetite stimulants"], ["C", "Admit for total parenteral nutrition"], ["D", "Reassure that centile drift is normal at this age"]], "c": ["A)", "Detailed dietary history, social history and plotted growth review before labelling"], "co": "Growth faltering evaluation", "ct": "Analysis/Synthesis", "w": "Weight crossing two centile lines (e.g., 50th → 10th) defines growth faltering; evaluation begins with a detailed history of feeding, dietary intake, developmental and social factors (neglect, feeding behaviour, maternal health) and plotted serial growth, before investigations.", "d": "Crossing ≥2 major centile lines in weight = growth faltering; first step in the paediatric approach is shared history (feeding, family, social), not immediate admission or tests", "t": "History-first trap", "f": "Weight crossing 2+ centiles = faltering: take careful feeding/psychosocial history and observe a test feed before escalating tests.", "r": "Growth faltering: serial weight crossing centile lines; investigate diet, feeding dynamics, psychosocial factors, possible organic disease; repeated measures and a feeding observation guide first-line.", "x": [["B) Start appetite stimulants", "Appetite stimulants treat nothing and are not paediatric practice here."], ["C) Admit for total parenteral nutrition", "Admission and TPN are for severe failure with acute decompensation, not first-line for a well-appearing child."], ["D) Reassure that centile drift is normal at this age", "Crossing two major centile lines is not explained by normal variation at this age."]]}, {"n": 62, "s": "A 4-year-old with dengue shock syndrome has poor perfusion, weak pulses, and a narrow pulse pressure after 40 mL/kg of crystalloids. What is the correct escalation?", "o": [["A", "Give a bolus of colloid or additional crystalloid, reassess haematocrit and clinical status repeatedly; do not transfuse based on haemoconcentration alone"], ["B", "Immediate blood transfusion"], ["C", "Inotrope infusion only"], ["D", "Furosemide to offload"]], "c": ["A)", "Give a bolus of colloid or additional crystalloid, reassess haematocrit and clinical status repeatedly; do not transfuse based on haemoconcentration alone"], "co": "Dengue shock management — refractory shock", "ct": "Analysis/Synthesis", "w": "Dengue shock is hypovolaemic from plasma leakage; after the first 40 mL/kg, persistent shock warrants further fluid (crystalloid or colloid), guided by serial haematocrit and clinical response — blood products are reserved for bleeding/falling Hb, not for haemoconcentration, and diuretics worsen the hypovolaemic state.", "d": "Compensated shock in dengue → crystalloid 10-20 mL/kg; refractory → second crystalloid/colloid bolus with repeated Hct-guided reassessment; transfusion only if bleeding/haemoglobin falls", "t": "Fluid-and-blood decision trap in dengue", "f": "Dengue shock: serial Hct-guided fluid boluses; colloid if refractory; transfuse only with bleeding/falling Hb despite rising Hct.", "r": "DSS: rapidly correct hypovolaemia with isotonic crystalloid 10-20 mL/kg ×2; if unresponsive, colloid 10-20 mL/kg; monitor Hct, urine output, vitals; avoid overhydration in the recovery phase.", "x": [["B) Immediate blood transfusion", "Transfusion in haemoconcentrated shock risks worsening viscosity; only for overt bleeding or falling Hb."], ["C) Inotrope infusion only", "Inotropes are adjunct in refractory hypotensive shock after volume, not a substitute for volume."], ["D) Furosemide to offload", "Diuretics are contraindicated in the leak phase of dengue shock."]]}, {"n": 63, "s": "A 2-year-old girl has 2 days of watery diarrhoea. She is lethargic, with sunken eyes, dry mucosa, slow skin pinch, and a palpable radial pulse. She has not passed urine for 8 hours. How much deficit does she have and what is the first step?", "o": [["A", "10% dehydration — IV bolus 20 mL/kg crystalloid then reassess"], ["B", "5% dehydration — start ORS at home"], ["C", "15% dehydration — urgent blood transfusion"], ["D", "2% dehydration — reassure mother"]], "c": ["A)", "10% dehydration — IV bolus 20 mL/kg crystalloid then reassess"], "co": "Dehydration classification and shock management", "ct": "Interpretation", "w": "Two or more of lethargy, sunken eyes, dry mucosa, slow skin pinch, and no urine define severe dehydration (≥10%), which in the presence of a weak radial pulse/shock warrants IV fluid bolus (20 mL/kg isotonic crystalloid) with reassessment — ORS is unsafe in shock.", "d": "Lethargy + sunken eyes + dry mucosa + slow skin pinch + no urine 8h = severe (≥10%) dehydration; the child with signs of shock gets an IV bolus, not ORS", "t": "Number trap — dehydration grading", "f": "Severe dehydration = ≥2 signs (lethargy, sunken eyes, dry mucosa, slow pinch) ± no urine: IV bolus 20 mL/kg, reassess; never ORS in shock.", "r": "WHO dehydration plan C: severe dehydration → IV Ringer lactate 100 mL/kg (20 mL/kg bolus first, reassess) over 4-6 h; plan B ORS for some dehydration; plan A home ORS.", "x": [["B) 5% dehydration — start ORS at home", "Some dehydration (5%) has fewer signs and a normal urine output; this child is in shock territory."], ["C) 15% dehydration — urgent blood transfusion", "Blood transfusion is not first-line for hypovolaemic dehydration unless there is severe anaemia/haemorrhage."], ["D) 2% dehydration — reassure mother", "The lethargy, sunken eyes, slow pinch and oliguria objectively grade far beyond 2%."]]}, {"n": 64, "s": "A 15-year-old girl with severe calorie restriction and excessive exercise has body mass index 15, heart rate 42, and cold peripheries. Her mother worries about 'just being diet-conscious'. Which finding is the strongest argument that this is a medical emergency requiring admission?", "o": [["A", "Marked bradycardia with risk of arrhythmia"], ["B", "Desire to lose weight"], ["C", "School performance decline"], ["D", "Preference for salads"]], "c": ["A)", "Marked bradycardia with risk of arrhythmia"], "co": "Anorexia nervosa — medical instability criteria", "ct": "Interpretation", "w": "In anorexia nervosa, bradycardia below 45-50 bpm, orthostatic instability, electrolyte disturbance, hypoglycaemia or very low BMI indicate medical instability and risk of arrhythmia/refeeding syndrome; admission with monitored refeeding is required.", "d": "Severe malnutrition + bradycardia (<45) = medical instability (refeeding/arrhythmia risk) → admission; the diagnosis is eating disorder, not dieting", "t": "Medical-stability classification trap", "f": "AN + HR <45, orthostatic changes, hypokalaemia, or BMI <15 = admit; watch refeeding syndrome (phosphate).", "r": "Anorexia nervosa admission criteria: HR <45 (or <50 with orthostasis), BP <80/50, electrolyte disturbance, hypoglycaemia, acute food refusal, very low BMI <70% median, SSB; refeeding with careful phosphate monitoring.", "x": [["B) Desire to lose weight", "Weight concern is a diagnostic feature, not a severity criterion."], ["C) School performance decline", "School decline reflects psychosocial impact but is not the acute admission driver."], ["D) Preference for salads", "Food choice alone does not define medical instability."]]}, {"n": 65, "s": "A 12-hour-old term infant has recurrent focal clonic seizures. Bedside glucose is 1.8 mmol/L which corrects with a dextrose bolus infusion, yet he seizes again. Examination is otherwise unremarkable; calcium and magnesium are pending. What is the next most appropriate step after confirming normoglycaemia?", "o": [["A", "Evaluate seizure aetiology systematically — check calcium/magnesium, add an anticonvulsant (phenobarbital) for ongoing seizures, and consider HIE/infection/metabolic causes"], ["B", "Discharge home"], ["C", "Stop all feeds and wait"], ["D", "Give only oral diazepam"]], "c": ["A)", "Evaluate seizure aetiology systematically — check calcium/magnesium, add an anticonvulsant (phenobarbital) for ongoing seizures, and consider HIE/infection/metabolic causes"], "co": "Neonatal seizure workup and treatment", "ct": "Analysis/Synthesis", "w": "Neonatal seizures are a symptom, not a diagnosis: after treating hypoglycaemia, hypocalcaemia and hypomagnesaemia, sepsis/meningitis (LP), hypoxic-ischaemic encephalopathy and metabolic/inborn errors must be considered; phenobarbital is the first-line anticonvulsant for ongoing seizures.", "d": "Neonatal seizure not resolved by glucose correction = pursue electrolyte/metabolic/structural/infective causes; phenobarbital is first-line anticonvulsant", "t": "Symptom-identification trap", "f": "Neonatal seizure: glucose → calcium/magnesium → LP → HIE/metabolic; phenobarbital first-line anticonvulsant.", "r": "Neonatal seizure evaluation: bedside glucose, calcium, magnesium, sodium; sepsis screen + LP; aEEG/EEG; imaging when stable; treat underlying cause and phenobarbital (20 mg/kg load) for recurrent seizures.", "x": [["B) Discharge home", "Recurrent seizures with ongoing cause are never a discharge situation."], ["C) Stop all feeds and wait", "Stopping feeds without identifying the cause risks metabolic decompensation and hypoglycaemia recurrence."], ["D) Give only oral diazepam", "Oral diazepam is not first-line for neonatal seizures."]]}, {"n": 66, "s": "A 3-year-old boy has 6 days of fever, bilateral non-exudative conjunctivitis, cracked lips, strawberry tongue, and a generalised polymorphous rash; no cervical lymphadenopathy. CRP and ESR are high; echocardiography shows normal coronaries today. What is the correct next step?", "o": [["A", "Treat as incomplete Kawasaki disease — IVIG and aspirin within 10 days of fever"], ["B", "Observe only until the rash resolves"], ["C", "Start corticosteroids alone"], ["D", "Discharge as viral illness"]], "c": ["A)", "Treat as incomplete Kawasaki disease — IVIG and aspirin within 10 days of fever"], "co": "Incomplete Kawasaki disease recognition", "ct": "Interpretation", "w": "Incomplete Kawasaki is suspected with fever ≥5 days plus fewer than 4 classic criteria when inflammatory markers are elevated; IVIG + aspirin within 10 days reduces coronary aneurysm risk and normal coronaries on day 6 do not exclude the diagnosis.", "d": "Fever ≥5 days + 3-4 clinical features + inflammatory markers = incomplete Kawasaki; echocardiography does not rule it out early — treat to prevent coronary aneurysms", "t": "Diagnosis-miss trap — incomplete KD with normal echo", "f": "Fever ≥5 days + ≥2-3 KD signs + elevated markers = incomplete KD: IVIG + aspirin, repeat echo at 2 and 6 weeks.", "r": "KD criteria: fever ≥5 days + 4 of 5 features (conjunctivitis, mucositis, rash, cervical node ≥1.5 cm, extremity changes); incomplete KD with complementary criteria + echo; IVIG 2 g/kg + aspirin; steroid only IVIG-resistant.", "x": [["B) Observe only until the rash resolves", "Observation forfeits the 10-day therapeutic window; coronary damage is the preventable outcome."], ["C) Start corticosteroids alone", "Corticosteroids are reserved for IVIG-resistant disease, not first-line."], ["D) Discharge as viral illness", "A fever unresponsive to antibiotics with mucocutaneous features and high inflammatory markers is not a benign viral illness to discharge."]]}, {"n": 67, "s": "A 16-month-old boy has a generalised tonic-clonic seizure lasting 3 minutes with fever 39°C, on the first day of an upper respiratory infection. He is fully recovered in the emergency room, with a normal neurological examination. Which statement is correct?", "o": [["A", "Simple febrile seizure — reassure, no routine neuroimaging or EEG, child likely to outgrow"], ["B", "Complex febrile seizure — urgent MRI"], ["C", "Epilepsy — start long-term anticonvulsant now"], ["D", "Meningitis — lumbar puncture mandatory"]], "c": ["A)", "Simple febrile seizure — reassure, no routine neuroimaging or EEG, child likely to outgrow"], "co": "Simple febrile seizure evaluation", "ct": "Analysis/Synthesis", "w": "A generalised febrile seizure under 15 minutes in a child fully recovered with normal neuro exam is simple; evaluation targets the source of fever, and routine neuroimaging, EEG and lumbar puncture (without meningeal signs) are not indicated; most children outgrow them by school age.", "d": "Generalised seizure <15 min, single in 24 h, age 6-60 months, full recovery = simple febrile seizure; no routine LP/EEG/imaging; excellent prognosis", "t": "Over-investigation trap", "f": "Simple febrile seizure: treat the fever source, no routine LP/EEG/CT; counsel recurrence risk (~30%) and reassure re epilepsy.", "r": "Simple febrile seizure: generalised, <15 min, once per 24 h, age 6-60 months, normal neuro exam = no routine LP (unless meningeal signs), no EEG/MRI, no anticonvulsant prophylaxis.", "x": [["B) Complex febrile seizure — urgent MRI", "Complex features (focal, >15 min, repeated in 24 h) would prompt further evaluation, but this is simple."], ["C) Epilepsy — start long-term anticonvulsant now", "A febrile seizure is not epilepsy; no long-term anticonvulsants."], ["D) Meningitis — lumbar puncture mandatory", "Lumbar puncture is reserved for meningeal signs, suspected sepsis, or infants with equivocal examination."]]}, {"n": 68, "s": "A 17-year-old girl took an overdose of iron tablets 6 hours ago. She has vomiting, abdominal pain, severe metabolic acidosis and hyperglycaemia; abdominal X-ray shows radio-opaque tablets in the gut. What is the specific treatment?", "o": [["A", "IV deferoxamine infusion"], ["B", "N-acetylcysteine"], ["C", "Sodium bicarbonate alone"], ["D", "Whole-bowel irrigation with plain water only"]], "c": ["A)", "IV deferoxamine infusion"], "co": "Iron poisoning — deferoxamine", "ct": "Interpretation", "w": "Iron poisoning with systemic toxicity (acidosis, hyperglycaemia, shock) requires IV deferoxamine chelation; N-acetylcysteine is the paracetamol antidote; whole-bowel irrigation with polyethylene glycol can remove tablets but never replaces chelation in established toxicity.", "d": "Severe metabolic acidosis + shock + radio-opaque tablets + vomiting = significant iron toxicity; chelation with deferoxamine is the antidote", "t": "Antidote-matching trap", "f": "Iron overdose + acidosis/hyperglycaemia/shock: deferoxamine IV; NAC is for paracetamol.", "r": "Iron poisoning: deferoxamine for systemic toxicity (peak iron >500 µg/dL, acidosis, shock); supportive fluids and serum iron levels; WBI with PEG for decontamination adjunct.", "x": [["B) N-acetylcysteine", "NAC treats paracetamol overdose, not iron."], ["C) Sodium bicarbonate alone", "Bicarbonate corrects acidosis but does not remove iron."], ["D) Whole-bowel irrigation with plain water only", "WBI alone is decontamination, insufficient when chelation is indicated."]]}, {"n": 69, "s": "A 4-year-old boy has bloody diarrhoea for 4 days, then becomes pale and oliguric; Hb 7.1, platelets 35,000, creatinine 2.4, fragmented red cells on smear. Which management is potentially harmful here?", "o": [["A", "Supportive care with careful fluid balance and transfusion if symptomatic"], ["B", "Antibiotics and anti-motility drugs for the presumed ongoing enteritis"], ["C", "Monitor electrolytes daily"], ["D", "Dialysis for anuria"]], "c": ["B)", "Antibiotics and anti-motility drugs for the presumed ongoing enteritis"], "co": "Haemolytic uraemic syndrome — antibiotics worsen outcome", "ct": "Analysis/Synthesis", "w": "Typical HUS follows Shiga-toxin-producing E. coli (STEC); antibiotics and antimotility agents are associated with worse renal and neurological outcomes; management is supportive (fluids, electrolytes, transfusion, dialysis as needed).", "d": "Bloody diarrhoea → anaemia + thrombocytopenia + AKI = HUS; antibiotics and antimotility agents increase toxin release and worsen disease", "t": "Never-do trap — antibiotics in STEC", "f": "D+ HUS: no antibiotics, no antimotility; supportive care + dialysis when oliguric.", "r": "HUS: triad of microangiopathic haemolytic anaemia, thrombocytopenia, AKI after bloody diarrhoea; avoid antibiotics/antimotility; supportive; dialysis indications standard.", "x": [["A) Supportive care with careful fluid balance and transfusion if symptomatic", "Supportive care is the correct mainstay of HUS management."], ["C) Monitor electrolytes daily", "Electrolyte monitoring is mandatory in AKI with renal failure."], ["D) Dialysis for anuria", "Dialysis is indicated for anuria/fluid overload/electrolyte crisis."]]}, {"n": 70, "s": "A 2-year-old drank kerosene from a bottle thirty minutes ago. He is coughing but conscious and protecting his airway, with mild tachypnoea. What is the correct immediate management?", "o": [["A", "Do not induce vomiting; observe/respiratory support with chest X-ray as indicated"], ["B", "Induce vomiting with syrup of ipecac immediately"], ["C", "Gastric lavage with a large-bore tube"], ["D", "Activated charcoal"]], "c": ["A)", "Do not induce vomiting; observe/respiratory support with chest X-ray as indicated"], "co": "Hydrocarbon ingestion — aspiration prevention", "ct": "Analysis/Synthesis", "w": "Hydrocarbon ingestion (kerosene) injures by aspiration; vomiting, gastric lavage and activated charcoal all increase aspiration risk and worsen chemical pneumonitis — management is supportive, avoiding emesis, with oxygen and chest X-ray when respiratory signs exist.", "d": "Kerosene/hydrocarbons = aspiration pneumonitis risk; never induce vomiting, no lavage/charcoal; support respiration", "t": "Never-do trap — decontamination in hydrocarbons", "f": "Kerosene: NO ipecac/lavage/charcoal; observe respiration; X-ray only if symptoms; risk of pneumonitis highest in first hours.", "r": "Hydrocarbon poisoning: supportive care, avoid induced vomiting and gastric decontamination, monitor respiratory status, antibiotics only for superinfection, admit if symptomatic.", "x": [["B) Induce vomiting with syrup of ipecac immediately", "Induced vomiting aspirates the hydrocarbon directly into the lungs — the classic harmful intervention."], ["C) Gastric lavage with a large-bore tube", "Gastric lavage is contraindicated due to aspiration risk."], ["D) Activated charcoal", "Activated charcoal does not adsorb hydrocarbons and risks aspiration."]]}], "c": 70}}

Test Series 2026