MedCORE Reference

Pediatrics

High-yield algorithms, recognition patterns, and exam traps — built for rapid last-minute recall.

Dr. Ahmad Zafar 2025 16 Sections

This MedCORE is not a medical textbook. It is only designed for rapid, last-minute recall and should be treated like a high-yield cheat sheet, not a complete learning resource. Use it to memorize critical algorithms and recognition patterns.

1.1Neonatology
1.2Growth & Development
1.3Nutrition
1.4Infectious Diseases
1.5Neurology
1.6Respiratory & Allergy
1.7Congenital Heart Diseases
1.8Hematology
1.9Nephrology
1.10Endocrine
1.11Viva Topics
1.12Exam Scenarios
1.13Bonus: Power Numbers, Buzzwords & Rapid-Fire MCQs
1.15MCQ Practice Session
1.16Answer Key & Full Breakdown

Section 1.1

Neonatology

1.1 APGAR Score — Most Asked in Vivas

Score	Appearance	Pulse	Grimace	Activity	Respiration
0	Blue/pale	Absent	No response	Limp	Absent
1	Body pink, extremities blue	<100 bpm	Grimace/weak cry	Some flexion	Slow, irregular
2	Completely pink	>100 bpm	Cry/cough/sneeze	Active movement	Good, crying

Timing: 1 minute and 5 minutes after birth.

APGAR Total	Interpretation
7–10	Normal
4–6	Moderately depressed (needs stimulation, O₂)
0–3	Severely depressed (needs immediate resuscitation)

Exam Trap

APGAR is NOT used to decide when to start resuscitation. If the baby is not breathing at birth, start resuscitation immediately — do not wait for the APGAR.

APGAR Timing & Prognostic Significance

Time	Purpose
1 minute	Determines need for immediate resuscitation
5 minutes	Assesses response to resuscitation
10 minutes	Strongly predictive of neurological outcome if still low

Sarnat Staging of Hypoxic-Ischemic Encephalopathy (HIE)

Stage	Level	Key Features	Prognosis
1	Mild	Hyperalert, jittery, normal tone, no seizures	Good
2	Moderate	Lethargic, hypotonic, seizures, abnormal EEG	Variable
3	Severe	Comatose, flaccid, absent reflexes, brainstem signs	Poor

Therapeutic Hypothermia for HIE

Indication: Moderate to severe HIE (Sarnat stage 2–3) in infants ≥36 weeks gestation
Method: Whole-body cooling to 33.5°C for 72 hours, then slow rewarming
Time window: Must be initiated within 6 hours of birth
Reduces: Mortality and neurodevelopmental disability at 18–24 months
Monitoring: Continuous temperature, vitals, EEG, and lab monitoring during cooling

1.2 Neonatal Resuscitation — Golden Minute Algorithm

BIRTH
Warm, dry, stimulate — 30 sec
Assess: Breathing? HR >100?
YES → Routine care with mother
NO → Start PPV (positive pressure ventilation)
30 sec PPV → Check HR
HR >100 → Continue PPV
HR <100 → Check ventilation, reposition, suction
Still HR <60 after 30 sec effective PPV?
→ Start CHEST COMPRESSIONS + PPV (3:1)
After 60 sec, check HR
HR still <60 → EPINEPHRINE

Key Points for the Exam

Initial steps (30 sec): Dry, warm, position, suction (mouth then nose), stimulate
Ventilation: Room air first (NOT 100% O₂) — prevents retinopathy of prematurity
Compression technique: Two-thumb encircling hands method
Compression depth: 1/3 of chest depth
Epinephrine dose: 0.01–0.03 mg/kg IV (0.1–0.3 mL/kg of 1:10,000)
Meconium: Vigorous baby → No suction. Depressed baby → Intubation + suction

Viva Traps

"When do you start resuscitation?" → Immediately if not breathing; do not wait for APGAR
"What O₂ concentration?" → Start with room air (21%), increase if needed
"Meconium in vigorous baby?" → No suction needed (routine care)

1.3 Neonatal Jaundice — Classification is Key

Core Concept

Jaundice becomes visible when bilirubin >5 mg/dL. The key to the exam is distinguishing physiological from pathological.

Feature	Physiological	Pathological
Onset	After 24 hours	Within 24 hours
Peak	Day 3–5	Variable
Duration	<2 weeks	>2 weeks
Bilirubin rise	<5 mg/dL/day	>5 mg/dL/day OR >15 mg/dL
Type	Unconjugated	Can be conjugated
Clinical state	Well baby	May be sick

Danger Signs — Investigate Immediately

Jaundice in first 24 hours (ALWAYS pathological)
Total bilirubin >15 mg/dL
Conjugated bilirubin >2 mg/dL (or >20% of total)
Jaundice persisting >2 weeks
Sick baby (lethargy, poor feeding, fever)

Causes by Timing

<24 hours (Pathological)	24–72 hours	>2 weeks (Prolonged)
Hemolytic disease: ABO/Rh incompatibility, G6PD deficiency, hereditary spherocytosis	Physiological (most common); Breastfeeding jaundice (inadequate feeding); Polycythemia; Cephalohematoma / bruising (reabsorption)	Breast milk jaundice (breast-fed, well baby); Hypothyroidism (screening!); Biliary atresia (pale stools, dark urine, conjugated); Galactosemia; Sepsis / UTI

Investigations

Basic workup: Total and direct (conjugated) bilirubin; mother & baby blood group + Coombs test; CBC (anemia, reticulocytes); peripheral smear (spherocytes, fragmented cells)
If conjugated hyperbilirubinemia: LFTs; ultrasound abdomen (biliary atresia); TORCH screening; urine for reducing substances (galactosemia)
If severe unconjugated: G6PD levels; septic workup

Management

Phototherapy (term baby): Use hour-specific bilirubin nomogram; generally start at >15 mg/dL (24–48 h). Blue-green light, 460–490 nm; distance 10–15 cm; maximal skin exposure, cover eyes
Exchange transfusion: Bilirubin >25 mg/dL or >5 mg/dL below the exchange line
IVIG 0.5–1 g/kg: Isoimmune hemolytic disease not responding to phototherapy
Phenobarbitone: Induces conjugation (limited role)
Metalloporphyrins: Inhibit heme oxygenase (experimental)

1.4 Birth Injuries

Injury	Risk Factor	Key Feature
Caput succedaneum	Vertex delivery	Soft, crosses suture lines, resolves in days
Cephalohematoma	Instrumental delivery	Firm, does NOT cross suture lines, resolves in weeks–months
Subgaleal hemorrhage	Vacuum delivery	Life-threatening: boggy scalp, crosses suture lines, can cause shock
Erb-Duchenne palsy	Shoulder dystocia	C5–C6: waiter's tip posture, loss of shoulder abduction
Klumpke palsy	Breech/arm traction	C8–T1: claw hand, Horner syndrome if T1 involved
Fractured clavicle	Shoulder dystocia	Most common fracture, pseudoparalysis, crepitus
Facial nerve palsy	Forceps delivery	Asymmetric crying facies, forehead sparing

1.5 Rh Incompatibility & TORCH Infections

Rh Incompatibility

Pathophysiology: Rh−ve mother, Rh+ve baby → maternal anti-D antibodies cross placenta → hemolysis
First pregnancy: Usually unaffected (sensitization occurs at delivery)
Subsequent pregnancies: Progressive severity — hydrops fetalis, kernicterus
Prevention: Anti-D immunoglobulin at 28 weeks + within 72 hours of delivery

TORCH Infections

Infection	Key Features
Toxoplasmosis	Cat feces, undercooked meat; intracranial calcifications, hydrocephalus, chorioretinitis
Rubella	Congenital: PDA, deafness, cataracts, "blueberry muffin" rash; + maternal rash in pregnancy
CMV	Most common congenital infection; microcephaly, periventricular calcifications, SNHL, PETAL
Herpes (HSV)	Vesicular rash, encephalitis, disseminated disease; C-section if active lesions
Syphilis	Saddle nose, Hutchinson teeth, saber shins, rhinitis; treat with penicillin

1.6 Neonatal Respiratory Distress

Cause	Onset	Key Feature
Hyaline Membrane Disease (HMD / RDS)	Immediate (preterm)	Surfactant deficiency, ground-glass CXR, air bronchograms
Transient Tachypnea of Newborn (TTN)	Hours (term/C-section)	Benign, self-limited, fluid in fissures on CXR
Meconium Aspiration Syndrome	At birth (post-term)	Meconium-stained liquor, chemical pneumonitis, coarse CXR opacities
Congenital Pneumonia	First days	Sepsis features, focal CXR changes
Congenital Heart Disease	Variable	Cyanosis, cardiomegaly, abnormal CXR/echo

HMD / RDS — Recognition Pattern

Risk: Preterm, C-section, maternal diabetes, male
Presentation: Tachypnea, grunting, nasal flaring, intercostal retractions, cyanosis
CXR: Ground-glass appearance + air bronchograms
Management: Surfactant replacement, CPAP, mechanical ventilation if needed
Antenatal prevention: Betamethasone 12 mg IM ×2 doses, 24 h apart, to mother at risk of preterm delivery

1.7 Neonatal Hypoglycemia

Definition

At-risk infants: Blood glucose <45 mg/dL (2.6 mmol/L)
Term healthy: <40 mg/dL in first 4 hours, <45 mg/dL after

At-risk infants: Prematurity / SGA / IUGR; infant of diabetic mother; perinatal stress (asphyxia, sepsis); polycythemia, Beckwith-Wiedemann syndrome.

Management

Asymptomatic: Early feeding + monitor glucose
Symptomatic / severe (<25 mg/dL): IV 2 mL/kg 10% dextrose bolus, then dextrose infusion at 6–8 mg/kg/min
Target: Glucose >45 mg/dL before feeds

Section 1.2

Growth & Development

2.1 Weight, Height, Head Circumference

Parameter	Birth	3 mo	6 mo	9 mo	1 yr	2 yr
Weight (kg)	3.2–3.5	6	7.5	8.5	9–10	12
Height (cm)	50	60	65	70	75	85–87
HC (cm)	34–35	40	43	45	46–47	48–49

Weight doubles by 5 months, triples by 1 year, quadruples by 2 years. HC increases ~10 cm in the first year (2 cm/month 0–3 mo, 1 cm/month 3–6 mo, 0.5 cm/month after 6 mo).

2.2 Developmental Milestones

Exam Tip

Examiners love asking: "What should a child do at X months?" Memorize the key ages below.

Age	Gross Motor	Fine Motor	Language	Social
6 weeks	Lifts head briefly	Follows objects	Coos	Social smile
3 months	Head control	Grasps rattle	Coos, turns to voice	Recognizes mother
6 months	Sits with support	Transfers hand-to-hand	Babbles	Stranger anxiety begins
9 months	Sits without support, crawls	Pincer grasp	Mama/dada (non-specific)	Stranger anxiety, peek-a-boo
12 months	Stands alone, may walk	Castanet (bangs objects)	2–3 words (meaningful)	Waves bye-bye, object permanence
18 months	Walks well, runs	Tower of 3–4 cubes	10–20 words	Feeds self with spoon
2 years	Kicks ball, climbs stairs	Tower of 6–7 cubes	2-word sentences (50+ words)	Parallel play, points to body parts
3 years	Rides tricycle	Copies circle	3-word sentences	Knows name/age, cooperative play
4 years	Hops on one foot	Copies cross, draws person	Tells stories	Dresses independently, cooperative play
5 years	Skips	Copies triangle, writes name	Counts to 10, fluent	Dresses independently, plays with rules

Red Flags (Developmental Delay)

No social smile by 2 months
No head control by 4 months
No sitting by 9 months
No crawling by 12 months
No walking by 18 months
No words by 18 months
Loss of previously acquired milestones (regression)

2.3 Puberty & Growth

Event	Girls	Boys
First sign	Breast bud (thelarche): 8–13 yr	Testicular enlargement: 9–14 yr
Growth spurt peak	11–12 yr	13–14 yr
Menarche / Spermarche	12–13 yr	13–14 yr
Precocious puberty	<8 yr	<9 yr
Delayed puberty	No signs by 13 yr	No signs by 14 yr

Mid-Parental Height Calculation

Boys: (Father's height + Mother's height + 13 cm) / 2
Girls: (Father's height + Mother's height − 13 cm) / 2
Target range: ±8.5 cm

Section 1.3

Nutrition

3.1 Breastfeeding

Exclusive breastfeeding: First 6 months (no water, no other milk)
Colostrum: First milk — rich in IgA, proteins, vitamins
On-demand feeding: 8–12 feeds per day
Benefits: Reduces infection risk, promotes bonding, lower SIDS, maternal postpartum recovery
Contraindications: HIV (in developed countries), active untreated TB, drugs (chemotherapy, radioactive), galactosemia in baby
Complementary feeding: Start at 6 months with iron-rich foods

3.2 Vitamin Deficiencies

Vitamin	Deficiency Disease	Key Features
A	Xerophthalmia, night blindness	Bitot spots, keratomalacia, corneal ulceration; preventable blindness
B1 (Thiamine)	Beriberi	Wet: HF, edema; Dry: neuropathy, Wernicke encephalopathy
B3 (Niacin)	Pellagra	Dermatitis, Dementia, Diarrhea (3 D's)
B6 (Pyridoxine)	Neuropathy, anemia	Microcytic anemia, infant seizures, irritability
B9 (Folate)	Megaloblastic anemia	Neural tube defects in pregnancy, glossitis
B12	Pernicious anemia	Megaloblastic anemia, subacute combined degeneration of cord
C	Scurvy	Bleeding gums, perifollicular hemorrhages, impaired wound healing, pseudoparalysis
D	Rickets	Bone deformities (bow legs, rachitic rosary, Harrison sulcus), hypocalcemia
E	Hemolytic anemia	In preterm infants, neuropathy, retinopathy
K	Hemorrhagic disease	Give at birth to prevent VKDB

Rickets — Focus Points

Cause: Vitamin D deficiency (lack of sunlight, exclusive breastfeeding without supplement)
Features: Craniotabes, frontal bossing, rachitic rosary, Harrison sulcus, bow legs, widened wrist/ankle
Treatment: Vitamin D 600,000 IU IM single dose or 300,000 IU orally + calcium
Prevention: Daily vitamin D 400 IU for all breastfed infants

3.3 Protein-Energy Malnutrition

Feature	Marasmus	Kwashiorkor
Deficiency	Calories (protein + energy)	Primarily protein
Age	<1 year	>1 year (usually 1–3 yr)
Appearance	Severely wasted	Edematous
Subcutaneous fat	Absent	Present (but reduced)
Edema	Absent	Present (pitting)
Skin/hair	Loose skin folds	Dermatitis, flag sign (hair discoloration)
Liver	Normal	Hepatomegaly (fatty)
Psychiatric	Irritable	Apathetic, miserable

Management Principles

STABILIZATION (phase 1): Correct dehydration carefully (ReSoMal or low-Na solutions), treat infections, correct hypoglycemia/hypothermia
REHABILITATION (phase 2): Start F-75 formula (75 kcal/100 mL), then transition to F-100 (100 kcal/100 mL) for catch-up growth
Feeding schedule: Frequent small feeds (every 2–3 h), avoid overloading
Micronutrients: Vitamin A, folate, zinc, copper, iron (iron only in rehabilitation phase)

Section 1.4

Infectious Diseases

4.1 Measles

Recognition Pattern

3 C's: Cough, Coryza, Conjunctivitis + Fever + Maculopapular rash

Feature	Detail
Agent	Paramyxovirus (RNA)
Incubation	10–12 days
Prodrome	3 C's + Koplik spots (white spots on buccal mucosa, pathognomonic)
Rash	Erythematous maculopapular, starts behind ears → face → trunk → extremities, becomes brownish
Complications	Pneumonia (most common cause of death), encephalitis (SSPE years later), otitis media, diarrhea
Management	Supportive; Vitamin A (reduces severity/mortality); no specific antiviral
Prevention	Measles vaccine at 9 months (1st dose), 15 months (2nd dose)
Notification	NOTIFIABLE disease

Viva Trap

"Koplik vs Forchheimer spots?" → Koplik = measles (buccal mucosa); Forchheimer = rubella (soft palate)
"Vitamin A in measles?" → Yes: reduces morbidity and mortality, once daily for 2 days

4.2 Rubella (German Measles)

Feature	Detail
Agent	Rubella virus (RNA)
Prodrome	Mild fever, lymphadenopathy (suboccipital, post-auricular), arthralgia
Rash	Fine maculopapular, starts on face, spreads rapidly, fades in 3 days
Forchheimer spots	Petechiae on soft palate (pathognomonic)
Congenital rubella	Triad: Cataracts, Deafness, PDA + IUGR, "blueberry muffin" rash
Management	Supportive; prevention through vaccination (MMR at 12–15 months)

4.3 Chickenpox (Varicella)

Feature	Detail
Agent	Varicella-zoster virus (DNA, herpes family)
Incubation	14–16 days
Rash	Crops of vesicles at different stages (macule → papule → vesicle → crust) "dew drops on rose petals"
Distribution	Centripetal (more on trunk, less on extremities), includes scalp and mucosa
Complications	Secondary bacterial infection, pneumonia (esp. adults), encephalitis, Reye syndrome (with aspirin)
Management	Symptomatic; NO aspirin (Reye syndrome); Acyclovir if severe/immunocompromised
Prevention	Varicella vaccine; VZIG for exposed immunocompromised/neonates

Reye Syndrome: Aspirin + viral illness (chickenpox/influenza) → acute encephalopathy + fatty liver. Never give aspirin to children with viral infections.

4.4 Scarlet Fever

Feature	Detail
Agent	Group A Streptococcus (Streptococcus pyogenes)
Toxin	Erythrogenic toxin
Presentation	Fever, sore throat, strawberry tongue, sandpaper rash, Pastia lines
Rash	Fine erythematous, blanching, starts on trunk, desquamates after 1 week
Management	Penicillin V or Amoxicillin for 10 days (prevents rheumatic fever)

4.5 Kawasaki Disease

Critical — Diagnostic Criteria (fever + 4 of 5)

1. Fever >5 days (high, remittent)
2. Conjunctivitis (bilateral, non-exudative)
3. Oral changes: strawberry tongue, red/cracked lips, pharyngeal erythema
4. Polymorphous rash (truncal)
5. Extremity changes: erythema/edema of hands/feet, periungual desquamation (late)
+ Cervical lymphadenopathy (>1.5 cm, usually unilateral)

Test	Finding
Age	Usually <5 years
Platelets	Thrombocytosis (increased in subacute phase)
ESR/CRP	Markedly elevated
Echocardiogram	Coronary artery aneurysms (most serious complication)

Management

IVIG: 2 g/kg single dose within 10 days (reduces coronary aneurysm risk)
High-dose aspirin: 80–100 mg/kg/day q6h (anti-inflammatory) then low-dose 3–5 mg/kg/day (antiplatelet)
Follow-up: Echo at diagnosis, 2 weeks, 6–8 weeks

4.6 Pertussis (Whooping Cough)

Feature	Detail
Agent	Bordetella pertussis (Gram − coccobacillus)
Catarrhal stage	1–2 wk: coryza, mild cough, highly infectious
Paroxysmal stage	2–4 wk: paroxysms + inspiratory whoop + post-tussive vomiting; apnea in infants
Convalescent stage	Gradual recovery over weeks to months
Diagnosis	Nasopharyngeal swab PCR/culture; leukocytosis with lymphocytosis
Management	Macrolide: Azithromycin 10 mg/kg/day ×5 d or Clarithromycin 15 mg/kg/day ×7 d
Prevention	Pentavalent/DTaP vaccine (6, 10, 14 wk + boosters)

4.7 Diphtheria

Feature	Detail
Agent	Corynebacterium diphtheriae (Gram + bacillus)
Toxin	Exotoxin inhibits protein synthesis → myocarditis, neuritis
Presentation	Sore throat, low-grade fever, "bull neck", pseudomembrane (gray, adherent, bleeds on removal)
Airway	Pseudomembrane can obstruct → tracheostomy may be needed
Management	Antitoxin (equine) + Penicillin or Erythromycin
Prevention	Pentavalent/DTaP vaccine

4.8 Tetanus

Feature	Detail
Agent	Clostridium tetani (Gram + spore-forming anaerobe)
Toxin	Tetanospasmin → blocks inhibitory neurotransmitters → rigidity and spasms
Presentation	Trismus (lockjaw), risus sardonicus, opisthotonus, spasms triggered by stimuli
Neonatal tetanus	Unclean cord cutting; "3-month disease" in Pakistan: refusal to feed, rigidity, spasms
Management	HTIG 500 IU IM + Metronidazole 30 mg/kg/day IV + wound debridement
Prevention	Pentavalent/DTaP; tetanus toxoid to pregnant mothers

4.9 Poliomyelitis

Feature	Detail
Agent	Poliovirus (Enterovirus, RNA) — 3 serotypes
Transmission	Fecal-oral
Presentation	Fever, malaise, asymmetric flaccid paralysis (lower > upper limbs), no sensory loss, areflexia
Bulbar polio	Brainstem: dysphagia, dysphonia, respiratory failure
Post-polio syndrome	Progressive weakness decades after infection
Diagnosis	Stool culture (gold standard), CSF PCR
Management	Supportive: physiotherapy, respiratory support
Prevention	OPV (oral) + IPV (inactivated); Pakistan is one of 2 endemic countries (with Afghanistan)

4.10 Mumps

Feature	Detail
Agent	Mumps virus (Paramyxovirus)
Presentation	Fever, bilateral parotitis (earlobe displaced outward/upward), trismus, orchitis in post-pubertal males
Complications	Meningitis/encephalitis, orchitis/oophoritis, pancreatitis, deafness
Management	Supportive; analgesia for orchitis; MMR preventable

4.11 Tonsillopharyngitis

Feature	Viral	Bacterial (GAS)
Onset	Gradual	Acute/Sudden
Fever	Low-grade	High fever
Tonsils	Erythematous	Exudative (white/yellow patches)
Cough/Coryza	Common	Absent
Lymph nodes	Generalized	Anterior cervical, tender
Centor criteria	0–1	3–4 (fever, exudate, tender nodes, no cough)
Diagnosis	Clinical	Rapid strep test / throat culture
Treatment	Supportive	Penicillin V ×10 d or Amoxicillin

4.12 Croup (Laryngotracheobronchitis)

Recognition Pattern

Barking cough (seal-like) + Stridor + Hoarseness

Feature	Detail
Agent	Parainfluenza virus (most common)
Age	6 months – 3 years
Presentation	Barking cough, inspiratory stridor, hoarseness, worse at night, preceded by URI
CXR	"Steeple sign" (subglottic narrowing on AP view)
Severity	Mild: stridor only with agitation; Moderate: stridor at rest; Severe: stridor + retractions + distress
Management	Mild: Dexamethasone 0.15–0.6 mg/kg PO once; Moderate-Severe: + Nebulized Epinephrine
Differential	Epiglottitis (NO cough, drooling, distressed, different management)

4.13 Epiglottitis

Emergency: THUMBPRINT SIGN on lateral neck X-ray. High fever, drooling, tripod position, muffled voice, NO cough.

Never Do This

DO NOT examine throat with tongue depressor (may cause complete obstruction)
DO: Keep child calm, call anesthesia/ENT, prepare for intubation in OR
Antibiotics: Ceftriaxone or Cefotaxime IV (cover H. influenzae type b)

4.14 Bronchiolitis

Feature	Detail
Agent	RSV — most common
Age	<2 years (peak 2–6 months)
Presentation	Coryza + fever → tachypnea, wheezing, chest retractions, nasal flaring, cough
Signs	Chest hyperinflation, wheeze, fine crackles, prolonged expiration
CXR	Hyperinflation, atelectasis, peribronchial cuffing
Management	Supportive: Oxygen, nasal suction, hydration; NO bronchodilators routinely
Prevention	Palivizumab (monoclonal Ab) for high-risk infants (premature, CHD, CLD)

Viva Trap

"Do you give bronchodilators in bronchiolitis?" → Not routinely. May trial only if previous wheeze/asthma history.

4.15 Pneumonia

WHO Classification of Pneumonia

Category	Criteria	Management
No pneumonia (cough/cold)	Cough + no tachypnea, no chest indrawing	Home care, no antibiotics
Pneumonia	Cough + tachypnea	Oral Amoxicillin or Cotrimoxazole
Severe pneumonia	Cough + chest indrawing (with/without tachypnea)	IV Ampicillin + Gentamicin
Very severe pneumonia	Cough + central cyanosis, unable to feed, lethargy	IV antibiotics + Oxygen + supportive

Age Group	Tachypnea Definition
<2 months	RR >60/min
2–12 months	RR >50/min
1–5 years	RR >40/min

<3 months: IV Ampicillin + Gentamicin or Cefotaxime
3 mo–5 yr, non-severe: Oral Amoxicillin 45 mg/kg/day or Cotrimoxazole
>5 years: Macrolide (Azithromycin) for atypical + Amoxicillin if severe
[P]EMP: Preferred (Amoxicillin), Emergency (Ampicillin+Gent), Massive (Ceftriaxone), Persistent (Cloxacillin if staph)
Staphylococcal: Pneumatoceles, empyema, high fever, ill-appearing → Cloxacillin
Atypical (Mycoplasma): Older children, gradual onset, headache, dry cough → Macrolide
Tuberculosis: Ghon complex, persistent cough >2 weeks, weight loss, night sweats

4.16 Tuberculosis in Children

Feature	Detail
Primary TB	Ghon complex (parenchymal focus + enlarged hilar node); usually asymptomatic
Progressive primary	Childhood TB: cough >2 weeks, fever, weight loss, night sweats, fatigue
Miliary TB	Disseminated, "millet seed" CXR, hepatosplenomegaly, meningitis
TB Meningitis	Basal exudates, CN VI palsy, CSF: low glucose, high protein, lymphocytosis
Diagnosis	Mantoux/TST (>10 mm positive in children), GeneXpert, CXR, gastric aspirate
Treatment	2 months HRZE (INH, Rifampin, Pyrazinamide, Ethambutol) + 4 months HR
Prevention	BCG at birth (prevents severe forms: TB meningitis, miliary TB)

4.17 Meningitis in Children

Emergency — Bacterial Meningitis

Classic triad: Fever, Headache, Neck stiffness (may be absent in infants)
Infants: Lethargy, poor feeding, vomiting, bulging fontanelle, high-pitched cry, seizures
Kernig sign: Pain with knee extension when hip flexed
Brudzinski sign: Neck flexion causes hip/knee flexion

Feature	Bacterial	Viral (aseptic)	TB
Onset	Acute	Acute	Subacute
CSF appearance	Turbid/purulent	Clear	Clear, cobweb clot
CSF Glucose	Low (<40)	Normal	Low
CSF Protein	High (>100)	Normal/mild ↑	Very high
CSF Cells	High neutrophils	Lymphocytes	Lymphocytes
Gram stain	Positive	Negative	AFB negative (low yield)

Empiric: Ceftriaxone 100 mg/kg/day + Vancomycin
Dexamethasone: 0.15 mg/kg q6h ×2–4 days (start before/with antibiotics)
LP: If no contraindications (raised ICP, focal signs, coagulopathy)
Chemoprophylaxis: Rifampin for close contacts (N. meningitidis or H. influenzae)

4.18 Urinary Tract Infection

Feature	Detail
Definition	>10ⁱ CFU/mL on clean-catch, any growth on suprapubic aspirate
Presentation	<2 yr: Fever only, poor feeding, vomiting; >2 yr: Dysuria, frequency, suprapubic pain
Organisms	E. coli (80%), Klebsiella, Proteus, Enterococcus
Diagnosis	Urine R/E, culture; suprapubic aspiration (gold standard in infants)
Imaging	Renal US, MCUG (reflux), DMSA (scarring)
Management	<3 mo: IV Ampicillin + Gentamicin; >3 mo: Oral Cephalexin or Cotrimoxazole ×7–14 d

4.19 Acute Gastroenteritis & Dehydration

Feature	Some dehydration	Severe dehydration
General condition	Irritable, thirsty	Lethargic, limp
Eyes	Sunken	Very sunken
Mouth/tongue	Dry	Very dry
Skin pinch	Goes back slowly	Goes back very slowly (>2 sec)
Thirst	Drinks eagerly	Unable to drink
Plan	Plan B: ORS 75 mL/kg over 4 h + zinc	Plan C: IV Ringer's Lactate 100 mL/kg

Organism	Key Feature	Treatment
Cholera (V. cholerae)	"Rice-water" stools, severe dehydration	Doxycycline (or Azithromycin) + ORS/IV
E. coli (ETEC)	Watery diarrhea, traveler's diarrhea	Supportive, antibiotics if severe
Shigella	Dysentery (blood + mucus), tenesmus	Ceftriaxone or Azithromycin
Rotavirus	Winter, vomiting + watery diarrhea	Supportive; vaccine available
Giardia	Chronic diarrhea, foul-smelling stools	Metronidazole 15 mg/kg/day ×7 d
Amoebiasis	Dysentery, liver abscess	Metronidazole + Diloxanide furoate

ORS Composition (WHO): Glucose 75 mmol/L, Na 75 mEq/L, K 20 mEq/L, Cl 65 mEq/L, Citrate 10 mmol/L. Zinc 20 mg/day ×14 days for all children with diarrhea.

4.20 Worm Infestations

Worm	Key Feature	Treatment
Roundworm (Ascaris)	Most common; obstruction, pneumonitis (Loeffler)	Albendazole 400 mg single dose
Hookworm (Ancylostoma)	Iron deficiency anemia (chronic loss)	Albendazole 400 mg + Iron
Pinworm (Enterobius)	Perianal itching, nocturnal, whole family treated	Mebendazole 100 mg, repeat ×2 wk
Tapeworm (Taenia)	Pork/beef; proglottids in stools	Praziquantel or Niclosamide
Whipworm (Trichuris)	Dysentery, rectal prolapse	Albendazole 400 mg ×3 d or Mebendazole

Section 1.5

Neurology

5.1 Febrile Seizures

Feature	Simple	Complex
Age	6 months – 5 years	6 months – 5 years
Duration	<15 minutes	>15 minutes
Type	Generalized tonic-clonic	Focal or generalized
Number in 24 h	Single	Multiple (>1)
Post-ictal	Brief, recovers quickly	Prolonged, may have Todd's palsy
Recurrence risk	30–40%	Higher

Management

Acute seizure >5 min: Rectal Diazepam 0.5 mg/kg or Buccal Midazolam 0.3 mg/kg
Investigate if: <18 months (LP to rule out meningitis), complex features (neuroimaging)
NO prophylactic anticonvulsants
Parental education: Home management, when to seek emergency care

Viva Traps

"Do all febrile seizures need LP?" → NO, only if <18 months or meningitis suspected
"Give prophylactic phenobarbitone?" → NO
"Can parents give rectal diazepam at home?" → YES, if history of prolonged seizures

5.2 Status Epilepticus

Definition

Seizure lasting >5 minutes OR repeated seizures without recovery of consciousness.

Emergency Protocol

0–5 min (ABC): Airway, Breathing, Circulation; position on side, check glucose, O₂, IV/IO access
5–10 min (First-line): Benzodiazepine: IV Lorazepam 0.1 mg/kg or Rectal Diazepam 0.5 mg/kg or IV Diazepam 0.2 mg/kg
10–20 min (Repeat): Repeat benzodiazepine (same dose, once)
20–40 min (Second-line): Phenytoin 20 mg/kg IV over 20 min OR Fosphenytoin 20 mg PE/kg OR Phenobarbitone 20 mg/kg IV
>40 min (Third-line/ICU): Midazolam infusion / Propofol / Thiopentone; Intubation + ventilation; EEG monitoring

Common Causes in Children

Febrile seizures
CNS infections (meningitis, encephalitis)
Epilepsy (non-compliant with meds)
Metabolic (hypoglycemia, hyponatremia, hypocalcemia)
Toxins, trauma

Section 1.6

Respiratory & Allergy

6.1 Acute Severe Asthma (Status Asthmaticus)

Feature	Mild-Moderate	Severe	Life-Threatening
Talking	Sentences	Words	Unable to speak
Alertness	Agitated	Agitated	Drowsy/confused
Wheeze	Loud	Loud	Silent chest
Accessory muscles	Yes	Yes	Paradoxical movement
HR	<100 (>5 yr)	>125 (>5 yr)	Bradycardia
SpO₂	>92%	<92%	<92%
PEF	>50% predicted	33–50%	<33%

Immediate Management (First Hour)

Oxygen high-flow, target SpO₂ 94–98%
Salbutamol neb 2.5 mg (<5 yr) or 5 mg (>5 yr); back-to-back every 20 min ×3 or continuous
Ipratropium bromide 250–500 mcg added to salbutamol
Systemic steroids within 1 h: Prednisolone 1–2 mg/kg PO (max 40 mg) or IV Hydrocortisone 4 mg/kg
Reassess after 1 hour
IV Magnesium sulfate 40 mg/kg (max 2 g) over 20 min, single dose
IV Salbutamol infusion 1–5 mcg/kg/min (ICU, monitor K⁺)
Consider intubation / ICU if impending respiratory failure

Danger Signs & Viva Traps

Danger: Silent chest, cyanosis, poor effort, exhaustion, bradycardia, hypotension
"Antibiotics in asthma?" → NO (unless bacterial confirmed)
"When to intubate?" → Exhaustion, decreased consciousness, respiratory arrest
"Why silent chest bad?" → No air movement (complete obstruction)

6.2 Anaphylaxis

Definition & Clinical Criteria

Severe, life-threatening systemic allergic reaction. Diagnose if ANY one present:

Sudden onset (<2 h) involving skin/mucosa PLUS respiratory compromise OR hypotension
Two or more of: skin/mucosa, respiratory compromise, hypotension, GI symptoms
Hypotension after known allergen exposure

Emergency Management

EPINEPHRINE IM: 0.01 mg/kg of 1:1000 (0.01 mL/kg), max 0.3 mg (<6 yr) / 0.5 mg (>6 yr), anterolateral thigh, repeat q5–15 min
Call for help / activate emergency response
Position: lie flat + raise legs (if hypotensive); sitting (if respiratory distress); recovery (if unconscious)
Oxygen high-flow
IV fluids: 20 mL/kg bolus (if hypotensive)
Antihistamines (second-line): Chlorpheniramine 0.2 mg/kg IV/IM
Corticosteroids: Hydrocortisone 5 mg/kg IV (prevents biphasic)
Bronchodilators: Salbutamol neb if wheeze
Observe 4–24 h for biphasic reaction (20% of cases)

Discharge: prescribe EpiPen, educate avoidance, medical alert bracelet, refer to allergist.

Viva Favorites

"Why IM, not IV epinephrine?" → IM safer, adequate absorption, less arrhythmia (IV only if cardiac arrest)
"On beta-blockers?" → May not respond; give glucagon 1–2 mg IV
"Antihistamine first-line?" → NO! Epinephrine ALWAYS first

Section 1.7

Congenital Heart Diseases

7.1 Classification

Cyanotic (5 T's)

Tetralogy of Fallot
Transposition of Great Arteries
Tricuspid Atresia
Truncus Arteriosus
Total Anomalous Pulmonary Venous Return

Acyanotic

L→R shunts: VSD, ASD, PDA
Obstructive: Coarctation, AS, PS

7.2 Tetralogy of Fallot (Most common cyanotic CHD)

The 4 Defects

VSD (large)
Overriding aorta
Pulmonary stenosis (RVOT obstruction) — determines severity
RV hypertrophy (consequence)

Feature	Detail
Presentation	Cyanosis; "Tet spells" (hypercyanotic episodes triggered by crying, feeding, defecation)
Squatting	Increases SVR → decreases R→L shunt → increases pulmonary flow
CXR	"Boot-shaped heart" (coeur en sabot) — concave PA segment, upturned apex (RVH)
ECG	Right axis deviation, RVH
Tet spell management	Knee-chest position, O₂, Morphine 0.1 mg/kg SC/IM, IV fluids, Propranolol, Phenylephrine
Definitive treatment	Total surgical correction at 6–12 months

7.3 Transposition of Great Arteries (TGA)

Feature	Detail
Pathology	Aorta from RV, PA from LV → two parallel circulations (incompatible without mixing)
Survival depends on	VSD, ASD, or PDA (allows mixing)
Presentation	Cyanosis from birth, tachypnea, may have no murmur
CXR	"Egg-on-string"; narrow mediastinum; increased pulmonary vascular markings
Immediate management	Prostaglandin E1 infusion (keep PDA open)
Procedure	Balloon atrial septostomy (Rashkind)
Definitive	Arterial switch operation (first 2 weeks of life)

7.4 Ventricular Septal Defect

Most common CHD — 30% of all CHD. Types: Perimembranous (most common), muscular, inlet, outlet.

Paradox

Small VSD = louder murmur (high-velocity jet through small opening creates more turbulence). Roger disease: small, hemodynamically insignificant VSD with loud murmur.

Feature	Small VSD	Moderate VSD	Large VSD
Symptoms	Asymptomatic	Mild tachypnea with feeds	Heart failure, FTT, recurrent chest infections
Murmur	Loud holosystolic at LLSB	Holosystolic + apical diastolic flow	Softer murmur
Thrill	Present	Present	May be absent
Growth	Normal	Mildly affected	Severely affected
CXR	Normal	Cardiomegaly, increased markings	Marked cardiomegaly, pulmonary edema
Natural history	Many close spontaneously (30–50% by 2–4 yr)	Variable	Progressive pulmonary HTN

Small: Observation; endocarditis prophylaxis for dental procedures
Moderate: Diuretics + ACE inhibitors; surgery if symptomatic
Large: HF management (high-calorie feeds, diuretics, ACE inhibitors); surgical closure at 3–6 months
Complications: Infective endocarditis, Eisenmenger syndrome (surgically uncorrectable once reversed)

7.5 Atrial Septal Defect

Pathognomonic — Fixed Splitting of S2

S2 normally splits with inspiration; in ASD the split is wide and does not change with respiration
Mechanism: Constant increased RV volume → delayed pulmonic valve closure
Murmur: Systolic ejection at pulmonic area (increased flow across normal pulmonary valve)

Type	Location	Association
Ostium secundum	Mid-septum	Most common
Ostium primum	Lower septum	Down syndrome
Sinus venosus	Upper septum	Partial anomalous pulmonary venous return

Management: Small ASD may close spontaneously; significant ASD: device closure or surgical repair at 2–4 years. Goal: prevent arrhythmias, paradoxical embolism, pulmonary HTN.

7.6 Patent Ductus Arteriosus

Recognition Pattern

Continuous "machinery" murmur: throughout systole AND diastole, best at left infraclavicular area, radiates to back
Bounding pulses: wide pulse pressure, "water-hammer" pulse, continuous runoff into PA during diastole
Hyperactive precordium, tachypnea, poor feeding in large PDA
Maternal rubella in first trimester (congenital rubella syndrome)

Setting	Management
Premature infants	Indomethacin or Ibuprofen (inhibits prostaglandin synthesis); most effective first 2 weeks; CI: renal failure, bleeding, NEC
Term infants	Medical closure less effective; device closure (>6 mo); surgical ligation if not feasible

7.7 Coarctation of Aorta

Classic Presentation

"Upper body hypertension + Lower body hypotension"
BP higher in upper limbs than lower limbs
Radiofemoral delay: weak/delayed femoral pulses
Rib notching on CXR (collateral circulation via intercostals)
"Figure of 3" sign on CXR at coarctation site
Associated with Turner syndrome, bicuspid aortic valve

Management

Medical: Prostaglandin E1 if duct-dependent; treat heart failure
Definitive: Surgical repair or balloon angioplasty
Follow-up: Monitor for recoarctation, persistent hypertension

Section 1.8

Hematology

8.1 Anemia in Children

Age	Hemoglobin Threshold
6 months – 5 years	<11 g/dL
5–12 years	<11.5 g/dL
>12 years	<12 g/dL (F), <13 g/dL (M)

Classification by MCV

MICROCYTIC (MCV <80): Iron deficiency, Thalassemia, anemia of chronic disease, Lead poisoning
NORMOCYTIC (MCV 80–100): Acute blood loss, Hemolytic anemia
MACROCYTIC (MCV >100): B12 deficiency, Folate deficiency, anemia of chronic disease, bone marrow failure, Hypothyroidism, Liver disease

8.2 Iron Deficiency Anemia

Most common nutritional deficiency worldwide.

Risk Factors	Clinical Features
Premature birth	Pallor, fatigue, irritability
Exclusive BF >6 months without iron	Pica (craving non-food items)
Early introduction of cow's milk	Pagophagia (craving ice)
Chronic blood loss	Koilonychia (spoon-shaped nails)
Rapid growth periods	Glossitis, angular stomatitis
Poor dietary intake	Delayed development (severe)

Lab Test	Finding
Hemoglobin	Decreased
MCV	Decreased
Ferritin	<15 ng/mL (diagnostic)
TIBC	Increased
Transferrin saturation	<15%
RDW	Increased
Peripheral smear	Microcytic hypochromic RBCs, pencil cells

Oral iron: Elemental iron 3–6 mg/kg/day in 1–2 divided doses; empty stomach with vitamin C
Duration: 3 months after Hb normalizes (replenish stores)
Expected response: Reticulocytes ↑ in 3–5 days; Hb ↑ by 1 g/dL in 2–4 weeks
IV iron: If oral intolerance, malabsorption, or severe anemia

Viva Traps

"When to transfuse?" → Only if Hb <4 g/dL with cardiac compromise
"Black stools with iron?" → Normal, reassure parents
"No response to iron?" → Check compliance, consider thalassemia trait

8.3 Thalassemia

Core Concept

Inherited disorder of hemoglobin synthesis. Common in Mediterranean, Middle East, South Asia, Pakistan.

Beta-Thalassemia Major (Cooley Anemia)

Aspect	Detail
Genetics	Homozygous mutation
Presentation	4–6 months (when HbF declines); severe anemia requiring transfusions; FTT; hepatosplenomegaly
Skeletal	"Chipmunk facies", "hair-on-end" skull (X-ray), bossing
Laboratory	Hb 3–6 g/dL; microcytic hypochromic; target cells, nucleated RBCs; HbF elevated, HbA absent/low
Complications	Iron overload (cardiac, hepatic, endocrine), osteoporosis, thrombosis
Management	Transfusions q2–4 wk + chelation (Desferrioxamine/Deferasirox) + folic acid + splenectomy if hypersplenism; BMT curative

Beta-Thalassemia Minor (Trait)

Aspect	Detail
Genetics	Heterozygous mutation
Presentation	Asymptomatic or mild anemia; important for genetic counseling
Laboratory	MCV disproportionately low; Mentzer index <13 (MCV/RBC); HbA2 elevated
Management	No treatment; genetic counseling for couples

Alpha-Thalassemia

Type	Genes Deleted	Clinical Features
Silent carrier	1 gene	Asymptomatic, normal labs
Trait	2 genes	Mild microcytic anemia
HbH disease	3 genes	Moderate anemia, splenomegaly
Hydrops fetalis	4 genes	Incompatible with life, stillborn

8.4 Sickle Cell Disease

Core Concept

Abnormal hemoglobin (HbS) causes RBCs to sickle under low O₂. Autosomal recessive. HbSS = disease, HbAS = trait (asymptomatic). Common in Africa, Middle East, India.

Crisis	Features	Management
Vaso-occlusive (Pain)	Most common; severe bone pain; triggered by infection, dehydration, cold	Hydration, analgesia, O₂
Acute chest syndrome	Leading cause of death; fever, cough, chest pain, dyspnea, new infiltrate	Antibiotics, O₂, hydration, exchange transfusion if severe
Splenic sequestration	Sudden massive splenomegaly, severe anemia, shock (<5 yr)	Emergency transfusion
Aplastic crisis	Sudden Hb drop, low reticulocytes; Parvovirus B19	Transfusion, supportive
Stroke	Highest risk 2–10 yr; screen with TCD	Chronic transfusion if high risk

Chronic Management

Preventive: Penicillin prophylaxis 2 mo–5 yr; Pneumococcal/Hib/meningococcal vaccines; Folic acid; Hydroxyurea (increases HbF, reduces crises); annual TCD from age 2
Acute: Hydration, analgesia (NSAIDs/opioids), O₂ if hypoxic, antibiotics if infection, transfusion if severe
Curative: Bone marrow transplant
Autosplenectomy: Non-functional spleen by age 5 → increased infection risk (encapsulated organisms)

8.5 G6PD Deficiency

Most common enzyme deficiency worldwide. X-linked recessive (males affected, females carriers). Common in Mediterranean, Africa, Middle East, South Asia.

Triggers of Hemolysis

Infections: Most common trigger
Drugs: Primaquine, Chloroquine, Sulfonamides, Nitrofurantoin, Ciprofloxacin, Aspirin, Vitamin K, Methylene blue
Foods: Fava beans
Chemicals: Naphthalene (mothballs)

Clinical Features & Lab Findings

Acute hemolytic anemia: Pallor, jaundice, dark urine (hemoglobinuria), back/abdominal pain
Neonatal jaundice: May cause severe hyperbilirubinemia
Lab: Anemia with reticulocytosis; bite cells, blister cells; Heinz bodies; elevated indirect bilirubin, LDH; low haptoglobin
Diagnosis: G6PD enzyme assay (may be normal during acute hemolysis → recheck after crisis)

Management

Acute: Stop offending agent, hydration, transfusion if severe
Preventive: Avoid triggers, educate family, genetic counseling

Section 1.9

Nephrology

9.1 Acute Kidney Injury

KDIGO Criteria (ANY one)

Serum Cr increased by ≥0.3 mg/dL within 48 hours
Serum Cr ≥1.5× baseline within 7 days
Urine output <0.5 mL/kg/hr for 6 hours

Type	Cause	Urine	BUN/Cr
Pre-renal (70%)	Dehydration, shock, hemorrhage, HF	Concentrated, Na<20 mEq/L	>20:1
Intrinsic renal	ATN, GN, HUS	Dilute, Na>40, muddy brown casts	<20:1
Post-renal	Posterior urethral valves, stones	Variable, hydronephrosis on US	Variable

Identify and treat underlying cause; restore hemodynamics (fluids if hypovolemic)
Adjust drug doses for reduced GFR; monitor fluid balance, electrolytes, BP, nutrition

Indications for Dialysis (AEIOU)

Acidosis · Electrolyte abnormalities (hyperkalemia) · Intoxications · Overload (fluid) · Uremia (encephalopathy/pericarditis)

9.2 Hemolytic Uremic Syndrome (HUS)

Triad

Microangiopathic hemolytic anemia
Thrombocytopenia
Acute kidney injury

Most common cause of AKI in children.

	Typical HUS (90%)	Atypical HUS (10%)
Cause	E. coli O157:H7 (Shiga toxin)	Genetic complement abnormalities
Preceded by	Bloody diarrhea	No diarrhea
Age	Young children	Any age
Prognosis	Good, most recover	Worse, high recurrence

Management

Supportive care: fluid/electrolyte management; transfusion if severe anemia; dialysis if indicated
Avoid: Antibiotics (may worsen HUS), antidiarrheals, platelet transfusions (unless active bleeding)
Atypical HUS: Eculizumab (complement inhibitor)

9.3 Nephrotic Syndrome

Tetrad

Proteinuria: >40 mg/m²/hr or urine protein/Cr ratio >2
Hypoalbuminemia: <2.5 g/dL
Edema: Generalized
Hyperlipidemia

Type	Key Features
Minimal Change Disease (MCD)	Most common (80–90%); age 2–6 yr; steroid-responsive; good prognosis
FSGS	Less common; steroid-resistant; progressive renal failure
MPGN	Low complement; associated with infections (Hepatitis C)

Oral prednisolone: 60 mg/m²/day (max 60 mg) for 4–6 weeks, then taper over 2–3 months
Remission: Protein negative/trace for 3 consecutive days
Relapse: Protein 3+/4+ for 3 consecutive days
Complications: Infections (SBP, pneumococcal), thromboembolism, hypovolemia, dyslipidemia
Frequent relapsers: Steroid-sparing agents (Cyclophosphamide, Levamisole, Calcineurin inhibitors)
Steroid-resistant: Kidney biopsy (likely FSGS), ACE inhibitors to reduce proteinuria

Section 1.10

Endocrine

10.1 Diabetes Mellitus Type 1

Most common endocrine disease in children. Autoimmune destruction of β-cells. Peak: 10–14 yr.

Classic Presentation (4 P's)

Polyuria, Polydipsia, Polyphagia, Weight loss. Plus enuresis in previously toilet-trained child, fatigue, blurred vision, recurrent candidiasis.

Diagnosis (ANY one)

Fasting glucose ≥126 mg/dL
Random glucose ≥200 mg/dL + symptoms
HbA1c ≥6.5%
OGTT 2-hour glucose ≥200 mg/dL

Management: Insulin basal-bolus (total ~0.5–1 U/kg/day); HbA1c q3 months (target <7.5%); never stop insulin on sick days

Diabetic Ketoacidosis: Triad = Hyperglycemia (>200) + Ketosis + Metabolic acidosis (pH <7.3, HCO₃ <15). IV fluids (0.9% saline 10–20 mL/kg bolus → deficit over 48 h) → Insulin 0.05–0.1 U/kg/hr after fluids → K⁺ replacement. Cerebral edema is the most serious complication.

10.2 Congenital Hypothyroidism

Core Concept

Most common preventable cause of intellectual disability.

Causes: Thyroid dysgenesis (most common), dyshormonogenesis, maternal factors (iodine deficiency, antithyroid drugs)
Neonatal features: Prolonged jaundice, feeding difficulties, constipation, hypotonia, large fontanelles, umbilical hernia
If untreated: Cretinism (severe ID, short stature, coarse facies, protruding tongue, hoarse cry, pot belly)
Screening: TSH on heel-prick at 3–5 days; confirm with serum TSH, T4 (diagnosis: high TSH, low T4)
Treatment: Levothyroxine 10–15 mcg/kg/day immediately; early treatment prevents ID; lifelong therapy

10.3 Short Stature

Height <3rd percentile or <−2 SD below mean for age and sex.

Category	Cause	Key Feature
Endocrine	GH deficiency, Hypothyroidism, Cushing	Low growth velocity, delayed bone age
Skeletal dysplasia	Achondroplasia	Disproportionate short stature
Chronic disease	Celiac, IBD, CHD, Renal failure	Poor growth velocity, systemic symptoms
Genetic	Turner syndrome, Down syndrome	Dysmorphic features
Malnutrition	PEM, micronutrient deficiencies	History of poor nutrition
Psychosocial	Neglect, abuse	Environmental factors

Variants of Normal

Familial short stature: Parents short; normal growth velocity; bone age = chronological age
Constitutional delay: Delayed growth AND puberty; bone age < chronological age; "late bloomer"; achieves normal adult height

Approach: Plot growth chart; bone age X-ray; TFT; CBC/ESR; celiac screening; karyotype if Turner suspected; GH stimulation test / IGF-1 if GH deficiency.

Section 1.11

Viva Topics

11.1 Tanner Staging (Sexual Maturity Rating)

Girls

Stage	Breast Development	Pubic Hair
1	Prepubertal	None
2	Breast bud (thelarche) — first sign	Sparse, straight, along labia
3	Breast and areola enlarge	Darker, coarser, spreads
4	Areola and nipple form secondary mound	Adult type, limited area
5	Mature, nipple projects	Adult distribution, spreads to thighs

Boys

Stage	Genital Development	Pubic Hair
1	Prepubertal	None
2	Testicular enlargement >4 mL — first sign	Sparse, straight, at base of penis
3	Penis lengthens, testes/scrotum enlarge	Darker, coarser, spreads
4	Penis width increases, glans develops	Adult type, limited area
5	Adult size and shape	Adult distribution, spreads to thighs

Menarche: Usually at Tanner stage 4, about 2 years after thelarche.

11.2 Developmental Milestones Quick Reference

Age	Key Milestones
6 weeks	Social smile
3 months	Head control, coos
6 months	Sits with support, transfers objects, babbles, stranger anxiety begins
9 months	Sits without support, crawls, pincer grasp, mama/dada (non-specific)
12 months	Stands, may walk, 2–3 words (meaningful), waves bye-bye, object permanence
18 months	Walks well/runs, 10–20 words, feeds self with spoon
2 years	Kicks ball, 2-word sentences (50+ words), parallel play, points to body parts
3 years	Rides tricycle, copies circle, knows name/age, cooperative play, toilet trained
4 years	Hops on one foot, tells stories, copies cross, dresses independently
5 years	Skips, copies triangle, counts to 10, dresses independently

11.3 Birth Weight Milestones

Milestone	Timing
Birth weight regained	10–14 days
Birth weight doubles	5 months
Birth weight triples	1 year
Birth weight quadruples	2 years

Weight formulas: 3–12 months = Birth weight + (age in months × 0.7 kg); 1–6 years = (Age × 2) + 8 kg

11.4 Fontanelle Closure

Fontanelle	Normal Closure
Anterior	12–18 months (usually by 18 months)
Posterior	By 2–3 months

Early closure: Microcephaly, Craniosynostosis
Delayed closure: Rickets, Hypothyroidism, Hydrocephalus, Down syndrome

11.5 Dentition

Primary teeth: First tooth at 6 months (lower central incisors); 6–8 teeth by 1 year; formula: age in months − 6 = number of teeth (until 30 mo); complete: 20 teeth by 2.5–3 yr
Permanent teeth: First tooth at 6 years (first molars); total: 32 teeth
Delayed dentition: Rickets, hypothyroidism, familial

Section 1.12

Exam Scenarios

12.1 Pediatric Examination Stations

Scenario 1 — Respiratory System

Inspection: General appearance, nutritional status; distress (tachypnea, retractions, nasal flaring, cyanosis); chest shape (barrel, Harrison sulcus, pectus); skin (clubbing, cyanosis)
Palpation: Chest expansion, vocal fremitus, tracheal position
Percussion: Compare both sides, note dullness or hyperresonance
Auscultation: Breath sounds (vesicular, bronchial); added sounds (wheeze, crackles, stridor)
Complete with: Temperature, plot growth, check O₂ saturation

Scenario 2 — Cardiovascular System

Inspection: Cyanosis, clubbing, distress, precordial bulge, visible pulsations
Palpation: Pulse (rate, rhythm, volume, radiofemoral delay), apex beat, thrills, hepatomegaly
Auscultation: Heart sounds (S1, S2, splitting); murmurs (location, timing, character, radiation); BP
Complete with: All peripheral pulses, BP in all four limbs, HF signs

Scenario 3 — Development

Infant (0–12 mo): Gross motor (head control, sitting, standing); Fine (grasp, transfer); Social (smile, stranger anxiety); Language (cooing, babbling, words)
Toddler (1–3 yr): Gross (walking, running, stairs, tricycle); Fine (tower, drawing); Social (parallel play, feeding self); Language (word count, sentences)
Preschool (3–5 yr): Gross (hopping, skipping); Fine (copying shapes); Social (cooperative play, dressing); Language (sentences, storytelling)
Always: Plot on growth chart; check milestones; look for red flags

12.2 Common Clinical Questions

Q: Causes of Failure to Thrive

Non-organic (most common): Inadequate feeding practices, poverty/neglect, maternal depression
Organic: GI (Celiac, chronic diarrhea, GER); Cardiac (CHD); Respiratory (CLD, CF); Renal (CKD); Endocrine (Hypothyroidism, DM); Infections (TB, HIV)
Key: Thorough feeding/social history; plot growth; examine for systemic signs

Q: Causes of Hepatosplenomegaly

Infections: Viral (EBV, CMV, hepatitis); Bacterial (sepsis, typhoid); Parasitic (Malaria, Kala-azar)
Hematological: Thalassemia major, Sickle cell, Leukemia/lymphoma, hemolytic anemias
Metabolic: Glycogen storage diseases, Gaucher, Niemann-Pick
Cardiac: Congestive heart failure
Hepatic: Cirrhosis, portal hypertension
Infiltrative: Malignancy
Approach: Confirm organomegaly, look for associated features, investigate (CBC, smear, LFTs, US)

Q: Child with Fever and Rash

With cough/coryza: Measles (3 C's, Koplik spots, descending rash)
Scarlatiniform: Scarlet fever (strawberry tongue, sandpaper rash); Kawasaki (5 d fever, conjunctivitis, strawberry tongue)
Vesicular: Chickenpox (crops at different stages); Hand-foot-mouth (palms, soles, mouth)
Petechial/purpuric: Meningococcemia (non-blanching, ill); ITP (petechiae, well child)
Slapped cheek: Fifth disease / Parvovirus B19
Approach: Assess severity, meningeal signs, blanching, manage accordingly

Section 1.13

Bonus: Power Numbers, Buzzwords & Rapid-Fire MCQs

Power Numbers

Must-Know Values

Parameter	Value
HR Newborn	120–160/min
HR Infant	100–160/min
HR Child	70–120/min
HR Adolescent	60–100/min
RR <2 mo	<60/min
RR 2–12 mo	<50/min
RR 1–5 yr	<40/min
Hb 6 mo–5 yr	>11 g/dL
Hb 5–12 yr	>11.5 g/dL
Birth weight doubles	5 months
Birth weight triples	1 year
Anterior fontanelle closure	18 months
First tooth	6 months
BCG	At birth
Measles vaccine 1 / 2	9 mo / 15 mo
Iron therapy	3–6 mg/kg/day ×3 mo
Febrile seizure	<15 min = simple
Nephrotic steroids	60 mg/m²/day ×4–6 wk
DKA insulin	0.05–0.1 U/kg/hr

Buzzword Bank

Buzzword	Think of...
"Social smile absent at 2 months"	Red flag, assess development
"Fixed split S2"	ASD
"Machinery murmur"	PDA
"Boot-shaped heart"	Tetralogy of Fallot
"Egg-on-string" on CXR	TGA
"Squatting after exertion"	TOF
"Tet spell"	TOF hypercyanotic crisis
"Rice-water stools"	Cholera
"Strawberry tongue"	Scarlet fever or Kawasaki
"Koplik spots"	Measles
"Target sign on US"	Intussusception
"Red currant jelly stools"	Intussusception
"Barking cough"	Croup
"Steeple sign"	Croup
"Drooling + tripod position"	Epiglottitis
"Thumbprint sign"	Epiglottitis
"Knee-chest position"	TOF spell management
"Hair-on-end" skull X-ray	Thalassemia major
"Chipmunk facies"	Thalassemia major
"Heinz bodies, bite cells"	G6PD deficiency
"Schistocytes"	HUS, microangiopathic hemolysis
"Muddy brown casts"	Acute tubular necrosis
"Frothy urine + periorbital edema"	Nephrotic syndrome
"Kussmaul breathing + fruity breath"	DKA
"Prolonged jaundice in newborn"	Congenital hypothyroidism, biliary atresia

Rapid-Fire MCQ Practice (from the source sheet)

Drill — Question & Answer

6-month-old, exclusively breastfed, pale. Hb 8 g/dL, MCV 65. Most likely diagnosis? → Iron deficiency anemia
3-year-old, sudden severe pallor, splenomegaly, Hb 10 → 4 g/dL, reticulocytes 0.5%. Recent URI. Diagnosis? → Aplastic crisis (Parvovirus B19 in sickle cell)
Newborn at 36 hours, jaundice to chest, bilirubin 18 mg/dL. Management? → Phototherapy
2-year-old, recurrent chest infections, FTT, steatorrhea. Investigation of choice? → Sweat chloride test (Cystic fibrosis)
18-month-old, GTC seizure with fever 39°C lasting 3 min, fully conscious after 5 min. Diagnosis? → Simple febrile seizure
4-year-old, sudden dyspnea, drooling, sitting forward, muffled voice, high fever. First action? → Keep calm, call anesthesia (Epiglottitis)
8-year-old with periorbital edema, frothy urine, BP normal. Urine 4+ protein. Treatment? → Oral prednisolone (Nephrotic syndrome)
Newborn, cyanosis at birth, CXR "egg-on-string". Immediate management? → Prostaglandin E1 (TGA)
5-month-old, breast-fed, not started complementary feeds. When to start? → 6 months
Child with VSD, which is TRUE? (a) Large VSD loud murmur (b) All need surgery (c) Small VSD louder murmur (d) Holosystolic at apex → Small VSD has louder murmur

Section 1.15

MCQ Practice Session

50 exam-style questions spanning every section. Attempt all of them cold, ~90 seconds each, single best answer. Do not open Section 1.16 (Answer Key & Full Breakdown) until you have attempted and self-scored the entire set.

Q1 A1: A 30-minute-old term male newborn, delivered by uncomplicated vaginal delivery, has an Apgar of 3 at 1 minute with no cry and central cyanosis. He is not breathing spontaneously. The nurse asks when resuscitation should begin. What is the correct next step?

A) Begin positive-pressure ventilation immediately without waiting for the 5-minute Apgar
B) Wait for the 5-minute Apgar score before any intervention
C) Intubate and give epinephrine right now
D) Routine drying and place the baby with the mother
E) Obtain umbilical venous access before doing anything else

Q2 A2: A term 39-week male, born after a difficult delivery, develops seizures at 6 hours of life. Exam: lethargic, hypotonic, intermittent seizures with an abnormal EEG. He is diagnosed with Sarnat stage 2 hypoxic-ischemic encephalopathy. Which management is indicated?

A) Whole-body cooling to 33.5°C for 72 hours, then slow rewarming
B) Loading dose of phenobarbital and routine observation
C) Empirical antibiotics only
D) Exchange transfusion
E) Induced hyperthermia to 38°C

Q3 A3: A 4-day-old term male develops jaundice within the first 24 hours of life. Total bilirubin is 18 mg/dL with a direct component of 1 mg/dL. The infant is otherwise alert and feeding. How is this best characterized?

A) Pathological jaundice
B) Physiological jaundice
C) Breastfeeding jaundice
D) Breast milk jaundice
E) A normal variant

Q4 A4: An Rh-negative woman delivered an Rh-positive infant in her first pregnancy; the baby was unaffected. She is now pregnant again and the fetus shows hydrops fetalis on ultrasound. Which intervention prevents this in future Rh-negative pregnancies?

A) Anti-D immunoglobulin at 28 weeks and within 72 hours of delivery
B) Exchange transfusion of the newborn
C) Phototherapy
D) In vitro fertilization
E) Intrauterine antibiotics

Q5 A5: A 30-week preterm male develops tachypnea, grunting, nasal flaring and intercostal retractions at 2 hours of age. Chest X-ray shows a ground-glass appearance with air bronchograms. What is the definitive initial management?

A) Surfactant replacement + CPAP
B) Intravenous antibiotics alone
C) Furosemide
D) High-dose vitamin E
E) Observation with oxygen only

Q6 A6: An infant of a diabetic mother has a bedside glucose of 22 mg/dL and is symptomatic with jitteriness. Vitals stable. What is the correct immediate management?

A) IV 2 mL/kg 10% dextrose bolus followed by infusion at 6–8 mg/kg/min
B) Early oral feeding only
C) Intramuscular glucagon
D) Observation
E) Insulin infusion

Q7 A7: A 3-month-old infant has never smiled socially and has poor head control. By what age is absent social smile a red flag for developmental delay?

A) 2 months
B) 4 months
C) 6 months
D) 9 months
E) 12 months

Q8 A8: A 7-year-old girl develops breast budding (thelarche) with no virilization or masses. How is this best classified?

A) Precocious puberty (<8 years)
B) Normal variant for age
C) Delayed puberty
D) Constitutional delay
E) Isolated thelarche with no concern

Q9 A9: A boy's father is 180 cm tall and his mother is 165 cm tall. Using the mid-parental height formula for boys, what is his expected adult height?

A) 179 cm (range ±8.5 cm)
B) 165 cm
C) 172.5 cm
D) 187 cm
E) 157.5 cm

Q10 A10: A mother asks whether she can give her healthy 4-month-old son water and formula in addition to breastfeeding. What is the correct advice?

A) Exclusive breastfeeding for the first 6 months — no water, no other milk
B) Add water now to prevent dehydration
C) Switch fully to formula at 4 months
D) Start complementary solids at 4 months
E) Stop breastfeeding at 4 months

Q11 A11: A 1-year-old has bow legs, craniotabes, frontal bossing and widened wrists. X-ray shows widened epiphyses; vitamin D is low. What is the treatment?

A) Vitamin D 600,000 IU IM single dose plus calcium
B) Calcium supplementation alone
C) Vitamin C
D) Observation and reassurance
E) Iron replacement

Q12 A12: An 18-month-old is severely wasted with absent subcutaneous fat and loose skin folds, irritable, with no edema. He was weaned onto a dilute rice-gruel diet. What is the most likely diagnosis?

A) Marasmus
B) Kwashiorkor
C) Both marasmus and kwashiorkor
D) Normal for age
E) Scurvy

Q13 A13: A 3-year-old has 3 days of cough, coryza and conjunctivitis followed by a maculopapular rash starting behind the ears and spreading downward. Exam reveals white spots on the buccal mucosa. What is the diagnosis?

A) Measles
B) Rubella
C) Scarlet fever
D) Varicella
E) Roseola

Q14 A14: A 3-year-old has 6 days of high fever, bilateral non-exudative conjunctivitis, strawberry tongue, a truncal polymorphous rash, edema of the hands and feet, and a 2 cm unilateral cervical lymph node. Which treatment reduces the risk of coronary aneurysm?

A) IVIG 2 g/kg single dose within 10 days
B) Aspirin alone
C) High-dose steroids
D) Empirical antibiotics
E) Observation alone

Q15 A15: A 2-year-old has a 2-day history of URI followed by a barking cough and inspiratory stridor that is present at rest, with no drooling. How is the croup severity classified?

A) Moderate croup
B) Mild croup
C) Severe croup
D) Epiglottitis
E) Bronchiolitis

Q16 A16: A 4-year-old suddenly develops high fever, drooling, sits forward in the tripod position with a muffled voice and no cough. Lateral neck X-ray shows a thumbprint sign. What is the first step?

A) Keep the child calm and call anesthesia/ENT; prepare for intubation in the OR
B) Examine the throat with a tongue depressor
C) Give oral amoxicillin
D) Intubate immediately at the bedside
E) Order a chest X-ray

Q17 A17: A 3-month-old has coryza and fever progressing to tachypnea, wheeze, chest retractions and nasal flaring. Chest is hyperinflated with fine crackles; RSV is detected. What is the mainstay of management?

A) Supportive: oxygen, nasal suction, hydration; no routine bronchodilators
B) Nebulized bronchodilators routinely
C) Systemic steroids
D) Intravenous antibiotics
E) Diuretics

Q18 A18: A 6-month-old has cough and a respiratory rate of 70/min with chest indrawing but no central cyanosis. Per WHO classification, what is this and how is it managed?

A) Severe pneumonia — IV ampicillin + gentamicin
B) Pneumonia — oral amoxicillin
C) Very severe pneumonia — IV antibiotics + oxygen
D) No pneumonia — home care
E) Wheeze — bronchodilator only

Q19 A19: An 8-month-old has 2 days of fever, lethargy, poor feeding and vomiting. Exam: bulging anterior fontanelle, high-pitched cry. LP yields turbid CSF with neutrophils, glucose 20 mg/dL, protein 180 mg/dL. What is the empiric treatment?

A) Ceftriaxone + vancomycin
B) Acyclovir
C) Ampicillin only
D) Dexamethasone alone
E) Benzylpenicillin

Q20 A20: A 5-month-old girl has 2 days of unexplained fever (39.5°C), poor feeding and vomiting. Urinalysis shows >10ⁱ CFU/mL. What is the initial management?

A) IV ampicillin + gentamicin
B) Oral cephalexin
C) Observation
D) Immediate surgical referral
E) Withhold antibiotics

Q21 A21: A 1-year-old in a cholera outbreak has abrupt onset of profuse watery "rice-water" stools with severe dehydration (lethargic, sunken eyes, skin pinch >2 sec). What is the key management?

A) Doxycycline (or azithromycin in children) + IV fluids / ORS
B) Loperamide
C) Oral rehydration only with no antibiotics
D) Metronidazole
E) Nothing by mouth

Q22 A22: A 4-year-old has perianal itching worse at night; the whole family is affected and eggs are seen on tape test. What is the treatment?

A) Mebendazole 100 mg, repeat after 2 weeks (treat household)
B) Albendazole 400 mg single dose only
C) Praziquantel
D) Iron supplementation
E) Topical steroid

Q23 A23: A 2-year-old has a 10-minute generalized tonic-clonic seizure during a 39°C febrile illness, a single episode, fully recovering within minutes. What is the correct management?

A) No prophylactic anticonvulsants; reassure and treat the fever
B) Start phenobarbital prophylaxis
C) Lumbar puncture routinely in all cases
D) Daily diazepam
E) Admit for IV antibiotics

Q24 A24: A 7-year-old has a seizure ongoing for 12 minutes with IV access established. What is the appropriate first-line acute treatment?

A) Benzodiazepine (IV lorazepam 0.1 mg/kg)
B) Phenytoin 20 mg/kg
C) Propofol infusion
D) IV glucose
E) Magnesium sulfate

Q25 A25: A 7-year-old's seizure has continued for 25 minutes despite two doses of benzodiazepine and the child is still convulsing. What is the next step?

A) Phenytoin 20 mg/kg IV over 20 minutes
B) Repeat benzodiazepine a third time
C) Intubate and start propofol
D) Give IV glucose
E) Observe and wait

Q26 A26: An 8-year-old known asthmatic is brought in with a silent chest, drowsy, SpO2 88%, and unable to speak. What is the priority action?

A) Intubation / ICU admission
B) Oral salbutamol
C) Observe in waiting room
D) Discharge with an inhaler
E) Antibiotics

Q27 A27: A 10-year-old asthmatic has words only, SpO2 93%, and PEF 45% of predicted. How is the severity classified?

A) Severe
B) Mild-moderate
C) Life-threatening
D) Moderate
E) Resolving

Q28 A28: A 9-year-old eats peanut and within 20 minutes develops urticaria, wheezing and hypotension. What is the first-line immediate treatment?

A) IM epinephrine 0.01 mg/kg of 1:1000 into the anterolateral thigh
B) Antihistamine
C) Corticosteroid
D) Oxygen only
E) IV fluids only

Q29 A29: A viva examiner asks why epinephrine is given intramuscularly rather than intravenously in anaphylaxis. What is the best answer?

A) IM is safer with less arrhythmia risk; IV only if cardiac arrest
B) IM works faster than IV
C) IM is cheaper
D) IM is less painful
E) IM gives better tissue absorption

Q30 A30: A 1-year-old with known Tetralogy of Fallot develops a hypercyanotic "tet" spell after crying. What is the immediate management?

A) Knee-chest position, O₂, morphine, IV fluids, propranolol
B) Prostaglandin E1 infusion
C) Immediate intubation
D) Diuretics
E) Blood transfusion

Q31 A31: In Tetralogy of Fallot, which of the four defects determines the severity of cyanosis?

A) Pulmonary stenosis (RVOT obstruction)
B) Ventricular septal defect
C) Overriding aorta
D) Right ventricular hypertrophy
E) Atrial septal defect

Q32 A32: A newborn is cyanotic from birth with an "egg-on-string" appearance on CXR and increased pulmonary vascular markings. What is the immediate management?

A) Prostaglandin E1 to keep the PDA open
B) Definitive arterial switch operation now
C) High-flow oxygen alone
D) Diuretics
E) Aspirin

Q33 A33: A child with a small VSD has a loud holosystolic murmur, while a child with a large VSD has a softer murmur. This paradox occurs because:

A) A small defect creates a higher-velocity jet → more turbulence
B) Large defects are always louder
C) Defect size does not affect loudness
D) Small defects produce no turbulence
E) Murmur reflects shunt volume only

Q34 A34: A child has a widely split S2 that does not change with inspiration. Where is the murmur generated?

A) Increased RV volume delays pulmonic valve closure (flow across a normal pulmonary valve)
B) Mitral regurgitation
C) Tricuspid regurgitation
D) Aortic stenosis
E) PDA runoff into the pulmonary artery

Q35 A35: A 1-week-old preterm infant has a continuous "machinery" murmur and a large PDA. What is the recommended first-line closure method?

A) Indomethacin or ibuprofen (inhibits prostaglandin synthesis)
B) Surgical ligation as first line
C) Prostaglandin E1 infusion
D) Furosemide
E) Observation only

Q36 A36: A 9-year-old has upper-limb hypertension, weak delayed femoral pulses, and rib notching on CXR. What does rib notching indicate?

A) Collateral circulation via intercostal arteries (coarctation)
B) Tetralogy of Fallot
C) Transposition of the great arteries
D) Atrial septal defect
E) Patent ductus arteriosus

Q37 A37: A 3-year-old has a hemoglobin of 10.5 g/dL. Is this anemia?

A) Yes — threshold for 6 months–5 years is <11 g/dL
B) No, it is normal
C) It indicates polycythemia
D) Borderline only if <10 g/dL
E) Cannot be determined

Q38 A38: A 1-year-old is pale and irritable, exclusively breastfed beyond 6 months without iron supplementation. Labs: Hb 7, MCV 60, ferritin 8, TIBC high, pencil cells on smear. What is the diagnosis?

A) Iron deficiency anemia
B) Beta-thalassemia trait
C) Anemia of chronic disease
D) Lead poisoning
E) Normal variant

Q39 A39: A child begins oral iron therapy for iron deficiency anemia. When do you expect the reticulocyte count to rise?

A) 3–5 days
B) Within 24 hours
C) 2 weeks
D) 1 month
E) It does not rise

Q40 A40: An 8-month-old has failure to thrive, hepatosplenomegaly, "chipmunk facies" and Hb 5 g/dL with target cells and nucleated RBCs; HbF is elevated. What is the diagnosis?

A) Beta-thalassemia major
B) Iron deficiency anemia
C) Sickle cell disease
D) G6PD deficiency
E) Lead poisoning

Q41 A41: A 5-year-old with known sickle cell disease develops sudden pallor and massive splenomegaly; Hb drops from 10 to 4 g/dL with reticulocytes 0.5% after a recent URI. What is the diagnosis?

A) Aplastic crisis (Parvovirus B19)
B) Vaso-occlusive (pain) crisis
C) Splenic sequestration
D) Acute chest syndrome
E) Stroke

Q42 A42: A 2-year-old develops jaundice and dark urine after eating fava beans; smear shows bite cells and Heinz bodies. The most likely trigger is:

A) Fava beans
B) Cow's milk
C) Iron deficiency
D) Viral infection only
E) None of the above

Q43 A43: A 4-year-old with severe gastroenteritis has concentrated urine (Na <20 mEq/L), a BUN/Cr ratio >20:1, and improves with fluid resuscitation. The AKI type is:

A) Pre-renal (70% of pediatric AKI)
B) Intrinsic (ATN)
C) Post-renal
D) Chronic kidney disease
E) None of the above

Q44 A44: A 3-year-old had bloody diarrhea and now has microangiopathic hemolytic anemia, thrombocytopenia and acute kidney injury. Which intervention is contraindicated?

A) Antibiotics (may worsen HUS)
B) Fluid/electrolyte support
C) Transfusion if severe anemia
D) Dialysis if indicated
E) Supportive care

Q45 A45: A 3-year-old has periorbital edema, 4+ proteinuria, hypoalbuminemia (<2.5 g/dL) and hyperlipidemia. What is the first-line treatment?

A) Oral prednisolone 60 mg/m²/day for 4–6 weeks, then taper
B) Antibiotics
C) Diuretic monotherapy
D) ACE inhibitor only
E) Plasmapheresis

Q46 A46: A 12-year-old with new polyuria and weight loss has pH 7.1, glucose 400 mg/dL, and positive ketones. When should insulin be started?

A) After fluids, at 0.05–0.1 U/kg/hr IV
B) As an immediate IV bolus before fluids
C) Only after 24 hours
D) Oral hypoglycemic agent
E) Insulin is not needed

Q47 A47: Newborn screening for congenital hypothyroidism is performed by:

A) TSH on heel-prick at 3–5 days
B) TSH measured at birth
C) T4 at 1 month
D) Thyroid ultrasound at 6 months
E) Clinical exam alone

Q48 A48: A 9-year-old has low growth velocity, delayed bone age, normal parents, and no systemic illness. This pattern is most consistent with:

A) Endocrine cause (GH deficiency)
B) Familial short stature
C) Constitutional delay
D) Psychosocial short stature
E) Malnutrition

Q49 A49: A 2-year-old has failure to thrive. The most appropriate initial approach is:

A) Thorough feeding and social history plus a growth-chart plot
B) Immediate endocrine workup
C) Admit for IV feeds
D) Refer to surgery
E) Reassure the family

Q50 A50: On cardiac exam a child has a widely split S2 that does not change with inspiration. This is pathognomonic of:

A) Atrial septal defect
B) Ventricular septal defect
C) Patent ductus arteriosus
D) Tetralogy of Fallot
E) Mitral regurgitation

Section 1.16

Answer Key & Full Breakdown

Every question: the correct answer, the tested concept and its cognitive level, the discriminator, why each wrong option fails, the trap type, and a one-line future alert. Log misses in the error log.

Q1 — Answer & Breakdown

Correct: A) APGAR at 1 and 5 minutes, repeat every 5 min until ≥7

Concept: APGAR timing & interpretation Recall

Why A: APGAR scores the transition at 1 and 5 minutes; if <7 it is repeated every 5 min to document recovery, and it guides resuscitation intensity.

Discriminator: "Needs resuscitation" alone is not enough — the score must be serial.

B) Cord pH only	An adjunct for asphyxia, never replaces serial APGAR transition scoring
C) Ballard	Estimates gestational age, not transition
D) Dubowitz	Maturity scoring, not immediate transition
E) Silverman	Respiratory-distress scoring, not the global transition screen

Trap: Mixing gestational-age/maturity tools with transition scoring.

Future alert: APGAR at 1 and 5 min; repeat every 5 min until ≥7.

Q2 — Answer & Breakdown

Correct: A) Cooling (33.5°C) within 6 h for 72 h, if ≥36 wk and pH <7 or base deficit ≥16

Concept: Neonatal hypoxic-ischemic encephalopathy (HIE) Recall

Why A: Therapeutic hypothermia within 6 h for moderate-to-severe HIE in ≥36-week infants reduces death and neurodisability.

Discriminator: Apnea/brady alone does not qualify; you need pH <7 or base deficit ≥16 with an abnormal neuro exam.

B) Hyperthermia	Worsens neuronal injury
C) High-dose phenobarbital	No proven benefit in HIE
D) Dexamethasone	Not indicated
E) No intervention	Misses a proven therapy

Trap: Treating outside the window or without criteria.

Future alert: HIE → cooling 33.5°C within 6 h, 72 h, in ≥36 wk with pH <7 or BD ≥16.

Q3 — Answer & Breakdown

Correct: A) Jaundice <24 h, rises >5 mg/dL/day, direct >2, or lethargy

Concept: Pathological jaundice criteria Recall

Why A: These are the danger signs; physiologic peaks around day 3–4 at ~10–12 mg/dL and is indirect, benign.

Discriminator: The exam wants the danger signs, not the benign "recent feeds" story.

B) Appears day 3, normal feeds	Classic physiologic pattern
C) Resolves by 1 wk (term)	Physiologic in the term infant
D) Indirect-only, mild	Physiologic
E) Breast-milk jaundice	Common benign entity

Trap: Calling benign physiologic jaundice pathological.

Future alert: Jaundice <24 h, >5/day, direct >2, or lethargy → pathological, act.

Q4 — Answer & Breakdown

Correct: A) Anti-D 300 µg at 28 wk and within 72 h of birth (if infant RhD+)

Concept: Rh prophylaxis Recall

Why A: Given to the non-sensitized RhD-negative mother at 28 wk and <72 h after a sensitizing event, it prevents alloimmunization.

Discriminator: Already sensitized (anti-D present) → no benefit.

B) At 20 wk	Too early to cover the at-risk period
C) At 12 wk	No indication that early
D) To the RhD+ mother	Wrong recipient — give to RhD-negative
E) Both parents Rh-negative	No fetomaternal Rh conflict

Trap: Wrong mother or wrong timing.

Future alert: RhD-negative mother → anti-D at 28 wk and <72 h after delivery.

Q5 — Answer & Breakdown

Correct: A) Surfactant via ETT + antenatal maternal steroids before 34 wk

Concept: RDS prevention and treatment Recall

Why A: Surfactant deficiency causes atelectasis and ground-glass CXR; treat with surfactant via ETT and support with CPAP, prevent with antenatal steroids.

Discriminator: Oxygen alone does not fix the surfactant deficiency.

B) Oxygen alone	Insufficient for surfactant deficiency
C) Antibiotics first-line	Only if sepsis is suspected
D) Diuretics	Not first-line
E) Fluid restriction	Not the treatment

Trap: Treating the symptom (O2) instead of the cause (surfactant).

Future alert: Preterm respiratory distress → antenatal steroids + surfactant via ETT.

Q6 — Answer & Breakdown

Correct: A) Dextrose 2 mL/kg of 10% IV bolus, then maintenance infusion

Concept: Neonatal hypoglycemia emergency Recall

Why A: Symptomatic or markedly low glucose needs IV 10% dextrose bolus to protect the brain, then a maintenance infusion.

Discriminator: Asymptomatic mild lows may feed; symptomatic needs IV dextrose, not just feeding.

B) Oral feed only	Fails if symptomatic or unsafe to feed
C) IM glucagon	Only if infusion fails
D) Observe	Dangerous — brain injury risk
E) Insulin	Wrong direction entirely

Trap: Under-treating symptomatic hypoglycemia.

Future alert: Symptomatic/low-glucose neonate → IV 10% dextrose 2 mL/kg bolus.

Q7 — Answer & Breakdown

Correct: A) 2 months

Concept: Psychomotor milestones Recall

Why A: Social smile is expected by 2 months; absence beyond that is a red flag warranting developmental/autism screening.

Discriminator: Earlier smiling is reflexive, not social.

B) 4 months	Already overdue as a screen trigger
C) 6 months	Very late
D) 9 months	Misses the window
E) 12 months	Far too late

Trap: Milestone-age confusion.

Future alert: No social smile by 2 months → screen.

Q8 — Answer & Breakdown

Correct: A) Precocious puberty (<8 years)

Concept: Puberty timing Recall

Why A: Thelarche before 8 years in girls is precocious and needs evaluation for central vs peripheral causes.

Discriminator: No virilization rules out CAH; age <8 defines precocious.

B) Normal variant	<8 yr is pathologic, not a variant
C) Delayed puberty	Opposite
D) Constitutional delay	Opposite
E) Isolated thelarche	Not a classification; warrants workup

Trap: Misreading a clear pathology as benign.

Future alert: Thelarche/pubarche <8 yr → precocious, evaluate.

Q9 — Answer & Breakdown

Correct: A) 179 cm (range ±8.5 cm)

Concept: Mid-parental height Recall / Computation

Why A: Boys: (father + mother + 13) / 2 = (180 + 165 + 13) / 2 = 179; target range ±8.5 cm.

Discriminator: Use +13 for boys; the sex offset is the common error.

B) 165 cm	Mother's height only
C) 172.5 cm	Averaged without the +13 offset
D) 187 cm	Arithmetic error
E) 157.5 cm	Wrong formula

Trap: Arithmetic / sex-offset error.

Future alert: Boys MPH = (father + mother + 13) / 2 ±8.5.

Q10 — Answer & Breakdown

Correct: A) Exclusive breastfeeding for the first 6 months — no water, no other milk

Concept: Infant feeding Recall

Why A: Exclusive breastfeeding for 6 months, then complementary foods with continued breastfeeding to 2 years; water is not needed.

Discriminator: Water at 4 months is unnecessary; solids start at 6 months.

B) Add water now	Not needed at 4 months
C) Switch to formula at 4 mo	No indication
D) Start solids at 4 mo	Too early
E) Stop breastfeeding at 4 mo	Contrary to guidance

Trap: Early-supplementation myths.

Future alert: Exclusive breastfeeding for 6 months.

Q11 — Answer & Breakdown

Correct: A) Vitamin D 600,000 IU IM single dose plus calcium

Concept: Nutritional rickets treatment Recall

Why A: High-dose (stoss) vitamin D with calcium repletion heals the bone disease; radiology confirms healing.

Discriminator: Calcium alone does not fix the underlying vitamin D deficiency.

B) Calcium alone	Incomplete — deficiency is vitamin D
C) Vitamin C	That is for scurvy
D) Observation	Bone disease progresses
E) Iron replacement	Different deficiency

Trap: Treating one deficiency and missing the other.

Future alert: Rickets → vitamin D stoss + calcium.

Q12 — Answer & Breakdown

Correct: A) Marasmus

Concept: Protein-energy malnutrition types Recall

Why A: Chronic severe energy deficit → wasting, absent subcutaneous fat, loose skin folds, irritable, and NO edema; kwashiorkor presents with edema.

Discriminator: Edema absent = marasmus; edema present = kwashiorkor.

B) Kwashiorkor	Has pitting edema
C) Both	Not the picture here
D) Normal for age	Clearly abnormal
E) Scurvy	Bleeding gums, not wasting

Trap: Confusing the two forms of PEM.

Future alert: Wasting + no edema = marasmus.

Q13 — Answer & Breakdown

Correct: A) Measles

Concept: Viral exanthems Recall

Why A: The 3 C's prodrome (cough, coryza, conjunctivitis) plus Koplik spots and a descending rash from the head is measles.

Discriminator: Koplik spots are pathognomonic; rubella is milder and short-lived.

B) Rubella	Milder, brief, post-auricular nodes
C) Scarlet fever	Sandpaper rash, strawberry tongue, no Koplik
D) Varicella	Vesicular, centripetal
E) Roseola	Fever first, then rash as fever ends

Trap: Exanthem confusion.

Future alert: 3 C's + Koplik spots = measles.

Q14 — Answer & Breakdown

Correct: A) IVIG 2 g/kg single dose within 10 days

Concept: Kawasaki disease treatment Recall

Why A: Fever ≥5 days with ≥4 of 5 criteria; IVIG within 10 days with aspirin cuts coronary-aneurysm risk.

Discriminator: Treatment is IVIG, not steroids or antibiotics.

B) Aspirin alone	Insufficient without IVIG
C) High-dose steroids	Not first-line
D) Empirical antibiotics	Does not address vasculitis
E) Observation	Risks coronary aneurysm

Trap: Under-treatment.

Future alert: Kawasaki → IVIG 2 g/kg within 10 days.

Q15 — Answer & Breakdown

Correct: A) Moderate croup

Concept: Croup severity grading Recall

Why A: Stridor at rest defines moderate croup; mild croup has stridor only when upset.

Discriminator: At-rest stridor separates moderate from mild.

B) Mild croup	Stridor only with agitation
C) Severe croup	Adds sternal retraction, cyanosis, low SpO2
D) Epiglottitis	No cough, drooling, tripod
E) Bronchiolitis	Wheeze, not stridor

Trap: Severity grading.

Future alert: Stridor at rest = moderate croup.

Q16 — Answer & Breakdown

Correct: A) Keep the child calm and call anesthesia/ENT; prepare intubation in the OR

Concept: Epiglottitis airway emergency Recall

Why A: The airway is the threat; never agitate or force a throat exam — secure it in the OR.

Discriminator: Tripod + drooling + muffled voice + NO cough = epiglottitis.

B) Examine throat with depressor	May precipitate arrest
C) Oral amoxicillin	After the airway is secured
D) Intubate at bedside	Risky without a controlled setting
E) Chest X-ray	Lateral neck shows the thumbprint, but airway comes first

Trap: Forcing the exam / delaying the airway.

Future alert: Epiglottitis → secure airway in the OR, do not disturb.

Q17 — Answer & Breakdown

Correct: A) Supportive: oxygen, nasal suction, hydration; no routine bronchodilators

Concept: Bronchiolitis management Recall

Why A: RSV bronchiolitis is supportive; bronchodilators are not routinely beneficial.

Discriminator: Young infant + preceding URI + wheeze + hyperinflation.

B) Routine bronchodilator	Not proven to help
C) Systemic steroids	No benefit
D) IV antibiotics	Only if bacterial superinfection
E) Diuretics	No role

Trap: Over-treatment.

Future alert: Bronchiolitis → supportive, no routine bronchodilators.

Q18 — Answer & Breakdown

Correct: A) Severe pneumonia — IV ampicillin + gentamicin

Concept: WHO pneumonia classification Recall

Why A: RR >60 with chest indrawing and no cyanosis = severe pneumonia → IV antibiotics; very severe adds cyanosis or general danger signs.

Discriminator: Indrawing + tachypnea = severe, not very severe.

B) Oral amoxicillin	For non-severe pneumonia
C) Very severe	Needs cyanosis / danger signs
D) No pneumonia	Clearly pneumonia
E) Bronchodilator only	Wrong — this is pneumonia

Trap: Misclassifying severity.

Future alert: Severe pneumonia (RR↑ + indrawing) → IV ampicillin + gentamicin.

Q19 — Answer & Breakdown

Correct: A) Ceftriaxone + vancomycin

Concept: Bacterial meningitis empiric therapy Recall

Why A: Turbid CSF, low glucose, high protein = bacterial; cover pneumococcus/Hib/meningococcus with ceftriaxone + vancomycin (neonate adds ampicillin for Listeria).

Discriminator: Low glucose + high protein confirms bacterial, not viral.

B) Acyclovir	For HSV, not the first empiric cover
C) Ampicillin only	Misses pneumococcus
D) Dexamethasone alone	Adjunct, not therapy
E) Benzylpenicillin	Narrower than needed

Trap: Too-narrow coverage.

Future alert: Bacterial meningitis → ceftriaxone + vancomycin.

Q20 — Answer & Breakdown

Correct: A) IV ampicillin + gentamicin

Concept: Neonatal / infant UTI Recall

Why A: Under 3 months or toxic → IV ampicillin + gentamicin; rule out pyelonephritis and sepsis.

Discriminator: Age <3 months = high risk, treat IV.

B) Oral cephalexin	For older, low-risk outpatients
C) Observation	Dangerous in this age
D) Surgical referral	Not the acute step
E) Withhold antibiotics	Wrong

Trap: Treating infant UTI as outpatient.

Future alert: Infant <3 months with UTI → IV ampicillin + gentamicin.

Q21 — Answer & Breakdown

Correct: A) Doxycycline (or azithromycin in children) + IV fluids / ORS

Concept: Cholera management Recall

Why A: Rehydration is lifesaving; a single-dose antibiotic shortens shedding and duration (tetracycline class / azithromycin).

Discriminator: Antimotility and NPO worsen the picture.

B) Loperamide	Contraindicated — worsens toxic megacolon risk
C) ORS only	Adequate only if mild; severe needs IV + antibiotic
D) Metronidazole	Not the agent for cholera
E) Nothing by mouth	Dangerous — rehydration is the cure

Trap: Withholding antibiotics / antimotility abuse.

Future alert: Cholera → rehydrate + single-dose antibiotic.

Q22 — Answer & Breakdown

Correct: A) Mebendazole 100 mg, repeat after 2 weeks (treat household)

Concept: Enterobius (pinworm) treatment Recall

Why A: Mebendazole / albendazole with a repeat dose and household treatment clears the infestation.

Discriminator: Family involvement requires treating contacts.

B) Albendazole single only	Needs the repeat dose
C) Praziquantel	For flukes / tapeworms
D) Iron	Wrong problem
E) Topical steroid	Wrong problem

Trap: Single dose without retreatment.

Future alert: Pinworm → mebendazole, repeat in 2 weeks, treat family.

Q23 — Answer & Breakdown

Correct: A) No prophylactic anticonvulsants; reassure and treat the fever

Concept: Simple febrile seizure Recall

Why A: A single <15-min seizure with full recovery is benign; no prophylaxis, just safety, fever control, and education.

Discriminator: Without meningitis signs, LP is not routine.

B) Phenobarbital prophylaxis	Not indicated
C) LP routinely	Only if meningitis suspected
D) Daily diazepam	Not for simple febrile seizures
E) Admit for IV antibiotics	Not routine

Trap: Over-investigation / prophylaxis.

Future alert: Simple febrile seizure → reassure, no prophylaxis.

Q24 — Answer & Breakdown

Correct: A) Benzodiazepine (IV lorazepam 0.1 mg/kg)

Concept: Status epilepticus first-line Recall

Why A: A benzodiazepine within 5 minutes is first-line; second-line is phenytoin / levetiracetam.

Discriminator: Established seizure >5 minutes.

B) Phenytoin	Second-line
C) Propofol	Refractory stage
D) IV glucose	Only if hypoglycemia
E) Magnesium	Eclampsia context

Trap: Skipping the benzo to second-line.

Future alert: Status → benzo first.

Q25 — Answer & Breakdown

Correct: A) Phenytoin 20 mg/kg IV over 20 minutes

Concept: Status epilepticus second-line Recall

Why A: If the seizure persists 20–40 minutes after benzodiazepines, give IV phenytoin / levetiracetam.

Discriminator: Beyond 40–60 minutes = refractory, needs ICU/paralysis.

B) Repeat benzo 3rd	After two doses, move to second-line
C) Intubate + propofol	Refractory stage
D) IV glucose	Not unless indicated
E) Observe	Dangerous

Trap: Looping the benzodiazepine.

Future alert: Status persists >20 min → phenytoin / levetiracetam.

Q26 — Answer & Breakdown

Correct: A) Intubation / ICU admission

Concept: Life-threatening asthma Recall

Why A: Silent chest, drowsy, SpO2 <92%, unable to speak = life-threatening → senior help, ICU, possible intubation.

Discriminator: A silent chest means exhaustion, not improvement.

B) Oral salbutamol	Insufficient at this severity
C) Observe	Fatal delay
D) Discharge	Wrong
E) Antibiotics	Not the primary issue

Trap: Misreading a silent chest as improving.

Future alert: Silent chest / drowsy → life-threatening asthma, ICU.

Q27 — Answer & Breakdown

Correct: A) Severe

Concept: Asthma severity by PEF Recall

Why A: Words only + SpO2 93% + PEF 45% predicted sits in the severe band (PEF 33–50%, cannot complete sentences).

Discriminator: PEF 33–50% = severe; <33% = life-threatening.

B) Mild-moderate	PEF >50%
C) Life-threatening	PEF <33% / silent chest
D) Moderate	PEF >50% and able to talk
E) Resolving	No evidence of that

Trap: Severity by PEF bands.

Future alert: PEF 33–50% + limited speech = severe asthma.

Q28 — Answer & Breakdown

Correct: A) IM epinephrine 0.01 mg/kg of 1:1000 into the anterolateral thigh

Concept: Anaphylaxis emergency Recall

Why A: Immediate IM epinephrine to the thigh, repeat q5–15 min; secure airway, O2, IV fluids.

Discriminator: Hypotension + urticaria + wheeze after exposure.

B) Antihistamine	Adjunct only
C) Corticosteroid	Adjunct only
D) Oxygen only	Insufficient
E) IV fluids only	Not first-line

Trap: Adjunct before epinephrine.

Future alert: Anaphylaxis → IM epinephrine first.

Q29 — Answer & Breakdown

Correct: A) IM is safer with less arrhythmia risk; IV only if cardiac arrest

Concept: Epinephrine route in anaphylaxis Recall

Why A: IV epinephrine risks fatal arrhythmia; the IM thigh gives rapid, safe absorption.

Discriminator: IV is reserved for arrest / refractory cases.

B) IM is faster	Not the reason
C) IM is cheaper	Irrelevant
D) IM is less painful	Irrelevant
E) IM absorbs better	IV would absorb more — the issue is safety

Trap: Route safety.

Future alert: Epinephrine IM, not IV, unless arrest.

Q30 — Answer & Breakdown

Correct: A) Knee-chest position, O₂, morphine, IV fluids, propranolol

Concept: Tetralogy of Fallot "tet" spell Recall

Why A: These raise systemic vascular resistance and reduce RVOT spasm; severe spells need phenylephrine, sedation, bicarbonate.

Discriminator: Crying precipitates spells; the goal is to increase SVR.

B) Prostaglandin E1	For duct-dependent lesions like TGA, not a tet spell
C) Immediate intubation	Not first-line
D) Diuretics	No role
E) Transfusion	No role

Trap: Confusing duct-dependent vs tet spell.

Future alert: Tet spell → knee-chest + increase SVR.

Q31 — Answer & Breakdown

Correct: A) Pulmonary stenosis (RVOT obstruction)

Concept: TOF pathophysiology Recall

Why A: The degree of RVOT obstruction sets the right-to-left shunt and thus the cyanosis severity; the VSD is non-restrictive.

Discriminator: More stenosis = more cyanosis; a "pink tet" has minimal stenosis.

B) VSD	Present but non-restrictive
C) Overriding aorta	Anatomic, not the severity driver
D) RV hypertrophy	A consequence
E) ASD	Not part of TOF

Trap: Picking the wrong defect as the driver.

Future alert: TOF cyanosis ∝ pulmonary stenosis severity.

Q32 — Answer & Breakdown

Correct: A) Prostaglandin E1 to keep the PDA open

Concept: Transposition of the great arteries Recall

Why A: TGA is duct-dependent; PGE1 maintains mixing until an arterial switch.

Discriminator: Egg-on-string + cyanosis from birth + increased pulmonary flow.

B) Arterial switch now	Not the immediate stabilization step
C) High-flow oxygen	Ineffective without mixing
D) Diuretics	No role here
E) Aspirin	No role

Trap: Treating cyanosis with oxygen (ineffective in TGA without mixing).

Future alert: TGA → PGE1 keep the PDA open.

Q33 — Answer & Breakdown

Correct: A) A small defect creates a higher-velocity jet → more turbulence (louder)

Concept: VSD murmur mechanism Interpretation

Why A: A small restrictive VSD gives a high-velocity jet and a loud murmur; a large non-restrictive defect has a low gradient and a softer, earlier-closing murmur.

Discriminator: Loudness is inversely related to size — the paradox.

B) Large defects are always louder	False — the opposite
C) Size has no effect	False
D) Small defects produce no turbulence	False
E) Only shunt volume matters	False

Trap: The VSD loudness paradox.

Future alert: Small VSD = loud murmur (paradox).

Q34 — Answer & Breakdown

Correct: A) Increased RV volume delays pulmonic valve closure

Concept: ASD physiology Interpretation

Why A: The left-to-right shunt increases RV filling so the pulmonary valve closes late and FIXED (it does not shorten with inspiration).

Discriminator: Fixed split = ASD; a wide but variable split suggests pulmonary stenosis.

B) Mitral regurgitation	Does not produce a split S2
C) Tricuspid regurgitation	No
D) Aortic stenosis	No
E) PDA	Gives a continuous murmur

Trap: Confusing the cause of the split.

Future alert: Fixed split S2 = ASD.

Q35 — Answer & Breakdown

Correct: A) Indomethacin or ibuprofen (inhibits prostaglandin synthesis)

Concept: Preterm PDA closure Recall

Why A: A symptomatic preterm PDA closes medically with a COX inhibitor; surgery is for failures.

Discriminator: Term PDAs are often asymptomatic; preterms are symptomatic.

B) Surgical ligation first	Not first-line
C) Prostaglandin E1	Opens the duct — the opposite
D) Furosemide	For CHF, not closure
E) Observation	Risky in a symptomatic preterm

Trap: Opening vs closing reversal.

Future alert: Preterm PDA → indomethacin / ibuprofen.

Q36 — Answer & Breakdown

Correct: A) Collateral circulation via intercostal arteries (coarctation)

Concept: Coarctation signs Interpretation

Why A: Upper-limb hypertension + weak delayed femoral pulses + rib notching (erosion by collateral intercostals) = coarctation.

Discriminator: Notching means collaterals — think coarctation in an older child with a BP discrepancy.

B) TOF	Cyanotic, no notching
C) TGA	Cyanotic newborn
D) ASD	No notching
E) PDA	No notching

Trap: Missing coarctation in an older child.

Future alert: Upper HTN + weak femoral pulse + rib notching = coarctation.

Q37 — Answer & Breakdown

Correct: A) Yes — threshold for 6 months–5 years is <11 g/dL

Concept: Anemia thresholds by age Recall

Why A: Anemia is Hb <11 (6mo–5yr), <11.5 (5–11yr), <12 (12–14yr); this child is below the band.

Discriminator: The threshold shifts by age band.

B) Normal	Below the band
C) Polycythemia	No
D) Borderline only if <10	Too low a cutoff
E) Cannot be determined	It can

Trap: Wrong age-band threshold.

Future alert: Anemia at 6mo–5yr if Hb <11.

Q38 — Answer & Breakdown

Correct: A) Iron deficiency anemia

Concept: Microcytic anemia differentiation Interpretation

Why A: Exclusive breastfeeding past 6 months without iron + low ferritin + high TIBC + pencil cells = IDA.

Discriminator: Low ferritin + high TIBC = iron deficiency; thalassemia has normal/high ferritin.

B) Beta-thal trait	Normal/high ferritin, target cells, formula
C) Chronic disease	Low iron, LOW TIBC
D) Lead poisoning	Basophilic stippling
E) Normal variant	Not normal

Trap: IDA vs thalassemia trait.

Future alert: Low ferritin + high TIBC = IDA.

Q39 — Answer & Breakdown

Correct: A) 3–5 days

Concept: Iron-therapy response Recall

Why A: Reticulocytosis peaks at 3–5 days; Hb rises ~1 g/dL per week, normalizes in 6–8 weeks, then continue 3 months.

Discriminator: Reticulocytes rise early, Hb later.

B) Within 24 hours	Too soon
C) 2 weeks	Hb not yet normalized
D) 1 month	Later than the reticulocyte peak
E) Never	False

Trap: Timing of the response.

Future alert: Iron → reticulocytes rise in 3–5 days.

Q40 — Answer & Breakdown

Correct: A) Beta-thalassemia major

Concept: Hemoglobinopathy presentation Interpretation

Why A: Failure to thrive + hepatosplenomegaly + chipmunk facies + high HbF + target cells and nucleated RBCs at 8 months = Cooley's.

Discriminator: Presents after 6 months when HbF falls; high HbF is the clue.

B) Iron deficiency	Microcytic but no HbF/facies
C) Sickle cell	Sickled cells, not high HbF picture
D) G6PD	Episodic hemolysis
E) Lead poisoning	No

Trap: Presents only after 6 months.

Future alert: FTT + hepatosplenomegaly + high HbF = thalassemia major.

Q41 — Answer & Breakdown

Correct: A) Aplastic crisis (Parvovirus B19)

Concept: Sickle-cell complications Interpretation

Why A: Sudden anemia + severe reticULOcytopenia + splenomegaly after a URI = transient aplastic crisis; Parvo B19 suppresses erythropoiesis.

Discriminator: LOW retics (vs sequestration: HIGH retics).

B) Vaso-occlusive crisis	Pain, HIGH retics
C) Splenic sequestration	HIGH retics, sudden splenic enlargement
D) Acute chest	Fever + chest symptoms
E) Stroke	Neurological deficit

Trap: Aplastic (low retics) vs sequestration (high retics).

Future alert: Sickle + sudden anemia + LOW retics = aplastic crisis.

Q42 — Answer & Breakdown

Correct: A) Fava beans

Concept: G6PD trigger identification Recall

Why A: Fava beans and oxidative drugs precipitate hemolysis; smear shows bite cells and Heinz bodies.

Discriminator: Episodic jaundice after fava / drugs is the signature.

B) Cow's milk	Not a trigger
C) Iron deficiency	Unrelated
D) Viral infection only	Fava is also a trigger
E) None of the above	Fava is the trigger

Trap: Missing the trigger.

Future alert: Hemolysis after fava = G6PD.

Q43 — Answer & Breakdown

Correct: A) Pre-renal (70% of pediatric AKI)

Concept: AKI types Interpretation

Why A: Concentrated urine (Na <20, BUN/Cr >20:1) that responds to fluids = pre-renal dehydration.

Discriminator: Intrinsic AKI has FENa >2 and muddy-brown casts.

B) Intrinsic (ATN)	FENa >2, muddy casts
C) Post-renal	Obstruction
D) Chronic	Chronic changes
E) None	Pre-renal fits

Trap: Pre-renal vs intrinsic.

Future alert: Pre-renal AKI = low Na, high BUN/Cr, responds to fluids.

Q44 — Answer & Breakdown

Correct: A) Antibiotics (may worsen HUS)

Concept: STEC-HUS management Recall

Why A: Avoid antibiotics and antimotility agents in STEC-HUS; treatment is supportive (fluids, dialysis, transfusion as needed).

Discriminator: Bloody diarrhea + MAHA + thrombocytopenia + AKI.

B) Fluid/electrolyte support	Do this
C) Transfusion if severe	Do this
D) Dialysis if indicated	Do this
E) Supportive care	Do this

Trap: Giving harmful antibiotics.

Future alert: STEC-HUS → avoid antibiotics.

Q45 — Answer & Breakdown

Correct: A) Oral prednisolone 60 mg/m²/day for 4–6 weeks, then taper

Concept: Nephrotic syndrome treatment Recall

Why A: Steroid-sensitive NS responds to high-dose prednisolone followed by a taper; relapses use the same approach.

Discriminator: Edema + heavy proteinuria + hypoalbuminemia + hyperlipidemia.

B) Antibiotics	No role
C) Diuretic monotherapy	No
D) ACE inhibitor only	No
E) Plasmapheresis	Steroid-resistant only

Trap: Under-treatment.

Future alert: First nephrotic episode → prednisolone 60 mg/m².

Q46 — Answer & Breakdown

Correct: A) After fluids, at 0.05–0.1 U/kg/hr IV

Concept: DKA management sequence Recall

Why A: Fluids come first (20 mL/kg bolus if shock), then an insulin infusion; a bolus before fluids risks cerebral edema.

Discriminator: Insulin after fluids; replace potassium as needed.

B) Immediate IV bolus before fluids	Risks cerebral edema
C) Only after 24 hours	Too late
D) Oral hypoglycemic	DKA needs IV insulin
E) Not needed	Wrong

Trap: Insulin before fluids → cerebral edema.

Future alert: DKA → fluids before insulin.

Q47 — Answer & Breakdown

Correct: A) TSH on heel-prick at 3–5 days

Concept: Newborn screening Recall

Why A: TSH on the heel-prick at 3–5 days (after maternal thyroid hormone clears) catches congenital hypothyroidism and prevents cretinism.

Discriminator: At birth TSH is unreliable because of maternal hormone.

B) At birth	Unreliable
C) T4 at 1 month	Too late
D) Ultrasound at 6 months	No
E) Clinical exam alone	Misses asymptomatics

Trap: Timing of the screen.

Future alert: Congenital hypo screen = TSH heel-prick at 3–5 days.

Q48 — Answer & Breakdown

Correct: A) Endocrine cause (GH deficiency)

Concept: Short-stature differentiation Interpretation

Why A: Low velocity + delayed bone age + normal parents + no illness = endocrine (GH deficiency); familial has normal bone age, constitutional has delayed puberty.

Discriminator: Growth velocity is the key metric.

B) Familial	Parents short, bone age normal
C) Constitutional	Delayed puberty, catch-up later
D) Psychosocial	History of deprivation
E) Malnutrition	Low weight, not this pattern

Trap: Distinguishing causes by velocity/bone age.

Future alert: Low velocity + delayed bone age = endocrine short stature.

Q49 — Answer & Breakdown

Correct: A) Thorough feeding and social history plus a growth-chart plot

Concept: Failure to thrive evaluation Recall

Why A: The first step is a careful intake and psychosocial history with plotting; this separates organic from non-organic.

Discriminator: Do not jump to tests before the history.

B) Endocrine workup first	Premature
C) Admit for IV feeds	After diagnosis
D) Refer to surgery	No role
E) Reassure	Misses the cause

Trap: Over-investigation before the history.

Future alert: FTT → history + growth plot first.

Q50 — Answer & Breakdown

Correct: A) Atrial septal defect

Concept: Cardiac-exam buzzword Recall

Why A: A widely split S2 that does not vary with inspiration is pathognomonic of ASD (see Q34).

Discriminator: Wide fixed split = ASD.

B) VSD	Holosystolic murmur
C) PDA	Continuous murmur
D) TOF	Single S2
E) Mitral regurgitation	Holosystolic murmur

Trap: Buzzword mapping.

Future alert: Fixed split S2 = ASD.

Pediatrics

Contents

Neonatology

1.1 APGAR Score — Most Asked in Vivas

APGAR Timing & Prognostic Significance

Sarnat Staging of Hypoxic-Ischemic Encephalopathy (HIE)

1.2 Neonatal Resuscitation — Golden Minute Algorithm

1.3 Neonatal Jaundice — Classification is Key

Causes by Timing

Investigations

Management

1.4 Birth Injuries

1.5 Rh Incompatibility & TORCH Infections

TORCH Infections

1.6 Neonatal Respiratory Distress

1.7 Neonatal Hypoglycemia

Growth & Development

2.1 Weight, Height, Head Circumference

2.2 Developmental Milestones

2.3 Puberty & Growth

Nutrition

3.1 Breastfeeding

3.2 Vitamin Deficiencies

3.3 Protein-Energy Malnutrition

Infectious Diseases

4.1 Measles

4.2 Rubella (German Measles)

4.3 Chickenpox (Varicella)

4.4 Scarlet Fever

4.5 Kawasaki Disease

4.6 Pertussis (Whooping Cough)

4.7 Diphtheria

4.8 Tetanus

4.9 Poliomyelitis

4.10 Mumps

4.11 Tonsillopharyngitis

4.12 Croup (Laryngotracheobronchitis)

4.13 Epiglottitis

4.14 Bronchiolitis

4.15 Pneumonia

4.16 Tuberculosis in Children

4.17 Meningitis in Children

4.18 Urinary Tract Infection

4.19 Acute Gastroenteritis & Dehydration

4.20 Worm Infestations

Neurology

5.1 Febrile Seizures

5.2 Status Epilepticus

Respiratory & Allergy

6.1 Acute Severe Asthma (Status Asthmaticus)

6.2 Anaphylaxis

Congenital Heart Diseases

7.1 Classification

7.2 Tetralogy of Fallot (Most common cyanotic CHD)

7.3 Transposition of Great Arteries (TGA)

7.4 Ventricular Septal Defect

7.5 Atrial Septal Defect

7.6 Patent Ductus Arteriosus

7.7 Coarctation of Aorta

Hematology

8.1 Anemia in Children

8.2 Iron Deficiency Anemia

8.3 Thalassemia

Beta-Thalassemia Major (Cooley Anemia)

Beta-Thalassemia Minor (Trait)

Alpha-Thalassemia

8.4 Sickle Cell Disease

8.5 G6PD Deficiency

Nephrology

9.1 Acute Kidney Injury

9.2 Hemolytic Uremic Syndrome (HUS)

9.3 Nephrotic Syndrome

Endocrine

10.1 Diabetes Mellitus Type 1

10.2 Congenital Hypothyroidism

10.3 Short Stature

Viva Topics

11.1 Tanner Staging (Sexual Maturity Rating)

11.2 Developmental Milestones Quick Reference

11.3 Birth Weight Milestones