Master Paediatrics
for PMDC NLE Step 1

What the PMDC NLE Step 1 Tests in Paediatrics

Paediatrics in the PMDC NLE Step 1 tests the ability to recognise and manage common paediatric presentations from birth through adolescence, with emphasis on growth and development milestones, neonatal resuscitation (APGAR scoring, meconium aspiration), congenital heart diseases (VSD, TOF, PDA), infectious diseases (measles, pertussis, meningitis), and nutritional deficiencies (rickets, iron deficiency anaemia). Candidates must apply standardised growth charts (WHO), vaccination schedules (EPI), and paediatric drug dosing (e.g., paracetamol 15 mg/kg/dose). Questions often require differentiation of surgical from medical conditions (e.g., intussusception vs. gastroenteritis) and knowledge of age-specific vital signs and red flags (e.g., fever without source in infants <3 months). Clinical reasoning is tested through vignettes requiring immediate management decisions, such as when to start IV antibiotics or perform lumbar puncture.

High-Yield Concepts

• APGAR Score: Assessed at 1 and 5 minutes after birth; components: Appearance (pink all over = 2, acrocyanosis = 1, pale/blue = 0), Pulse (>100 = 2, <100 = 1, absent = 0), Grimace (cough/sneeze = 2, grimace = 1, no response = 0), Activity (flexed/active = 2, some flexion = 1, limp = 0), Respiration (strong cry = 2, weak cry = 1, absent = 0). Score <3 at 5 minutes indicates severe depression; immediate resuscitation needed.
• Growth Milestones (WHO): Head circumference measured until 2 years; weight loss >7% in first week indicates dehydration risk. Key percentiles: 50th for weight at 1 year = 10 kg, at 2 years = 12.5 kg. Height doubles by 4 years. Failure to thrive defined as weight <3rd percentile or crossing two major centile lines downward.
• Ventricular Septal Defect (VSD): Most common congenital heart defect. Small VSD: loud holosystolic murmur at LLSB, may close spontaneously. Large VSD: presents at 4-8 weeks with tachypnoea, failure to thrive, and bounding pulses. First-line treatment: surgical closure if symptomatic or pulmonary hypertension develops.
• Intussusception: Classic triad: colicky abdominal pain, red-currant jelly stools, and palpable sausage-shaped mass. Peak age 3-12 months. Diagnosis by ultrasound (target sign). First-line treatment: air enema reduction (success rate >80%). Surgical referral if peritonitis or perforation suspected.
• Febrile Seizure: Age 6 months to 5 years; simple febrile seizure: generalised, <15 minutes, no recurrence within 24 hours. Lumbar puncture indicated if meningeal signs, or in <12 months with incomplete vaccination. No long-term anticonvulsants needed; manage fever with paracetamol/ibuprofen.
• Acute Otitis Media: Diagnosed by acute onset, middle ear effusion (bulging tympanic membrane), and otalgia. First-line: amoxicillin 80-90 mg/kg/day for 5-7 days. In penicillin allergy: cefdinir or azithromycin. Watchful waiting for 48-72 hours in non-severe cases >6 months.
• Iron Deficiency Anaemia: Most common anaemia in children. Risk factors: preterm, exclusive breastfeeding >6 months without iron supplementation. Diagnosis: Hb <11 g/dL (age 6 months-5 years), low MCV, low ferritin. Treatment: ferrous sulfate 3-6 mg/kg/day elemental iron; response with Hb rise >1 g/dL in 4 weeks.
• Meconium Aspiration Syndrome: Occurs in term/post-term infants with fetal distress. Presents with respiratory distress, barrel chest, and meconium-stained amniotic fluid. Management: immediate suction of mouth and nose after delivery (NOT deep tracheal suction if vigorous), then CPAP or mechanical ventilation, surfactant if needed.

Common Traps in Paediatrics Questions

• Confusing APGAR scoring at 1 minute with need for resuscitation; resuscitation is based on breathing and heart rate, not APGAR alone.
• Assuming all children with fever and petechiae have meningococcal sepsis; remember to rule out idiopathic thrombocytopenic purpura (ITP) and viral exanthems.
• Using adult vital sign thresholds in children; e.g., normal systolic BP in a 1-year-old is ~80 + (2 x age in years) mmHg.
• Forgetting that paracetamol dosing is 15 mg/kg/dose (max 60 mg/kg/day) and ibuprofen is 10 mg/kg/dose (max 40 mg/kg/day); overdosing common in exam scenarios.
• Misdiagnosing pyloric stenosis as gastro-oesophageal reflux; pyloric stenosis presents with non-bilious projectile vomiting at 3-6 weeks, palpable olive, and hypochloraemic metabolic alkalosis.
• Overlooking that BCG vaccine is given at birth in Pakistan (EPI schedule) and can cause false-positive Mantoux test; use IGRA instead.

How to Revise Paediatrics for the PMDC NLE Step 1

Focus on neonatal and infant topics: APGAR, resuscitation, congenital heart disease, and common infections (pneumonia, meningitis, gastroenteritis). Master the EPI vaccination schedule (BCG, OPV, pentavalent, PCV, rotavirus, measles) and know contraindications (e.g., live vaccines in immunodeficiency). Questions are clinical vignettes requiring stepwise management: first stabilise (ABC), then diagnose (specific history/exam), then treat (first-line drugs/surgery). Practise interpreting growth charts and calculating paediatric drug doses under time pressure. Memorise red flags for serious illness (e.g., bulging fontanelle, neck stiffness, purpura). Review British guidelines (NICE) for feverish illness in children and jaundice management. Do not neglect surgical causes (intussusception, hypertrophic pyloric stenosis, testicular torsion) as they appear frequently.

Practise it: MedLumen has 50 Paediatrics questions for the PMDC NLE Step 1, each with a full explanation and references.