Master Specialist Pediatrics (PED5391)
for DHA Speciality

Core Concepts

Specialist Pediatrics requires a robust understanding of age-specific physiology, pathology, and management. Core concepts include:

• Growth & Development: Mastery of normal developmental milestones (gross motor, fine motor, language, social-emotional), use of standardized growth charts (WHO for <2 years, CDC for >2 years), and recognition of failure to thrive (FTT) or developmental delay/regression.
• Immunization: Comprehensive knowledge of national (DHA) and international vaccination schedules, contraindications, adverse effects, and catch-up schedules.
• Fluid & Electrolyte Management: Pediatric-specific calculations for maintenance fluids (e.g., Holliday-Segar formula), deficit replacement, and recognition/management of common imbalances (dehydration, hypernatremia, hyponatremia, hyperkalemia).
• Pharmacology: Age and weight-based dosing, understanding of drug metabolism and excretion differences in children, and awareness of drug-drug interactions.
• Neonatology: APGAR scoring, newborn screening programs (e.g., metabolic disorders, hearing), common neonatal conditions (jaundice, respiratory distress syndrome, sepsis), and resuscitation principles.
• Ethics & Safeguarding: Principles of assent and consent in minors, confidentiality, reporting child abuse/neglect, and best interest decisions.
• Common Emergencies: Recognition and initial management of pediatric shock, respiratory failure, status epilepticus, and severe allergic reactions.

Clinical Presentation

• Respiratory Distress: Tachypnea, nasal flaring, retractions (subcostal, intercostal, suprasternal), grunting, stridor, wheezing, cyanosis (indicates severe disease: bronchiolitis, asthma, pneumonia, croup, foreign body aspiration).
• Altered Mental Status: Lethargy, irritability, poor feeding, focal neurological deficits, seizures (meningitis, encephalitis, metabolic encephalopathy, head trauma, poisoning).
• Fever: In neonates (<3 months) always consider sepsis until proven otherwise. In older children, differentiate between benign viral illness and serious bacterial infection (UTI, pneumonia, osteomyelitis).
• Abdominal Pain & Vomiting: Bilious vomiting (surgical emergency: malrotation with volvulus, intussusception, Hirschsprung's), projectile non-bilious vomiting (pyloric stenosis), periumbilical pain migrating to right lower quadrant (appendicitis).
• Failure to Thrive (FTT): Weight <3rd percentile or crossing two major percentile lines downwards (inadequate intake, malabsorption, increased metabolic demand, genetic syndromes).
• Cardiac Symptoms: Cyanosis, murmur, poor feeding, sweating with feeds, poor weight gain, exercise intolerance (congenital heart disease, heart failure).
• Jaundice: Neonatal jaundice (physiologic vs. pathologic - direct hyperbilirubinemia always pathological, consider biliary atresia).
• Developmental Delay/Regression: Loss of previously acquired skills or significant delay in reaching milestones (neurodevelopmental disorders, metabolic diseases, genetic syndromes, brain tumors).

Diagnosis (Gold Standard)

Identifying the definitive diagnostic test is crucial for many pediatric conditions.

• Cystic Fibrosis: Sweat Chloride Test (≥ 60 mEq/L, repeat if equivocal).
• Hirschsprung's Disease: Rectal Biopsy (absence of ganglion cells in submucosal and myenteric plexuses).
• Congenital Adrenal Hyperplasia (CAH): Elevated 17-hydroxyprogesterone (17-OHP) on newborn screening, confirmed by specific enzyme assays.
• Type 1 Diabetes Mellitus: Fasting Plasma Glucose ≥ 126 mg/dL OR Random Plasma Glucose ≥ 200 mg/dL with symptoms OR HbA1c ≥ 6.5%.
• Asthma: Spirometry with demonstration of bronchodilator reversibility (increase in FEV1 or FVC by >12% or 200mL) for children >5-6 years. Clinical diagnosis for younger children.
• Urinary Tract Infection (UTI): Urine Culture (colony count >50,000 CFU/mL from catheter sample or >100,000 CFU/mL from clean catch). Suprapubic aspirate is gold standard for infants.
• Iron Deficiency Anemia: Serum Ferritin (low), microcytic hypochromic red cells on peripheral smear, low MCV.
• Sepsis (Neonatal/Pediatric): Positive Blood Cultures, although empirical antibiotics are started before results. Lumbar puncture for CSF culture if meningitis suspected.

Management (First Line)

First-line management for critical pediatric conditions:

• Sepsis/Septic Shock: Immediate broad-spectrum IV antibiotics, aggressive IV fluid resuscitation (20 mL/kg boluses), vasopressors if fluid refractory.
• Status Epilepticus: IV Lorazepam (0.1 mg/kg) or Midazolam (intranasal/buccal 0.2-0.3 mg/kg), followed by a second-line agent if seizures persist.
• Anaphylaxis: Intramuscular Epinephrine (0.01 mg/kg, max 0.5 mg) repeated every 5-15 minutes as needed.
• Acute Asthma Exacerbation: Inhaled short-acting beta-agonists (SABA) like Salbutamol, systemic corticosteroids (oral Prednisolone). Oxygen if hypoxemic.
• Diabetic Ketoacidosis (DKA): IV fluids (0.9% NaCl), continuous IV insulin infusion (0.1 units/kg/hr), careful electrolyte monitoring and replacement (especially potassium).
• Dehydration: Oral Rehydration Solution (ORS) for mild/moderate. IV fluids (isotonic solution boluses for severe dehydration/shock, then maintenance with deficit replacement).
• Bronchiolitis (viral): Primarily supportive care (hydration, oxygen supplementation if SpO2 <90%), nasal suctioning. No routine bronchodilators or steroids.
• Child Abuse/Neglect: Immediate reporting to relevant child protective services, ensuring the child's safety, and thorough documentation.

Exam Red Flags