Pediatric Emergency Medicine: Stabilization, Physiology, and High-Risk Presentations
Core concepts
Pediatric emergency medicine rewards mastery of age-specific physiology and a disciplined resuscitation sequence. Know weight-based dosing and equipment sizing (length-based tapes are a practical shortcut), the age-dependent normal ranges for heart rate and respiratory rate, and the fact that hypotension is a late finding in children. Recognize compensated shock (tachycardia, delayed capillary refill, narrow pulse pressure) before decompensation. Understand the pediatric airway: larger occiput, relatively large tongue, floppy epiglottis, narrowest point at the cricoid, and higher oxygen consumption-so preoxygenation and early airway planning matter.
Common traps
Questions often hinge on distinguishing bronchiolitis from asthma, recognizing that a quiet child with respiratory distress is deteriorating, and not anchoring on fever source without examining the whole child. Another frequent trap is interpreting a normal blood pressure as reassuring in a child with other shock signs. Also watch for age cutoffs (e.g., febrile infant workup strategies differ by weeks of life) and for medication errors from adult dosing habits.
Worked example
A 9-month-old with 3 days of rhinorrhea, wheeze, and subcostal retractions, HR 180, RR 60, SpO2 90% on room air, mild dehydration. This is bronchiolitis with impending respiratory failure. Management: gentle suctioning, humidified oxygen to keep SpO2 adequate, trial of high-flow nasal cannula, cautious fluids, and avoidance of routine bronchodilators or steroids. Escalate to respiratory support early rather than waiting for bradycardia or apnea. Rule of thumb: in infants, tachypnea plus retractions plus poor feeding equals a respiratory emergency even if the oxygen saturation looks acceptable.
Exam strategy
Prioritize ABCs, then identify the physiologic category (respiratory vs. shock vs. neurologic). Read the vital signs against age norms before choosing an answer.