In a neonate requiring tracheal intubation, which anatomical feature of the paediatric larynx differs most significantly from adults and determines correct ETT placement?
- A The paediatric glottis is at C6–C7 level vs C4–C5 in adults
- B The paediatric epiglottis is U-shaped and shorter than in adults
- C The narrowest point of the paediatric airway is the subglottic cricoid ring (circular), not the glottis, necessitating uncuffed or low-cuff ETT to avoid mucosal injury ✓
- D The paediatric vocal cords are horizontal rather than oblique
Explanation
In children under 8 years, the narrowest part of the airway is the subglottic region at the level of the cricoid cartilage, which forms a complete ring. Unlike the adult larynx where the narrowest part is the glottis, this circular cricoid ring means that even slight mucosal oedema causes proportionally greater airway compromise (Poiseuille's law: resistance ∝ 1/r4). This is why uncuffed ETTs or high-volume low-pressure cuffed tubes (not inflated or minimally inflated) with appropriate leak at 20–25 cmH2O are used. The paediatric epiglottis is characteristically long, omega-shaped (Ω), and floppy, requiring a straight Miller blade to lift it directly.
Reference: Morgan & Mikhail's Clinical Anesthesiology, 6th ed.
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Written and medically reviewed by the StethoPrep medical team.