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EIB — RACP Paediatrics MCQ

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ModerateRespiratoryEIBRACP Paediatrics

A 15-year-old runner develops wheeze 5-10 minutes after starting exercise. Pre-exercise spirometry is normal. Post-exercise spirometry shows 15% fall in FEV1. What is the most likely diagnosis?

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Correct answer: C — Exercise-induced bronchoconstriction

A ≥10-15% fall in FEV1 after exercise challenge confirms exercise-induced bronchoconstriction. First-line is SABA pre-exercise; if frequent, consider ICS maintenance.

Reference: National Asthma Council Australia – 2022; RCH Melbourne – 2023