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Exercise-induced laryngeal obstruction — SCE Respiratory MCQ

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ModerateRespiratory PhysiologyExercise-induced laryngeal obstructionSCE Respiratory

A 37-year-old woman has suspected dysfunctional breathing. Spirometry is normal. Flow-volume loop shows flattening of the inspiratory limb with preserved expiratory limb, and symptoms occur during exercise with throat tightness. What is the most likely diagnosis?

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Correct answer: B — Exercise-induced laryngeal obstruction

Inspiratory loop flattening with exertional throat tightness suggests variable extrathoracic obstruction such as exercise-induced laryngeal obstruction. Fixed tracheal stenosis typically flattens both inspiratory and expiratory limbs. COPD and ILD would produce obstructive or restrictive physiological patterns rather than isolated inspiratory flattening.

Reference: BTS/ARTP pulmonary function standards; ERS inducible laryngeal obstruction statement