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Restrictive spirometry — RACP Paediatrics MCQ

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ModerateRespiratoryRestrictive spirometryRACP Paediatrics

A 12-year-old with neuromuscular disease has spirometry showing FEV1 55% predicted, FVC 50% predicted, and FEV1/FVC ratio 0.90. Total lung capacity on plethysmography is reduced. What is the spirometry pattern?

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Correct answer: B — Restrictive pattern

Proportionally reduced FEV1 and FVC with a preserved or increased FEV1/FVC ratio and reduced TLC on plethysmography indicates a restrictive pattern. In neuromuscular disease, this reflects reduced lung volumes due to respiratory muscle weakness. FVC is a key monitoring parameter for disease progression and decisions about non-invasive ventilation.

Reference: RCH Melbourne – 2023 – Neuromuscular Respiratory CPG; RACP Paediatric Curriculum – Respiratory