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Obstructive spirometry – asthma — RACP Paediatrics MCQ

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EasyRespiratoryObstructive spirometry – asthmaRACP Paediatrics

A 10-year-old with asthma has spirometry showing FEV1 72% predicted, FVC 95% predicted, and FEV1/FVC ratio 0.65. After salbutamol, FEV1 improves to 88% predicted (22% improvement). What is the spirometry interpretation?

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Correct answer: E — Obstructive pattern with reversibility

FEV1/FVC ratio below the lower limit of normal (<0.80 in children) with reduced FEV1 and normal FVC indicates an obstructive pattern. Improvement in FEV1 ≥12% and ≥200 mL after bronchodilator demonstrates reversibility, confirming asthma. This is the hallmark spirometric pattern of asthma.

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