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Which condition shows a decreased FEV1 to FVC. ratio?
Spirometry Simplified: Flow-Volume Loops You Must Know!
Quick guide to Obstructive vs Restrictive patterns:
🟥 Obstructive Lung Disease (e.g., C.O.P.D.):
• F.E.V. one ↓↓↓
• F.V.C. ↓
• F.E.V. one / F.V.C. ratio < 0.7
• ↑ Residual volume, ↑ Total lung capacity
→ “Air trapping — can’t get air out”
🟨 Restrictive Lung Disease (e.g., Pulmonary fibrosis):
• F.E.V. one ↓
• F.V.C. ↓
• F.E.V. one / F.V.C. ratio ≥ 0.7
→ “Lung can’t expand — everything ↓”
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