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What features on PFT or flow-volume loops do you look at to suspect small airway dysfunction?
Often distal flattening of expiratory limb or decreased Fev25-50/FVC is referred for small airway dysfunction but it is advised against using it give low clinical utility/accuracy.
Answer from: at Academic Institution
I would strongly advise against using the flow-volume loop to diagnose small airway dysfunction. It is difficult if not impossible to visually distinguish between small airway dysfunction and normal aging (I would point out that part of normal aging involves changes in small airway function). Althou...
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