The main breathing abnormalities are:

FEV1 is the forced expiratory volume of air in 1 second. FEV1/FVC measures the amount of a person’s vital lung capacity that they can expel in the first second of an expiration. Markers for stage one are an FEV1/FVC of more than 70% a normal FEV1/FVC and an FEV1 above 80% of normal. 2. COPD … ................
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