'Salbuterol inhaler' presentation slideshows

Lung had about 5.5 Liters at start o f the forced expiratory effort (downward arrow)

Express FEV1 as percent of VC (vital capacity ) in part to scale up/down and account for a person being larger or smaller (large or small vital capacity) than average male/female. IF %FEV1 is greater than 80%, then they are healthy with open airways/low resistance to flow.

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