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Figure 26-13
Partial expiratory flow-volume curves before (A) and
after (B) bronchodilator treatment. Forced expiration is begun just above midpoint
of vital capacity (VC). Flows are quantitated at 20% and 40% of VC above residual
volume (RV). A reference maximum expiratory curve (C) is also inscribed by beginning
exhalation from total lung capacity (TLC).
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