Assessment of Changes in Airway Calibre—Tests of Forced Expiration
Analysis of the forced expiratory spirogram was introduced by Tiffeneau & Pinelli in 1947 as an empirical substitute for measuring the maximum breathing capacity (maximum voluntary ventilation over 15 s). The original analysis was made from the record of volume change versus time, but an alternative method of registering forced expiration, the maximum expiratory flow-volume (MEFV) curve (Hyatt, Schilder & Fry, 1958; Hyatt & Black, 1973), has been widely used in the last 10 years. These two methods of depicting forced expiration and the measurements most frequently made from them are shown schematically in Figure 1.
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