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Discriminating Measures and Normal Values for Expiratory Obstruction
Posted in September 27th, 2014
Published in Pulmonary Function
Tags: demographic analysis, FEV3/FVC, forced expiratory flow rates, obstructive airways disease, reference values, smoking, spirometry
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Since Hutchinson introduced spirometry in 1846, a multitude of measurements, including volumes, flows, time constants, and ratios, have evolved to assess normalcy and disease. Five decades ago Lueallan and Fowler2 added maximal midexpiratory flow, later labeled as forced expiratory flow, midexpiratory phase (FEF25-75), to assess expiratory airway obstruction. In 1967, Macklem and Mead divided airway […]
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