OCCULT PULMONARY ABNORMAliTIES IN ASTHMATIC CHILDREN 361 Occult Pulmonary Abnormalities in Asymptomatic Asthmatic Children*
نویسنده
چکیده
The pulmonary status of 178 asymptomatic asthmatic children with normal time-volume spirograms was further evaluated using flow-volume loops, body plethysmographic studies, and blood gas tensions in arterialized capillary blood. Residual volume (RV) was abnormal in 26 percent, total lung capacity (TLC) in 33 percent, RV/TLC % in 41 percent, and arterial oxygen pressure in 23 percent of them. All values for expiratory flow measured relative to observed vital capacity (VC), (ie, the forced expiratory volume in one second (FEy1 ], the mean forced expiratory flow during the middle half of the forced vital capacity (FEF25-75% ; FVC], the FEV1/VC,
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