Abstract:
: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%, total lung capacity (TLC) in 33%, RV/TLC% in 41%, and arterial oxygen pressure in 23% of them. All values for expiratory flow measured relative to observed vital capacity (VC), (ie, the forced expiratory volume in one second [FEV1], the mean forced expiratory flow during the middle half of the forced vital capacity [FEF25-75%; FVC], FEV1/VC, and the instantaneous forced expiratory flow after 75% and after 50% of the FVC has been exhaled) were normal, and VC was subnormal in only five instances, but flow rates measured relative to TLC were abnormal in 26% of the patients. Some abnormality of pulmonary function was present in all but 13% of these asymptomatic children. Reliance upon conventional evaluation of pulmonary function by forced expiratory spirograms and freedom from wheezing may frequently give the clinician a false impression of the true conditon of the lungs of the asthmatic child.
journal_name
Chestjournal_title
Chestauthors
Cooper DM,Cutz E,Levison Hdoi
10.1378/chest.71.3.361subject
Has Abstractpub_date
1977-03-01 00:00:00pages
361-5issue
3eissn
0012-3692issn
1931-3543pii
S0012-3692(16)40389-2journal_volume
71pub_type
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