Premium
Effect of forced expiration on thoracic gas volume in wheezy infants
Author(s) -
Lanteri Celia J.,
Raven Joan M.,
Sly Peter D.
Publication year - 1990
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.1950090406
Subject(s) - expiration , plethysmograph , medicine , vital capacity , lung volumes , pulmonary function testing , volume (thermodynamics) , anesthesia , lung function , cardiology , respiratory system , lung , diffusing capacity , physics , quantum mechanics
Partial expiratory flow‐volume curves are commonly used in infant pulmonary function testing. The flow measurements are volume dependent and thoracic gas volume (TGV) is often measured in conjunction with forced expiratory maneuvers. Since it is not possible to make continuous, simultaneous measurements of TGV during forced expiration, it is assumed that lung volume returns to its original value after forced expiration. To test this assumption we measured TGV using a whole body plethysmograph in 14 wheezy infants before and after a series of forced expirations produced with an inflatable jacket. Forced expiration did not cause a significant change in group mean TGV measurements. Examination of individual data did not show any systematic difference between TGV measured before and after forced expiration. These results suggest that repeated forced expirations do not alter TGV within the time scale of usual pulmonary function testing protocols. Pediatr Pulmonal 1990; 9:220–223 .