Evaluation of a forced oscillation method to measure thoracic gas volume

Unité 14 de Physiopathologie Respiratoire, Institut National de la Santé et de la Recherche Médicale, Université H. Poincaré Nancy I, 54500 Vandoeuvre-les-Nancy, France The purpose of this study was to test a plethysmographic method of measuring thoracic gas volume (TGV) that, contrary to the usual...

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Bibliographic Details
Published in:Journal of applied physiology (1985) 1998-03, Vol.84 (3), p.862-867
Main Authors: Peslin, R, Duvivier, C
Format: Article
Language:English
Subjects:
Air breathing
Airway Resistance - physiology
Biological and medical sciences
Computer Simulation
Fundamental and applied biological sciences. Psychology
Humans
Lung Volume Measurements - methods
Plethysmography, Whole Body
Pulmonary Alveoli - anatomy & histology
Pulmonary Alveoli - physiology
Reference Values
Reproducibility of Results
Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics
Thorax - anatomy & histology
Thorax - physiology
Vertebrates: respiratory system
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Summary:Unité 14 de Physiopathologie Respiratoire, Institut National de la Santé et de la Recherche Médicale, Université H. Poincaré Nancy I, 54500 Vandoeuvre-les-Nancy, France The purpose of this study was to test a plethysmographic method of measuring thoracic gas volume (TGV) that, contrary to the usual panting method, would not require any active cooperation from the subject. It is based on the assumption that the out-of-phase component of airway impedance varies linearly with frequency. By using that assumption, TGV may be computed by combining measurements of total respiratory impedance (Zrs) and of the relationship between the plethysmographic signal (Vpl) and airway flow ( ) during forced oscillations at several frequencies. Zrs and Vpl/ were measured at 10 noninteger multiple frequencies ranging from 4 to 29 Hz in 15 subjects breathing gas in nearly BTPS conditions. Forced oscillation measurements were immediately followed by determination of TGV by the standard method. The data were analyzed on different frequency ranges, and the best agreement was seen in the 6- to 29-Hz range. Within that range, forced oscillation TGV and standard TGV differed little (3.92 ± 0.66 vs. 3.83 ± 0.73 liters, n  = 77, P  
ISSN:8750-7587
1522-1601
DOI:10.1152/jappl.1998.84.3.862