A RAPID PLETHYSMOGRAPHIC METHOD FOR MEASURING THORACIC GAS VOLUME: A COMPARISON WITH A NITROGEN WASHOUT METHOD FOR MEASURING FUNCTIONAL RESIDUAL CAPACITY IN NORMAL SUBJECTS 1

Journal/Book: Reprinted from THE JOURNAL OF CLINICAL INVESTIGATION Vol. XXXV No. 3 pp. 322-326 1956. 1956;

Abstract: (From the Department of Physiology and Pharmacology Graduate School of Medicine University of Pennsylvania Philadelphia Pa.) 1 This investigation was supported in part by a research grant H-406 from the National Heart Institute of the National Institutes of Health U. S. Public Health Service. CONCLUSIONS A new plethysmographic method for measuring thoracic gas volume is described. It is rapid safe uninfluenced by the usual quantities of abdominal gas requires no gas samples for chemical analysis and has been found to give reproducible and accurate values which in normal individuals are essentially the same as those measured by the open circuit method of Darling Cournand and Richards (1). A major advantage of the new technique is that it measures the total volume of compressible gas in the thorax whether in communication with the airway or not and therefore should provide the basis for the quantitative measurement of non-ventilated gas. . . .

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