Relationship Between Tracheal Air Flow and Induced Changes in Intrathoracic Volume: A Basis for Calibration of Pneumocardiogram

The volume of air moved into the trachea due to ventricular activity-a record of which is the pneumocardiogram (PNCG)-is always less than true stroke volume. A new method of investigating this relationship consists of inducing a known volume change (ΔVin) within the thorax and measuring the volume o...

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Veröffentlicht in:	Japanese Heart Journal 1988, Vol.29(1), pp.99-106
Hauptverfasser:	WESSALE, Jerry L., BOURLAND, Joe D., GEDDES, Leslie A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Air flow Airway Resistance Animals Biological and medical sciences Calibration Cardiac output Cardiovascular system Dogs Esophagus - physiology Heart Function Tests - instrumentation Heart Function Tests - methods Investigative techniques of hemodynamics Investigative techniques, diagnostic techniques (general aspects) Medical sciences Noninvasive methods Pneumocardiogram Regression Analysis Respiration Stroke Volume Thorax - physiology Trachea - physiology
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Zusammenfassung:	The volume of air moved into the trachea due to ventricular activity-a record of which is the pneumocardiogram (PNCG)-is always less than true stroke volume. A new method of investigating this relationship consists of inducing a known volume change (ΔVin) within the thorax and measuring the volume of air (ΔVout) recorded with a pneumotachograph connected to the trachea. The range of ΔVin was from 4ml to 36ml. A linear relationship (mean r=0.98, p
ISSN:	0021-4868 1348-673X
DOI:	10.1536/ihj.29.99