Relationship between tracheal air flow and induced changes in intrathoracic volume. A basis for calibration of pneumocardiogram.:A Basis for Calibration of Pneumocardiogram

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概要

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• 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<0.001) between ΔVout and ΔVin was observed in 19 anesthetized, intubated dogs: ΔVout=(f)ΔVin, where f=0.53±0.09 (mean±SD). The coeff=icient, f, ranged from 0.40 to 0.71. These results demonstrate that although f is subject-dependent, ΔVout reliably reflects changes in ΔVin. It is suggested that the technique of inducing a known volume change within the thorax and measuring the volume of air recovered from the trachea could be used as a method for calibrating the pneumocardiogram to obtain stroke volume.

• International Heart Journal刊行会の論文

著者

• WESSALE Jerry

  W. A. Hillenbrand Biomedical Engineering Center, Purdue University

• BOURLAND Joe

  W. A. Hillenbrand Biomedical Engineering Center, Purdue University

• GEDDES Leslie

  W. A. Hillenbrand Biomedical Engineering Center, Purdue University

関連論文

• Relationship between tracheal air flow and induced changes in intrathoracic volume. A basis for calibration of pneumocardiogram.:A Basis for Calibration of Pneumocardiogram

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