VARIATIONS IN FILLING AND OUTPUT OF THE VENTRICLES WITH THE PHASES OF RESPIRATION

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Abstract
The authors recorded ventricular vol. in anesthetized dogs by means of a cardiometer, the chest being closed so that natural breathing could go on. The recording system described allows external pressure on the ventricles to vary with respiration in the normal manner. Ventricular vol. rises with inspiration and falls with expiration, the change varying in degree according to the depth of inspiration. In general inspiration also augments stroke output, but this effect lags slightly in time. Hence the minimal stroke output may appear early in inspiration, and the maximum with the first systole following the onset of expiration.

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