THE CONSTRUCTION OF A THEORETICAL CARDIAC EJECTION CURVE FROM THE CONTOUR OF THE AORTIC PRESSURE PULSE

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Abstract
The distensibility of the parts of the dog and human aortas were determined by stretching at a constant rate of tension increase. Volume-pressure relations were then derived from these measures. On the basis of selected typical pressure pulse contours, the vol.-pressure relations, and the pulse wave transmission times, a theoretical aortic uptake curve was calculated. By adding vols. of drainage, the derived curve should equal the cardiac ejection curve. The conformation of the dog curve is quite similar to the published direct cardiometer curves. These derived curves show that the course of the ejection curve will vary not only with the pulse pressure, but with the duration of systole, the diastolic pressure, the rate of peripheral drainage, and the length of the arterial tree. Ejection curves are therefore as variable as are pressure pulse contours.

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