PMID: 1185931Jun 1, 1975Paper

[Method of continuous monitoring of stroke and minute cardiac volume by the aortic pressure curve].

Kardiologiia
N G Serdiuk, O S Antonov

Abstract

A new method of determining the cardiac output and stroke volume on the basis of the aortic pressure curve by way of a direct pressure-volume calibration is suggested. For this purpose two catheters are introduced into the ascending aorta, and via one of them saline is supplied with a constant volume rate (delta V). At the same time the augmentation of the diastolic pressure in the aorta (delta P) caused by the administration of the saline is recorded by means of the second catheter which tip is located some 3--4 cm below the first one along the blood flow. The mean pulse pressure in the aorta (Pp) also corresponds to a definite flow in the aorta (V). The relationship between the volume and pressure in the aorta within the physiological range is a lineal function. Hence, V = Pp-delta V divided by delta P cm3/sec. By multiplying this value times the duration of the cardiac cycle in seconds, the stroke volume is obtained. By dividing the volume of the administered saline (delta V.t) into the pressure augmentation area (delta S), the volume corresponding to each unit of the pressure area is found. Then by multiplying this calibration value times the area under the pressure curve in any cardiac cycle (S) again the stroke volume is ...Continue Reading

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