Instantaneous blood flow in the human aorta

Abstract

The computed pressure-gradient technique has been applied to the measurement of instantaneous aortic blood flow in 15 male subjects. The mean values of those curves obtained in the ascending aorta were compared with simultaneous measurements made by the dye-dilution technique. The correlation coefficient between the two methods was 0.85 and the slope of the regression line 0.80. The ability to measure flow by the pressure-gradient technique depends mainly on the accuracy of the catheter-manometer system, radius measurement, and the estimation of “zero flow.” pressure-gradient technique; methods of blood flow measurement Submitted on June 22, 1964