Blood Flow in the Aortic Wall

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Abstract
The indicator-fractionation technic for measurement of regional blood flow has been applied to the measurement of blood flow in the aortic wall, using Rb86. The aortic-indicator content declines slowly with time during the first minute, which shows that the aorta has a smaller extraction ratio for Rb86 than the rest of the body. The application of the indicator-fractionation technic when organ content of indicator changes with time is discussed. It is shown that the perfusion rate of rat aorta is at least 1.70 ml./Gm./min. This value is much larger than would be expected from in vitro studies of aortic oxygen utilization.

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