Catheter-Tip Flowmeter for the Measurement of Coronary Arterial Blood Flow in Intact Anesthetized Dogs

摘要

A catheter-tip flowmeter has been designed for the measurement of coronary arterial blood flow in closedchest dogs. The miniaturized flowmeter is attached to the tip of a rigid catheter, which is inserted through the right carotid artery. The flowmeter is placed in the ascending aorta where it measures the inflow into the left coronary artery. Performance tests show the reliability of the instrument for the measurement of pulsatile flow. The flowmeter has been applied to determine the pressureflow relationship of the coronary system of closed-chest anesthetized dogs. This pressure-flow relationship is obtained over the pressure range of greatest physiologic importance and describes the system for a constant set of cardiovascular conditions. (Author)