多普勒超声心动图法是心脏超声诊断中一种前途广阔的发展中领域,可用于测量血流速度,对心瓣膜狭窄、返流及心内分流、以及心排出量的非侵入性定量具有临床价值。现今技术进步,已有多普勒与两维超声心动图的一体化商品装置,及供床旁作心排出量测定的小型、便携式仪器。多普勒测心排出量的原理为:如能测出管道内平均流速和管道的横断面积,则可算出经过管道的净血流量。从主动脉内流速计算搏出量,需要一个心动周期内流经升主动脉横断面积瞬时血流速度的 Doppler echocardiography is a promising area of ​​development for echocardiographic diagnosis that can be used to measure blood flow velocity, noninvasive quantification of cardiac valve stenosis, regurgitation and intracardiac shunting, and cardiac output with Clinical Value. Today’s technological advances include the integration of Doppler and two-dimensional echocardiography, and small, portable instruments for determination of cardiac output at the bedside. The principle of Doppler cardiac output is as follows: If the average velocity of the pipeline and the cross-sectional area of ​​the pipeline can be measured, the net blood flow through the pipeline can be calculated. Calculating the stroke volume from the velocity in the aorta requires an instantaneous blood flow through the ascending aorta in a cardiac cycle