EDV, ESV, and LVEF were calculated using Simpson's rule algorithm for monoplane LV angiography, using M-mode method for two-dimensional echocardiography.
左室造影采用单平面法(辛普森法则)，二维超声心动图采用M型超声获得EDV、ESV和LVEF。
2
This paper presents a new type of Electronic Servo valve (ESV) which includes the pulse width modulator, electro-mechanical actuator and variable section area valves.