New methods for noninvasively detecting pulmonary pressure and left ventricular end - diastolic pressure manometer that measures megative pressure in mmhg was connected with the examined subject through a mask . the manometer is a remodeled sphygmomanometer for routine peripheral arterial blood pressure measurement that is market - available . the examined subjects were asked to carry out muller maneuver slowly so that the intrathoracic pressure decreases gradually while the blood flow of the right ventricular outflow tract observed with pulsed doppler echocardiography at the parasternal short - axis view of the great vessels in the two - dimensional echocardiography 肺动脉压和左室舒张末压无创测定新方法随机选取有肺动脉瓣返流受检者，根据我们提出的假说，人为地降低胸内压（附加胸腔负压） ，当降到肺动脉内压力等于或小于右室压时，肺动脉瓣即可开放，用多普勒超声心动图法可以探查到肺动脉瓣上的前向血流，此时的肺动脉压应该为附加胸腔负压的绝对值加上右室压。
