Study the characteristics of the color Dopplerechocardiography of ruptured mitral chordae tendineae (RMCT).
研究二尖瓣腱索破裂（RMCT）的彩色多普勒超声心动图特征。
2
To confirm the utility of continuous wave Dopplerechocardiography in assessing pulmonary artery wedge pressure in patients with mitral regurgitation.
目的探讨连续波多普勒超声在评估二尖瓣返流患者的肺动脉楔压中的作用。
3
Objective to analyze the accuracy of the diagnosis of aortopulmonary septal defect (APSD) by Dopplerechocardiography and improve the initial echocardiographic diagnosis.