1·Study the characteristics of the color Doppler echocardiography 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·The objective is to explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.
目的是探讨彩色多普勒静脉收缩术在评估二尖瓣反流分级中的作用。
3·Objective: To explore nursing for the patients with mitral valve replacement by chordal preservation.
前言： 目的：探讨保留瓣下结构二尖瓣置换术的护理配合。
4·In 2006, he underwent a carotid ultrasound test and transthoracic echocardiography, which showed, among other troubles, a malfunction of the mitral valve.
他于2006年进行了颈动脉超声和经胸超声心动图检查，检查结果显示，他的心脏还有其它问题，其中之一是二尖瓣功能障碍。
5·The interval between S2 and the OS is related to the severity of mitral stenosis. The more severe the stenosis, the shorter the S2-OS interval.
S2和开瓣音间隔时间跟二尖瓣狭窄程度有关，狭窄越严重，S2-OS间期就越短。