二尖瓣脱垂(MVP)是常见的良性心脏缺损,也是最常见的先天畸形。由于二尖瓣叶组织过多,或腱索过长,当心脏收缩时二尖瓣前叶或后叶,部分或全部脱入左房。本病在儿童期临床表现多不明显,到成年以后听诊特点才变得明显,并出现症状。认识MVP的心音改变是困难的。作者提出了如何诊断、处理儿童无症状性二尖瓣脱垂的具体方法。二尖瓣脱垂的诊断方法根据左室造影确诊的MVP采用听诊法只能诊断出75%,而采用超声心动图检查可以诊断出80～90%,本病听诊阳性发现是收缩中期 Mitral valve prolapse (MVP) is a common benign heart defect and is also the most common congenital malformation. Due to excessive mitral leaf tissue or excessive length of the chordae, the anterior or posterior leaflet of the mitral valve is partially or completely removed into the left atrium when the heart contracts. The clinical manifestations of this disease in childhood are not obvious, to adult characteristics after hearing auscultation became obvious and symptoms. Recognizing the changes in heart sounds of MVP is difficult. The authors present how to diagnose and treat children with asymptomatic mitral valve prolapse specific methods. Diagnosis of mitral valve prolapse according to MVP diagnosed by left ventricular angiography can only be diagnosed by auscultation of 75%, while the use of echocardiography can be diagnosed 80 ~ 90%, the disease auscultatory positive findings are contracting mid-term