患儿女,生后201d,体检时发现心脏杂音就诊。查体:双肺无显变,心前区可闻及较响亮的全收缩期杂音。彩色多普勒超声心动图检查:左房内径20mm,左室舒张末期内径27mm,左室收缩末期内径15mm,右房、右室大小正常,左心室射血分数:60%,二尖瓣增厚,前瓣收缩期脱向左房侧,超过瓣环水平,前后瓣对合不良,二尖瓣前瓣瓣环处可见一强回声带,后乳突肌发育不良(图1),后瓣腱索回声增强,后瓣短、活动度差。CDFI:二尖瓣中-重 Children with children, after birth 201d, physical examination found heart murmur treatment. Physical examination: lungs no change, precordial area can be heard and more loud systolic murmur. Color Doppler echocardiography: left atrial diameter 20mm, left ventricular end-diastolic diameter 27mm, left ventricular end-systolic diameter 15mm, right atrium, right ventricular size was normal, left ventricular ejection fraction: 60%, mitral valve thickening , The anterior systole left off to the left atrium, beyond the level of the annulus, anteroposterior and malalignment, a strong echogenic zone at the anterior mitral valve annulus, posterior mastoid dysplasia (Figure 1), posterior flap tendon Cable echo enhanced, short valve, poor activity. CDFI: Mitral valve - heavy