Degenerative mitral valve (MV) disease is the major cause of mitral regurgitation (MR) [(1)][1]. Transthoracic echocardiography (TTE) is accurate in the diagnosis and localization of MV prolapse [(1)][1]. Although TTE localization of prolapse at the 6 segments of leaflets is well established [(2)][

中文翻译：

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经胸腔超声心动图发现二尖瓣反流由合体脱垂引起

二尖瓣退行性变（MV）疾病是二尖瓣反流（MR）的主要原因[[1]] [1]。经胸超声心动图（TTE）在MV脱垂的诊断和定位中是准确的[[1]] [1]。尽管已经确定了小叶的6个部分的脱垂的TTE定位[[2]] [