据知二脱形态学有重要的预后意义,但是二脱患者和健康者在体内的形态和活动尚未充分研究。二脱的诊断标准;M型心超显示 二尖瓣叶在收缩中晚期向后突出,超过开放点和关闭点之间连线≥2mm;二维心超胸骨旁长轴显示二尖瓣在收缩期突入左房。收缩晚期二尖瓣叶向后运动但未突入左房,是二尖瓣环扩大所致。100例二脱患者和100例以年龄、性别配列的健康者为对象。测定:二尖 It is known that douban morphology has an important prognostic significance, but the morphology and activity of bidet and healthy subjects in vivo have not yet been fully studied. Two off the diagnostic criteria; M-type supercardiac mitral valve leaflets in the mid-late contractions prominent, more than open and the connection point between the closure point ≥ 2mm; two-dimensional heart superpulmonary paraspinal axis shows the mitral valve in the contraction Period broke into the left atrium. Late mitral valve contraction contralateral contraction but not into the left atrium, is due to the expansion of the mitral valve annulus. 100 cases of two off patients and 100 cases of age and sex with the health of those who were enrolled. Determination: two sharp