对２９例经皮球囊二尖瓣扩张术病人，术前用彩色多普勒超声心动图测定二尖瓣的瓣膜厚度，并与术后疗效的关系进行定量研究。结果显示，二尖瓣前叶厚度小于５ｍｍ组术后瓣口面积明显大于５ｍｍ以上组（Ｐ＜０．０１），前者极显效及显效率为９３．３％，较后者４２．８％有显著差异性（Ｐ＜０．０１），从而为开展该项技术提供定量的指标。 In 29 patients with percutaneous balloon mitral valve dilatation, mitral valve thickness was measured preoperatively by color Doppler echocardiography, and the relationship between postoperative effects was quantitatively studied. The results showed that the mitral valve anterior mitral thickness less than 5mm group was significantly larger than the group after 5 mm orifice area (P <0.01), the former was markedly effective and markedly effective rate was 93.3%, 42.8% compared with the latter Significant difference (P <0.01), so as to provide quantitative indicators for the development of the technology.