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本文利用彩色多普勒血流显像（ＣＤＦＩ）技术，分析了１０１例不同病因的二尖瓣返流（包括扩心病、二尖瓣脱垂、冠心病、风心病及生理性返流）的返流形态特征。在心尖四腔切面，扩心病的返流特征为起始于瓣膜闭合点的“卵圆形”返流束。二尖瓣脱垂其基本血流形态为“偏心水滴样”返流。当前瓣脱垂时，返流束偏向左房内侧壁；后瓣返流时，返流束偏向左房外侧壁。有节段性室壁运动异常而合并返流的冠心病的返流束方向与受累室壁有关，前外侧室壁运动异常合并返流，新月状返流束多位于左房内侧壁；后间壁室壁运动异常伴返流时，新月状返流束多位于前瓣后缘即左房外侧壁。风心病导致的返流，由于二尖瓣装置多部位受累，其形成的血流形态多无一定的特征性变化。生理性返流是不同于上述四种病理性返流的另一类返流。ＣＤＦＩ主要表现为二尖瓣闭合点后方、瓣环附近椭圆形返流束。其返流束面积、长度、最大返流速度以及返流时间与收缩时间比值均显著低于病理性返流。本文结果表明：利用ＣＤＦＩ提供的不同病因返流形态特征及返流参数，结合二维超声心动图的形态学信息，可以为临床病因诊断及治疗提供有益的依据。
In this study, color Doppler flow imaging (CDFI) was used in 101 cases of mitral regurgitation (including dilatation, mitral valve prolapse, coronary heart disease, rheumatic heart disease and physiological reflux) Regurgitant morphological characteristics. In the apical four-chamber view, the characteristic of the regurgitation of dilated heart disease is the “oval” regurgitant beam beginning at the valve closure point. Mitral valve prolapse of its basic blood flow morphology as “eccentric water droplets like” reflux. When the current flap prolapse, the reflux beam is biased towards the left atrial wall; when the posterior valve regurgitation, the return beam is biased towards the lateral wall of the left atrium. Coronary artery disease with segmental wall abnormalities combined with regurgitation of the retrograde beam direction and involved the wall, anomalous anterior chamber wall motion merger regurgitation, crescent shaped retrograde flow in the left atrial wall; Room wall wall motion abnormalities with reflux, the crescent-shaped retrograde flow in the trailing edge of the anterior lobe of the left atrial wall. Rheumatic heart disease caused by reflux, due to multiple parts of the mitral valve involvement, the formation of blood flow morphology and more no specific changes. Physiological regurgitation is another type of regurgitation that is different from the above four pathological regurgitances. CDFI mainly for mitral valve closure point behind the oval-shaped regurgitant beam near the annulus. The reflux area, length, maximum regurgitation velocity and the ratio of reflux time to contraction time were significantly lower than the pathological reflux. The results of this paper indicate that the morphological characteristics of different etiologies and regurgitation parameters provided by CDFI and the morphological information of two-dimensional echocardiography can provide useful evidences for the diagnosis and treatment of clinical etiology.