一种评价二尖瓣偏心返流严重程度的修正PISA算法

基于彩色多普勒成像的近测等速面(PISA)算法是临床评价二尖瓣中心返流严重程度的一种常用方法，但对于偏心返流却存在极大低估。针对这一现状，从返流角度和湍流强度两个方面，对传统PISA算法的有效返流瓣口面积(EROA)进行修正。为比较首先用传统PISA算法的EROA对具有不同程度偏心返流的20例患者进行分级，结果误差较大；用改进PISA算法的EROA分级效果良好。对比实时三维超声测得的数据表明修改后的PISA算法相关性更好。

Evaluation of Eccentric Mitral Regurgitation Using a Modified PISA Algorithm

The PISA(Proximal Isovelocity Surface Area) method based on the foundation of the Doppler color proximal flow convergence,has been accepted by clinic to assess the severity of the central MR(mitral regurgitation).However,the result tend to be greatly underestimated when the PISA is applied to eccentric MR.In order to estimate eccentric MR,two parameters named turbulent intensity and regurgitate angle were proposed to modify the effective regurgitate orifice area(EROA) based on traditional PISA algorithm.23 patients with various severity of eccentric MR were studied to compare modified PISA algorithm with the traditional one.The results showed the grading results of eccentric MR evaluated by the modified PISA algorithm were more rational and accurate,compared with the results obtained from live-3D color Doppler flow imaging method.