Zhang Y
Affiliated Hospital, Shandong Medical University, Jinan.
Zhonghua Xin Xue Guan Bing Za Zhi. 1990 Aug;18(4):207-9, 253.
To evaluate the accuracy of the pressure half-time (PHT) method in predicting the anatomical mitral valve area (Aa) in mitral stenosis, Doppler echocardiography was performed in 42 cases with mitral stenosis within 48 hours before mitral valve replacement. The diastolic mitral flow velocities were recorded by the continuous wave Doppler technique, and PHT and the derived mitral valve area (Ad) were measured by a computer system from the Doppler spectrum. Aa was measured from a photograph of the mitral valve excited en bloc at surgery. The comparison between Aa and Ad yielded a good correlation (r = 0.85). However, Ad significantly underestimated Aa (P less than 0.001) in cases with combined mitral stenosis and regurgitation, and significantly overestimated Aa in cases with combined mitral and aortic lesions. There was also a large scatter of data obtained by the two measurements (SEE = 0.41 cm2). It is concluded that the PHT method can predict Aa in isolated mitral stenosis with an acceptable accuracy but is of only limited value in combined mitral stenosis and regurgitation or combined mitral and aortic valve lesions.
为评估压力减半时间（PHT）法预测二尖瓣狭窄时解剖学二尖瓣面积（Aa）的准确性，在二尖瓣置换术前48小时内对42例二尖瓣狭窄患者进行了多普勒超声心动图检查。采用连续波多普勒技术记录舒张期二尖瓣血流速度，通过计算机系统从多普勒频谱测量PHT及推导得出的二尖瓣面积（Ad）。从手术中整体激发的二尖瓣照片测量Aa。Aa与Ad之间的比较显示出良好的相关性（r = 0.85）。然而，在合并二尖瓣狭窄和反流的病例中，Ad显著低估了Aa（P < 0.001），而在合并二尖瓣和主动脉病变的病例中，Ad显著高估了Aa。两种测量方法获得的数据也存在较大离散度（标准估计误差 = 0.41 cm²）。结论是，PHT法可在单纯二尖瓣狭窄中以可接受的准确性预测Aa，但在合并二尖瓣狭窄和反流或合并二尖瓣与主动脉瓣病变时价值有限。
