实时三维超声心动图测量二尖瓣环准确性研究

A study on measurement accuracy of mitral annulus by real-time three-dimensional echocardiography

目的:探讨应用实时三维超声心动图测量二尖瓣环立体空间结构的准确性。方法:采用实时三维超声心动图对10只犬活体心脏进行实时三维成像,并应用TomTec公司的三维分析软件加以分析。测量:①二尖瓣环于前外侧连合与后内侧连合间连线距离;②二尖瓣环于前外侧连合与后内侧连合连线中点的垂直直线距离;③二尖瓣环于前外侧连合、后内侧连合间连线与前叶侧瓣环、后叶侧瓣环顶点间连线之间的距离;④二尖瓣环面积。另通过该犬处死后离体心脏标本测量,验证实时三维超声心动图测量的准确性。结果:实时三维超声心动图测量二尖瓣环的各项测值与实际解剖标本之间高度一致,并且高度相关,相关系数分别为0.885,0.808,0.834,0.796(P<0.05)。结论:实时三维超声心动图可以准确反映二尖瓣环的立体空间结构。

Objective: To validate the accuracy of real-time three-dimensional echocardiography(RT-3DE) in measuring mitral annulus. Methods: Ten dogs' vivo hearts were imaged by RT-3DE. The mitral annulus were annotated and measured by TomTec 4D Cardio-View analysis software. The distance between two commissures of mitral annulus, middle perpendicular distance, distance between line from anterolateral commissure to posteromedial commissure of the mitral annulus and line from the top of anterior mitral annulus to the top of posterior mitral annulus and mitral annulus area were measured. Parameters derived by RT-3DE were compared with vitro heart measurements. Results: Parameters derived by RT-3DE were highly identical with the anatomic view. There were good correlation between RT-3DE measurements and anatomic view. The correlation coefficents were 0.885, 0.808, 0.834, 0.796 respectively(P<0.05). Conclusion: For solid geometry of mitral annulus, RT-3DE can measure it accurately.