负荷多普勒超声心动图对机械瓣血流动力学的临床评价

Clinical Hssessment on the Hemodynamics of Mechanical heart Valve Using Exercise Doppler Echocardiography

本研究应用负荷多普勒超声心动图，检测３１例置换四种不同机械瓣术后４～１６月的体内血流动力学。结果显示：（１）四种人工心瓣在运动和休息时ＰＧｐｅａｋ、ＰＧｍｅａｎ、ＥＯＡ差异无显著性（Ｐ＞０．０５）。（２）ＢＷＶ和ＣＭ的流场均匀性优于ＧＫ和ＭＨ。（３）流场均匀性是评价体内机械瓣血流动力学的有重要意义的指标。（４）成都双叶翼型机械瓣具有当今流行机械心瓣的优良血流动力学品质。

In this study,the hemodpoamic of four different kinds of mechanical heart valve was detected in 34 patients with rheumatic heart disease from 6 to 16 months after mitral valve replacement using exercise Doppler echoardiography.The results showed that:(1)There were no significant difference among the four kinds of mechanical valve(BWV,CM,GK,and MH prostheses)in calculated effetive valve orfice area,resting and exercise peak pressure gradients or mean pressure gradients.(P>0.05)(2)The flow field distribution(FFD)of BWV and CM prostheses is better than that of GK,and MH prosteses.(3)Flow field distribution(FFD)is a useful in the assessment of the hemodynamics of mechanical prosthetic valve.