超声心动图观察室间隔运动新方法研究

目的 利用室间隔运动时曲率半径的变化,观察正常人呼吸性胸压变化对室间隔摆动和形变的影响,评价新方法 观察室间隔运动的敏感性.方法 应用Acuson Sequoia 512型超声仪对21例健康志愿者进行检查.分别获取呼气相和吸气相左室腱索短轴观图像;同步记录各瓣口血流速率、心电图和呼吸曲线.两名医师在双盲条件下采用自制的测量软件.分别测量吸气相与呼气相室间隔曲率半径.结果 二尖瓣E峰血流速率和主动脉血流速率在呼气相均高于吸气相;三尖瓣E峰血流速率和肺动脉瓣血流速率则相反.吸气相室间隔曲率半径为(25.14±6.082)mm.呼气相室间隔曲率半径为(22.296±4.398)mm,二者差异有统计学意义(P<0.0001).结论 曲率半径可以评估室壁摆动和形变,具有良好的重复性,为临床评价呼吸性胸压变化提供一种敏感而可靠的新方法 .

A new way to study the motion of interventricular septum by echocardiography

Objective To evaluate the effect of normal respiration on motion and disfiguration of interventricular septum (IVS) by observing the change of interventricular septum radius of curvature (IVSRC). Methods The 2D short-axis images at chordae tendineae of mitral valve were recorded during inspiration and expiration respectively by Acuson Sequoia 512 in 21 normal subjects. Speed of blood flow of each valve, electrocardiogram and respiratory tracing were recorded simultaneously. Two doctors who were double-blind measured the IVSRC using self-designed software. Results During normal inspiration, the peak E velocity of mitral valve and the flow velocity of aortic valve decreased,while the peak E velocity of tricuspid valve and the flow velocity of pulmonary valve increased. The IVSRC curvatures were (25.914± 6.082)mm during inspiration, and (22.296±4.398)mm during expiration, there was difference in two respiration phases(P <0.0001). Conclusions IVSRC can be used to evaluate motion and disfiguration of IVS. It has a good repeatability and is an effective way to observe the change of pleural pressure which is produced by respiration.