全方向M型超声评价右心室流出道起源室性期前收缩患者左心室运动同步性

目的 探讨全方向M型超声心动图评价右心室流出道（RVOT）起源室性期前收缩（PVB）患者左心室心肌径向运动同步性的临床价值。方法 对30例右心室流出道起源PVB患者（PVB组）和30例健康志愿者（对照组），应用全方向M型超声系统测量左心室短轴乳头肌水平6个节段收缩期速度达峰时间(Ts)及舒张早期速度达峰时间(Td)，计算6个节段的标准时间差(Ts-6-SD, Td-6-SD)，以评价PVB对左心室运动同步性的影响。结果 在所有节段中, PVB组正常窦性心律时Ts、Td与对照组比较，差异无统计学意义(P＞0.05)，而Ts-6-SD、Td-6-SD均大于对照组(P＜0.05), PVB组PVB时的Ts、Td、Ts-6-SD、Td-6-SD均大于正常窦性心律时(P＜0.01）。结论 右心室流出道起源PVB患者在窦性心律及PVB时左心室收缩与舒张均存在失同步，全方向M型超声能够为评价左心室心肌径向运动同步性提供一定的参考价值。

Evaluation of left ventricular synchronicity in patients with premature ventricular beats from right ventricular outflow tract by omni-directional M-mode echocardiography

Objective To evaluate the left ventricular radial synchronicity in patients with premature ventricular beats (PVB) from right ventricular outflow tract (RVOT) with omni-directional M-mode echocardiography (OME). Methods Two groups were involved in this study including PVB group (n=30,patients with PVB from RVOT) and control group (n=30 healthy subjects). The time to peak myocardial systolic velocities (Ts) and the time to peak myocardial early-diastolic velocities (Td) were obtained from the velocity-time c...