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目的运用速度向量成像技术(VVI)和自动左室容积分析(LVA)探索频发室性早搏(PVCs)对左室心肌功能的影响。方法 20例单纯性频发PVCs患者和经年龄与性别匹配的40例正常志愿者进行常规超声检查后,留存所需图像并运用VVI和LVA进行后处理,记录左室心肌短轴三个切面的整体径向收缩期峰值应变(S)、收缩后指数(PSI)、最大室壁延迟时间(MWD)、应变达峰时间的标准差(SD)以及容积参数左室射血分数(LVEF)、每搏量(SV),并进行统计分析。结果相比于正常组,异常组仅在基底段S减低、PSI增大(P<0.05),并且异常组间差异均无统计学意义。左室短轴三个切面异常组(室性心搏)MWD和SD与其他两组比较均增大(P<0.05);而异常组(窦性心搏)与正常组间差异均无统计学意义。异常组(室性心搏)LVEF和SV较其他两组均减低(P<0.05);而异常组(窦性心搏)和正常组间差异均无统计学意义。结论 VVI和LVA在PVCs中均具有一定临床价值。VVI能够早期发现心肌隐匿性损伤及心室同步性异常,而LVA能够解释心肌功能受损的原因。
Objective To explore the effect of frequent ventricular premature beat (PVCs) on left ventricular myocardial function using velocity vector imaging (VVI) and automatic left ventricular volume analysis (LVA). Methods Twenty patients with simple frequent PVCs and 40 normal volunteers matched by age and sex were subjected to routine ultrasound examination. The required images were preserved and processed by VVI and LVA. The three axial sections of the left ventricular myocardium were recorded The values of global radial systolic peak strain (S), systolic index (PSI), maximum wall delay time (MWD), standard deviation of peak strain time (SD) and volume parameter LVEF Stroke volume (SV), and statistical analysis. Results Compared with the normal group, the abnormal group decreased only in the basal segment S, PSI increased (P <0.05), and there was no significant difference between the abnormal group. The MWD and SD of the three axial abnormalities group (ventricular asystole) were significantly higher than those of the other two groups (P <0.05), but there was no significant difference between the abnormal group (sinus rhythm) and the normal group. LVEF and SV in abnormal group (ventricular heartbeat) were significantly lower than those in other two groups (P <0.05), but there was no significant difference between abnormal group (sinus heartbeat) and normal group. Conclusion VVI and LVA have certain clinical value in PVCs. VVI early detection of myocardial occult damage and abnormal ventricular synchronization, and LVA can explain the causes of impaired myocardial function.