摘要
目的应用速度向量成像(VVI)技术分析完全性右束支传导阻滞(CRBBB)患者左心室收缩期同步性,为临床评价CRBBB患者左心室心肌力学及功能提供可靠依据。方法选择2011年3月至11月四川省医学科学院·四川省人民医院收治的CRBBB患者31例,另选取同期性别、年龄匹配的健康志愿者26名作为健康对照组。应用VVI技术获得所有受试者左心室收缩期纵向应变达峰时间(Tsl)、径向应变达峰时间(Tsr)、环向应变达峰时间(Tsc)、旋转角度达峰时间(Tra)。计算左心室18节段心内膜下收缩期纵向、径向、环向应变及旋转角度达峰时间的标准差Tsl-SD、Tsr-SD、Tsc-SD、Tra-SD作为左心室心肌纵向、径向、环向及旋转运动不同步指数。采用独立样本t检验比较健康对照组与CRBBB组Tsl-SD、Tsr-SD、Tsc-SD、Tra-SD差异。结果 CRBBB组左心室壁收缩期不同步指数Tsl-SD、Tsr-SD、Tsc-SD、Tra-SD分别为(27.65±6.78)、(32.63±11.82)、(42.81±9.72)、(37.01±7.73)ms,均高于健康对照组的(26.55±6.99)、(26.63±6.70)、(30.53±8.71)、(27.67±7.11)ms,但仅Tsc-SD、Tra-SD差异有统计学意义(t=4.911、4.980,P=0.000),Tsl-SD、Tsr-SD差异均无统计学意义。结论 CRBBB患者左心室周向及旋转运动不同步;VVI技术可反映左心室收缩期不同方向机械运动同步性。
Objective To analyze the left ventricular synchronicity in patients with complete right bundle brunch block (CRBBB) by velocity vector imaging (VVI), and to provide reliable basis for evaluating left ventricular patho-physiological function changes in patients with CRBBB. Methods The left ventricular systolic peak time of longitudinal strain (Tsl), radial strain (Tsr), circumferential strain (Tsc) and the rotation angle (Tra) were obtained by WI from 31 CRBBB patients and 26 healthy volunteers. Results The systolic dyssynchrony indexes of longitudinal (Tsl-SD), radial (Tsr-SD), circumferential (Tsc-SD), and rotational (Tra-SD) motion in 18 segment of left ventricular in CRBBB group and control group were (27.65 ±6.78) ms vs (26.55±6.99) ms, (32.63±11.82) ms vs (26.63 ± 6.70) ms, (42.81± 9.72) ms vs (30.53 ±8.71) ms, and (37.01 ±7.73) ms vs (27.67±7.11) ms, respectively. The systolic dyssynchrony indexes of circumferential and rotary motion in the CRBBB group were significantly greater than that in control group, and no significant differences were observed in longitudinal and radial dyssynchrony indexes between two groups (t=4.911, 4.980, both P=-0.000). Conclusions Compared with control group, left ventricular circumferential and rotary asynchnization index increased in CRBBB group. WI can reflect the mechanical movement synchrony of left ventricule in various dimensions.
出处
《中华医学超声杂志(电子版)》
CSCD
2015年第9期689-695,共7页
Chinese Journal of Medical Ultrasound(Electronic Edition)
基金
国家自然科学基金资助项目(No.30970699)
关键词
速度向量成像
完全性右束支传导阻滞
心室功能
左
Velocity vector imaging
Completed right bundle branch block
Ventricularfunction, left