速度向量成像观察双腔起搏前后右心室运动状态

目的探讨速度向量成像(VVI)技术分析双腔(DDD)起搏前后右心室心肌运动位移的变化规律,初步探讨VVI技术在评价右心室运动方面的应用价值。方法 23例DDD起搏患者术前术后均采用VVI技术检测右心室室壁各节段心肌收缩期纵向运动位移,并比较术前术后之差异。结果术前术后右心室各室壁不同节段心肌收缩峰值位移表现为从基底段到心尖段依次降低,其中基底段与心尖段的差异有统计学意义(P<0.01);与术前相比,术后后间隔、游离壁及右心室整体位移较术前显著降低,差异有统计学意义(P<0.01)。结论 DDD起搏后右心室心肌运动位移较术前明显降低;VVI可精确测量DDD起搏前后右心室心肌位移的程度,从而客观反映右心室之运动状态,进而判断右心室之功能。

Assessment of right ventricular myocardium motion in patient with DDD pacing using VVI

Objective To assess right ventricular myocardium motion in patients with dual chamber pacing（DDD） using velocity vector imaging（VVI）,and to explore the clinical application value of VVI in evaluating right ventricular motion.Methods 23 patients before and after DDD pacemaker implantation were enrolled in this study.The peak systolic displacement of right ventricular segments was measured with VVI.The difference between pre and post pacemaker implantation was analyzed.Results Right ventricular displacement before and after DDD pacing was significantly decreasing from basal,mid to apical segments（P〈0.01）.Compared with the values at the baseline,the displacement of interventricular septum,free wall and right ventricle with pacing was decreased（P〈0.01）.Conclusions Right ventricular displacement with pacing was significantly decreased compared with the values at the baseline.VVI can accurately assess right ventricular systolic displacement in patients with DDD pacing,and objectively reflect right ventricular myocardial motion and function.