超声斑点追踪成像评价心功能不全患者收缩期心肌扭转的初步研究

目的 应用超声斑点追踪成像技术评价心功能不全患者收缩期左室心肌旋转及扭转运动变化.方法 32例正常对照者和24例心功能不全患者,显示左室标准短轴观图像,分别测量并比较两组患者各短轴观图像在标化时间点处的左室旋转及扭转角度、收缩期左室旋转及扭转峰值与相应达峰时间,观察左室旋转值及扭转值随时间变化的关系.结果 心功能不全患者左室各短轴观收缩期左室旋转及扭转峰值均显著低于对照组(P<0.05);与对照组比较,心功能不全组左室扭转达峰时间明显延长(P<0.05),达峰点出现在舒张期,左室心尖水平顺时针旋转达峰时间长于对照组(P<0.05),延长至射血期.结论 心功能不全患者左室扭转运动减低,左室心底、心尖相对旋转不同步,旋转角度减低.

Evaluation of left ventricular torsion in patients with cardiac dysfunction using ultrasound speckle tracking imaging

Objective To investigate the performance of left ventricular torsion (LVtor) or twist with cardiac dysfunction patients by speckle tracking imaging (STI). Methods Standard left ventricular short-axis views images were acquired by rountine two-dimensional echocardiography in thirty-two healthy humans and twenty-four patients with cardiac dysfunction. LVtor angle,left ventricular rotation (LVrot) angle,the peak value and time of LVtor and LVrot were measured respectively. The data were compared and analyzed between the two groups. Results Compared with normal group,the peak of LVtor and LVrot angle was decreased in cardiac dysfunction group at both apical and basal planes (P<0.05). The peak time of LVtor in patients with cardiac dysfunction was delayed (P<0.05). The peak time of clockwise rotation at the apical level segments was longer than control group (P<0.05). Conclusions There is a temporal sequence difference of left ventricular rotation between basal and apical planes during left ventricular contraction and decreased LVtor has been demonstrated to influence left ventricular function.