目的 应用斑点追踪技术研究高血压患者左室心肌径向应变与扭转变化规律,探讨左室扭转对心脏收缩功能的影响.方法 32例原发性3级高血压患者和35例正常人,经胸采集左室短轴二尖瓣水平、乳头肌水平和心尖水平二维图像,利用斑点追踪显像技术测算心肌径向收缩期峰值应变、心尖水平旋转角度峰值、心底水平旋转角度峰值及左室扭转角度峰值.结果 原发性3级高血压患者心肌径向峰值应变较正常组相应节段减低(P<0.05),左室旋转及扭转角峰值均较正常组增高(P<0.05).高血压组EF%及FS%值与正常组比较均无统计学差异.结论 高血压患者左室射血分数正常时,心肌收缩功能已经受损.左室扭转角度的增加在维持心脏整体收缩功能的正常起到重要的作用.%Objective To probe into the influence of left ventricular(LV)twist on cardiac systolic function by discussing systolic peak radial strain and LV rotation in essential hypertention(EH) patients using two-dimensional speckle tracking imaging(2D-STI). Methods We studied 32 patients with staging Ⅲ essential hypertention and 35 healthy control subjects. Two dimensional images were recorded from the LV short-axis view at the levels of mitral annulus,papillary muscle and apical levels. The peak systolic radial strain and rotation were measured using 2D-STI. Results In the staging Ⅲ EH,the peak systolic radial strain were lower than those in the control group(P＜0. 05). LV systolic peak rotation and twist increased in EH group(P＜0. 05). There was no significant difference for ejection fraction EF and FS among EH patients and control group. Conclusions When the EF is normal in patients with EH, the myocardial systolic function have been damaged. The increased LV twist help to LV ejection function.
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