长期运动诱导的心肌肥厚对QT离散度的影响

目的对长期运动左心室重量增加个体的QT离散度(QTd)进行分析。方法各入选26例长期运动个体和运动较少的正常个体,经二维超声心动图测量心室结构参数,记录同步12导联心电图测量QT离散度。结果长期运动的个体左心室重量明显大于运动少的个体(216±39kg对155±30kg;P<0.01);长期运动个体校正的QT离散度(QTcd)比运动少的个体明显减少(42±13ms对51±15ms,p<0.01)。左心室重量(LVM)与QT离散度和QTcd呈明显的负相关(r=-0.38,p=0.002和r=0.53,p=0.001)。结论运动诱导的心肌肥厚使QT离散度减小,反映了长期运动个体心肌复极化的稳定性。

The effects of exercise-induced cardiac hypertrophy on QT dispersion

Objective To evaluate the QT dispersion in subjects with left ventricular hypertrophy induced by exercise. Methods 26 long term trained subjects and 26 less trained subjects were enrolled in the study, LV mass were measured by 2-dimensional echocardiography QT dispersion were measured by 12-lead resting electrocardiogram. Results Long term trained, subjects had greater LV mass than less trained subjects (P<0.01), QTcd was significantly lower than controls. LV mass was inversely correlated with QTd (r=-0.38;P=0.002) and QTcd (r=0.53,P=0.001). Conclusion QTd was decreased in exercise-induced cardiac hypertrophy subjects, which may reflect homogeneous myocardial repolarization in long term trained subjects.