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目的 :探讨在次极量活动平板运动试验中 QTc离散度与心律失常的关系.方法 :观察 174例患者活动平板运动试验后有无心肌缺血性心律失常并测量 QTc离散度.结果 :次极量活动平板运动试验阳性者 70例 ,其 QTc离散度明显增大 ,而且 70%出现心律失常.而阴性组 Q- T离散度不增大 ,仅 2例出现房早.结论 :QTc离散度可以作为次极量活动平板运动试验预测心律失常的一个参考条件“,”Objective:To investigate the relation between QTc dispersion and arrythmia on submaxial treadmill exercise test.Methods:174 patients were investigated in which the QTc dispersion and arrythmia were determined atter submaximal treedmill test.Results:The QTc dispersion increased dramatically and there were arrythmia in 70% patients when exercise test was positive.Conclusion:QTc dispersion can be served as a paremeter for prognosticating arrythmia on submaximal tredmill exercise test Author′s address Dep.of ECG and Heart Function,No1 Hospital of Auhui Medical university,Hefei,230022