Objective To evaluate whether the addition of carvedilol to conventional therapy in dilated cardiomyopathy (DCM) patients was associated with further benefits in shortening QT intervals dispersions(QTd) and reducing ventricular arrhythmias (VA).

• 目的 :探讨卡维地洛治疗对扩张型心肌病 (DCM )患者心电图QT间期离散度 (QTd)及室性心律失常的影响。