Author observed Q-Tc dispersion (Q-Tcd) shown in 12-lead ECG of 100 normal individuals, 50 cases of coronary artery disease (CAD) and 50 cases of hypertensive heart disease (HHD) in order to correctly assess clinical value of Q-Tcd.

• 为评价Q-T_c离散度(Q-T_(cd))的临床意义；观察100例正常人；50例冠心病和50例高血压心脏病患者12导联ECG的Q-T_(cd)。 发现正常组男、女之间Q-T_c有显著性差异(P<0.；001)；平均女比男长18ms;