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为探讨ＱＴｃ离散度（ＱＴｃｄ）与心肌缺血和冠状动脉（简称冠脉）病变程度的关系，分析２８例冠脉正常和５７例冠心病患者１２导联心电图的ＱＴｃｄ。结果示：冠心病组ＱＴｃｄ较冠脉正常组显著增大（４６．７±１２．６ｍｓｖｓ２６．３±１０．９ｍｓ，Ｐ＜０．０１）；不稳定型心绞痛ＱＴｃｄ明显大于稳定型心绞痛者（５４．６±１３．７ｍｓｖｓ４２．３±１４．１ｍｓ，Ｐ＜０．０５）；双支病变与单支病变以及三支病变与双支病变相比，ＱＴｃｄ均有显著增大（４８．７±１３．２ｍｓｖｓ３５．７±１１．９ｍｓ及５９．６±１５．１ｍｓｖｓ４８．７±１３．２ｍｓ，Ｐ均＜０．０５）。提示心肌缺血是引起冠心病患者ＱＴｃｄ增大的主要原因之一，ＱＴｃｄ的变化对于判断心肌缺血和冠脉病变程度有一定价值。
To investigate the relationship between QTc Dispersion (QTcd) and the degree of myocardial ischemia and coronary artery disease (CAB), the QTcd of 12-lead electrocardiogram in 28 patients with normal coronary artery and 57 patients with coronary heart disease was analyzed. The results showed that: QTcd in coronary heart disease group was significantly higher than that in normal coronary artery group (46.7 ± 12.6ms vs26.3 ± 10.9ms, P <0.01); QTcd in unstable angina was significantly higher than that in stable angina pectoris .6 ± 13.7ms vs42.3 ± 14.1ms, P <0.05). Compared with single-vessel disease and double-vessel disease, double-vessel disease showed a significant increase in QTcd (48.7 ± 13 .2msvs35.7 ± 11.9ms and 59.6 ± 15.1msvs48.7 ± 13.2ms, P <0.05). It is suggested that myocardial ischemia is one of the main causes of QTcd increase in patients with coronary heart disease. The change of QTcd has some value in judging the degree of myocardial ischemia and coronary artery disease.