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①目的 探讨急性心肌梗死病人ＱＴ离散度变化及其与预后的关系。②方法 在发病２４ｈ 内、第７，１４ 天分别对４４ 例病人行１２ 导联心电图检查，必要时加做右胸及Ｖ７～９ 导联，按心率校正公式计算ＱＴ离散度（ＱＴｃｄ）。③结果 与２４ｈ 内相比较，第７，１４ 天ＱＴｃｄ 值明显降低，差异有极显著性（Ｆ＝ ２６．４２，ｑ＝ ８．０６，９．３５，Ｐ＜０．０１），第１４ 天与第７天相比较，差异无显著性（ｑ＝ １．３６，Ｐ＞ ０．０５）。非死亡组ＱＴｃｄ 值明显低于死亡组，差异有显著性（ｔ＝ ３．０２，Ｐ＜ ０．０１）。④结论 急性心肌梗死发病早期ＱＴｃｄ 值明显增大，随着病情好转，ＱＴｃｄ 值逐渐下降和稳定。ＱＴｃｄ 可作为急性心肌梗死病人近期预后的重要参考指标之一。
Objective To investigate the changes of QT dispersion in patients with acute myocardial infarction and its relationship with prognosis. Methods On the 7th and 14th days of onset, all the 44 patients were examined with 12-lead electrocardiogram. When necessary, the right chest and V7-9 lead were added. The QT dispersion was calculated according to the heart rate correction formula. Results Compared with 24h, QTcd value decreased obviously on the 7th and 14th days (F = 26.42, q = 8.06,9.35, P <0.01). On the 14th day Compared with the 7th day, there was no significant difference (q = 1.36, P> 0.05). The QTcd value of non-death group was significantly lower than that of death group (t = 3.02, P <0.01). ④ Conclusion The incidence of acute myocardial infarction QTcd value increased significantly, with the condition improved, QTcd value decreased and stabilized. QTcd can be used as an important prognostic reference for acute myocardial infarction patients.