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分析不同受试者的Ｑ－Ｔｃ及Ｊ－Ｔｃ间期的变化，并进行比较，发现陈旧性心肌梗塞（ＯＭＩ）组的Ｑ－Ｔｃ及Ｊ－Ｔｃ间期均与正常组接近；单纯的完全性右束支传导阻滞（ＣＲＢＢＢ）组和ＯＭＩ＋ＣＲＢＢＢ组仅表现Ｑ－Ｔｃ间期延长，Ｊ－Ｔｃ间期与正常组接近；急性心肌梗塞（ＡＭＩ）组和ＡＭＩ＋ＣＲＢＢＢ组Ｑ－Ｔｃ及Ｊ－Ｔｃ间期均明显长于正常组。结果提示：Ｊ－Ｔｃ间期较Ｑ－Ｔｃ间期能更好地反映心室肌复极状态，对心室除极顺序正常和异常均适用，并认为Ｊ－Ｔｃ间期是判断ＡＭＩ演变期一项可敏感而又可靠的诊断指标。
The changes of Q-Tc and J-Tc in different subjects were analyzed and compared. The Q-Tc and J-Tc intervals in old myocardial infarction (OMI) group were all close to those in normal group. Pure and complete The Q-Tc interval and J-Tc interval were similar between the CRBBB group and the OMI + CRBBB group. The Q-Tc and J-Tc in the acute myocardial infarction (AMI) and AMI + Interphase were significantly longer than the normal group. The results suggest that J-Tc interval can better reflect ventricular repolarization status than Q-Tc interval, and is suitable for the normal and abnormal ventricular depolarization sequence. It is considered that J-Tc interval is an indicator of the evolution of AMI Sensitive and reliable diagnostic indicators.