QT dispersion within the first 6 months after an acute myocardial infarction

Introduction: We analysed QT dispersion within the first 6 months postinfarction, its relationship with the main established risk stratifiers and its clinical value. Methods and results: In 55 patients with a first Q-wave myocardial infarction the 12-lead electrocardiogram was scanned and digitised for analysis of QT dispersion (QT maximum–QT minimum) at first day (72 [61–96] ms), first week (69 [47–90] ms), first month (67 [46–88] ms) and sixth month (47 [40–74] ms; P Conclusion: QT dispersion decreases progressively during the first months after myocardial infarction. These changes should be taken into account to define cut-off values of clinical interest in this phase. This variable does not seem related to the classic prognosis predictors. In a nonselected postinfarction population it has a low clinical value.