Exercise Induced Changes of ST Depression and Its Correlation with QT Dispersion in Myocardial Infarction Patients

Abstract

The aim of this study was to assess the correlation between exercise induced changes of ST segment depression and QT dispersion in myocardial infarction patients and to evaluate the prognostic capability of these signs . We prospectively assessed exercise induced ST depression and QT dispersion from the early exercise test electrocardiograms at rest, peak of exercise and 3 min after exercise (at recovery) in 53 myocardial infarction patients dying within 10 years after infarction. Among patients dying suddenly within the first 6 months after myocardial infarction, exercise induced QTc prolongation (>440 ms) and ST changes (10 cases of depression and 1 case of elevation) at the early exercise test were found in all of them. The exercise induced ST depression >2.5 times increased probability of QT dispersion p-0.024). The QT dispersion into recovery was significantly associated with exercise induced ST depression (p-0.014). Ill. 4, bibl. 11 (in English; summaries in Lithuanian, English and Russian).