Diurnal changes of heart rate and sympatho-vagal activity for temporal patterns of transient ischemia

Using all 86 records of the long-term ST database we studied diurnal variations of ischemia and heart rate among patients exhibiting different temporal patterns of ischemia: salvo, periodic and sporadic pattern. The results show, that the incidence of ischemia increases during the morning interval. The decrease of sympathetic and vagal activity during ischemia is the most prominent for the sporadic group, while for the salvo group only minor changes were observed. The results support our hypothesis, that there are at least two distinct populations which differ according to mechanisms and temporal patterns of ischemia