Relationships among heart rate, patterns of ischemic change and time of day

Using 18 records of newly developed long term ST Database we studied diurnal variations of ischemia and heart rate among patients exhibiting salvo, periodic and sporadic temporal patterns of transient ischemia. The results show, that ischemia increases during the morning interval. Heart rate increase during ischemic episodes is the highest for the sporadic group. Increased sympathetic tone precedes sporadic episodes during the day and night, but not during the morning interval. The results support our hypothesis, that vasospasms are responsible for salvo pattern, and physical exertion for sporadic episodes.