Ventricular arrhythmias induced by dynamic and static exercise in relation to coronary artery bypass grafting.
The effect of coronary artery bypass grafting (CABG) on exercise-induced ventricular arrhythmias was examined in 53 patients. A bicycle exercise test and an isometric handgrip exercise test were performed before and 3 months after CABG. Exercise-induced ventricular arrhythmias were detected preoperatively in 14 patients (26%), in 13 during the bicycle test and in 11 during the handgrip test, and in 18 patients (34%) after CABG. Thus, CABG had no significant effect on the occurrence of exercise-induced ventricular arrhythmias. Nine patients had new exercise-induced ventricular arrhythmias after CABG, 8 of whom had evidence of previous myocardial infarction, whereas only 8 of the 35 patients (23%) without postoperative ventricular arrhythmias had had a previous infarction. The rate of graft patency or improvement in exercise tolerance in patients with new postoperative arrhythmias did not differ from that in patients who did not have exercise-induced arrhythmias after CABG. The results confirm that CABG has no influence on the occurrence of ventricular arrhythmias induced by physical exercise. Patients with a previous myocardial infarction appear to be prone to new ventricular arrhythmias despite successful revascularization.
D000328:Adult; D001145:Arrhythmias, Cardiac / Q000209:etiology* / Q000503:physiopathology; D001026:Coronary Artery Bypass / Q000009:adverse effects*; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D005080:Exercise Test; D005260:Female; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography