Figure 3).

The incidence of ventricular fibrillation (VF) and survival from the combined ischemia-reperfusion insult in dogs subjected to repeated cardiac pacing (RP) (48 h after the initial pacing stimulus) and then subjected to coronary artery occlusion either 48 h, 72 h or 96 h after the end of the second pacing stimulus. The results show that repeated pacing prolongs the protection for at least 72 h against occlusion (filled histograms) and reperfusion-induced (open histograms) VF. *P<0.05 versus controls. SC Sham-operated controls