Fig. 1

Androgenic hormones activities regulate arrhythmogenicity. a Representative action potentials (AP) recorded after applying the arrhythmic pacing protocol (APP; 10 Hz for 10 s, 20 Hz for 10 s and 1 min at 0.5 Hz) to isolated and perfused right ventricles excised from rats of each group (n = 5 rats per group). b Bar graph showing the percentage of positive APP for each group. Numbers inside bars Number of positive APPs/total APPs. Asterisk Significantly different from control at p < 0.05 by cumulative binomial probabilities. VEAP Ventricular extrasystolic action potential. For a description of the groups, see "Drug administration"