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Figure 1 (a) Representative trace of sustained ventricular tachycardia (SVT) on electrocardiograms from the beta group of rabbits. Wide QRS tachycardia (maximum 13 beats) was seen. (b) Summary of the ventricular arrhythmias observed on the electrocardiogram. The prevalence of SVT was significantly higher in the beta group than in the control group. C = control; NS = normal sinus rhythm; NSVT = non-sustained ventricular tachycardia; VPC = ventricular premature contractions.