A. Dot blots of differences in arrhythmia incidences (PVC, bigeminy, couplets, triplets, non-sustained VT (nsVT), all presented as beats/two hours; sustained VT (susVT), duration in seconds). Each dot represents a 2-hour interval of an individual rabbit (n=14 in EST, n=18 in OVX and PROG rabbits). * p<0.05, ** p<0.01, *** p<0.001. B. Telemetric ECG recordings of the initiation of lethal pVT in two EST rabbits, top two rows. Indicated are R-on-T (red square), short-long-short sequences, and P waves (P) during episodes of AV 2:1 block. Bottom row shows several episodes of nsVTs following couplets in an EST rabbit. C. Incidence of major cardiac events during 8 weeks of hormone-treatment. Incidences of SCD are indicated in brackets. * p<0.05, ** p<0.01.