1997c-045 arrhythmia arrhythmias artificial atrialfibrillation cardiac cardiacpacing catheterablation congresses control diagnosis electricstimulation electrocardiography heartconductionsystem interventionalradiology methods pacemaker physiopathology prevention supraventricular tachyarrhythmias therapy treatment ventricular wg26c2691975 wg330p9441997 wg330r1292000