of the 17 patients in group i , 8 had no induced arrhythmia ( less than or equal to 4 extra responses ) , 4 had nonsustained ventricular tachycardia and 5 had sustained ventricular tachycardia ( degenerating into ventricular fibrillation requiring electrical reversion in 4 ) .
C0003811
arrhythmia
C0042510
ventricular fibrillation