common ambulatory electrocardiographic features in these 12 patients experiencing ventricular fibrillation or torsade de pointes included : 1 ) a period of high density of increasingly frequent or complex ventricular arrhythmias , or both , preceding ventricular fibrillation or torsade de pointes ( 11 patients ) ;
C0085612
ventricular arrhythmias
C0042510
ventricular fibrillation