the most serious arrhythmia appeared at a mean age of 23.4 years , 20 had clinical sustained ventricular tachycardia ( vt ) ( 19/20 , 95 % during sports activity ) , six non-sustained vt and one ventricular fibrillation ( vf ) .
C0003811
arrhythmia
C0042510
ventricular fibrillation