on 24-hour ambulatory ecg monitoring 29 patients ( 88 % ) in a young group had arrhythmias which was as frequent as those in adult group , but serious ventricular arrhythmias were more often detected in the young group ( 7 patients ) than in the adult group ( 2 patients ) .
C0003811
arrhythmias
C0085612
ventricular arrhythmias