in the control group , cardiac arrhythmias for which treatment was necessary developed in 31 of 136 patients ( 23 % ) , atrial fibrillation or flutter in 24 patients ( 18 % ) , and ventricular arrhythmias in 7 ( 5 % ) .
C0003811
cardiac arrhythmias
C0085612
ventricular arrhythmias