Number of premature ventricular contractions (PVCs), rate of dangerous VAs and non-sustained ventricular tachycardia (NSVT) in group 1 were higher than that in group 2: 2030.2 ± 6641.5 compared with 789.8 ± 3899.3; 82.2% compared with 54.2% and 27.4% compared with 6.3% p<0.01 respectively.