DISCUSSION
The followings are the major findings of the present study. Firstly,
half of DCM patients with ICD/CRT-D had at least one episode of RR-NSVT
whether they were on primary or secondary prevention. In addition, 25%
had experienced more than 3 RR-NSVT episodes. Secondly, any RR-NSVT had
a positive association with VTA occurrence. Finally, cluster (≥3 times/6
months) and frequent patterns (≥3 runs/day) of RR-NSVT were observed in
42.6% (29/68) and 30.9% (21/68) of patients with RR-NSVT, respectively
and these patients showed a further increased incidence of VTAs.