Limitations
We admit some potential limitations in the current study. The first limitation was that the period of patient enrollment was long, and it was a single center study. The second limitation was the relatively small population. The third limitation was inconsistencies in the detection of RR-NSVT as heterogeneous brands of ICD/CRT-D were used. Nonetheless, in our study, RR-NSVT documentation in ICD/CRT-D was important for the prediction of future sustained VTA occurrence in DCM patients. This finding calls for a large registry to detect patients with cluster or frequent RR-NSVTs and analyze treatment and preventive strategies for future VTAs in a similar population.