Limitations
This is a single center observational study with the inherent limmitations to this study design and using the specific strategy described so the results can not be extrapolated to other VT ablation protocols. Further randomized studies comparing substrate ablation vs. baseline VT induction + activation mapping when possible + critical isthmus substrate ablation should be encouraged to definitively elucidate the role of baseline VT inducibility and activation mapping in this setting. A significant percentage of patients was on active treatment with antiarrhythmic drugs at the time of the procedure and this could have influenced the results of baseline PVS.