Limitations
Being a real-world retrospective observational analysis, our study lacks the randomization of potential future trials. Second, our research analyzed the populations of two high-volume nationwide referrals for VT ablation, whose results may not be generalized to all centers due to referral bias. Third, while PS matching is a viable tool for covariate homogenization, we can’t guarantee the non-inclusion of other potential confounding variables. Nonetheless, the verification of similar results in the PS population strengthens its conclusions. Fourth, it was not possible to access detailed information on the ventricular scars (voltage maps or cardiac magnetic resonance imaging) in all patients. At last, the choice of combined or non-combined strategy was done at the operator’s discretion, which may create a nonobjectifiable bias.