Limitations
The present study has several limitations. First, we used the location
of successful RFCA at the RVOT or LVOT as the PVC/VT site of origin. It
is possible that PVCs/VTs with an LVOT origin could be abolished from
the RVOT. Second, a study recently reported about preferential
conduction across the ventricular outflow septum[19]. The presence
of preferential conduction decreases the reliability of the accuracy of
determining VA origin. Third, extremely rare VAs may have multiple
exits, and during ablation, their exit pathways may change; therefore,
an altered ablation target may be needed. Lastly, to increase the
reliability of the algorithm, further prospective studies with a larger
sample size are warranted.