Acute success rate of MI ablation
Table 2 summarizes the ablation data. Bidirectional MI block line in the first ablation cases was fully achieved in 318 (92%) and 128 (96%) patients in the RF group and EIVOM/RF group, respectively (p = 0.09). Complete MI line block was also achieved in 35 (92%) and 43 (100%) in each group in re-do ablation cases (p = 0.10). The application time of MI ablation in the EIVOM/RF group was significantly shorter than that in the RF group (First 802 ± 407 s, Re-do 738 ± 428 s in the RF group vs. First 502 ± 220 s, Re-do 538 ± 205 s in the EIVOM/RF group, p < 0.01 in both). However, total radiation exposure was greater in the EIVOM/RF group compared to the RF group (First 315 ± 252 mGy, Re-do 305 ± 223 mGy in the RF group vs. First 495 ± 336 mGy, Re-do 418 ± 446 mGy in the EIVOM/RF group, p < 0.01 in the first, p = 0.17 in the re-do ablation). This is because fluoroscopy was required more frequently for insertion of a guidewire or infusion of ethanol into the VOM during angiography. The rate of ablation from the inside of the CS was similar between groups. Bottom line ablation was less performed in the EIVOM/RF group than in the RF group. Pericardial effusion was observed in four patients in the RF group. Two of these patients experienced cardiac tamponade caused by a steam pop while ablating the MI, in which immediate pericardiocentesis was required.