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.