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Durability of mitral isthmus ablation with and without ethanol infusion in the vein of Marshall
Author(s) -
Ishimura Masayuki,
Yamamoto Masashi,
Himi Toshiharu,
Kobayashi Yoshio
Publication year - 2021
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/jce.15107
Subject(s) - medicine , ablation , atrial fibrillation , atrial tachycardia , cardiology , radiofrequency ablation , ablation of atrial fibrillation , catheter ablation , surgery
Ethanol infusion in the vein of Marshall (EIVOM) effectively creates a linear ablation lesion in the mitral isthmus (MI). However, data on the long‐term success rates of MI ablation is limited. Methods and Results Our cohort consisted of 560 patients with nonparoxysmal atrial fibrillation (AF) who underwent an initial MI ablation. Ablations were performed by only radiofrequency (RF) in 384 (RF group) or by RF and EIVOM in 176 (EIVOM/RF group) patients; 5 ml anhydrous ethanol was used to perform EIVOM in advance of RF. Following EIVOM, RF pulses were delivered to the lateral MI line. Bidirectional MI block was fully achieved in 353/384 (92%) (First 318, Re‐do 35) patinents in the RF group and 171/176 (97%) (First 128, Re‐do 43) patients in the EIVOM/RF group ( p = .09 in the first, p = .10 in the re‐do ablation cases). In cases with complete MI line block, recurrent AF or atrial tachycardia was observed in 130/353 (37%) patients in the RF group and in 64/171 (37%) patients in the EIVOM/RF group (log‐rank p = .12 in the first, and p = .30 in the re‐do ablation cases). Of the total 560 patients, 123 proceeded to the subsequent ablation session. Reconduction across MI line block was observed in 39/80 (49%) patients in the RF group and 25/43 (58%) patients in the EIVOM/RF group ( p = .32). Conclusion EIVOM effectively ensures MI line block; however, the reconduction rate was similar between the two groups.