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Maze Surgery Using the General-purpose Cryosurgical Unit ‘Freeze Stick M’ Takehiko Matsuo 1 , Takahide Takeda 1 , Masahide Kawatou 1 , Fumie Takai 1 , Kazuhiro Takatoku 1 , Hiromasa Kira 1 , Yasuyuki Fujimoto 1 , Haruka Fujimoto 1 , Ryo Nakanishi 1 , Kazuyoshi Kanno 1 , Tadashi Ikeda 1 , Kenji Minatoya 1 1Department of Cardiovascular Surgery, Kyoto University Keyword: maze surgery , cryosurgery , nondisposable cryosurgical device pp.411-417
Published Date 2025/6/1
DOI https://doi.org/10.15106/j_kyobu78_411
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Background:Maze surgery for atrial fibrillation (AF) has increasingly utilized disposable cryoablation and radiofrequency devices. However, reusable ablation devices are preferred for reducing healthcare costs. At our department, the general-purpose cryosurgical unit “Freeze Stick M” has been used for maze surgery and intercostal nerve block during left thoracotomy, effectively minimizing postoperative pain.

Patients and methods:Between August 2016 and July 2024, 44 patients underwent arrhythmia surgery for AF (36 chronic AF, 8 paroxysmal AF). The mean age was 71.9±7.6 years, with 66% males. Surgical procedures included biatrial maze (25 cases), pulmonary vein isolation (16 cases), left atrial maze (2 cases), and right atrial maze (1 case), all with left atrial appendage closure. Outcomes were compared between the SIM group (Freeze Stick M) and AC group (AtriCure).

Results:The 30-day mortality rate was 2.3%. Postoperative survival was 90.0% at 1 year, 81.0% at 3 and 5 years, and 67.5% at 7 years. AF-free rates at discharge were 76.2% (SIM) vs. 73.9% (AC). For chronic AF, AF-free rates at 5 years were 41.9% (SIM) vs. 38.5% (AC)(p=0.168).

Conclusion:The general-purpose cryosurgical unit “Freeze Stick M” performed similarly to the AtriCure device as a lesion-creation device.


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電子版ISSN 2432-9436 印刷版ISSN 0021-5252 南江堂

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