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Radiofrequency ablation of ventricular arrhythmias arising from deep myocardium (coronary perfused beating hearts in the dual-bath experimental setting)

Research Project

Project/Area Number 19K08512
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53020:Cardiology-related
Research InstitutionNiigata University

Principal Investigator

Chinushi Masaomi  新潟大学, 医歯学系, 教授 (40303151)

Co-Investigator(Kenkyū-buntansha) 齋藤 修  新潟大学, 医歯学系, 講師 (40752457)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords高周波アブレーション / 不整脈 / カテーテルアブレーション / 心室不整脈
Outline of Research at the Start

食肉センターで処理直後の食用豚心臓に心筋保護液を注入する。Tyrode液を灌流して自己心拍の再開を得る。ペーシング電極と記録電極を装着してDual bathモデルに固定する。Bipolarモードは心内膜側と心外膜側の2本のイリゲーション型アブレーションカテーテル間で通電を行う。Unipolarモード、Sequentialモード、Simultaneousモードは、Dual bathの各チャンバーに留置するイリゲーション型アブレーションカテーテルと対極板間で通電を行う。各通電の心筋興奮に対する効果・焼灼傷の形成過程・スチームポップの発症機転を解析する。焼灼傷をHE染色と横紋筋染色で評価する。

Outline of Final Research Achievements

Using an experimental model of porcine myocardium that beat and contract with coronary perfusion, we constructed an experimental system in which radiofrequency ablation can be performed while monitoring myocardial excitation (local potential, excitation threshold and electrocardiogram), delivering electrical parameters (current, voltage, and impedance), and ultrasound imaging information.
The following approaches were considered effective in improving ablation efficiency; (1) use of the Bipolar ablation method, and (2) appropriately long application time for maximizing the conduction heating effect. Short-time application using irrigation catheter may restore the excitation of superficial myocardium. Important items to ensure safety were as follows; (1) avoid high power energy delivered by Bipolar ablation method for thin myocardial areas to prevent steam-pop, and (2) limit total impedance drop during ablation within 20-25 ohm

Academic Significance and Societal Importance of the Research Achievements

医用工学の進歩によって不整脈起源の局在を視覚同定することが可能となったが、心筋表層起源とは異なり、深部心筋起源を安定焼灼する治療技術の開発は大きく遅れている。しかし心臓突然死の主要原因である重症心室不整脈(心室細動・心室頻拍)は深部心筋起源の場合が多く、現在も難治症例を多く経験する。今回の課題は臨床例の高周波アブレーション治療を模倣した実験環境を構築して行い、心筋焼灼に関わる複数因子を網羅的に設定して有効性と安全性に優れた通電条件を検証した。深部起源の重症不整脈の治療は、救命、自立した社会復帰、医療経済などの複数観点から重要かつ有益で、医療現場と地域社会の要求に合致した成果と考えている。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (8 results)

  • [Journal Article] Excitation Recovery on the Surface Myocardium After Shorter but Not Nominal Time Radiofrequency Application Using an Open Irrigation Catheter2022

    • Author(s)
      Chinushi M, Saitoh O
    • Journal Title

      Circ Arrhythm Electrophysiol.

      Volume: Jan;15(1) Issue: 1

    • DOI

      10.1161/circep.121.010392

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impedance decrement indexes for avoiding steam-pop during bipolar radiofrequency ablation: An experimental study using a dual-bath preparation2020

    • Author(s)
      Saitoh O, Oikawa A, Sugai A, Chinushi M.
    • Journal Title

      J Cardiovasc Electrophysiol .

      Volume: Dec;31(12) Issue: 12 Pages: 3302-3310

    • DOI

      10.1111/jce.14764

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Enhanced arrhythmogenic potential induced by renal autonomic nerve stimulation: Role of renal artery catheter ablation.2020

    • Author(s)
      Chinushi M, Saitoh O, Sugai A, Oikawa A, Watanabe J, Furushima H
    • Journal Title

      Heart Rhythm

      Volume: Jan; 17(1) Issue: 1 Pages: 133-141

    • DOI

      10.1016/j.hrthm.2019.07.029

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Difference in the Myocardial Excitation Recovery between Shorter and Nominal Time Radiofrequency Application2022

    • Author(s)
      Chinushi M, Saitoh O, Fuse K, Kasai T, Furushima H.
    • Organizer
      2022年日本循環器学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Impedance decrement represents intramyocardial temperature (IT) and myocardial degeneration in bipolar radiofrequency (RF) ablation2022

    • Author(s)
      Saitoh O, Fuse K, Kasai T, Furushima H、Chinushi M
    • Organizer
      2022年日本循環器学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] インピーダンスモニタリングから推定する至適心筋焼灼温度2022

    • Author(s)
      笠井琢充、齋藤修、布施亨伍、橋本海弥、上村準人 、林尋、横山悠里 、畠山杏子、佐藤佳歩、池主雅臣
    • Organizer
      2022年日本不整脈心電学会地方会
    • Related Report
      2021 Annual Research Report
  • [Presentation] バイポーラ高周波通電におけるインピーダンスモニタリング。心筋内温度とスチームポップ回避2021

    • Author(s)
      齋藤修、笠井琢充、布施亨伍、及川綾花、池主雅臣
    • Organizer
      2021年日本不整脈心電学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Steam-pop induced Central or Surface Myocar dial Disruption during Bipolar Radiofrequency Catheter Ablation2021

    • Author(s)
      齋藤 修 、及川 綾花 、菅井 綾里 、池主 雅臣
    • Organizer
      第85回日本循環器学会総会(2021/3/26-28)
    • Related Report
      2020 Research-status Report
  • [Presentation] Impedance Monitoring for Predicting Steam-pop: An Experimental Study of Bipolar Radiofrequency Ablation Using a Dual-bath Preparation2021

    • Author(s)
      齋藤 修 、及川 綾花 、菅井 綾里 、池主 雅臣
    • Organizer
      第85回日本循環器学会総会(2021/3/26-28)
    • Related Report
      2020 Research-status Report
  • [Presentation] Lesion Characteristics Created by Short- and Nominal-time of RF Application: Requirement of Appropriate Application Time for Stable Lesions2020

    • Author(s)
      Saitoh O, Chinushi M
    • Organizer
      日本循環器学会総会
    • Related Report
      2019 Research-status Report
  • [Presentation] Reduction of the unexcitable myocardium depth and recovery of surface excitability after shorter radiofrequency application in an experimental model of porcine myocardium2020

    • Author(s)
      Chinushi M, Saitoh O
    • Organizer
      Heart Rhythm 2020
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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