• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Electrophysiological characteristics of ventricular arrhythmias developed in hypothermic conditions.

Research Project

Project/Area Number 19K08574
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

Saitoh Osamu  新潟大学, 医歯学系, 講師 (40752457)

Co-Investigator(Kenkyū-buntansha) 池主 雅臣  新潟大学, 医歯学系, 教授 (40303151)
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: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords低体温 / 不整脈 / 連続ウェーブレット変換 / Wavelet / 心室不整脈
Outline of Research at the Start

山岳遭難、水難事故、除雪作業事故などに起因する低体温が進行すると、治療抵抗性の致死性不整脈(低体温不整脈)を発症する危険が生じる。低体温不整脈は正常体温で発症した不整脈に比べて薬物療法・除細動通電が有効でないことが知られているが、そのメカニズムは十分に明らかにされてはいない。そこで①低体温不整脈が治療抵抗性となる電気生理学的機序は何か(心臓で何が起きているのか)、②低体温不整脈の発症を予測する指標は何か、③救命するためのより適切な介入方法(復温方法、薬剤など)は何か、について食用ブタの摘出した心臓を用いて低体温状態を再現し、復温不十分な状況で心室不整脈が生じた場合の緊急治療法の構築を目指す。

Outline of Final Research Achievements

This study was performed to clarify hypothermia arrhythmias' electrophysiological and excitatory characteristics using the porcine heart model.
The main findings of this study were as follows; suppressed automaticity, slowed conduction, prolonged repolarization, more heterogeneous distribution of repolarization, higher pacing stimulus threshold and reduced cardiac contraction were observed as myocardial temperature decreased (37, 32, 28℃). In addition, ventricular arrhythmias were most frequently induced at 28 ℃ by programmed electrical stimulation. Ventricular fibrillation in advanced hypothermia was accompanied by an increased defibrillation threshold and decreased dominant frequency and power.
These results seemed to be characterized as therapy-resistant ventricular arrhythmias in the advanced hypothermic condition.

Academic Significance and Societal Importance of the Research Achievements

雪山遭難、海難事故などで生じる低体温不整脈が治療抵抗性を示す機序を解明するため低体温環境を再現して基礎実験を行った。本研究では食用ブタ心臓モデルを用い、心電図指標および心室不整脈の周波数解析から①心筋温度低下に伴って形成される不整脈基盤の電気生理学的特徴、②心室不整脈の興奮特性(周波数、パワー値)を明らかにし、低体温で生じる心室細動が治療抵抗性を示す要因を見出した。これらの知見は重症低体温症例の救命と自立性の高い社会復帰の実現、低体温療法の安全性向上に貢献するものと考える。

Report

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

    (18 results)

All 2022 2021 2020 2019

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 1 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] Anti‐tachycardia pacing for non‐fast and fast ventricular tachycardias in individual Japanese patients: From Nippon‐storm study2021

    • Author(s)
      Chinushi Masaomi、Saitoh Osamu、Furushima Hiroshi、Aizawa Yoshifusa、Noda Takashi、Nitta Takashi、Ohe Tohru、Kurita Takashi
    • Journal Title

      Journal of Arrhythmia

      Volume: 37 Issue: 4 Pages: 1038-1045

    • DOI

      10.1002/joa3.12572

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bepridil Inhibits Premature Ventricular Complexes Induced by Cardio-Sympathetic Nerve Stimulation in a Canine Experimental Model2020

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

      International Heart Journal

      Volume: 61 Issue: 2 Pages: 338-346

    • DOI

      10.1536/ihj.19-494

    • NAID

      130007821511

    • ISSN
      1349-2365, 1349-3299
    • Year and Date
      2020-03-28
    • Related Report
      2020 Research-status Report 2019 Research-status 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
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Patient-by-patient basis anti-tachycardia pacing for fast ventricular tachycardia with structural heart diseases.2020

    • Author(s)
      Chinushi M, Furushima H, Saitoh O, Noda T, Nitta T, Aizawa Y, Ohe T, Kurita T.
    • Journal Title

      Pacing Clin Electrophysiol.

      Volume: 43 Issue: 9 Pages: 983-991

    • DOI

      10.1111/pace.13980

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [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
  • [Journal Article] Therapy-Resistant Ventricular Arrhythmias Developed More Often in Advanced Than in Therapeutic Mild Hypothermic Condition2019

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

      International Heart Journal

      Volume: 60 Issue: 5 Pages: 1161-1167

    • DOI

      10.1536/ihj.18-711

    • NAID

      130007719028

    • ISSN
      1349-2365, 1349-3299
    • Year and Date
      2019-09-27
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Impedance Decrement Represents Intramyocardial Temperature (IT) rather than Myocardial Degeneration in Bipolar Radiofrequency (RF) Ablation2022

    • Author(s)
      Osamu Saitoh, Takumi Kasai, Kyogo Fuse, Hiroshi Furushima, Masaomi Chinushi
    • Organizer
      The 86th. Annual Scientific Meeting of the Japanese Circulation Society
    • Related Report
      2021 Annual Research Report
  • [Presentation] Difference in the Myocardial Excitation Recovery between Shorter and Nominal Time Radiofrequency (RF) Application2022

    • Author(s)
      Masaomi Chinushi, Osamu Saitoh, Kyogo Fuse, Takumi Kasai, Hiroshi Furushima
    • Organizer
      The 86th. Annual Scientific Meeting of the Japanese Circulation Society
    • Related Report
      2021 Annual Research Report
  • [Presentation] Intra-cardiac echocardiogram-guided radiofrequency catheter ablation for more safe and effective outcomes: Observations from an experimental study2021

    • Author(s)
      Osamu Saitoh, Ayaka Oikawa, Ayari Sugai, Masaomi Chinushi
    • Organizer
      Annual meeting of the Japanease Heart Rhythm Society 2021
    • 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
      日本不整脈心電学会 アブレーション関連 秋季大会2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Impedance monitoring for predicting steam-pop: an experimental study of bipolar (BIP) radiofrequency (RF) ablation using a dual-bath preparation2021

    • Author(s)
      Osamu Saitoh, Ayaka Oikawa, Ayari Sugai, Masaomi Chinushi
    • Organizer
      The 85th. Annual Scientific Meeting of the Japanese Circulation Society
    • Related Report
      2020 Research-status Report
  • [Presentation] Steam-pop-induced surface or extensive myocardial disruption during bipolar radiofrequency catheter ablation2021

    • Author(s)
      Osamu Saitoh, Ayaka Oikawa, Ayari Sugai, Masaomi Chinushi
    • Organizer
      The 85th. Annual Scientific Meeting of the Japanese Circulation Society
    • 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)
      Osamu Saitoh, Ayaka Oikawa, Ayari Sugai, Akiko Sanada, Shinsuke Okada, Hirotaka Sugiura, Hiroshi Furushima, Masaomi Chinushi
    • Organizer
      The 84th. Annual Scientific Meeting of the Japanese Circulation Society
    • Related Report
      2020 Research-status Report
  • [Presentation] Therapeutic Effects of Bepridil and Verapamil for Premature Ventricular Complexes Induced During the Enhancement of Cardio-sympathetic Nerve Activity2020

    • Author(s)
      Osamu Saitoh, Ayaka Oikawa, Ayari Sugai, Junya Watanabe, Hiroshi Furushima, Masaomi Chinushi
    • Organizer
      The 84th. Annual Scientific Meeting of the Japanese Circulation Society
    • Related Report
      2020 Research-status Report
  • [Presentation] 高周波カテーテルアブレーション(短時間通電による焼灼傷の特徴)2019

    • Author(s)
      齋藤修, 及川綾花, 菅井綾里, 古嶋博司, 池主雅臣
    • Organizer
      第39回 日本ホルター・ノンインベイシブ心電学研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] バランス・アンバランス型交感神経緊張負荷に伴う心電図変化と心室不整脈2019

    • Author(s)
      菅井綾里, 齋藤修, 及川綾花, 渡辺順也, 鈴木克弥,池主雅臣
    • Organizer
      第39回 日本ホルター・ノンインベイシブ心電学研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Balanced and unbalanced augmentation of sympathetic nerve activity and its correlation to specific ECG features in cardiovascular diseases2019

    • Author(s)
      Ayari Sugai, Osamu Saitoh, Ayaka Oikawa, Junya Watanabe, Hiroshi Furushima, Masaomi Chinushi
    • Organizer
      12th. Asia Pacific Heart Rhythm Society Scientific Session
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi