Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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A Simulation study on the Cardiac Current Density distribution during the Defibrillation Shock

제세동 쇼크에 의한 심장 전류밀도 분포에 관한 시뮬레이션 연구

  • Lee, J. (Department of Biomedical Engineering, College of Health Science and Research Institute of Medical Engineering, Yonsei University) ;
  • Park, K. L. (Department of Biomedical Engineering, College of Health Science and Research Institute of Medical Engineering, Yonsei University) ;
  • Lee, K. J. (Department of Biomedical Engineering, College of Health Science and Research Institute of Medical Engineering, Yonsei University)
  • 이전 (연세대학교 보건과학대학 의용전자공학과, 의공학연구소) ;
  • 박광리 (연세대학교 보건과학대학 의용전자공학과, 의공학연구소) ;
  • 이경중 (연세대학교 보건과학대학 의용전자공학과, 의공학연구소)
  • Published : 2000.08.01
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Abstract

This paper is about to simulate the defibrillation situations using 3D FE(finite element) thorax model and describes the effects of three clinical electrodes' positions and size and organ's resistivity used in simulation on the characteristics of current density distribution over myocardium. The model was constructed with a eillipsoidal cylinder for the thorax and the 2D Visible Human images for remains. And, the distributions of current density were computed by a commercial program ANSYS 5.4. The electrical shock of the AP(anterior-posterior ) electrode provided more current flows with heart than the others and that of the LL(lateral-lateral) electrode showed the most uniform current density distribution. However, the electrode size had little effect on the current density distribution. In the evaluation of model's sensitivity to tissue resistivity variation, the variation of the myocardium's resistivity most affected the minimum, average and maximum current densities.

본 연구는 3차원 유한요소 몸통 모델을 이용한 제세동 시뮬레이션 연구로서, 제세동 자극인가시 임상에서 사용되는 세가지 전극의 위치와 크기가 심장에서의 전류밀도 분포특성에서 미치는 영향과 시뮬레이션에 사용되는 조직의 비저항 값이 시뮬레이션 결과에 미치는 영향에 대하여 시뮬레이션 하였다. 몸통 모델은 타원형 실린더를 사용하여 흉곽을 모델링하였고, 나머지 부분은 Visible Human의 2차원 영상들을 통하여 3차원 모델링을 하였다. 그리고, ANSYS 5.4를 통하여 유한요소의 전류밀도 해를 구하였다. AP(anterior-posterior) 전극 위치의 경우, 몸통 표면에서 인가한 전류가 가장 효과적으로 심장으로 흘러들어 갔으며, LL(Lateral-lateral) 전극 AP(anterior-posterior) 전극 위치의 경우, 몸통 표면에서 인가한 전류가 가장 효과적으로 심장으로 흘러들어갔으며, LL(lateral-lateral) 전극위치는 가장 균일한 전류밀도 분포특성을 나타내었다. 그러나, 전극의 크기변화는 전류밀도 분포특성에 거의 영향을 주지 않았다. 조직의 비저항 값의 변화에 대한 전류밀도 분포 실험결과는 심근의 비저항 값의 변화가 최소·평균·최대 전류밀도 해에 가장 큰 영향을 주었다.

Keywords

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