Schmidt J, Gatlin B, Eason J, Koomullil G, Pilkington T
National Science Foundation/Engineering Research Center, Department of Electrical Engineering, Duke University, Durham, North Carolina.
Crit Rev Biomed Eng. 1992;20(1-2):121-39.
This paper utilizes a structured and an unstructured grid representation of a torso with an anisotropic skeletal muscle to assess current distributions from defibrillation shocks. The results show that a finite-element solution on an unstructured grid of 400,000 elements (60,000 nodes) achieves comparable current distributions with a finite-difference solution on a structured grid that uses approximately the same number of nodes. Moreover, a finite-element solution on a 65,000-element (10,500 nodes) unstructured grid yielded fractional percent current results within 5% of the finer grids. The structured and unstructured grid models are used to investigate recent interpretations of experimental data that concluded that more than 80% of the total defibrillation current is shunted by the anisotropic skeletal muscle thoracic cage. It is concluded that these interpretations, which were based on a one-dimensional resistive network representation of the three-dimensional defibrillation situation, overestimate by 25% the current shunted by the anisotropic thoracic cage.
本文利用具有各向异性骨骼肌的躯干的结构化和非结构化网格表示来评估除颤电击产生的电流分布。结果表明，在具有400,000个单元（60,000个节点）的非结构化网格上的有限元解与在使用大致相同数量节点的结构化网格上的有限差分解实现了可比的电流分布。此外，在具有65,000个单元（10,500个节点）的非结构化网格上的有限元解产生的电流结果在较精细网格的5%以内。结构化和非结构化网格模型用于研究对实验数据的最新解释，这些解释得出结论，超过80%的总除颤电流被各向异性骨骼肌胸廓分流。得出的结论是，这些基于三维除颤情况的一维电阻网络表示的解释高估了各向异性胸廓分流的电流25%。
