A Volume Conductor Model of the Thorax for the Study of Defibrillation Fields

Academic Article

Abstract

  • This paper develops a physiologically-realistic volume conductor model for calculating epicardial potentials during transthoracic stimulation. The objective of this study is to measure cardiac potentials during a transthoracic stimulus and compare the measurements to calculated epicardial potentials obtained from the model. Potential measurements during a stimulus are recorded for three closed-chest dogs. Four different torso electrode combinations (anterior-posterior, neck-waist, precordial, and right-left lateral) are used to deliver the stimulus. A boundary integral model is developed which utilizes electrode, heart, and torso geometry, the surface geometry from lung and skeletal muscle interfaces, and internal inhomogeneity conductivities to compute epicardial potentials from a knowledge of stimulus strength and location. The results indicate that for the homogeneous torso, the overall average rms error and correlation coefficient for all four stimulus configurations over the three dogs is 47.3 percent and 0.901, respectively. Incorporating the lungs into the model does not significantly influence the agreement between computed and measured potentials, but incorporating the skeletal muscle layer improves the agreement, i.e., correlation coefficients increase to 0.914 and rms errors decrease to 42.1 percent. © 1988 IEEE
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Claydon FJ; Pilkington TC; Tang ASL; Morrow MN; Ideker RE
  • Start Page

  • 981
  • End Page

  • 992
  • Volume

  • 35
  • Issue

  • 11