Theoretical analysis of the magnetocardiographic pattern for reentry wave propagation in a three-dimensional human heart model.
We present a computational study of reentry wave propagation using electrophysiological models of human cardiac cells and the associated magnetic field map of a human heart. We examined the details of magnetic field variation and related physiological parameters for reentry waves in two-dimensional (2-D) human atrial tissue and a three-dimensional (3-D) human ventricle model. A 3-D mesh system representing the human ventricle was reconstructed from the surface geometry of a human heart. We used existing human cardiac cell models to simulate action potential (AP) propagation in atrial tissue and 3-D ventricular geometry, and a finite element method and the Galerkin approximation to discretize the 3-D domain spatially. The reentry wave was generated using an S1-S2 protocol. The calculations of the magnetic field pattern assumed a horizontally layered conductor for reentry wave propagation in the 3-D ventricle. We also compared the AP and magnetocardiograph (MCG) magnitudes during reentry wave propagation to those during normal wave propagation. The temporal changes in the reentry wave motion and magnetic field map patterns were also analyzed using two well-known MCG parameters: the current dipole direction and strength. The current vector in a reentry wave forms a rotating spiral. We delineated the magnetic field using the changes in the vector angle during a reentry wave, demonstrating that the MCG pattern can be helpful for theoretical analysis of reentry waves.
Im
Uk Bin
UB
Department of Mechanical and Biomedical Engineering, Kangwon National University, Hyoja-dong, Chuncheon, Kangwon-do 200-701, Republic of Korea.
Kwon
Soon Sung
SS
Kim
Kiwoong
K
Lee
Yong Ho
YH
Park
Yong Ki
YK
Youn
Chan Hyun
CH
Shim
Eun Bo
EB
D000818:Animals; D006321:Heart / Q000502:physiology*; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D053798:Magnetocardiography; D008955:Models, Cardiovascular