Title :
Simulation of reentry induced by early afterdepolarizations during acute myocardial ischemia
Author :
Colomar, E. ; Ferrero, JM, Jr. ; Saiz, J.
Author_Institution :
Laboratorio Integrado de Bioingenieria, Univ. Politecnica de Valencia, Spain
Abstract :
Computer simulations were used to study the conditions which lead to the appearance of ectopic foci and to their propagation as re-entrant activity in partially ischemic tissue. To simulate action potentials, we used a modified version of the Luo-Rudy-II model (C.H. Luo & Y. Rudy, 1994), completed with the formulation of the ATP-sensitive potassium current [IK(ATP)] by J.M. Ferrero et al. (1996). The tissue was simulated as a ring-shaped structure comprising four different regions: early after-depolarizations (EADs), normal zone (NZ), ischemic zone (IZ) and border zone (BZ). Our results show that, when the length of each BZ is 2 mm, [K]0 is 13.5 mmol/l and the length of the NZ is more than 26 mm (260 cells), then ectopic beats appear in the EAD region and they propagate along the tissue, causing re-entry, regardless of the length of the NZ. In conclusion, our theoretical study shows that the co-existence of EAD-condition zones and regional ischemia could set the stage for the appearance of ectopic foci and re-entry
Keywords :
bioelectric potentials; biological tissues; biomembrane transport; cardiology; digital simulation; medical computing; physiological models; polarisation; ATP-sensitive K+ current; Luo-Rudy-II model; acute myocardial ischemia; adenosine triphosphate; border zone; cardiac action potentials; computer simulations; early after-depolarizations; ectopic beats; ectopic foci propagation; ischemic zone; membrane potential oscillations; normal zone; partially ischernic tissue; reentrant activity; reentry simulation; regional ischemia; ring-shaped structure; Biomembranes; Calcium; Computational modeling; Computer simulation; Delay; Heart rate variability; Ischemic pain; Laboratories; Myocardium; Potential well;
Conference_Titel :
Computers in Cardiology 2001
Conference_Location :
Rotterdam
Print_ISBN :
0-7803-7266-2
DOI :
10.1109/CIC.2001.977666