Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Plank, G; Vigmond, E; Leon, LJ; Hofer, E.
Cardiac near-field morphology during conduction around a microscopic obstacle--a computer simulation study.
Ann Biomed Eng. 2003; 31(10):1206-1212
Doi: 10.1114%2F1.1615573
Web of Science
PubMed
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- Führende Autor*innen der Med Uni Graz
- Plank Gernot
- Co-Autor*innen der Med Uni Graz
- Hofer Ernst
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- Abstract:
- In a recent paper, we described the behavior of the cardiac electric near-field, E, parallel to the tissue surface during continuous conduction. We found that the tip of E describes a vector-loop during depolarization with the peak field, E, pointing opposite to the direction of propagation, phiI(m). Experimentally recorded loop morphologies of E, however, frequently showed significant deviations from the theoretically predicted behavior. We hypothesized that this variety of morphologies might be caused by conduction obstacles at a microscopic size scale. This study examines the influence of obstacles on the morphology of vector loops of E and whether the peak of distorted loops remains a reliable indicator for the direction of propagation. We used a computer model of a sheet of cardiac tissue with a central conduction obstacle immersed in an unbounded volume conductor. We studied the loop morphologies of E and the differences between the intracellularly determined direction of propagation, phiI(m), and the direction of E, phiE. Distortions of the vector loop were morphologically similar to those observed experimentally. Differences between phiI(m) and phiE were less than 18 degrees at all observation sites. The obstacle led to deformations of the loop morphology, particularly during the initial and terminal phases, and to a lesser degree near the instant of E. We concluded that E is a reliable indicator of phiI(m).
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- cardiac tissue
- electric field
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- vector-loop morphology
- conduction obstacle
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