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Field stimulation of cardiac fibers with random spatial structure.

Publication ,  Journal Article
Krassowska, W
Published in: IEEE transactions on bio-medical engineering
January 2003

Polarization of individual cells ("sawtooth") has been proposed as a mechanism for field stimulation and defibrillation. To date, the modeling work has concentrated on the myocardium with periodic spatial structure; this paper investigates potentials arising in cardiac fibers with random spatial structure. Ten different random fibers consisting of cells with varying length (l(c) = 100 +/- 50 microm), diameter (d(c) = 20 +/- 10 microm), thickness of extracellular space (t(e) = 1.18 +/- 0.59 microm), and junctional resistance (R(j) = 2 +/- 1 M(omega)) are studied. Simulations demonstrate that randomizing spatial structure introduces to the field-induced potential (V(m)) a randomly varying baseline, which arises due to polarization of groups of cells. This polarization appears primarily in response to randomizing t(e); R(j), l(c), and d(c) have less influence. The maximum V(m) increases from 3.5 mV in a periodic fiber to 20.5+/-4.7 mV in random fibers (1 V/cm field applied for 5 ms). Field stimulation threshold E(th) decreases from 6.9 to 1.59 +/- 0.43 V/cm, which is within the range of experimental measurements. Thresholds for normal and reversed field polarities are statistically equivalent: 1.59 +/- 0.43 versus 1.44 +/- 0.41 V/cm (p value = 0.453). Thus, V(m) arising due to random structure of the myocardium may play an important role in field stimulation and defibrillation.

Duke Scholars

Published In

IEEE transactions on bio-medical engineering

DOI

EISSN

1558-2531

ISSN

0018-9294

Publication Date

January 2003

Volume

50

Issue

1

Start / End Page

33 / 40

Related Subject Headings

  • Sensitivity and Specificity
  • Reproducibility of Results
  • Myofibrils
  • Myocytes, Cardiac
  • Myocardial Contraction
  • Models, Statistical
  • Models, Cardiovascular
  • Models, Biological
  • Membrane Potentials
  • Humans
 

Citation

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MLA
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Krassowska, W. (2003). Field stimulation of cardiac fibers with random spatial structure. IEEE Transactions on Bio-Medical Engineering, 50(1), 33–40. https://doi.org/10.1109/tbme.2002.807324
Krassowska, Wanda. “Field stimulation of cardiac fibers with random spatial structure.IEEE Transactions on Bio-Medical Engineering 50, no. 1 (January 2003): 33–40. https://doi.org/10.1109/tbme.2002.807324.
Krassowska W. Field stimulation of cardiac fibers with random spatial structure. IEEE transactions on bio-medical engineering. 2003 Jan;50(1):33–40.
Krassowska, Wanda. “Field stimulation of cardiac fibers with random spatial structure.IEEE Transactions on Bio-Medical Engineering, vol. 50, no. 1, Jan. 2003, pp. 33–40. Epmc, doi:10.1109/tbme.2002.807324.
Krassowska W. Field stimulation of cardiac fibers with random spatial structure. IEEE transactions on bio-medical engineering. 2003 Jan;50(1):33–40.

Published In

IEEE transactions on bio-medical engineering

DOI

EISSN

1558-2531

ISSN

0018-9294

Publication Date

January 2003

Volume

50

Issue

1

Start / End Page

33 / 40

Related Subject Headings

  • Sensitivity and Specificity
  • Reproducibility of Results
  • Myofibrils
  • Myocytes, Cardiac
  • Myocardial Contraction
  • Models, Statistical
  • Models, Cardiovascular
  • Models, Biological
  • Membrane Potentials
  • Humans