Relationship between extracellular T-wave height, T-wave alternans amplitude, and tissue action potential alternans: a 1-dimensional computer modeling study.
Journal Article (Journal Article)
T-wave alternans (TWA) is a useful marker of cardiac instability, but not much is known about the factors that affect its measurement, such as electrode placement. We used a 1-dimensional myocardial fiber computer model of alternans to investigate the effect of electrode position on TWA measurement. Results demonstrated that TWA amplitude and T-wave amplitude change proportionally if both recording electrodes are symmetrically moved toward or away from the tissue. However, TWA amplitude and T-wave amplitude change out of proportion to one another when one electrode is moved while the other electrode remains stationary. These disproportionate changes result from beatwise alternation in the asymmetric potential field around the tissue. In summary, nonlinear changes in tissue repolarization during alternans result in nonlinear changes in T-wave amplitude and TWA amplitude.
Full Text
Duke Authors
Cited Authors
- Doshi, AN; Idriss, SF
Published Date
- November 2009
Published In
Volume / Issue
- 42 / 6
Start / End Page
- 549 - 554
PubMed ID
- 19616219
Pubmed Central ID
- PMC5466875
Electronic International Standard Serial Number (EISSN)
- 1532-8430
Digital Object Identifier (DOI)
- 10.1016/j.jelectrocard.2009.06.012
Language
- eng
Conference Location
- United States