Identification of local myocardial repolarization time by bipolar electrode potential.
OBJECTIVE
The aim of this study was to investigate whether bipolar electrode potentials (BEPs) reflect local myocardial repolarization dynamics, using computer simulation.


METHODS
Simulated action potential and BEP mapping of myocardial tissue during fibrillation was performed. The BEP was modified to make all the fluctuations have the same polarity. Then, the modified BEP (mBEP) was transformed to "dynamic relative amplitude" (DRA) designed to make all the fluctuations have the similar amplitude.


RESULTS
The repolarization end point corresponded to the end of the repolarization-related small fluctuation that clearly appeared in the DRA of mBEP. Using the DRA of mBEP, we could reproduce the repolarization dynamics in the myocardial tissue during fibrillation.


CONCLUSIONS
The BEP may facilitate identifying the repolarization time. Furthermore, BEP mapping has the possibility that it would be available for evaluating repolarization behavior in myocardial tissue even during fibrillation. The accuracy of activation-recovery interval was also reconfirmed.
Namba
Tsunetoyo
T
Department of Medical Technology, Kagawa Prefectural College of Health Sciences, Takamatsu, Japan. hqg04517@nifty.ne.jp
Todo
Takahiro
T
Yao
Takenori
T
Ashihara
Takashi
T
Haraguchi
Ryo
R
Nakazawa
Kazuo
K
Ikeda
Takanori
T
Ohe
Tohru
T
D001281:Atrial Fibrillation / Q000503:physiopathology*; D018780:Body Surface Potential Mapping / Q000379:methods*; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004562:Electrocardiography / Q000379:methods*; D004566:Electrodes; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008955:Models, Cardiovascular