NDLI: An integral equation model for intracardiac electrogram sensing

Content Provider	IEEE Xplore Digital Library
Author	Weimin Sun Xiaoyi Min
Copyright Year	1964
Abstract	The electrogram sensed by an intracardiac electrode has long been characterized based on two approaches: (1) presuming that the electrode is very small and does not disturb the potential prior to applying the electrode; and (2) taking an average of the prior potential over the electrode surface. In fact, any intracardiac sensing electrode has a finite surface area where electrical charges are induced and disturb the external potential field, thus, the sensed potential is different from the potential prior to placing the electrode. In this paper, an integral equation model is proposed based on the current continuity equation in a homogeneous myocardial medium. The new model can accurately characterize the electrogram sensed by an electrode with a nonnegligible surface area and a load impedance. The new model can be solved numerically via the method of moments to obtain the potential induced on the electrode surface by an arbitrary dipole volume source. As an application of the proposed theory, several electrode configurations with different loads have been analyzed with an intent to show that a finite electrode surface will significantly reduce the electrogram peak amplitude and slope, and a load impedance lower than 20 k/spl Omega/ will also degrade the electrogram sensitivity.
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	6
File Size	137072
Starting Page	1237
Ending Page	1242
File Format	PDF
ISSN	00189294
Volume Number	44
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Integral equations Myocardium Biomedical electrodes Surface impedance Sun Surface waves Moment methods Degradation Bandwidth
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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