Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram.

Thomas Everett, Israel Byrd, Emily Wilson, Jamie Skoglund, Jeffrey Olgin

Research output: Contribution to journalArticle

Abstract

Convention holds that the magnitude of an electrogram (EGM) recorded from an ablation catheter indicates proximity to the tissue and may be used to guide tip placement. The shift in capacitance (phase angle) as the electrode touches the tissue may be a better guide. We compared these two methods over a range of distances in close proximity to heart tissue. This study suggests that EGM is not a reliable predictor of proximity to tissue within a few millimeters of the surface. Thus, EGM alone should not be used to guide electrode placement for ablation, as a millimeter off the surface will shift a greater percentage of delivered energy to the blood pool rather than the target tissue. EGM should also not be used to gauge force of the catheter into tissue. Phase angle is a better predictor of both variables, but an optimal combination of predictors remains to be found.

Original languageEnglish (US)
Pages (from-to)1733-1736
Number of pages4
JournalConference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference
StatePublished - 2008
Externally publishedYes

Fingerprint

Catheters
Electrodes
Tissue
Ablation
Catheter Ablation
Touch
Gages
Blood
Capacitance

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

Cite this

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AU - Everett, Thomas

AU - Byrd, Israel

AU - Wilson, Emily

AU - Skoglund, Jamie

AU - Olgin, Jeffrey

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