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

Thomas H. Everett IV, Israel Byrd, Emily Wilson, Jamie Skoglund, Jeffrey Olgin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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)
Title of host publicationProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
Pages1733-1736
Number of pages4
StatePublished - Dec 1 2008
Event30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - Vancouver, BC, Canada
Duration: Aug 20 2008Aug 25 2008

Publication series

NameProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology"

Other

Other30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
CountryCanada
CityVancouver, BC
Period8/20/088/25/08

Fingerprint

Catheters
Electrodes
Tissue
Ablation
Catheter Ablation
Touch
Gages
Blood
Capacitance

Keywords

  • Catheter ablation
  • Electrophysiology

ASJC Scopus subject areas

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

Cite this

Everett IV, T. H., Byrd, I., Wilson, E., Skoglund, J., & Olgin, J. (2008). Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram. In Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 (pp. 1733-1736). [4649511] (Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology").

Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram. / Everett IV, Thomas H.; Byrd, Israel; Wilson, Emily; Skoglund, Jamie; Olgin, Jeffrey.

Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. p. 1733-1736 4649511 (Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology").

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Everett IV, TH, Byrd, I, Wilson, E, Skoglund, J & Olgin, J 2008, Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram. in Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08., 4649511, Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology", pp. 1733-1736, 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08, Vancouver, BC, Canada, 8/20/08.
Everett IV TH, Byrd I, Wilson E, Skoglund J, Olgin J. Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram. In Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. p. 1733-1736. 4649511. (Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology").
Everett IV, Thomas H. ; Byrd, Israel ; Wilson, Emily ; Skoglund, Jamie ; Olgin, Jeffrey. / Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram. Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. pp. 1733-1736 (Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology").
@inproceedings{c0eb83e26d074dea8c89ee195233fc7c,
title = "Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram",
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.",
keywords = "Catheter ablation, Electrophysiology",
author = "{Everett IV}, {Thomas H.} and Israel Byrd and Emily Wilson and Jamie Skoglund and Jeffrey Olgin",
year = "2008",
month = "12",
day = "1",
language = "English (US)",
isbn = "9781424418152",
series = "Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - {"}Personalized Healthcare through Technology{"}",
pages = "1733--1736",
booktitle = "Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08",

}

TY - GEN

T1 - Phase angle shift is a better determinant for catheter electrode contact with tissue compared to a catheter sensed electrogram

AU - Everett IV, Thomas H.

AU - Byrd, Israel

AU - Wilson, Emily

AU - Skoglund, Jamie

AU - Olgin, Jeffrey

PY - 2008/12/1

Y1 - 2008/12/1

N2 - 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.

AB - 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.

KW - Catheter ablation

KW - Electrophysiology

UR - http://www.scopus.com/inward/record.url?scp=84903866464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84903866464&partnerID=8YFLogxK

M3 - Conference contribution

C2 - 19163014

AN - SCOPUS:84903866464

SN - 9781424418152

T3 - Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology"

SP - 1733

EP - 1736

BT - Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08

ER -