An esophageal probe for measuring three-dimensional electric fields during external cardiac defibrillation

David A. Fitch, Amy Curry

Research output: Contribution to journalArticle

Abstract

External defibrillation is a common treatment for the cardiac arrhythmia atrial fibrillation. Electrode placement has been shown to affect defibrillation efficacy and required energy levels. We suggest investigating the relationship between esophageal electric fields (EEFs) and atrial defibrillation thresholds to determine the feasibility of creating patient-specific electrode placements using EEFs. This study presents the design and implementation of an esophageal probe (EP) that accurately measures three-dimensional electric fields. The root-mean-square error of the EP was 1.69% as determined by measurements performed in an electrolytic tank. The EP also performed well during in vivo testing in a pig. There was a strong positive relationship between EEF 2s and applied energy during defibrillation strength shocks. The EEF measurements were also repeatable, with less than 4.24% difference between repeated shocks. This is the first description of a probe designed specifically for measuring electric fields in the esophagus.

Original languageEnglish (US)
Pages (from-to)535-543
Number of pages9
JournalPhysiological Measurement
Volume33
Issue number3
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

Fingerprint

Shock
Electrodes
Electric fields
Atrial Fibrillation
Esophagus
Cardiac Arrhythmias
Swine
Electrolytic tanks
Electric field measurement
Mean square error
Electron energy levels
Therapeutics
Testing

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Physiology
  • Biomedical Engineering
  • Physiology (medical)

Cite this

An esophageal probe for measuring three-dimensional electric fields during external cardiac defibrillation. / Fitch, David A.; Curry, Amy.

In: Physiological Measurement, Vol. 33, No. 3, 01.03.2012, p. 535-543.

Research output: Contribution to journalArticle

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