Dynamic Changes in Intracardiac Resistance as a Predictive Marker during Internal Cardioversion of Atrial Fibrillation.

PR Walsh, OJ Escalona, Vivek Kodoth, NC Castro, David McEneaney, Ernest Lau, Ganesh Manoharan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)


Intracardiac resistance (ICR) is an important determinant of treatment success during internalcardioversion of atrial fibrillation (AF). However, there is limited data on dynamic changes in ICR as a predictor of cardioversion outcome. In this retrospective study, thirty patients with persistent AF were randomised to treatment with a biphasic or monophasic energy step-up cardioversion protocol (50V-to-300V in 50V steps). ICR was computed for each patient and a student t-test used to investigate the significance of dynamic changes in ICR between successive shocks delivered. For both biphasic and monophasic waveforms, all patients who cardioverted exhibited a significant reduction in ICR between the first and third shock (p0.05 for both waveforms). A statistically significant decrease in ICR during the first three shocks wasidentified as a predictive marker for successful cardioversion outcome.
Original languageEnglish
Title of host publicationUnknown Host Publication
PublisherIEEE Xplore
Number of pages4
ISBN (Print)978-1-4799-0884-4
Publication statusPublished (in print/issue) - 29 Dec 2013
EventComputing in Cardiology (CinC), 2013 - Zaragoza, Spain
Duration: 29 Dec 2013 → …


ConferenceComputing in Cardiology (CinC), 2013
Period29/12/13 → …
Internet address


  • Intracardiac resistance variation
  • low-tilt waveform
  • AF cardioversion
  • step-up defibrillation protocol
  • monophasic waveform
  • biphasic defibrillation
  • RF defibrillator
  • bio-impedance.


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