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Europace Advance Access originally published online on December 24, 2008
Europace 2009 11(3):374-375; doi:10.1093/europace/eun343
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Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2008. For permissions please email: journals.permissions@oxfordjournals.org

SHORT COMMUNICATIONS

Defibrillator shock due to ventricular trigeminy

Krishnakumar Nair, Raja Selvaraj and Vijay S. Chauhan*

Division of Cardiology, University Health Network, Toronto, ON, Canada

A 56-year-old lady with arrhythmogenic right ventricular cardiomyopathy had a shock for ventricular trigeminy. The device diagnosed this as ventricular fibrillation because of its binning algorithm, which does not use a consecutive, or a proportional counter. A beat is binned as a fibrillation beat only if the current cycle length is in the fibrillation zone and the running average of the previous four cycle lengths are in the fibrillation or ventricular tachycardia zone. Reprogramming the device into a single detection zone will help prevent shocks in this situation.

* Corresponding author: Peter Munk Cardiac Center, 3-522 Toronto General Hospital, 150 Gerrard Street W., Toronto, Ontario, Canada M5G 2C4. Tel: +416 340 3172; Fax: +416 340 4710, Email: vijay.chauhan{at}uhn.on.ca

Manuscript submitted 22 September 2008. Accepted after revision 17 November 2008.


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