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Europace Advance Access originally published online on May 1, 2008
Europace 2008 10(6):726-728; doi:10.1093/europace/eun113
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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

ICDs

Inappropriate implantable cardioverter defibrillator shocks in fractured Sprint Fidelis leads associated with ‘appropriate’ interrogation

David Farwell*, Calum Redpath, David Birnie, Michael Gollob, Robert Lemery, Emoke Posan and Martin Green

University of Ottawa Heart Institute, Canada

We present two patients with fractures within the pace–sense circuit of their Medtronic Sprint Fidelis leads who received inappropriate shocks from their Medtronic defibrillators during device interrogation. This was not simply a coincidence, but due to electromagnetic interference induced within the Sprint Fidelis lead by the device programmer during two-way communication with the defibrillator. Our subsequent investigations have uncovered at least two other similar incidents in Canada. We have also discovered that the Medtronic ‘Auto-resume’ feature may leave future patients uniquely vulnerable to such inappropriate shocks in the future.

Key Words: Implantable cardioverter defibrillator, Implantable cardioverter defibrillator lead, Inappropriate shocks, Electromagnetic interference

* Corresponding author. Tel: +1 6138824670.E-mail address: djfarwell{at}bigfoot.com

Manuscript submitted 27 March 2008. Accepted after revision 31 March 2008.


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