Pacemaker malfunction due to mechanical failure of the lead-header interface

Amanda E Coleman, Teresa C Defrancesco, Guillaume Chanoit

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)


An 8 year old female spayed Boxer dog, diagnosed with concurrent vasovagal syncope and arrhythmogenic right ventricular cardiomyopathy, presented for routine evaluation approximately three months following epicardial pacemaker implantation. Routine device interrogation revealed intermittent loss of ventricular capture and intermittent failure to appropriately sense. Following evaluation of chronic impedance data, failure of the pacemaker lead-header interface or lead conductor fracture was suspected. Radiographic and pacemaker interrogator findings suggested incomplete lead insertion into the device header with intermittent loss of ventricular capture and variable pacemaker sensing. We hypothesize that either the presence of a loose or cross-threaded set screw or operator error at the time of device implantation may have caused this complication. This report details the diagnosis of mechanical failure of the lead-header interface, a complication not previously reported in a veterinary patient.
Original languageEnglish
Pages (from-to)519-23
Number of pages5
JournalJournal of Veterinary Cardiology
Issue number4
Publication statusPublished - Dec 2012

Bibliographical note

Copyright © 2012 Elsevier B.V. All rights reserved.


  • Animals
  • Dog Diseases
  • Dogs
  • Electrodes, Implanted
  • Equipment Failure
  • Female
  • Pacemaker, Artificial


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