Lessons Learned from Implantable Cardioverter-Defibrillators Recordings

  • Jeff Gillberg
  • Troy Jackson
  • Paul Ziegler

The diagnostic capability of the implantable cardioverter-defibrillator (ICD) has undergone substantial changes since the first devices were designed in the 1980s. The earliest ICDs provided only counters to confirm the number of shocks delivered and had no diagnostics that could be used to confirm the ventricular rate or rhythm of treated episodes.1 The availability of simple diagnostic information, such as ventricular rate and patterns of ventricular intervals, in the few seconds surrounding delivered therapy was a major step forward in providing information necessary to understand the nature of the rhythms being treated. However, the addition of stored cardiac electrogram (EGM) signals to complement and confirm ventricular rate and interval pattern information has been the crucial advance that has allowed clinicians, scientists, and engineers to confirm appropriate ICD function and to improve their understanding of the cardiac rhythms treated by ICDs in the ambulatory setting.


Ventricular Tachycardia Sudden Cardiac Death Right Ventricle Superior Vena Cava Ventricular Tachyarrhythmia 


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Copyright information

© Springer Science+Business Media, LLC. 2009

Authors and Affiliations

  • Jeff Gillberg
    • 1
  • Troy Jackson
    • 1
  • Paul Ziegler
    • 1
  1. 1.CRDM Research, Medtronic, Inc.MinneapolisUSA

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