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Related Experiment Videos

Lessons learned from neutral ICD trials.

Seah Nisam1, Günter Breithardt

  • 1Guidant Corporation, Park Lane, Culliganlaan 2B, 1831 Diegem, Brussels, Belgium. snisam@guidant.com

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|May 4, 2006
PubMed
Summary
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Implantable cardioverter defibrillators (ICDs) reduce sudden cardiac death but not all-cause mortality in all patients. Certain patient groups, including those with low mortality risk or non-arrhythmic death causes, may not benefit from ICDs.

Area of Science:

  • Cardiology
  • Medical Devices
  • Clinical Trials

Background:

  • Implantable cardioverter defibrillators (ICDs) are established for reducing sudden cardiac death.
  • However, not all trials demonstrate improved survival with ICD therapy.

Purpose of the Study:

  • To identify patient subgroups unlikely to benefit from ICD implantation.
  • To analyze differences between positive and negative ICD trials.

Main Methods:

  • Comparative analysis of prospective randomized trials involving ICDs.
  • Evaluation of patient characteristics and mortality outcomes.

Main Results:

  • Four trials failed to show survival benefit from ICDs.
  • Patients with low 2-year mortality risk (<18%) are less likely to benefit.

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  • Patients with predominantly non-arrhythmic death mechanisms or those early post-infarction (within 6 weeks) may not benefit.

    • Conclusions:

    • ICD therapy is not universally beneficial for all patients.
    • Patient selection is crucial for optimizing outcomes with ICDs.
    • Understanding patient-specific risk factors can guide appropriate ICD implantation decisions.