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MADIT-II: clinical implications.

Arthur J Moss1, James Daubert, Wojciech Zareba

  • 1Cardiology Unit, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA. heartajm@heart.rochester.edu

Cardiac Electrophysiology Review
|November 20, 2002
PubMed
Summary
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Prophylactic defibrillator implantation significantly improves survival in patients with low ejection fraction after myocardial infarction. Electrophysiologic testing may not reliably predict device use for specific arrhythmias in this population.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Clinical Trials

Background:

  • Patients with prior myocardial infarction and reduced ejection fraction (<=0.30) are at high risk for sudden cardiac death.
  • The Multicenter Automatic Defibrillator Implantation Trial II (MADIT-II) investigated the benefit of prophylactic implantable cardioverter-defibrillator (ICD) therapy in this population.

Purpose of the Study:

  • To evaluate the impact of prophylactic ICD implantation on survival in patients with advanced left ventricular dysfunction post-myocardial infarction.
  • To assess the role of electrophysiologic (EP) testing in risk stratification and prediction of ICD utilization in this patient group.

Main Methods:

  • Analysis of data from the MADIT-II trial, focusing on patients with ejection fraction <=0.30.
  • Correlation of baseline electrophysiologic inducibility with long-term ICD utilization for specific ventricular arrhythmias (ventricular tachycardia and ventricular fibrillation).

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Main Results:

  • Prophylactic ICD implantation demonstrated a significant survival benefit, reducing mortality by 31% over a mean follow-up of 20 months.
  • Electrophysiologic testing was positive in 36% of patients at the time of ICD implantation.
  • Inducibility was linked to higher ICD use for ventricular tachycardia but lower use for ventricular fibrillation during follow-up.

Conclusions:

  • Prophylactic ICD implantation is effective in improving survival for high-risk patients with prior myocardial infarction and low ejection fraction.
  • The clinical utility of electrophysiologic testing as a sole risk stratifier for predicting ICD interventions in advanced left ventricular dysfunction warrants further investigation.