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QT dynamicity and sudden death after myocardial infarction: results of a long-term follow-up study

Philippe Chevalier1, Haran Burri, Patrice Adeleine

  • 1Hôpital Louis Pradel, Lyon, France. philippe.chevalier@chu-lyon.fr

Journal of Cardiovascular Electrophysiology
|April 29, 2003
PubMed

Insights

Impaired QT interval adaptation after myocardial infarction predicts sudden death. A higher diurnal QT/RR slope indicates increased risk, aiding in identifying patients needing antiarrhythmic prophylaxis.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Clinical Research

Background:

  • Acute myocardial infarction (MI) survivors face risks of sudden cardiac death.
  • Assessing long-term prognosis after MI is crucial for patient management.
  • Predictive markers for sudden death post-MI require further investigation.

Purpose of the Study:

  • To investigate if impaired QT interval adaptation to heart rate changes predicts sudden death in acute myocardial infarction patients.
  • To evaluate the prognostic value of QT dynamicity compared to other established markers.

Main Methods:

  • Prospective multicenter study (GREPI trial) involving 265 MI patients.
  • 24-hour Holter monitoring to calculate the diurnal QT/RR slope (QTe/RR).
  • Comparison of QTe/RR slope with ejection fraction, heart rate variability, and late potentials for predicting mortality.

Main Results:

  • Increased diurnal QTe/RR slope (>0.18) was the strongest independent predictor of sudden death.
  • Relative risk for sudden death with increased slope was 6.07 (CI 1.48-24.95, P=0.01).
  • Mean follow-up was 81 months, with 73 total deaths (23 sudden).

Conclusions:

  • Elevated diurnal QT/RR slope (QT dynamicity) independently predicts sudden death post-MI.
  • This simple parameter aids in risk stratification for MI patients.
  • May help identify patients who could benefit from antiarrhythmic prophylaxis.
Abstract

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