Atherosclerotic risk genotypes and recurrent coronary events after myocardial infarction

Am J Cardiol. 2005 Jul 15;96(2):177-82. doi: 10.1016/j.amjcard.2005.03.039.

Abstract

The association of a group of prespecified atherosclerotic risk genotypes with recurrent coronary events (coronary-related death, nonfatal myocardial infarction, or unstable angina) was investigated in a cohort of 1,008 patients after infarction during an average follow-up of 28 months. We used a carrier-ship approach with time-dependent survivorship analysis to evaluate the average risk of each carried genotype. Contrary to expectation, the hazard ratio for recurrent coronary events per carried versus noncarried genotype was 0.89 (95% confidence interval 0.80 to 0.99, p = 0.03) after adjustment for relevant genetic, clinical, and environmental covariates. This hazard ratio, derived from the 7 prespecified genotypes, indicated an average 11% reduction in the risk of recurrent coronary events per carried versus noncarried genotype. At 1 year after hospital discharge, the cumulative probability of recurrent coronary events was 26% in those who carried < or =1, 20% for those with 2 to 4, and 13% for those with > or =5 of these genotypes (p = 0.02). This unexpected risk reversal is a likely consequence of changes in the mix of risk factors in pre- and postinfarction populations. In conclusion, this under appreciated, population-based, risk-reversal phenomenon may explain the inconsistent associations of genetic risk factors with outcome events in previous reports involving coronary populations with different risk attributes.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Angina, Unstable / diagnosis
  • Angina, Unstable / epidemiology
  • Angina, Unstable / genetics*
  • Cohort Studies
  • Coronary Artery Disease / diagnosis
  • Coronary Artery Disease / epidemiology
  • Coronary Artery Disease / genetics*
  • Female
  • Follow-Up Studies
  • Genetic Predisposition to Disease*
  • Genetic Testing / methods
  • Genotype
  • Humans
  • Male
  • Middle Aged
  • Multicenter Studies as Topic
  • Myocardial Infarction / diagnosis
  • Myocardial Infarction / epidemiology
  • Myocardial Infarction / genetics*
  • Probability
  • Proportional Hazards Models
  • Prospective Studies
  • Recurrence
  • Risk Assessment
  • Severity of Illness Index
  • Survival Analysis