C-reactive protein, cardiovascular risk factors and the association with myocardial infarction in men

C J Doggen1, R J Berckmans, A Sturk

  • 1Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands.

Insights

High C-reactive protein levels are linked to myocardial infarction risk in men. However, this association is largely explained by other cardiovascular risk factors, suggesting it may not be causal.

Area of Science:

  • Cardiology
  • Biomarkers
  • Epidemiology

Background:

  • C-reactive protein (CRP) is an inflammatory marker.
  • Elevated CRP levels have been observed in patients with cardiovascular disease.

Purpose of the Study:

  • To investigate the association between C-reactive protein levels and myocardial infarction (MI) in men.
  • To examine the relationship between CRP and cardiovascular risk factors.
  • To adjust MI risk for these associated factors.

Main Methods:

  • A case-control study was conducted.
  • Included 560 male patients with a first myocardial infarction and 646 control subjects.

Main Results:

  • Patients with MI had significantly higher CRP levels than controls (2.2 vs. 1.7 mg L-1).
  • The highest CRP quintile showed an unadjusted 1.9-fold increased risk of MI.
  • After adjusting for cardiovascular risk factors (lipids, blood pressure, etc.), the MI risk for the highest CRP quintile decreased to 1.3-fold.

Conclusions:

  • CRP levels predict MI risk in men, confirming previous findings.
  • The observed association between CRP and MI risk is substantially attenuated when adjusted for other cardiovascular risk factors.
  • The increased risk of MI associated with CRP is likely not causal but mediated by other established risk factors.
Abstract

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