Purpose: High cholesterol content of erythrocyte membranes (CEM) levels is present in patients with acute coronary syndromes (ACS). Intraplaque hemorrhage and erythrocyte lysis contribute to the deposition of cholesterol on the atherosclerotic plaque and to plaque rupture. With the present study we assessed the effect of statin therapy on CEM levels, a novel marker of coronary artery disease (CAD) instability during a 1-year follow-up in CAD patients.
Methods: 212 consecutive eligible (158 men, 62 +/- 10 years) patients undergoing diagnostic coronary angiography for the assessment of angina pectoris were assessed. The study population comprised of 84 chronic stable angina (CSA) patients and 128 ACS patients. All study participants were commenced on statin treatment in equipotent doses and were followed for up to 1 year (at - 1, - 3, - 6 and - 12 months).
Results: Repeated measurements analysis of variance after appropriate adjustment showed a significant decrease (p < 0.001) in CEM content during follow up. CEM levels were decreasing at each time point (1 month : 100 microg/mg 95%CI 94.3-105.6, 3 months : 78.1 microg/mg 95%CI 73.2-83, 6 months : 67.2 microg/mg 95%CI 63.1-71.2, 1 year : 45.3 microg/mg 95%CI 42.2-48.3) compared to admission (112.1 microg/mg 95% CI 105.9-118.3) and to all previous measurements.
Conclusions: The present study showed, that use of statins is associated with a reduction in CEM, an emerging marker of clinical instability and plaque vulnerability in CAD patients. The pleiotropic effects of statins at the cell membrane level represent a promising novel direction for research in CAD.
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Statin use is associated with a significant reduction in cholesterol content of erythrocyte membranes. A novel pleiotropic effect?
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University Cardiology Department, Medical School, Democritus University of Thrace, Voulgaroktonou 23, 68100, Alexandroupolis, Greece.
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