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Hyperlipidemia and coronary disease. Correction of the increased thrombogenic potential with cholesterol reduction.

Abstract：

BACKGROUND:Hypercholesterolemia is a risk factor for coronary disease, and platelet reactivity is increased with hypercholesterolemia, suggesting a prethrombotic risk. The aim of this study was to measure mural platelet thrombus formation on an injured arterial wall in a model simulating vessel stenosis and plaque rupture in hypercholesterolemic coronary disease patients before and after cholesterol reduction. METHODS AND RESULTS:Thirty-two patients with stable coronary disease were studied. Platelet thrombus formation and serum lipids were measured in 16 hypercholesterolemic patients (cholesterol > 5.2 mmol/L) before and after a mean of 2.5 months of pravastatin therapy (40 mg/d) and in 16 normocholesterolemic control patients. Thrombus formation was assessed by exposing porcine aortic media to the patient's flowing venous blood for 3 minutes at a shear rate of 754 or 2546 s-1 at 37 degrees C in an ex vivo superfusion chamber. Quantitative morphometric platelet thrombus formation at baseline was higher in the hypercholesterolemic patients at both the high and low shear rates: 4.8 +/- 1.0 and 3.3 +/- 0.7 micron 2/mm, respectively, compared with normocholesterolemic patients: 2.1 +/- 0.5 and 1.6 +/- 0.4 micron 2/mm (both P < .05). In the hypercholesterolemic patients, pravastatin decreased total cholesterol from 6.5 +/- 0.2 to 4.5 +/- 0.2 mmol/L and LDL cholesterol from 4.5 +/- 0.2 to 2.8 +/- 0.1 mmol/L (both P < .05). Platelet thrombus formation at high and low shear rates decreased to 2.0 +/- 0.3 and 1.3 +/- 0.3 micron 2/mm, respectively (both P < .05). CONCLUSIONS:Thus, hypercholesterolemia is associated with an enhanced platelet thrombus formation on an injured artery, increasing the propensity for acute thrombosis. Platelet thrombus formation at both high and low shear rates decreased as total and LDL cholesterol levels were reduced with pravastatin. Cholesterol lowering may therefore reduce the risk of acute coronary events in part by reducing the thrombogenic risk.

journal_name

Circulation

journal_title

Circulation

authors

Lacoste L,Lam JY,Hung J,Letchacovski G,Solymoss CB,Waters D

doi

10.1161/01.cir.92.11.3172

subject

Has Abstract

pub_date

1995-12-01 00:00:00

pages

3172-7

issue

11

eissn

0009-7322

issn

1524-4539

journal_volume

92

pub_type

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