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Effect of clopidogrel treatment on stress-induced platelet activation and myocardial ischemia in aspirin-treated patients with stable coronary artery disease.

Abstract：

:Stress may counteract responses to antiplatelet drug treatment. We investigated if adding clopidogrel to aspirin treatment could attenutate stress-induced platelet activation and myocardial ischemia in patients with coronary artery disease (CAD). Thirty-one male patients with documented CAD-treated with aspirin (75-160 mg daily) were randomized to co-treatment with clopidogrel (n = 16) or placebo (n = 15). A symptom-limited exercise test and 48-hour (h) Holter monitoring were performed before and after two weeks of double-blind treatment. Platelet function was assessed by flow cytometry and impedance aggregometry in whole blood. Exercise-induced and ambulatory ischemia was assessed from electrocardiographic (ECG) recordings. Clopidogrel treatment inhibited ADP-induced platelet P-selectin expression by 64% (22-87%), and attenuated the P-selectin response to thrombin (p < 0.001), and platelet aggregation induced by low-dose collagen (p < 0.01). Exercise ( approximately 110W) increased heart rate similarly, and caused approximately 1.8 mm ST-segment depression both before and after treatment. Exercise caused platelet activation, i.e. increased circulating activated single platelets and platelet-platelet aggregates, enhanced the in-vitro responsiveness to ADP or thrombin stimulation, and increased platelet-leukocyte aggregation. Clopidogrel inhibited ADP-induced platelet activation to a similar relative degree at rest and during exercise, but did not attenuate the platelet activating effect of exercise. Addition of clopidogrel to aspirin treatment did not attenuate either ambulatory or exercise-induced ischemia. In conclusion, adding clopidogrel to aspirin treatment inhibited platelet activation by both ADP, thrombin and collagen in vitro, but did not influence the prothrombotic responses to exercise. Intensified antiplatelet treatment did not reduce ECG signs of either exercise-induced or ambulatory myocardial ischemia.

journal_name

Thromb Haemost

journal_title

Thrombosis and haemostasis

authors

Perneby C,Wallén NH,Hofman-Bang C,Tornvall P,Ivert T,Li N,Hjemdahl P

doi

10.1160/th07-05-0323

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

1316-22

issue

6

eissn

0340-6245

issn

2567-689X

pii

07121316

journal_volume

98

pub_type

杂志文章,随机对照试验

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