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Pretreatment with oral anticoagulants decreases platelet activation in patients before and after percutaneous coronary intervention.

Abstract：

BACKGROUND:Platelet activation plays a major role in acute vessel closure after coronary angioplasty. In the randomized Balloon Angioplasty and Anticoagulation Study (BAAS), pretreatment with oral anticoagulants in addition to aspirin resulted in a 47% reduction of acute complications as compared with aspirin alone. This result may suggest a direct effect of oral anticoagulants on platelet activation. METHODS AND RESULTS:Patients were randomized to aspirin alone (group A, n = 26) or to aspirin plus oral anticoagulants started one week before angioplasty (group B, n = 26). Platelet response tests were performed 1 hour before (baseline) and 1 hour after intervention and on day 1. Platelet activation was measured by flow cytometry, as the number of antibody-positive platelets per 10,000 counted. Platelet function was evaluated with use of the PFA-100 analyzer. In group B, the median number of P-selectin-positive platelets was lower before (28 vs. 54, P = 0.018) and after (13 vs. 24, P = 0.377) angioplasty than in group A. Also the median decrease in the number of P-selectin-positive platelets during angioplasty was lower in group B (delta = 4) than in group A (delta = 30, P = 0.022). No further significant change was observed in platelet activation on day 1 in the two groups. The ability of platelets to become stimulated as measured with the PFA-100 analyzer was not affected by oral anticoagulants. CONCLUSIONS:Pretreatment with oral anticoagulants resulted in less activated platelets before and after coronary angioplasty, which is in agreement with its clinical effect of reducing procedural complications. Platelet function was not affected by oral anticoagulants.

journal_name

Thromb Haemost

journal_title

Thrombosis and haemostasis

authors

ten Berg JM,Gerritsen WB,Haas FJ,Kelder JC,Verheugt FW,Thijs Plokker HW

keywords:

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

924-30

issue

6

eissn

0340-6245

issn

2567-689X

pii

02120924

journal_volume

88

pub_type

临床试验,杂志文章,随机对照试验

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