Stent thrombosis is associated with an impaired response to antiplatelet therapy

Wenaweser, Peter; Dörffler-Melly, Janine; Imboden, Katja; Windecker, Stephan; Togni, Mario; Meier, Bernhard; Haeberli, Andre; Hess, Otto M (2005). Stent thrombosis is associated with an impaired response to antiplatelet therapy. Journal of the American College of Cardiology, 45(11), pp. 1748-52. New York, N.Y.: Elsevier 10.1016/j.jacc.2005.01.058

Full text not available from this repository.

OBJECTIVES: We sought to evaluate the response to antiplatelet therapy in patients with stent thrombosis (ST). BACKGROUND: Stent thrombosis is associated with considerable morbidity and mortality. An impaired response to antiplatelet therapy might be related to an increased risk for ST. METHODS: Eighty-two patients were included in the present study: 23 patients with previous ST, 50 matched controls (coronary stenting without ST), and 9 healthy volunteers. Platelet aggregation (PA) was studied (optical aggregometry) under monotherapy with acetylsalicylic acid (ASA) 100 mg daily for one month, followed by dual therapy with ASA 100 mg and clopidogrel 75 mg daily (loading dose 300 mg) for another month. RESULTS: Maximal (5 and 20 micromol) adenosine diphosphate-induced PA was significantly higher in patients with ST compared with controls (5 micromol, p < 0.005; 20 micromol, p < 0.05) and volunteers (5 micromol, p < 0.005; 20 micromol, p < 0.05). Resistance to ASA (>20% aggregation with 0.5 mg/ml arachidonic acid) was more prevalent in patients with ST (48%) compared with control patients (32%, p = ns) and volunteers (0%, p = 0.01). Clopidogrel significantly reduced PA in all three groups, but intergroup differences persisted. Clopidogrel resistance (<10% relative change) was similar in patients with ST, control patients, and volunteers (4%, 6%, and 11%, respectively, all p = NS). However, combined ASA and clopidogrel resistance was more prevalent in patients with ST (52%) compared with controls (38%, p = NS) and volunteers (11%, p < 0.05). CONCLUSIONS: Patients with previous ST show an impaired response to antiplatelet therapy with ASA compared with controls and volunteers. Additional treatment with clopidogrel is not able to overcome these differences in PA. Acetylsalicylic acid but not clopidogrel resistance appears to be associated with ST.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Thromboselabor Kinderklinik [discontinued]
UniBE Contributor:	Häberli, André
ISSN:	0735-1097
Publisher:	Elsevier
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:12
Last Modified:	02 Mar 2023 23:23
Publisher DOI:	10.1016/j.jacc.2005.01.058
PubMed ID:	15936599
Web of Science ID:	000229593000002
URI:	https://boris.unibe.ch/id/eprint/31665 (FactScience: 196313)