Platelet Reactivity in Stent Thrombosis Patients (MAPCAT)
The MAgnitude of Platelet Inhibition and the Pharmacokinetics of a 600 mg Loading Dose of Clopidogrel, in Different Patient CATegories (Stable Angina Versus Acute-coronary Syndromes Versus ST-elevated Myocardial Infarction).
調査の概要
詳細な説明
Objectives:
The first objective of the MAPCAT-study is to investigate whether plasma pharmacokinetics (Cmax, Tmax and AUC) of an additional 600 mg loading dose are impaired in patients with a history of stent thrombosis.
The second objective of the MAPCAT study is to investigate whether genetic polymorphisms in receptors, enzymes and ligands involved in the process of thrombosis and haemostasis as well in the conversion-process of clopidogrel into its metabolites do have influence on both the absolute magnitude of platelet inhibition and Cmax, Tmax and AUC.
研究の種類
入学 (実際)
段階
- フェーズ 4
連絡先と場所
研究場所
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Utrecht
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Nieuwegein、Utrecht、オランダ、3435CM
- St Antonius hospital
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- Patients with a history of a stent thrombosis in the period 2004-2008.
Exclusion Criteria:
- Persistent acute ST-segment elevation
- Successful revascularization during the qualifying hospitalization, prior to study entry
- Acute pulmonary edema, hypotension, or evidence of cardiogenic shock
- Clinically significant liver disease
- End stage kidney disease requiring dialysis
- Use at study entry of drugs that are strong inhibitors of cytochrome P450 3A4 and CYP3A5 (i.e. clarithromycin, erythromycin, itraconazole, ketoconazole)
- Contraindications to antithrombotic/antiplatelet therapy
- Failed coronary intervention in the previous 2 weeks
- Malignancies
- Increased risk of bleeding (previous stroke in the past months, active bleeding or bleeding diathesis, recent trauma or major surgery in the last month, suspected aortic dissection, oral anticoagulation therapy with coumarin derivate within 7 days, recent use of GPIIb/IIIa inhibitors within 14 days, severe uncontrolled hypertension >180 mmHg unresponsive to therapy)
- Relevant hematologic deviations (haemoglobin <100g/L (6,2 mmol/L) or hematocrit <34%, platelet count <100 x 109 /L or platelet count > 600 x 109/L)
- Known allergy to clopidogrel
- Pregnancy (present or suspected)
- uncontrolled hypertension at time of randomization
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:診断
- 割り当て:非ランダム化
- 介入モデル:単一グループの割り当て
- マスキング:なし(オープンラベル)
武器と介入
参加者グループ / アーム |
介入・治療 |
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アクティブコンパレータ:stent thrombosis patients
Patients with a history of a stent thrombosis
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both arms of the study (patients with a history of stent thrombosis as well as patients who did not suffer from a stent thrombosis) will be given a 600 mg loading dose of clopidogrel
他の名前:
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アクティブコンパレータ:Patients without a history of a stent thrombosis
Patients without a history of stent thrombosis
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both arms of the study (patients with a history of stent thrombosis as well as patients who did not suffer from a stent thrombosis) will be given a 600 mg loading dose of clopidogrel
他の名前:
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この研究は何を測定していますか?
主要な結果の測定
結果測定 |
時間枠 |
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Plasma concentrations of unchanged clopidogrel, its active thiol metabolite and its inactive carboxyl metabolite between the different patient groups after the administration of a 600 mg loading dose of clopidogrel.
時間枠:6 hours after the administration of a 600mg loading dose of clopidogrel
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6 hours after the administration of a 600mg loading dose of clopidogrel
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二次結果の測定
結果測定 |
時間枠 |
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The magnitude of platelet reactivity as measured with several commercial available platelet function tests before and 6 hours after the ingestion of the loading dose.
時間枠:platelet reactivity measured at baseline and 6 hours after a 600 mg clopidogrel loading dose.
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platelet reactivity measured at baseline and 6 hours after a 600 mg clopidogrel loading dose.
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Exploratory Endpoint: prevalence of various genetic polymorphisms that might influence the pharmacokinetics of clopidogrel
時間枠:blood obtained for genetic sampeling at timepoint of first study blood collection
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blood obtained for genetic sampeling at timepoint of first study blood collection
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協力者と研究者
スポンサー
捜査官
- 主任研究者:J.M. ten Berg, MD, PhD、St Antonius center for platelet function research
出版物と役立つリンク
一般刊行物
- van Werkum JW, Heestermans AA, Zomer AC, Kelder JC, Suttorp MJ, Rensing BJ, Koolen JJ, Brueren BR, Dambrink JH, Hautvast RW, Verheugt FW, ten Berg JM. Predictors of coronary stent thrombosis: the Dutch Stent Thrombosis Registry. J Am Coll Cardiol. 2009 Apr 21;53(16):1399-409. doi: 10.1016/j.jacc.2008.12.055.
- Elsenberg EH, van Werkum JW, van de Wal RM, Zomer AC, Bouman HJ, Verheugt FW, Berg JM, Hackeng CM. The influence of clinical characteristics, laboratory and inflammatory markers on 'high on-treatment platelet reactivity' as measured with different platelet function tests. Thromb Haemost. 2009 Oct;102(4):719-27. doi: 10.1160/TH09-05-0285.
- Taubert D, Bouman HJ, van Werkum JW. Cytochrome P-450 polymorphisms and response to clopidogrel. N Engl J Med. 2009 May 21;360(21):2249-50; author reply 2251. doi: 10.1056/NEJMc090391. No abstract available.
- Heestermans AA, van Werkum JW, Schomig E, ten Berg JM, Taubert D. Clopidogrel resistance caused by a failure to metabolize clopidogrel into its metabolites. J Thromb Haemost. 2006 May;4(5):1143-5. doi: 10.1111/j.1538-7836.2006.01891.x. No abstract available.
- Taubert D, von Beckerath N, Grimberg G, Lazar A, Jung N, Goeser T, Kastrati A, Schomig A, Schomig E. Impact of P-glycoprotein on clopidogrel absorption. Clin Pharmacol Ther. 2006 Nov;80(5):486-501. doi: 10.1016/j.clpt.2006.07.007.
- Bouman HJ, van Werkum JW, Breet NJ, ten Cate H, Hackeng CM, ten Berg JM. A case-control study on platelet reactivity in patients with coronary stent thrombosis. J Thromb Haemost. 2011 May;9(5):909-16. doi: 10.1111/j.1538-7836.2011.04255.x.
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (見積もり)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
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