NCT01248351

Reversibility of Dual Antiplatelet Therapy by Platelets

Reversibility of Dual Antiplatelet Therapy by Platelets.Phase II Study

• Status: Completed
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 6 (actual)
• Sponsor: Medical University of Graz · Academic / Other
• Sex: All
• Age: 18 Years – 30 Years
• Healthy volunteers: Accepted

Summary

The objective of the study is to test the hypothesis whether or not autologous stored platelets are able to offset the antiplatelet effect of aspirin and clopidogrel as assessed by state-of-the-art platelet function assays.

Detailed description

Dual antiplatelet therapy with aspirin and clopidogrel is a well established strategy to prevent thrombotic complications in patients with high platelet reactivity following plaque rupture in acute coronary syndromes (ACS) or percutaneous coronary interventions. Current practice guidelines for antiplatelet therapy advocate a one to 12 months dual antiplatelet therapy after bare metal stent PCI and a 12 months dual antiplatelet therapy after PCI in patients with ACS and drug eluting stent PCI. Although oral antiplatelet therapy is associated with both, short- as well as long-term clinical efficacy, irreversible platelet inhibition carries a substantial risk of bleeding particularly in patients presenting for surgery. Empiric therapy of bleeding consists of platelet transfusion. However, there are currently no pharmacodynamic studies assessing the effect of stored platelets on in-vitro platelet function tests. Healthy volunteers will donate platelets, take aspirin and clopidogrel for 3 days (loading dose aspirin 300 mg, clopidogrel 300 mg, maintenance dose aspirin 100 mg, clopidogrel 75 mg) and platelets will be retransfused on the 4th day. Pharmacodynamic measurements of platelet function will be performed at baseline, after drug intake before retransfusion, immediately after retransfusion and 24 hours thereafter.

Conditions

• Bleeding

Interventions

Type	Name	Description
OTHER	autologous stored platelets	Administration of autologous stored platelets
OTHER	administration of autologous stored platelets	administration of autologous stored platelets
BIOLOGICAL	autologous stored platelets	transfusion of autologous stored platelets

Timeline

• Start date: 2010-11-01
• Primary completion: 2011-02-01
• Completion: 2011-03-01
• First posted: 2010-11-25
• Last updated: 2011-04-28

Locations

1 site across 1 country: Austria