Clopidogrel Resistance and the Possibility of Its Affection

Coronary Artery Disease Clinical Trial

Official title:

Resistance to Antiplatelet Agents, Its Etiology and the Possibility of Its Affection

Clinical Trial Details — Status: Temporarily not available

Administrative data

• NCT number: NCT00839345
• Other study ID #: CLO-OSM-01
• Status: Temporarily not available

Study information

• Verified date: January 2019
• Source: Charles University, Czech Republic
• Contact: n/a
• Is FDA regulated: No
• Study type: Expanded Access

Clinical Trial Summary

The purpose of the study is to determine, whether the resistance to clopidogrel could be affected by higher doses of this drug, or by replacement of clopidogrel with another ADP-antagonist ticlopidine.

Description:

Patients after percutaneous coronary intervention (PCI) with stent implantation have to be treated by dual antiplatelet therapy, which standard part represents clopidogrel. The response to clopidogrel in population exhibits wide interindividual variability. According to some recent works, patients with clopidogrel resistance are in higher risk for recurrence of myocardial infarction in comparison with the patients with sufficient clopidogrel effectiveness. The treatment of clopidogrel resistance is still unknown. Our project should contribute to the better understanding of the clinical impact of clopidogrel resistance and its genetical determination. We will test the hypothesis, whether the clopidogrel resistance could be influenced by higher dose of this drug or by replacement to ticlopidine (ADP antagonist with different biotransformation in the liver). Therefore, 500 pts. will be tested to clopidogrel resistance. We expect 5-10% of resistent pts. This pts. will be treated by higher dose (150mg or 225mg/day) with repeated tests of clopidogrel effectiveness after each dose enhancement. If 225mg/day will be insufficient, clopidogrel will be replaced by ticlopidine with repeated test. We expect, that better definition of clinical and and genetic correlate of clopidogrel resistance will improve our knowledge of this disorder. Nevertheless, the achievement of sufficient effect of clopidogrel in some still resistant patients will lead to the improvement of the treatment

Recruitment information / eligibility

• Status: Temporarily not available
• Enrollment: 0
• Gender: All
• Age group: 18 Years to 90 Years

Eligibility

Inclusion Criteria:

• written informed consent

• coronary artery disease verified by coronary angiography

• percutaneous coronary intervention with stent implantation

• standard indication for dual antiplatelet therapy

Exclusion Criteria:

• scheduled surgical revascularization by aortocoronary bypass

• insufficient cooperation of the patient

• coagulopathy in history with a higher risk of bleeding

• life expectancy shorter than 1 year

• severe anemia with hemoglobin level< 10,0 g/dl

• platelet count < 100,000)

Related Conditions & MeSH terms

• Coronary Artery Disease
• Coronary Disease
• Myocardial Ischemia

Intervention

Drug:
• clopidogrel
The intervention will involve the change of dosage or change of drug. The traditional maintenance dose of clopidogrel is 75 mg per day. We will test in non-responders to this classical dose higher doses up to 225mg per day. In patients,who will not respond to this 3times higher dose,clopidogrel will be replaced by ticlopidine.

Locations

Country	Name	City	State
Czechia	Cardiocenter, Dept. Of Cardiology, Charles University Hospital	Prague

Sponsors (1)

Lead Sponsor	Collaborator
Charles University, Czech Republic

Country where clinical trial is conducted

Czechia,