Effects of Low Molecular Weight Heparin Versus Dabigatran on Platelet Aggregation in Patients With Stable Coronary Artery Disease

Study Overview
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Brief Summary
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Anticoagulation with heparin is indicated in several situations, such as acute coronary disease (in combination with antiplatelet therapy) for the prevention and treatment of venous thromboembolism and situations with high risk of thromboembolism. Recently, the latest trials on anticoagulation for stroke prevention on atrial fibrillation have shown an increased risk for acute mycardial infarction on patients submitted to new oral anticoagulants, such as dabigatran. The mechanism is still unclear, however, in this context, some previous studies about interaction between anticoagulants ( mainly heparin) and platelet aggregation have shown conflicting results: while some suggest an inhibitory effect of heparin on platelet function, others suggest that heparin could promote an increase in platelet activation. The present study aims to assess the effects of the LMWH Enoxaparin and direct thrombin inhibitor, Dabigatran, on platelet aggregation, studied and compared by different methods in patients with chronic coronary artery disease (CAD).

Detailed Description
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This is a prospective and open study. We will include 29 patients with chronic CAD, stable, using ASA. All patients will receive the same medications in effective doses recommended at each stage of the study, so that every individual is his self-control, the Enoxaparin will be administrated at a dose of 1mg/kg twice a day and Dabigatran at a dose of 150mg twice a day. Study Design: Phase 1 : There will be a first collection of blood samples from all patients at baseline for laboratory tests, then the patient will receive Dabigatran for 5 days and laboratory tests including platelet aggregation will be made, among others. After a 30 days washout period, enoxaparin will be administrated for 5 days and in the 6st day, the same laboratory tests, including platelet aggregation, will be performed.

Official Title
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Effects of LMWH Versus Dabigatran on Platelet Aggregation in Patients With Stable Coronary Artery Disease

Conditions
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Coronary Disease

Intervention / Treatment
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* Drug: Dabigatran
* Drug: Enoxaparin


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age > 18 years old Coronary artery disease, defined as previous myocardial infarction and/or coronary angioplasty and/or Coronary Artery Bypass Graft (CABG) surgery and/or coronariography showing obstruction of at least 50 % in one of major epicardial vessels Treatment with Acetylsalicylic Acid (ASA) 100 mg/day Exclusion Criteria: Use in the last 7 days of oral anticoagulant or any other antiplatelet drug beside ASA Active bleeding Pregnancy or woman of childbearing age without contraceptive method Hemoglobin < 10 g/dL or hematocrit < 30 %, hematocrit > 50 %, platelets < 100.000/mm3 or > 500.000/mm3; creatinin clearance < 50 ml/minute Percutaneous coronary intervention (PCI) on the last 30 days before randomization (or PCI on the last year when drug-eluted stents are used); CABG surgery on the last 90 days; acute coronary syndrome on the last 60 days Active malignant neoplasm Active peptic ulcer disease on the last 60 days or upper gastrointestinal bleeding any time in life Refuse to participate in the study

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Dabigatran<br>Dabigatran 150mg twice a day for five days | Drug: Dabigatran<br>* Use for 5 days<br>* Other names: Pradaxa;|
| Active Comparator: Enoxaparin<br>Enoxaparin 1mg/kg/day twice a day for five days | Drug: Enoxaparin<br>* Use for 5 days<br>* Other names: Clexane;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from Baseline Platelet Aggregability | Comparing PLATELET AGGREGABILITY values through Multiplate test between patients on aspirin, assigned to the groups dabigatran and enoxaparin. | 5 days after starting the drug | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from Baseline Platelet Aggregability with other aggregability test | Comparing PLATELET AGGREGABILITY values through Verify Now test (units=ARU) between patients on aspirin assigned to the groups dabigatran and enoxaparin | 5 days after starting the drug | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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platelet function; dabigatran;enoxaparin