The Effect of Clopidogrel and Ticagrelor With and Without Acetylsalicylic Acid (ASA) on Hemostatic System Activation at the Site of Plug Formation in Vivo in Man

Medical University of Vienna

Status and phase: Completed; Phase 2

Conditions: Acute Coronary Syndrome

Treatments: Drug: ASA; Drug: Ticagrelor; Drug: Placebo; Drug: Clopidogrel

Study type: Interventional

Funder types: Other

Identifiers

NCT02120092

ClopidogrelTicagrelorASA

Details and patient eligibility

About

Background: Coronary heart disease is the most common cause of death in industrialized countries. Revascularisation by percutaneous coronary angioplasty or thrombolysis is the main principle for treatment of the acute coronary syndrome. To inhibit platelet activity patients are routinely given acetylsalicylic acid (ASA) and clopidogrel, a second-generation thienopyridine. Recently, ticagrelor, a novel cyclopentyl-triazolo-pyrimidine with several pharmacological advantages, has demonstrated greater efficacy but a higher bleeding risk than clopidogrel. Coronary thrombus formation is a complex process and the antithrombotic mechanisms of platelet function inhibitors are incompletely understood. Studies in venous blood or in vitro do not truly reflect the in vivo circumstances as they often do not take into account flow conditions or the interaction between endothelium, blood cells and coagulation factors. Results from animal models may not be relevant for the prothrombotic mechanisms in humans. We have developed a technique that allows investigating hemostatic system activation directly at the site of thrombus formation in vivo in humans.

Aim: to compare the inhibitory effects of clopidogrel and ticagrelor (with and without concomitant ASA) on hemostatic system activation under circumstances close to the in vivo situation.

Design, patients and interventions: prospective, randomized, double-blind, placebo controlled parallel-group study with a 2x2 factorial design including 112 healthy volunteers who will be randomised to 4 treatment arms: ticagrelor or clopidogrel + placebo, ticagrelor or clopidogrel + ASA.

Outcome variables: Indicators of platelet and coagulation activation [ß-thromboglobulin and thromboxane B2 as well as prothrombin fragment F1+2 and D-Dimer, respectively] will be measured before and at several time points during a 8 day period in venous blood and in blood emerging from a standardized injury of the microvasculature to determine bleeding time (shed blood).

Statistical considerations: Sample size calculation is based on the percent change in the main outcome variable "β-TG in shed blood" from baseline to 2 hours after treatment start. Statistical analysis is based on the full analysis set, including all randomized subjects who received at least the starting dose of the study medication and for whom blood collections at baseline and at 2 hours after treatment start have been performed.

Enrollment: 89 patients

Sex: Male

Ages: 19 to 50 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• young, healthy males

Exclusion criteria

• history of bleeding
• any medication
• known intolerance to study drug(s)

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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89 participants in 4 patient groups, including a placebo group

Clopidogrel + ASA

Active Comparator group

Treatment:

Drug: ASA

Drug: Clopidogrel

Clopidogrel + Placebo

Placebo Comparator group

Treatment:

Drug: Clopidogrel

Drug: Placebo

Ticagrelor + ASA

Active Comparator group

Treatment:

Drug: Ticagrelor

Drug: ASA

Ticagrelor + Placebo

Placebo Comparator group

Treatment:

Drug: Ticagrelor

Drug: Placebo