Endothelium, Stenting, and Antiplatelet Therapy (EST) - Clopidogrel, Prasugrel, Ticagrelor Study (EST)

September 4, 2016 updated by: Tommaso Gori, Johannes Gutenberg University Mainz

Effects of Clopidogrel vs Prasugel vs Ticagrelor on Endothelial Function, Inflammatory and Oxidative Stress Parameters and Platelet Function in Patients Undergoing Coronary Artery Stenting. A Randomised, Prospective Study.

Endothelial dysfunction is an important predictor - and a determinant - of adverse clinical outcome. Endothelial function is impaired by coronary artery stenting, a stud from our group has shown that it can be improved by platelet inhibition using clopidogrel. However, clopidogrel unresponsiveness is a known problem, and it has been show that the endothelial effects of clopidogrel tend to wane upon prolonged treatment. Whether a more effective anti-platelet therapy is able to prevent/improve not only thrombotic events but also endothelial dysfunction, with potential positive impact on clinical outcome in patients undergoing coronary artery stenting, is an important hypothesis that needs to be further investigated. To date, evidence regarding "ancillary" (non-platelet-dependent) effects of antiaggregant drugs is very limited. For instance, while their antiplatelet effects, and their beneficial effects in patients with acute coronary syndromes, have been clearly demonstrated in multicentric trials, it remains to be shown whether these drugs also protect endothelial function. Interestingly, some authors suggest that the mortality benefit observed in the PLATO study is at least in part independent of direct antiplatelet effects. No study, to date, has tested the effects of prasugrel and/or ticagrelor on endothelial function. With the present trial, the investigators plan to test the effect of clopidogrel, prasugrel and ticagrelor on endothelial function before and up to 4 weeks after coronary artery stenting. This study will provide important pathophysiologic insight on the relationship between platelet aggregation and endothelial function, two parameters that have been shown to influence patients' prognosis.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
126

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Germany
      • Mainz, Germany, 55131
        • 2 Medical Clinic

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • - 18-75 years old consecutive patients undergoing coronary angiography and stenting at the University Medical Centre Mainz
  • A coronary lesion (and patient) amenable to treatment with drug eluting stent
  • Ability of subject to understand character and individual consequences of clinical trial
  • Signed and dated informed consent of the subject must be available before start of any specific trial procedures.
  • Negative pregnancy test of women with childbearing potential

Exclusion Criteria:

  • Subjects presenting 1 or more of the following criteria will not be enrolled in the trial:
  • Patients with elevated (> 5 times upper normal limit) C-reactive protein level prior to stenting
  • Patients in whom therapy with long-acting nitrates cannot be suspended prior to endothelial function measurements
  • An acute coronary syndrome treated with coronary stenting within the last 4 weeks
  • Patients with known inflammatory/infective diseases
  • Patients with severe extracardiac diseases limiting life expectancy
  • Known heart failure (LV-EF ≤ 40% AND NYHA III-IV)
  • PCI or coronary By-Pass surgery within the last 4 weeks, pre-existing ongoing treatment with any of the study treatments.
  • History of cerebrovascular events (stroke)
  • Known renal dysfunction (serum creatinine ≥ 1.8mg/dl in women, ≥ 2.0mg/dl in men)
  • Serum potassium > 5.5mmol/l
  • Known hepatic impairment (AST, ALT > 3 times upper limit of normal)
  • Changes in the ß-blocker, statin or ACE or angiotensin-receptor blocker inhibitor treatment within the past 2 weeks
  • Pregnancy and lactation, inadequate contraception
  • Body weight < 60kg
  • Active bleeding
  • Therapy with CYP3A4 inhibitors (ketoconazole, protease inhibitors, macrolide antibiotics)
  • Therapy with anticoagulants: phenprocoumone, warfarin, dabigatran, rivaroxaban
  • History of hypersensitivity to any of the investigational medicinal products or to any drug with similar chemical structure or to any excipient present in the pharmaceutical form of the investigational medicinal product.
  • Ongoing participation in other clinical trials or within the last 3 months, or ongoing therapy with one of the study medications.
  • Medical or psychological condition that would not permit completion of the trial or signing of informed consent.
  • Patients with acute ST-elevation myocardial infarction

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Ticagrelor
Ticagrelor 180mg oral loading dose and 90mg b.i.d for 30 days following coronary artery stenting
Procedure: Coronary stenting
All patients will receive a drug eluting stent as clinically indicated.
Drug: Ticagrelor
Ticagrelor 180mg oral loading dose and 90mg b.i.d for 30 days following coronary artery stenting
Active Comparator: Clopidogrel
Clopidogrel 600mg loading dose + 75 mg once a day for 30 days following coronary artery stenting.
Procedure: Coronary stenting
All patients will receive a drug eluting stent as clinically indicated.
Drug: Clopidogrel
Clopidogrel 600mg loading dose + 75 mg once a day for 30 days following coronary artery stenting.
Active Comparator: Prasugrel
Prasugrel 60mg oral loading dose followed by 10mg once a day for 30 days following coronary artery stenting
Procedure: Coronary stenting
All patients will receive a drug eluting stent as clinically indicated.
Drug: Prasugrel
Prasugrel 60mg oral loading dose followed by 10mg once a day for 30 days following coronary artery stenting

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change in FMD
Time Frame: baseline and 1 month
The primary endpoint is the change in flow-mediated dilation (FMD) (comparison before treatment versus after treatment and stenting) in the three study groups. The mean FMD across the three measurements (1 day, 1 week, 1 month) performed after coronary artery stenting will be compared to the FMD value before drug administration and stenting.
baseline and 1 month

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
FMD 2 hours after loading dose
Time Frame: baseline and 2 hours after loading dose
Change in FMD 2 hours after the administration of the study drug
baseline and 2 hours after loading dose
L-FMC at 2 hours after the loading dose
Time Frame: baseline and 2 hours
change in L-FMC at two hours after the loading dose
baseline and 2 hours
L-FMC 1 month after loading dose
Time Frame: baseline and 1 day after stenting
change in flow-mediated constriction (L-FMC) (comparison before treatment versus after treatment and stenting) in the three study groups. The mean L-FMC across the three measurements (1 day, 1 week, 1 month) performed after coronary artery stenting will be compared to the value before drug administration and stenting
baseline and 1 day after stenting
Safety and tolerability
Time Frame: from baseline to 1 month after enrollment
Number of patients with adverse events.
from baseline to 1 month after enrollment

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Johannes Gutenberg University Mainz

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Chair: Thomas Munzel, MD Prof., University Medical Center Mainz

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 1, 2012

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 1, 2016

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 1, 2016

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 4, 2012

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 3, 2012

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 4, 2012

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 7, 2016

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 4, 2016

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CTH-C1

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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