A Study of the Antiplatelet Effects Comparing Ticagrelor (Ticag. - AZD6140) With Clopidogrel (Clop.) Responder and Non-responders (RESPOND)

August 30, 2011 updated by: AstraZeneca

A Randomised, Double-Blind, Outpatient, Crossover Study of the Anti-platelet Effects of Ticagrelor Compared With Clopidogrel in Patients With Stable Coronary Artery Disease Previously Identified as Clopidogrel Non-responders or Responders [RESPOND]

The purpose of this study is to see how Ticagrelor, a new oral reversible anti-platelet medication, affects platelets. Anti-platelet agents are medications that block the formation of blood clots by preventing the clumping of platelets. Blood clots prevent us from bleeding, but when they form inside the arteries their formation is linked to a risk of medical problems such as heart attack and stroke. This study investigated the effect of Ticagrelor on inhibition of platelet aggregation compared with clopidogrel in patients previously identified as non-responsive to clopidogrel.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

98

Phase

  • Phase 2

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

  • Canada
      • Lachine, Canada
        • Research Site
    • Ontario
      • Hamilton, Ontario, Canada
        • Research Site
  • Denmark
      • Aalborg, Denmark
        • Research Site
      • Arhus, Denmark
        • Research Site
      • Esbjerg, Denmark
        • Research Site
  • United Kingdom
      • Sheffield, United Kingdom
        • Research Site
  • United States
    • Arkansas
      • Jonesboro, Arkansas, United States
        • Research Site
    • Florida
      • Ormond Beach, Florida, United States
        • Research Site
    • Maryland
      • Baltimore, Maryland, United States
        • Research Site
    • Ohio
      • Cincinnati, Ohio, United States
        • Research Site

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

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Patients with documented stable Coronary Artery Disease (CAD) (stable angina, previous MI history, previous history of revascularization)
  • Females of child bearing potential must have a negative pregnancy test prior to receiving study drug and be willing to use a hormonal contraceptive in addition to double barrier contraception

Exclusion Criteria:

  • History of Acute Coronary Syndromes within 12 months of screening or need for revascularization (angioplasty or coronary artery bypass graft (CABG))
  • Any acute or chronic unstable condition in the past 30 days
  • Have increased bleeding risk, eg, recent gastrointestinal bleed, uncontrolled high blood pressure, low platelet count, recent major trauma
  • History of intolerance or allergy to aspirin or clopidogrel

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 1
Aspirin + Ticagrelor
Drug: Ticagrelor
Tablets, Oral, 90 mg; 180 mg loading dose followed by 90 mg twice daily for 2 weeks
Drug: Aspirin
Tablets, Oral, 75 mg to 100 mg once daily. Aspirin obtained locally by the investigator, according to local practice. The dose remained constant throughout the study
Active Comparator: 2
Aspirin + Clopidogrel
Drug: Aspirin
Tablets, Oral, 75 mg to 100 mg once daily. Aspirin obtained locally by the investigator, according to local practice. The dose remained constant throughout the study
Drug: Clopidogrel
(over encapsulated) capsule, Oral, 75 mg; 600 mg loading dose followed by 75 mg once daily for 2 weeks
Other Names:
  • Plavix

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Proportion of Clopidogrel Non-responders Who Responded to Clopidogrel or Ticagrelor. - Comparing Ticag. (Day 28 of Clop. to Ticag., and Day 14 of Ticag. to Clop.) Versus Clop. (Day 14 of Clop. to Ticag., and Day 28 of Ticag. to Clop.)
Time Frame: Day 14 and Day 28, 4 Hrs Post Dose.
The primary definition of response to treatment is IPA >10% post treatment. The response is reported as percentage of participants of each treatment. Please refer to the protocol section for details about the interventions administered. IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition.
Day 14 and Day 28, 4 Hrs Post Dose.
Proportion of Clopidogrel Non-responders Who Responded to Clopidogrel or Ticagrelor. - Comparing Ticag. (Day 28 of Clop. to Ticag., and Day 14 of Ticag. to Clop.) Versus Clop. (Day 14 of Clop. to Ticag., and Day 28 of Ticag. to Clop.
Time Frame: Day 14, and day 28, 4 hours post dose
The secondary definition of response to treatment is IPA >50% post treatment. The response is reported as percentage of participants of each treatment. Please refer to the protocol section for details about the interventions administered. IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition.
Day 14, and day 28, 4 hours post dose

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Clopidogrel Responders Final Extent IPA Post Switching Treatment - Comparing Ticagrelor to Ticagrelor Versus Ticagrelor to Clopidogrel on Day 15
Time Frame: Day 15, 4 hrs post switching
IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition. Please refer to the protocol section for details about the interventions administered.
Day 15, 4 hrs post switching
Clopidogrel Responders Final Extent IPA Post Switching Treatment - Comparing Ticagrelor to Ticagrelor Versus Ticagrelor to Clopidogrel on Day 28
Time Frame: 4 hrs post first dose on day 28
IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition. Please refer to the protocol section for details about the interventions administered.
4 hrs post first dose on day 28
Clopidogrel Responders Final Extent IPA Post Switching Treatment - Comparing Clopidogrel to Clopidogrel Versus Clopidogrel to Ticagrelor on Day 15
Time Frame: Day 15, 4 hrs post switching
IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition. Please refer to the protocol section for details about the interventions administered.
Day 15, 4 hrs post switching
Clopidogrel Responders Final Extent IPA Post Switching Treatment - Comparing Clopidogrel to Clopidogrel Versus Clopidogrel to Ticagrelor on Day 28
Time Frame: 4 hrs post first dose on day 28
IPA(%)=(PAb-PAt)/PAb*100. PA (platelet aggregation) is measured by LTA (Light Transmittance Aggregometry). PAb is the response at baseline (last measurement before study drug) and PAt is a response at post-treatment. IPA=0% means no PA inhibition and 100% means 100% PA inhibition. Please refer to the protocol section for details about the interventions administered.
4 hrs post first dose on day 28

Collaborators and Investigators

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

Sponsor

AstraZeneca

Investigators

  • Study Director: Jay Horrow, MD, AstraZeneca
  • Principal Investigator: Paul Gurbel, MD, Platelet & Thrombosis Research, LLC

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

May 1, 2008

Primary Completion (Actual)

March 1, 2009

Study Completion (Actual)

March 1, 2009

Study Registration Dates

First Submitted

March 19, 2008

First Submitted That Met QC Criteria

March 19, 2008

First Posted (Estimate)

March 25, 2008

Study Record Updates

Last Update Posted (Estimate)

October 4, 2011

Last Update Submitted That Met QC Criteria

August 30, 2011

Last Verified

August 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • D5130C00030

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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