Effect of Pretreatment With Ticagrelor on Residual Thrombus After PCI in Patients Presenting With ACS in Comparison With Delayed Treatment at the Time of PCI: an OCT Study

May 23, 2014 updated by: Ik-Kyung Jang, MD, PhD, Massachusetts General Hospital

Effect of Pretreatment With Ticagrelor on Residual Thrombus After Percutaneous Coronary Intervention (PCI) in Patients Presenting With Acute Coronary Syndrome in Comparison With Delayed Treatment at the Time of PCI: an Optical Coherence Tomography Study

Subjects presenting with probable acute coronary syndromes scheduled for cardiac catheterization will be enrolled in this study. Consented subjects will be randomized to receive ticagrelor started with a loading dose immediately after enrollment versus receiving a loading dose of ticagrelor during cardiac catheterization after diagnostic angiography but prior to stenting. Optical coherence tomography (OCT) will be performed after stenting and the volume of thrombus within the new stent will be measured and compared between the groups.

Study Overview

Status

Status

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Withdrawn

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

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

  • United States
    • Massachusetts
      • Boston, Massachusetts, United States, 02114
        • Massachusetts General Hospital

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 79 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

Patient Characteristics:

  1. Males and non-pregnant females > or equal to 18 and < or equal to 79 years of age presenting with suspected acute coronary syndrome (unstable angina or NSTEMI)
  2. Patients likely to be scheduled to undergo coronary angiography with possible percutaneous coronary intervention (PCI)

Lesion Characteristics on Diagnostic Coronary Angiography:

  1. De novo lesions in native coronary arteries found by diagnostic coronary angiography
  2. Angiographic stenosis <100%
  3. Reference vessel diameter 2.5 mm - 4.0 mm by visual estimation

Exclusion Criteria:

Patient Specific Exclusion Criteria:

  1. Subjects who are unable or unwilling to sign the informed consent form.
  2. Subjects being treated with anti-platelet medications other than aspirin prior to diagnostic catheterization including glycoprotein IIb/IIIa inhibitors.
  3. Subjects with serious co-morbid conditions that in judgment of the investigator preclude inclusion in this study
  4. Subjects with NYHA class III or IV heart failure or known left ventricular ejection fraction < 30%.
  5. Subjects with an ST elevation myocardial infarction.
  6. Subjects with hemodynamic or electrical instability (including shock).
  7. Subjects diagnosed with severe, non-catheter-related coronary artery spasm.
  8. Subjects who are or may be pregnant.
  9. Subjects with known allergies to contrast media.
  10. Subjects with eGFR < 60 ml/min/1.73m2.
  11. Subjects currently taking oral anticoagulants with an absolute contraindication to discontinuation of anticoagulation.
  12. History of TIA or stroke < 6 months.
  13. History of hemorrhagic stroke.
  14. Hepatic insufficiency defined as liver cirrhosis, AST/ALT/Alkaline Phosphatase greater than 3 times the upper limit of normal or hyperbilirubinemia.
  15. Cardiac catheterization scheduled within 4 hours of randomization or more then 72 hours after randomization.

Lesion Specific Exclusion Criteria. These exclusion criteria apply to the target lesion to be imaged by OCT.

  1. Lesions located in the left main coronary artery
  2. Lesions that are heavily calcified
  3. Lesions where OCT cannot be performed due to technical difficulties
  4. Other lesions that the investigator deems inappropriate for the procedure such as sites with excessive tortuosity or low flow by TIMI grade.
  5. Lesions in saphenous vein grafts or arterial conduits.

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

  • 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- Delayed Administration
Subjects receive 180 mg of ticagrelor during cardiac catheterization after diagnostic angiography and prior to stenting. OCT is performed prior to and after coronary artery stenting.
Procedure: Optical Coherence Tomography
Drug: Ticagrelor- Delayed Administration
Subjects are randomized to receive ticagrelor immediately after enrollment versus at the time of cardiac catheterization. OCT is performed prior to and after coronary artery stenting.
Active Comparator: Ticagrelor- Immediate Administration
Subjects receive 180 mg of ticagrelor immediately after study enrollment. OCT is performed prior to and after coronary artery stenting.
Procedure: Optical Coherence Tomography
Drug: Ticagrelor- Immediate Administration
Subjects are randomized to receive ticagrelor immediately after enrollment versus at the time of cardiac catheterization. OCT is performed prior to and after 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
Total thrombus burden as measured by the volume of in-stent thrombus quantified by planimetry.
Time Frame: Thrombus burden will be measured at the end of the coronary artery stenting procedure.
The total thrombus burden measured on OCT images will be assessed. The volume of in-stent thrombus will be quantified by planimetry.
Thrombus burden will be measured at the end of the coronary artery stenting procedure.

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
PRI (platelet reactivity index) as measured bu the PLT-VASP assay.
Time Frame: PRI iwill be measured at the time of OCT image acquisition.
The extent of platelet inhibition will be measured by PLT-VASP and VerifyNow P2Y12 assays.
PRI iwill be measured at the time of OCT image acquisition.
P2Y12 Reaction Units as measured by the VerifyNow P2Y12 assay.
Time Frame: P2Y12 will be measured at the time of OCT image acquisition.
The extent of platelet inhibition will be measured by PLT-VASP and VerifyNow P2Y12 assays.
P2Y12 will be measured at the time of OCT image acquisition.

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
PCI-related myocardial infarction (MI)
Time Frame: PCI-related MI will be assesed within 24 hours after the end of the coronary artery stenting procedure.
PCI related myocardial infarction is defined by the third Universal definition of myocardial infarction.
PCI-related MI will be assesed within 24 hours after the end of the coronary artery stenting procedure.

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.
Massachusetts General Hospital

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
AstraZeneca

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.
February 1, 2014

Primary Completion (Anticipated)

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.
February 1, 2015

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).
August 2, 2013

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.
August 2, 2013

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.
August 6, 2013

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.
May 26, 2014

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.
May 23, 2014

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.
May 1, 2014

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.
  • 2013P001322

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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