Antithrombotic Therapy in Acute Coronary Syndromes and Coronary Artery Ectasia (OVER-TIME)

January 31, 2022 updated by: Diego Araiza-Garaygordobil, Instituto Nacional de Cardiologia Ignacio Chavez

A Randomized Controlled Trial of Dual Antiplatelet Therapy Versus Antiplatelet Monotherapy and Oral Anticoagulation in Patients With Acute Coronary Syndrome and Coronary Artery Ectasia: OVER-TIME

The optimal anti-thrombotic therapy to prevent recurrent ischemic events in patients with acute coronary syndrome and coronary artery ectasia (CAE) remains unclear.

OVER-TIME is an investigator initiated, exploratory, open label, single center, randomized clinical trial comparing dual antiplatelet therapy (acetyl-salicylic acid plus a P2Y12 inhibitor) with the combination of an antiplatelet monotherapy (a P2Y12 inhibitor) plus a low dose anticoagulant (rivaroxaban, 15mg oral dose) for the prevention of recurrent ischemic events among patients with CAE. The investigators aim to enroll 60 patients with CAE and acute coronary syndromes. After recruitment, patients are randomized to (a) standard of care (dual antiplatelet regimen) or (b) the combination of antiplatelet monotherapy and low dose anticoagulant. Patients will be followed for at least 12 months. The OVER-TIME study aims to assess the efficacy of the regimen in prevention of major cardiovascular events and its security in bleeding events in acute coronary syndromes among patients with CAE.

OVER-TIME is the first randomized controlled trial to assess different antithrombotic strategies in patients with CAE and acute coronary syndrome, and its results will offer preliminary data for the prevention of major cardiovascular events and bleeding events in this group of patients.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Coronary artery ectasia (CAE) is defined as a segmental or diffuse abnormal dilatation that exceeds more than 1.5 times the diameter of a normal adjacent coronary segment. The prevalence of CAE ranges from 0.3 to 4.9% and atherosclerosis is believed to be the most common etiology. According to angiographic findings, blood flow might be altered by the inappropriate dilatation in the affected arteries resulting in platelet activation and thrombus formation. Also, the presence of CAE has been related with elevated inflammatory markers and plasma soluble adhesion molecules which are an important component of vascular aneurysm formation.

Patients with MI and CAE have an increased risk of major adverse cardiovascular events (MACE) compared with those without CAE. However, it is unclear which is the optimal antithrombotic therapy for the prevention of recurrent ischemic events in patients with CAE after acute coronary syndrome (ACS)

OVER-TIME will be the first randomized controlled trial to provide insight into the safety and efficacy of different antithrombotic strategies in patients with CAE after an ACS event.

OVER- TIME is an investigator initiated, exploratory, open label, single center, randomized clinical trial comparing dual antiplatelet therapy (acetyl-salicylic acid plus a P2Y12 inhibitor) versus the combination of antiplatelet monotherapy (P2Y12 inhibitor) plus low dose anticoagulant (rivaroxaban, 15mg oral dose) for prevention of recurrent ischemic events in patients with established CAE and ACS. The trial protocol received local research and ethics committee approval and complies with the principles of the Declaration of Helsinki. Written informed consent was obtained from all patients prior to randomization.

Study patients are aged 18 or more, hospitalized with the diagnosis of ACS (NSTEMI & STEMI) undergoing coronary angiogram showing CAE in the infarction culprit artery. CAE is defined as segmental or diffuse abnormal dilatation that exceeds more than 1.5 times the diameter of a normal adjacent coronary segment. The definition of a CAE case will be based on the opinion of two independent interventional cardiologists.

The study is considered a pilot, because no randomized controlled trial has been performed to compare the efficacy of different types of antithrombotic regimens in patients with CAE after ACS. Considering a power (1-β) of 80%, an alpha level of 0.05%, accounting on the event rates of approximately 5% in patients with oral anticoagulation versus 33% in patients with dual antiplatelet therapy at 1 year of follow- up, and assuming 10% losses, the investigators calculated a sample size of 60 patients (30 per arm) for the study.

Patients are screened for the eligibility criteria during hospitalization and are randomized using 4x4 permuted blocks, after providing informed consent. Patients and treating physicians are not blinded to the allocation arm.

Patients are randomized in a 1:1 ratio to receive during 12 months a daily oral dose of DAPT (acetyl-salicylic acid 100 mg and clopidogrel 75 mg) or the combination of SAPT (clopidogrel 75 mg) and low dose of anticoagulant (rixaroxaban 15 mg). Patients will be followed for 12 months in 3 pre-specified visits (30 days, 6 months and 12 months after hospitalization). At each visit, basic clinical data will be recorded and clinical events (both ischemic and hemorrhagic, as well as safety and adverse drug events) will be actively screened.

The study has 2 co-primary endpoints, including (1) efficacy in prevention of MACE defined as the composite of cardiovascular death, non-fatal infarction, and repeated revascularization; and (2) security in major and minor bleeding, defined as a composition of major and minor bleeding events using the Bleeding Academic Research Consortium (BARC) classification.

Additionally, there are 3 secondary endpoints, including (1) the composite of net clinical benefit defined as a composite of cardiovascular death, non-fatal infarction, repeated revascularization, and major & minor bleeding events according to the BARC classification; (2) the individual components of the 2 co-primary endpoints, and (3) to compare the fibrin clot properties, by the analysis of clot lysis time and maximum turbidity, at recruitment and at 6 month of treatment.

Other clinically relevant variables such as baseline characteristics, personal history, clinical presentation, LVEF, high sensitivity cardiac troponin, NTproBNP, renal function, interventional aspects of treatment (such as stent placement, number of affected vessels, quantitative coronary angiography characterization) and other concomitant treatments will also be measured by the research staff during index event and subsequent visits.

Both the co-primary endpoints will be evaluated using the time to the occurrence of the first event. Time to the occurrence of the primary outcome and its components will be evaluated with Kaplan- Meier estimates, Log Rank Test and Cox proportional hazard models. Alternatively, analysis by "Win ratio" will be performed. For secondary outcomes, chi-squared test, T test or Wilcoxon Rank- Summation Test will be used, as appropriate.

Plasma samples will be collected from patients randomized in any group of antithrombotic therapy to analyze fibrin clots with special interest to study clot lysis time and maximum turbidity (a measure of clot density) to determine fibrin clot properties associated with clinical outcomes following CAE and ACS. This analysis may provide additional, surrogate data, as clot lysis time has been significantly associated with a higher risk of recurrent ischemic events in the long term () .

Study Type

Interventional

Enrollment (Anticipated)

60

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 Contact

  • Name: Diego Araiza Garaygordobil, MD, MSc
  • Phone Number: 142 55 5573 2911
  • Email: dargaray@gmail.com

Study Locations

  • Mexico
      • Mexico City, Mexico, 14030
        • Recruiting
        • Instituto Nacional de Cardiologia
        • Contact:
      • Mexico City, Mexico, 14030
        • Recruiting
        • Instituto Nacional de Cardiología "Ignacio Chávez"
        • Contact:
        • Principal Investigator:
          • Alexandra Arias-Mendoza, MD

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 to 99 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Informed consent obtained before any trial-related activities.
  • Hospitalized male or female aged >18 years.
  • First event of ACS (including both, ST- Segment Elevation or Non- ST Elevation Myocardial Infarction) with high sensitivity troponin T levels exceeding 99th percentile or segmental motion abnormalities by echocardiography.
  • Angiographic evidence of CAE involving the infarction culprit artery.
  • Hospital length of stay >24 hours.
  • Percutaneous revascularization or medical treatment according to the treating physician criteria.

Exclusion Criteria:

  • Indication for temporary or permanent anticoagulation.
  • Relative or absolute contraindications to receive anticoagulation.
  • Chronic kidney disease (CKD) KDIGO > III or GFR <30 ml/min/1.73 m2
  • Angiographic evidence of coronary aneurysms (saccular or fusiform)
  • Patients undergoing coronary artery bypass graft (CABG).
  • Left ventricular ejection fraction <40%.
  • History of major bleeding events.
  • Pregnant women.

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: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Dual antiplatelet therapy
Acetyl salicylic acid, 100mg once a day + clopidogrel 75mg, once a day.
Drug: Acetylsalicylic acid 100mg
Acetylsalicylic acid 100mg
Other Names:
  • Aspirin
Drug: Clopidogrel 75 Mg Oral Tablet
Clopidogrel 75mg
Other Names:
  • Plavix
Experimental: Antiplatelet monotherapy + low dose anticoagulant
Clopidogrel 75mg + Rivaroxaban 75mg
Drug: Clopidogrel 75 Mg Oral Tablet
Clopidogrel 75mg
Other Names:
  • Plavix
Drug: Rivaroxaban 15 MG
Rivaroxaban 15mg
Other Names:
  • Clopidogrel 75mg

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Composite of cardiovascular death, recurrent MI and repeated revascularization
Time Frame: 1 year.
Main efficacy combined outcome of cardiovascular death, recurrent MI and repeated revascularization
1 year.
Composite of minor and major bleeding events.
Time Frame: 1 year
Main safety combined outcome of minor and major events, measured by BARC scale.
1 year

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Net clinical benefit composite endpoint, including cardiovascular death, recurrent MI, repeated revascularization and minor/major bleeding
Time Frame: 1 year
Composite of cardiovascular death, recurrent MI, repeated revascularization and minor/major bleeding
1 year
Clot lysis time by turbidimetry
Time Frame: 6 months
Time (in seconds) taken for turbidity to drop by 50% from maximum as a measure of lysis potential
6 months

Collaborators and Investigators

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

Sponsor

Instituto Nacional de Cardiologia Ignacio Chavez

Investigators

  • Principal Investigator: Diego Araiza Garaygordobil, MD, MSc, Instituto Nacional De Cardiologia Ignacio Chavez
  • Study Director: Alexandra Arias Mendoza, MD, Instituto Nacional De Cardiologia Ignacio Chavez

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 (Actual)

September 1, 2021

Primary Completion (Anticipated)

June 30, 2023

Study Completion (Anticipated)

July 30, 2024

Study Registration Dates

First Submitted

January 14, 2022

First Submitted That Met QC Criteria

January 31, 2022

First Posted (Actual)

February 10, 2022

Study Record Updates

Last Update Posted (Actual)

February 10, 2022

Last Update Submitted That Met QC Criteria

January 31, 2022

Last Verified

January 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 21-1248

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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