The primary objective of this study is to evaluate the effectiveness (prevention of thromboembolic events) and safety (major bleeding) of adding oral anticoagulation (OAC) to background antiplatelet therapy in patients who develop new-onset post-operative atrial fibrillation (POAF) after isolated coronary artery bypass graft (CABG) surgery. All patients with a qualifying POAF event, who decline randomization, will be offered the option of enrollment in a parallel registry that captures their baseline risk profile and their treatment strategy in terms of anticoagulants or antiplatelets received. These patients will also be asked to fill out a brief decliner survey.



Eligible Ages
Over 18 Years
Eligible Genders
Accepts Healthy Volunteers

Inclusion Criteria

  • Patients of age ≥18 years who undergo isolated CABG for coronary artery disease - POAF that persists for >60 minutes or is recurrent (more than one episode) within 7 days after the index CABG surgery

Exclusion Criteria

  • Clinical history of either permanent, persistent or paroxysmal atrial fibrillation - Any pre-existing clinical indication for long-term OAC - Any absolute contraindication to OAC - Planned use of post-operative dual antiplatelet therapy (DAPT) a. This includes, but is not limited to, patients with recent PCI with drug-eluting or bare-metal stent. - Cardiogenic shock - Major perioperative complication* occurring between CABG and randomization a. Including stroke, TIA, MI, major bleeding (BARC type 4 bleeding), severe sepsis, renal failure requiring dialysis, or need for reoperation due to bleeding (e.g. pericardial tamponade). - Concomitant left atrial appendage closure during CABG - Concomitant valve surgery during CABG (including aortic, mitral, tricuspid or pulmonary) - Concomitant or prior surgery for AF during CABG - Closure of an atrial septal defect or of a patent foramen ovale during CABG - Stage IV or V chronic kidney disease (estimated glomerular filtration rate [eGFR]<30 mL/min/1.73m2) - Liver cirrhosis or Child-Pugh Class C chronic liver disease - Pharmacologic therapy with an investigational drug or device within 30-days prior to randomization or plan to enroll patient in an investigational drug or device trial during participation in this trial - Pregnancy at the time of randomization - Unable or unwilling to provide inform consent - Unable or unwilling to comply with the study treatment and follow-up - Existence of underlying disease that limits life expectancy to less than one year

Study Design

Phase 4
Study Type
Intervention Model
Parallel Assignment
Intervention Model Description
This is a multicenter randomized clinical trial comparing OAC to no-OAC in addition to concomitant antiplatelet therapy in 3,200 eligible patients who develop POAF after isolated CABG. The trial will be conducted by the Cardiothoracic Surgical Trials Network (CTSN), the German Society for Thoracic and Cardiovascular Surgery (DGTHG) and other European sites.
Primary Purpose
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Active Comparator
Antiplatelet Therapy
Antiplatelet-only strategy
  • Drug: Antiplatelet-only strategy
    Aspirin 75-325 mg once-daily or a P2Y12-inhibitor (clopidogrel or ticagrelor)
Active Comparator
Oral Anticoagulant
OAC-based strategy
  • Drug: Oral Anticoagulant plus background antiplatelet therapy
    OAC with vitamin K antagonist (VKA) with international normalized ratio (INR) target 2-3 or any approved direct oral anticoagulant OR apixaban, rivaroxaban, edoxaban or dabigatran) in addition to background antiplatelet therapy with aspirin 75-325mg once-daily or a P2Y12-inhibitor (clopidogrel or ticagrelor)

Recruiting Locations

University of Maryland
Baltimore, Maryland 21201
Manal Al-Suqi

More Details

Icahn School of Medicine at Mount Sinai

Study Contact

Ellen Moquete, RN

Detailed Description

This is a prospective, multicenter, open-label, randomized trial comparing OAC with no OAC (1:1 ratio) in patients who develop new-onset POAF after CABG. The primary effectiveness endpoint is the composite of death, stroke, transient ischemic attack (TIA), myocardial infarction (MI), systemic arterial thromboembolism or venous thromboembolism (VTE) at 90 days after randomization. The primary safety endpoint is BARC (Bleeding Academic Research Consortium) grade 3 or 5 bleeding at 90 days after randomization. The overall intent is to evaluate the trade-off in prevention of thromboembolic events versus an increase in bleeding. Patients will be randomly assigned to the following treatment strategies: - OAC-based strategy (experimental arm): OAC with vitamin K antagonist (VKA) with international normalized ratio (INR) target 2-3 or any approved direct oral anticoagulant (apixaban, rivaroxaban, edoxaban or dabigatran) in addition to background antiplatelet therapy with aspirin 75-325mg once-daily or a P2Y12-inhibitor (clopidogrel or ticagrelor) - Antiplatelet-only strategy (control arm): with aspirin 75-325mg once-daily or a P2Y12-inhibitor (clopidogrel or ticagrelor) The protocol-specified duration of anticoagulation is 90 days. Patients, who are randomized to the control arm and develop recurrent AF after 30 days, may be crossed-over to an OAC. Accrual is expected to take 36 months. Study follow-up visits will be performed at 90 days and phone follow-up at 180 days. Data for patients enrolled in the registry will be ascertained from the local clinical site via a review of medical records. The baseline risk profile of registry patients (i.e., patients eligible but unwilling to be randomized) will be analyzed and compared to that of patients randomized in the trial. The usage of anticoagulant and antiplatelet therapies in the registry population overall and baseline CHA2DS2-VASC stroke risk score will also be determined. Patients will be offered the option of having biospecimens collected for future research.


Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.