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NCT06401616RecruitingPhase 4

Can Patients With Atrial Fibrillation Safely Discontinue Anticoagulant Therapy After Cardiac Surgery? (ATLAAC)

Anticoagulant Therapy in Patients With Atrial Fibrillation After Surgical Left Atrial Appendage Closure: a Randomized Non-inferiority Trial (The ATLAAC Trial)

Source: ClinicalTrials.gov · Last updated 21 Oct 2026

Brief summary (registry, in English)

Left atrial appendage (LAA) closure has become a frequent addition to oral anticoagulation in patients with atrial fibrillation who undergo cardiac surgery. The procedure significantly reduces the risk of stroke and systemic embolism, which may render anticoagulation unnecessary or even harmful when considering the associated increased risk of bleeding. A clinical trial to address the need for anticoagulation after LAA closure is needed. The ATLAAC trial will enroll 1220 patients with atrial fibrillation who have previously undergone surgical LAA closure. Patients will undergo a cardiac CT-scan to determine if LAA closure was successful and patients with successful closure will be randomized to continue or discontinue anticoagulation. The trial will assess the risk of ischemic stroke, peripheral arterial embolism, and major bleeding during the randomized intervention

Status (registry)
Recruiting
Phase (registry)
Phase 4
Study type
Interventional
Enrollment
1220 (estimated)
First submitted
5 Mar 2024
Start date
21 May 2024
Primary completion date
1 Mar 2028
Lead sponsor
Odense University Hospital
NCT number
NCT06401616
EU CT number
2022-502986-92-00

What you commit to

  • Study type: Interventional · Phase 4
  • Planned participants: 1220
  • From 21 May 2024 to the primary completion date, 1 Mar 2028
  • 10 sites in 2 countries
  • Visits and tests: ask the trial team, the registry does not list them

Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.

Who cannot take part

Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.

Prior treatment

  • Not receiving OAC (warfarin/DOAC)
  • Patient specific conditions requiring OAC (e.g.mechanical valve, previous pulmonary embolism)

Other illness

  • Renal impairment (estimated glomerular filtration rate \< 30)
  • Allergy to contrast media

Other

  • Pregnancy or breastfeeding

Who the study is looking for

  • Age \> 18 years
  • Previously undergone any type of cardiac surgical procedure including any type of surgical LAA closure (use of any of the following techniques; amputation and suture closure, stapler closure, non-amputating suture closure or closure with an approved surgical occlusion device (e.g. AtriClip)) according to the NationalPatient Register (NPR), the Danish Heart Registry (DHR) or the Western Danish Heart Registry (WDHR) from January 1st 2010 til 3 months prior to inclusion in the project.
  • Documented history of paroxysmal, persistent, or permanent atrial fibrillation or atrial flutter according to the electronic patient record
  • Informed consent

Age in the registry: 18 years to - · Sex: All · Does not accept healthy volunteers

Full criteria on ClinicalTrials.gov

Sites (10)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
Aalborg University Hospital
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AalborgDenmarkRecruiting
Aarhus Universitetshospital
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Aarhus NDenmarkRecruiting
Rigshospitalet
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Copenhagen OeDenmarkRecruiting
Gentofte Hospital
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HellerupDenmarkRecruiting
Region Midtjylland
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HerningDenmarkRecruiting
Odense University Hospital
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Odense CDenmarkRecruiting
Sahlgrenska University Hospital-Vaestra Goetalandsregionen
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GothenburgSwedenRecruiting
Lund University Hospital
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LundSwedenRecruiting
Universitetssjukhuset Örebro
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ÖrebroSwedenRecruiting
Karolinska University Hospital
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StockholmSwedenRecruiting

This page is information, not medical advice. Discuss any trial with your doctor.