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
- Diseases
- Atrial fibrillation
- 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
Sites (10)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Aalborg University Hospital Coordinator of this site? Confirm its status | Aalborg | Denmark | Recruiting |
| Aarhus Universitetshospital Coordinator of this site? Confirm its status | Aarhus N | Denmark | Recruiting |
| Rigshospitalet Coordinator of this site? Confirm its status | Copenhagen Oe | Denmark | Recruiting |
| Gentofte Hospital Coordinator of this site? Confirm its status | Hellerup | Denmark | Recruiting |
| Region Midtjylland Coordinator of this site? Confirm its status | Herning | Denmark | Recruiting |
| Odense University Hospital Coordinator of this site? Confirm its status | Odense C | Denmark | Recruiting |
| Sahlgrenska University Hospital-Vaestra Goetalandsregionen Coordinator of this site? Confirm its status | Gothenburg | Sweden | Recruiting |
| Lund University Hospital Coordinator of this site? Confirm its status | Lund | Sweden | Recruiting |
| Universitetssjukhuset Örebro Coordinator of this site? Confirm its status | Örebro | Sweden | Recruiting |
| Karolinska University Hospital Coordinator of this site? Confirm its status | Stockholm | Sweden | Recruiting |
This page is information, not medical advice. Discuss any trial with your doctor.