Safety and Effectiveness of Warfarin for Stroke Prevention in Dialysis Patients with Atrial Fibrillation A Nationwide Randomized Trial
Led by Nicholas Carlson · Updated on 2026-05-19
718
Participants Needed
13
Research Sites
N/A
Total Duration
AI-Summary
What this Trial Is About
This research aims to evaluate whether starting oral anticoagulation with Warfarin reduces stroke risk safely and effectively in patients with end-stage renal disease who are on dialysis and have atrial fibrillation. The study addresses the lack of clear evidence on the benefits and risks of anticoagulation in this population, as they are often excluded from trials. It is a nationwide, open-label, randomized trial designed to provide conclusive data on the use of Warfarin for stroke prevention in these patients.
Participants will be randomly assigned to one of two groups one receiving Warfarin with dosing adjusted to maintain an international normalized ratio INR of 2 to 3, and the other receiving no treatment. The trial plans to enroll 718 dialysis patients with atrial fibrillation, following them for at least one year with ongoing monitoring. The randomization is stratified by gender, age, and center, and the study will last up to four years to observe outcomes.
During the study, participants will be regularly monitored for safety and effectiveness outcomes, including ischemic or unspecified strokes, transient ischemic attacks, major bleeding events, and death. The primary outcomes focus on the number of participants experiencing stroke or major bleeding from the time of randomization up to four years. Secondary outcomes include various stroke subtypes and mortality rates. The study includes ongoing assessments to track safety and tolerability throughout the observation period.
CONDITIONS
Brief Title
The Danish Warfarin-Dialysis Study - Safety and Efficacy of Warfarin in Patients With Atrial Fibrillation on Dialysis
Research Team
N
Nicholas Carlson, MD PhD Ass. Prof
E
Ellen LF Ballegaard, MD PhD
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Patients 18 years or older on chronic dialysis due to end-stage renal disease
Diagnosed with non-valvular paroxysmal, persistent, or permanent atrial fibrillation, or untreated atrial fibrillation for more than 2 months confirmed by ECG or monitoring devices
Able to understand the study rationale and provide written informed consent
You will not qualify if you...
CHA2DS2-VASc Score of 1 or less
Other reasons for oral anticoagulation treatment such as recent pulmonary embolism, deep vein thrombosis, or mechanical heart valve
Ongoing dual antiplatelet treatment
Recent or ongoing malignancy within the past year, excluding non-melanoma skin cancer
Gastrointestinal ulcer within the past month
Esophageal varices
Autoimmune or genetic coagulation disorders
Congenital alactasia, Lapp Lactase deficiency, or glucose-galactose malabsorption
Pending spinal tap
Cerebrovascular malformations
Arterial aneurysms
Ulcers or wounds with Wagner grade above 1
Bacterial endocarditis within the past 3 months
Active bleeding that prevents anticoagulation
Non-elective or non-ambulatory surgery within the past 7 days
Cerebral hemorrhage within the past 4 weeks
Thrombocytopenia with platelet count below 100 x 10^9/L within 30 days
Severe liver insufficiency with spontaneous INR above 1.5 within 30 days
Known intolerance to Warfarin
Use of St. John's Wort
Uncontrolled hypertension with blood pressure over 180/110 mmHg within 30 days
Uncontrolled hyperthyroidism with TSH below 0.1 microIU/mL within 30 days
Pregnancy or lactation
Participation in other intervention trials that could affect study outcomes
Your Study Journey
Screening
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Treatment
Duration - At least 1 year following randomization
Participants are randomized to either start warfarin treatment with dose adjustments to maintain target blood levels or receive no treatment, and are followed for stroke risk reduction and safety.
Regular visits for dose monitoring and safety assessments throughout treatment
Follow-up
Duration - Up to 4 years from randomization
Participants continue to be monitored for efficacy and safety outcomes including stroke, bleeding events, and mortality up to 4 years from randomization.
Periodic visits as scheduled for ongoing assessment
How is the study designed?
Study Type
INTERVENTIONAL
Masking
NONE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
PREVENTION
Number of Arms
2
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Published Research Related To This Trial
Protocol for a randomised controlled trial comparing warfarin with no oral anticoagulation in patients with atrial fibrillation on chronic dialysis: the Danish Warfarin-Dialysis (DANWARD) trial.
Ellen Linnea Freese Ballegaard, Kristine Lindhard, Morten Lindhardt...