Fig. 1

A diagram of the flow of the study. In Institution A: 57 out of 341 patients on chronic hemodialysis had a documented history of atrial fibrillation. Of whom, 52 patients had non-valvular Atrial fibrillation, and 5 had valvular atrial fibrillation. 21 patients were still on warfarin at their last encounter during the study period, in whom, 1 patient was excluded because duration of outpatient INR testing was <140 days. 20 patients were included in the final TTR analysis. In Institution B: 54 out of 300 patients on chronic hemodialysis had a documented history of atrial fibrillation. Of whom, 48 patients had non-valvular Atrial fibrillation, and 6 had valvular atrial fibrillation. 30 patients were still on warfarin at their last encounter during the study period, in whom, 2 patient were excluded because duration of outpatient INR testing was <140 days. 2 patients were added to the final TTR analysis, because they were on warfarin, but stopped during study period with duration of non-hospitalized INR testing ≥140 day. 30 patients were included in the final TTR analysis. *valvular atrial fibrillation: atrial fibrillation in patients with rheumatic mitral disease, mitral stenosis or prosthetic heart valves; †TTR: Time in Therapeutic Range