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Anticoagulation use and predictors of stroke, bleeding and mortality in multi-ethnic Asian patients with atrial fibrillation: A single centre experience.

INTRODUCTION: Atrial fibrillation (AF) is the most common cardiac arrhythmia in singapore. We describe a cohort of multi-ethnic Asian patients with AF, with the aim to evaluate anticoagulation use and to identify factors predictive of stroke, bleeding and all-cause mortality.

MATERIALS AND METHODS: this was a single centre, retrospective cohort study. All patients with an admission diagnosis of AF between 1 January 2000 and 31 December 2010 were identified. Of these patients, those who had follow-up data up to 31 December 2012 were included in the study.

RESULTS: there were 1095 eligible patients. the mean age was 67±14 years, mean cHADs2 score was 2±1 and mean HAs-bLED score 2±1. Of the 1095 patients, 657 (62.0%) had a cHADs2 score ≥ 2 but only 215 (32.7%) were eventually prescribed warfarin. Patients not on warfarin were older (p<0.0001) and were more likely females (p<0.0001). Among patients not on warfarin, 52% had HAs-bLED score ≤3. Multivariate analysis revealed that warfarin use and high HAs-bLED score were associated with increased bleeding risk. Age, Indian ethnicity and cHADs2 score were predictive of ischemic stroke. All-cause mortality was significantly related to age, presence of heart failure and HAs-bLED score.

CONCLUSIONS: Anticoagulation management of AF patients remains inadequate. Objective assessment of bleeding risks should be performed before withholding anticoagulation.

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