Additional risk factors in atrial fibrillation patients not receiving warfarin

To study how many elderly inpatients with previously diagnosed atrial fibrillation were not receiving anticoagulant prophylaxis, and the prevalence of additional risk factors in these patients. All new admissions to a department of medicine for the elderly were screened for atrial fibrillation. Additional risk factors were analysed in those with established atrial fibrillation who were not receiving warfarin. Previous hospital admissions, documentation of why prophylaxis was not being used and use of aspirin as an alternative agent were also examined. 56 patients had previously diagnosed atrial fibrillation; 82% were not taking warfarin and 71% of these were not on aspirin either. All patients not taking warfarin had one additional risk factor for stroke and 95% had two or more. Fifty-two percent had attended hospital when atrial fibrillation was present within the previous 3 years and there was nothing documented in their records to explain why anticoagulation had not been used. Most elderly inpatients with established atrial fibrillation were not taking warfarin. All had additional risk factors for stroke, which increase the absolute benefit of anticoagulation.