Anticoagulation Patterns Among Community-Dwelling Older Adults With Atrial Fibrillation.

Abstract

To assess clinicians' prescribing practices for anticoagulation in older adults with atrial fibrillation or atrial flutter (AF/F) and determine factors common among those without anticoagulation. We performed a community-based retrospective cohort study of adults aged 65 years and older with a history of nonvalvular AF/F to determine the rate of oral anticoagulation utilization. We also assessed for associations between anticoagulation use and comorbid conditions and common geriatric syndromes. A total of 3832 patients with a diagnosis of nonvalvular AF/F were included (mean [SD] age, 79.9 [8.4] years), 2693 (70.3%) of whom were receiving anticoagulation (51.7%, a vitamin K antagonist; 48.1%, a direct-acting oral anticoagulant). Patients with higher Elderly Risk Assessment index (ERA) scores, a surrogate for health vulnerability, received anticoagulation less often than patients with lower scores. The percentage of patients with a history of falling was higher among those who did not receive anticoagulation than among those who did (44.4% vs 32.8%; <i>P</i> < .001). Similarly, a diagnosis of dementia was more common in the no-anticoagulation group than the anticoagulation group (18.5% vs 12.7%; <i>P</i> < .001). A substantial proportion of older adults with AF/F do not receive anticoagulation. Those without anticoagulation had higher risk of health deterioration based on higher ERA scores and had a higher incidence of dementia and fall history. This suggests that the presence of geriatric syndromes may influence the decision to withhold anticoagulation.