Oral Anticoagulant Use in Atrial Fibrillation-Associated Ischemic Stroke: A Retrospective, Multicenter Survey in Northwestern China

Abstract

Background: Anticoagulation therapy has been recommended by major guidelines to reduce the risk of recurrent stroke in patients with atrial fibrillation-associated ischemic stroke (AFAIS). However, in real-world clinical practice, oral anticoagulants with either vitamin K antagonists or nonvitamin K antagonists are often underused for these patients. Here, we sought to investigate the current status of oral anticoagulant use in patients with AFAIS in northwestern China.

Methods: We reviewed medical records of consecutive patients with AFAIS discharged from 14 hospitals in northwestern China between January 2012 and May 2015.

Results: A total of 1014 cases were included in this study. The mean age of the patients was 70.3 ± 10.8 years. Fifty-four percent were female. Among all participants, only 20.0% received anticoagulants (19.4% warfarin and .6% nonvitamin K antagonist oral anticoagulants), whereas 57.5% took antiplatelet drugs and 22.5% received neither anticoagulant nor antiplatelet treatment. Anticoagulant use decreased with increasing age and CHA2DS2-VASc scores. The proportions of anticoagulant use at discharge in patients younger than 65 years, 65-74 years, and 75 years or older were 28.5%, 20.7%, and 13.9%, respectively. Nonvalvular atrial fibrillation patients with CHA2DS2-VASc scores of 2, 3, 4, 5, 6, and 7 had anticoagulant use rates at discharge of 19.2%, 24.8%, 20.3%, 13.7%, 8.1%, and 8.0%, respectively.

Conclusions: In northwestern China, oral anticoagulants are substantially underutilized in patients with AFAIS, especially in patients at higher risk of stroke, suggesting a large treatment gap in the secondary prevention management in patients with AFAIS.

Keywords: Atrial fibrillation; anticoagulants; northwestern China; secondary prevention; stroke.