Infarct Volumes of Patients with Acute Ischemic Stroke Receiving Direct Oral Anticoagulants due to Non-Valvular Atrial Fibrillation

Direct oral anticoagulants (DOACs) have been shown to decrease the risk of ischemic stroke in non-valvular atrial fibrillation (NVAF). This study aims to investigate whether DOACs result in a significant change in lesion volume and the severity of the subsequent disability in patients who have experienced a stroke. Methods: The study included a total of 137 patients with NVAF and acute stroke. The cohort included 76 patients using DOACs, 21 patients using acetylsalicylic acid (ASA), and 40 patients with newly diagnosed atrial fibrillation (NDAF) who did not use antiaggregants or anticoagulants. Diffusion-weighted MRI was performed 6-12 hours after the first stroke symptoms and infarct volumes were measured by two independent observers. Baseline National Institutes of Health Stroke Scale (NIHSS) score, modified Rankin Scale (mRS) score at discharge and period of hospitalization were calculated. Results: When patients using DOACs due to NVAF and patients with NDAF were compared, the volumes of patients using DOACs (median 7.8 vs 23.1 cm(3); P = 0.01) were statistically significantly smaller. However, there was no difference in volume between ASA users (median 16.9 cm(3); P = 0.16) and patients with NDAF. The DOACs group was significantly different compared to the NDAF group in terms of NIHSS scores (median 4.4 vs 8.3; P = 0.01) and mRS scores at discharge (median 1.7 vs 2.7; P = 0.01), and period of hospitalization (median 6.4 vs 10.4 days; P = 0.01). Conclusion: We observe, while using DOACs, the infarct volumes of patients who experience stroke are smaller than those with NDAF and using ASA, as well as mRS scores at discharge are low and length of hospital stay is short.