Evidence that anticoagulant use decreases in-hospital deaths in patients with new-onset atrial fibrillation.

Objective: Current guidelines provide no clear recommendations for managing new-onset atrial fibrillation in critical illness, particularly with respect to anticoagulant use. This retrospective study aimed to evaluate the efficacy and safety of anticoagulants in such patients.
Materials and Methods: Patients in the intensive care unit with new-onset atrial fibrillation were recruited during the period January 1, 2021, to June 30, 2022. Ischemic stroke and bleeding were considered primary outcomes, and in-hospital death was considered the secondary outcome. Hazard ratios for outcomes were determined using the Cox proportional hazard model.
Results: A total of 92 patients were included in the study of which 29 were anticoagulant users and 63 non-users. No significant differences were observed on the risk of ischemic stroke (HR, 3.46; 95% CI, 0.22 - 55.8, p = 0.38) and bleeding (HR, 1.07; 95% CI, 0.52 - 2.23, p = 0.85), but anticoagulant use was associated with a significantly decreased risk of in-hospital death (HR, 0.43; 95% CI, 0.19 - 0.97, p = 0.04).
Conclusion: Anticoagulant use in critically ill patients with new-onset atrial fibrillation did not increase the risk of bleeding and ischemic stroke but significantly reduced in-hospital deaths. These findings need confirmation in a randomized controlled trial.