Time to therapeutic range (TtTR), anticoagulation control, and cardiovascular events in vitamin K antagonists–naive patients with atrial fibrillation
Background: Vitamin K antagonists (VKAs) reduce cardiovascular events (CVEs) in atrial fibrillation (AF) when a time in therapeutic range (TiTR) >70% is achieved. Factors affecting the time to achieve the TR (TtTR) are unknown. Methods: Prospective observational study including 1,406 nonvalvular AF patients starting VKAs followed for a mean of 31.3 months (3,690 patient/year); TiTR, TtTR, and SAMe-TT 2 R 2 score were calculated, and CVEs were recorded. Results: Median TtTR was 8.0 days (interquartile range 5.0-18.0).