RT Journal Article T1 Rivaroxaban Monotherapy in Patients with Pulmonary Embolism: Off-Label vs. Labeled Therapy. A1 Di Micco, Pierpaolo A1 Salazar, Vladimir Rosa A1 Capitan, Carmen Fernandez A1 Dentali, Francesco A1 Cuervo, Covadonga Gomez A1 Torres, Jose Luis Fernandez A1 Porras, Jose Antonio A1 Fidalgo, Angeles A1 Grandone, Elvira A1 Meseguer, Manuel Lopez A1 Monreal, Manuel A1 The Riete Investigators, K1 DOACs K1 RIETE K1 oral anticoagulants K1 rivaroxaban K1 venpus thromboembolism AB Background: The use of rivaroxaban in clinical practice often deviates from manufacturer prescribing information. No studies have demonstrated an association between this practice and improved outcomes. Methods: We used the RIETE registry to assess the clinical characteristics of patients with pulmonary embolism (PE) who received off-label rivaroxaban, and to compare their 3-month outcomes with those receiving the labeled therapy. The patients were classified into four subgroups: (1) labeled therapy; (2) delayed start; (3) low doses and (4) both conditions. Results: From May 2013 to May 2022, 2490 patients with PE received rivaroxaban: labeled therapy—1485 (58.6%); delayed start—808 (32.5%); low doses—143 (5.7%); both conditions—54 (2.2%). Patients with a delayed start were more likely to present with syncope, hypotension, raised troponin levels and more severe abnormalities on the echocardiogram than those on labeled therapy. Patients receiving low doses were most likely to have cancer, recent bleeding, anemia, thrombocytopenia or renal insufficiency. During the first 3 months, 3 patients developed PE recurrence, 4 had deep-vein thrombosis, 11 had major bleeding and 16 died. The rates of major bleeding (11 vs. 0; p SN 2075-1729 YR 2022 FD 2022-07-27 LK http://hdl.handle.net/10668/21400 UL http://hdl.handle.net/10668/21400 LA en DS RISalud RD Apr 18, 2025