Clinical Characteristics and Outcomes of Venous Thromboembolisms According to an Out-of-Hospital vs. In-Hospital Onset ― From the COMMAND VTE Registry ―

BACKGROUND: Differences in the clinical characteristics and outcomes of venous thromboembolisms (VTEs) based on different clinical situations surrounding the onset might be important for directing appropriate treatment strategies, but have not yet been appropriately evaluated. Methods and Results: The COMMAND VTE Registry is a multicenter registry enrolling 3,027 consecutive patients with acute symptomatic VTEs in Japan between January 2010 and August 2014. We divided the study population into 3 groups: Out-of-hospital onset (n=2,308), In-hospital onset with recent surgery (n=310), and In-hospital onset without recent surgery (n=374). Active cancer was most prevalent in the In-hospital onset without recent surgery group, and least in the Out-of-hospital onset group (Out-of-hospital onset group: 20%, In-hospital onset with recent surgery group: 26%, and In-hospital onset without recent surgery group: 38%, P<0.001). The cumulative 5-year incidence of recurrent VTEs did not significantly differ across the 3 groups (11.4%, 5.8%, and 8.7%, respectively; P=0.11). The cumulative 5-year incidences of major bleeding and all-cause death were highest in the In-hospital onset without recent surgery group (11.1%, 8.5%, and 23.3%, P<0.001; 26.8%, 24.9%, and 48.4%, P<0.001, respectively). CONCLUSIONS: In the real-world VTE registry, the clinical characteristics and long-term outcomes substantially differed according to the clinical situation of VTE onset, suggesting the need for different treatment strategies for VTEs in different clinical settings.