“PO28 | Long Term Effectiveness and Safety of Venous Thromboembolism With Fondaparinux: Data from the Start Registry: I.M. Palumbo1, E. Valeriani1,2, A. Pannunzio1, S. Marucci3, D. Menichelli1, D. Pastori3,4, P. Pignatelli3 | 1Department of General Surgery and Surgical Specialty, Sapienza University of Roma; 2Department of Infectious Disease, Azienda Ospedaliero-Universitaria Policlinico Umberto I, Roma; 3Department of Clinical Internal, Anaesthesiologic and Cardiovascular Sciences, Sapienza University of Roma, Roma; 4IRCCS NeuRomad, Pozzilli, Italy”. 2025. Bleeding, Thrombosis and Vascular Biology 4 (s1). https://doi.org/10.4081/btvb.2025.289.