Patients are considered to be low risk patients when they have had one isolated arterial or venous thromboembolic episode of more than six months duration, atrial fibrillation without valvular disease, and a mechanical valve or bioprosthetic aortic valve.
Se consideran de bajo riesgo pacientes con un episodio tromboembólico arterial o venoso aislado de más de seis meses de evolución, fibrilación auricular sin enfermedad valvular, válvula mecánica aórtica o bioprotesis valvular.