mrcem2-2200

You evaluate a 45-year-old woman with a swollen and red left calf and thigh. Her D-dimer level is elevated, and you schedule an ultrasound examination, which shows a proximal vein clot (DVT). She has no significant medical history and no known drug allergies.
According to the current NICE guidelines, which anticoagulant is recommended as the initial treatment for DVT?