Prolonged International Normalized Ratio During the First Year of Warfarin Treatment

Patients who are admitted with INR > 4 during the 1st year of OAC therapy are overanticoagulated for a longer period, have lower time in therapeutic range, but do not present with higher incidence of bleeding events, all compared with patients treated for longer than 12 months. Stricter INR monitoring and careful patient selection may prevent the discontinuation of OAC.