Quality improvement in an anticoagulation clinic: development of a new treatment protocol.

We sought to improve patient outcomes and efficiency in our anticoagulation clinic through development of a new protocol for managing heart valve patients with subtherapeutic international normalized ratio (INR) tests. The new protocol standardized use of 1 anticoagulation agent while warfarin was retitrated, timelines for INR retesting, and target INR levels depending on the type of valve implanted. The new protocol provided significant improvements in patient care; however, outcomes for clinic operating efficiency were mixed.