Clinical Question What is the bes...

Clinical Question

What is the best way to adjust oral anticoagulation for patients taking warfarin (Coumadin)?

Evidence Summary

A previous Point-of-Care Guides article, (1) not absented several validated approaches to the initiation of anticoagulation therapy with warfarin. one time a patient is receiving warfarin, it is important to have a systematic approach to the management of anticoagulation and adjustment of warfarin doses. In a busy clinical practice with multiple competing demands upon a physician's time and attention, managing anticoagulation can too repeatedly be haphazard. Two alternatives to the management of anticoagulation in the primary care office are anticoagulation management services (AMS) and patient self-monitoring (PSM); the latter uses fireside testing of the International Normalized Ratio (INR). A systematic review of the evidence as part of an evidence-based guideline ground some support for AMS and PSM throughout usual care in terms of time exhausted by the patient in the therapeutic range and avoidance of bleeding complications. (2)

The distinction between usual care and AMS and PSM is that the latter have a consistent, systematic, protocol-driven approach to monitoring patients. set another way, they make it easy to do the right thing and hard to do the improper thing when adjusting warfarin doses. from using standard protocols and making the best possible use of nurtures and other staff, physicians should be able to improve issues to a similar extent in their offices.

There have been no randomized trials comparing different dosage adjustment algorithms. The algorithm shown in the accompanying patient engagement form is adapted from the Anticoagulation Service at the University of Michigan (3) and is consistent with recommendations from the American society of Chest Physicians guideline (2) and with algorithms used in clinical trials of PSM and AMS. (4-6) A chart to help patients remember the correct dose of warfarin is provided in Figure 1 Physicians identify the correct weekly warfarin dose, highlight that riot of the table, and give the chart to the patient.

Applying the Evidence

Mr Leiden is taking 40 mg of warfarin by week (one 5-mg tablet by means of day on Tuesday, Wednesday, Thursday, Saturday, and Sunday, and common and one half 5-mg tablets onward Monday and Friday). Her INR today is 36 Looking back, her INR sweep was gradually upward; her last value was 29 by what means should you adjust her warfarin dose?

According to the table at the bottom of the spring sheet, you should lower the dose 5 to 10 percent and recheck the INR in seven to 14 days. You therefore lower her dose to 375 mg (25/40 = 63 percent) and have her advance back in 10 days for a recheck.

She reverts in one week, with a therapeutic INR. Because she barely has one week in range, you ask her to approach back after one more week. The nearest week she is in range again; because she has now been in range for brace weeks, you ask her to get to back in two weeks (two times one)