Correcting excess anticoagulation after warfarin
- Karen A Valentine, MD, PhD
Karen A Valentine, MD, PhD
- Associate Clinical Professor
- University of Calgary, Canada
- Russell D Hull, MBBS, MSc
Russell D Hull, MBBS, MSc
- Professor of Medicine
- University of Calgary, Canada
Warfarin is used in a variety of clinical settings; its clinical effect is monitored through a standardized prothrombin time, termed the International Normalized Ratio (INR). The optimal method for correcting excess anticoagulation after the use of warfarin (eg, returning an increased INR to the desired range) depends upon the degree of elevation and whether clinically significant bleeding is present [1-3], and will be discussed here.
Management of intracerebral hemorrhage as a complication of anticoagulation with warfarin is discussed separately. (See "Reversal of anticoagulation in warfarin-associated intracerebral hemorrhage".)
Correction of excess anticoagulation in patients with prosthetic heart valves is discussed separately. (See "Antithrombotic therapy in patients with prosthetic heart valves".)
The clinical use of warfarin, including its biological properties, mechanism of action, laboratory monitoring, and complications is discussed in detail separately. (See "Therapeutic use of warfarin and other vitamin K antagonists".)
Patients treated with warfarin frequently become excessively anticoagulated, even those who have been stable for many months. The most common causes are interactions between warfarin and other drugs and superimposed diseases (eg, liver disease, malabsorption) that may interfere with warfarin ingestion, absorption, or metabolism. (See "Therapeutic use of warfarin and other vitamin K antagonists", section on 'Drug interactions'.)
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- RISK FACTORS
- Medical causes
- Vitamin K deficiency
- Falsely elevated INRs
- INR <5 without bleeding
- INR 5 to 9 without bleeding
- - Stopping warfarin
- - Stopping warfarin plus oral vitamin K
- - Route of vitamin K
- - Acenocoumarol
- INR >9 without bleeding
- Elevated INR with minimal bleeding
- Significant or life-threatening bleeding
- Vitamin K formulations
- SPECIAL POPULATIONS
- Mild head trauma
- - Evaluation
- - Management
- Intracerebral bleeding
- Surgery/invasive procedure
- Prosthetic heart valve
- Superwarfarin poisoning
- ACCP GUIDELINES
- INFORMATION FOR PATIENTS
- SUMMARY AND RECOMMENDATIONS