Assessing the Ability of Warfarin Treated Patients to Predict Their INR
Study Details
Study Description
Brief Summary
ASSESSING THE ABILITY OF WARFARIN TREATED PATIENTS TO PREDICT THEIR INR Kathleen McNamara, James Hoehns, Matthew Witry
The international normalized ratio (INR) is the accepted lab test used to measure the intensity of warfarin effect. The conventional wisdom is that patients receiving warfarin are unable to correctly determine, in the absence of an INR result, whether or not they are therapeutic at any given time. Some warfarin treated patients express that they have insight into what their INR result will be. Various patient related factors may contribute to these opinions.
Our objective is to assess how accurately patients can guess their INR result before it is obtained and to describe factors which inform their opinion of what their INR will be.
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Detailed Description
ASSESSING THE ABILITY OF WARFARIN TREATED PATIENTS TO PREDICT THEIR INR Kathleen McNamara, James Hoehns, Matthew Witry
The international normalized ratio (INR) is the accepted lab test used to measure the intensity of warfarin effect. The conventional wisdom is that patients receiving warfarin are unable to correctly determine, in the absence of an INR result, whether or not they are therapeutic at any given time. Some warfarin treated patients express that they have insight into what their INR result will be. Various patient related factors may contribute to these opinions.
Our objective is to assess how accurately patients can guess their INR result before it is obtained and to describe factors which inform their opinion of what their INR will be. In this prospective study, the investigators will enroll warfarin treated patients from 7 anticoagulation clinics in Iowa. Inclusion criteria are: age ≥18 years, warfarin use ≥60 days, INR goal of 2.0-3.0 or 2.5-3.5, expected warfarin use >6 months, and English speaking. Exclusion criteria include: use of self INR-testing, home INR draws, dementia, or residing in a long-term care facility. A data collection form will be completed prior to INR measurement for a 6 month period. Information will be collected for subject demographics, warfarin adherence, INR stability, INR prediction, and prediction rationale.
INR monitoring represents a significant burden with respect to cost and time. The results of this study may identify patient factors which could help individualize and decrease the frequency of INR monitoring in patients who receive maintenance warfarin therapy.
Study Design
Outcome Measures
Primary Outcome Measures
- Assess factors which influence INR predictions [6 months]
Patients will be asked to predict their INR value prior to having it tested. We will record patient's INR prediction and the value we obtain after testing INR.
Eligibility Criteria
Criteria
Inclusion Criteria:
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Age ≥18 years
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Warfarin use ≥60 days
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INR goal of 2.0-3.0 or 2.5-3.5
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Expected warfarin use >6 months
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English speaking
Exclusion Criteria:
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Self INR-testing
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Home INR draws
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Dementia
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Residence of a long-term care facility
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Northeast Iowa Family Practice | Waterloo | Iowa | United States | 50702 |
Sponsors and Collaborators
- Northeast Iowa Medical Education Foundation
- University of Iowa
Investigators
None specified.Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- 914