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Re-Examining the Recommended Follow-Up Interval after an In-Range INR Value: Results from the Veterans AffaiRs Study to Improve Anticoagulation (VARIA).
MedLine Citation:
PMID:  21310837     Owner:  NLM     Status:  Publisher    
ABSTRACT BACKGROUND: Patients receiving oral anticoagulation should be tested often enough to optimize control, but excessive testing increases burden and cost. We examined the relationship between the follow-up interval after an in-range (2.0-3.0) INR and anticoagulation control. METHODS: We studied 104,451 patients receiving anticoagulation from 100 anticoagulation clinics in the Veterans Health Administration (VA). Most patients (98,877) recorded at least one in-range INR followed by another INR within 56 days. For each such patient, we selected the last in-range INR and characterized the interval between this "index value" and the next INR. The independent variable was site mean follow-up interval after an in-range INR. The dependent variable was site mean risk-adjusted percent time in therapeutic range (TTR). RESULTS: Site mean interval varied from 25-38 days. As the mean site follow-up interval became longer, risk-adjusted TTR was worse (-0.51% per day, p = 0.004). This relationship persisted when the index value was the first consecutive in-range INR (-0.63%, p < 0.001), or the second (-0.58%, p < 0.001), but not the third or greater (-0.12%, p = 0.46). CONCLUSIONS: Sites varied widely regarding follow-up intervals after in-range INR (25-38 days). Shorter intervals were generally associated with better anticoagulation control, but after a third consecutive in-range value, this relationship was greatly attenuated and no longer statistically significant. Our results suggest that a maximum interval of 28 days after the first or second in-range value and consideration of a longer interval after the third or greater consecutive in-range value may be appropriate.
Adam J Rose; Al Ozonoff; Dan R Berlowitz; Arlene S Ash; Joel I Reisman; Elaine M Hylek
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-10
Journal Detail:
Title:  Chest     Volume:  -     ISSN:  1931-3543     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Center for Health Quality, Outcomes, and Economic Research, Bedford VA Medical Center, Bedford, MA;
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