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risk factors for persistently elevated INR

Risk factors for persistently elevated INR with warfarin therapy 1) lower weekly warfarin maintenance dose 2) older age 3) higher index (target) INR 4) decompensated congestive heart failure 5) cancer 6) superwarfarin (rat poison) [2]

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health risk factor(s)

References

  1. Journal Watch 21(21):168, 2001 Hylek et al Ann Intern Med 135:393, 2001
  2. NEJM Knowledge+ Hematology - Spahr JE, Maul JS, Rodgers GM. Superwarfarin poisoning: a report of two cases and review of the literature. Am J Hematol. 2007 Jul;82(7):656-60. PMID: 17022046 Free article. Review.