Bleeding risk in warfarinized patients with a therapeutic international normalized ratio: the effect of low factor IX levels.

Journal Article (Journal Article)

OBJECTIVE: Bleeding is the main complication of warfarin therapy, even patients with an international normalized ratio (INR) in the target range can suffer bleeding, suggesting that INR does not perfectly reflect the therapeutic effect of warfarin. We hypothesized the INR might underestimate the level of anticoagulation in a subject with a lower factor (F) IX level than average. METHODS AND RESULTS: We modeled warfarin anticoagulation in our in vitro thrombin generation (TG) model by adjusting the levels of vitamin K-dependent factors to those of patients with an INR of 2-3. Variation in FIX had a marked effect on TG but had no effect on the prothrombin time (PT)-INR. A prospective observational, cross-sectional clinical study including 341 consecutive patients admitted to the emergency department with an INR between 2 and 3, showed a statistically lower FIX activity in bleeders (P = 0.004) compared with others. No correlation was found between TG capacity and PT-INR results (P = 0.36). However, in patients, presenting with a warfarin-related hemorrhage, TG was significantly lower (P < 0.001) than others. A correlation on the boundary of significance was observed between TG capacity and FIX levels (P = 0.09). CONCLUSION: These data demonstrates that patients who bleed when their PT-INR is in the target range 2-3 might have defective TG related to a lower level of FIX than expected.

Full Text

Duke Authors

Cited Authors

  • Dargaud, Y; Hoffman, M; Lefrapper, L; Lin, F-C; Genty, A; Chatard, B; Marin, S; Négrier, C; Monroe, DM

Published Date

  • June 2013

Published In

Volume / Issue

  • 11 / 6

Start / End Page

  • 1043 - 1052

PubMed ID

  • 23581252

Electronic International Standard Serial Number (EISSN)

  • 1538-7836

Digital Object Identifier (DOI)

  • 10.1111/jth.12244


  • eng

Conference Location

  • England