Figure 1. Daily INR level and treatment regimen while hospitalized. INR on admission was extrapolated from aPPT levels. Initial treatment utilized intravenous and oral vitamin K, reduced to oral vitamin K supplementation alone on day 5, with intermittent infusions. He refused the dose on day 12. Patient was discharged on day 21. He returned to the emergency room on day 27. BT: blood transfusion; IV: intravenous vitamin K1; PO: oral vitamin K1; HD: hospital day; INR: international normalized ratio.