PMC9236718_01
Serial INR and doses of vitamin K1 of the 15 y/o boy. He initially presented epistasis, gum bleeding, abdominal pain, and tarry stool. Poor compliance was noted between days 63 and 77. IV: intravenous route; PO: oral route.
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But, rebounding of INR and prolonged hospitalization were noted if we tried to taper the dose of vitamin K1 (Fig. 1).