To the Editor: Current Australian guidelines for urgent warfarin reversal recommend withholding warfarin, and giving vitamin K as well as factor replacement (Prothrombinex HT; PTX) with or without fresh frozen plasma (FFP).1 PTX administration without FFP is recommended only when FFP is unavailable, as PTX factor VII levels are low and unquantified.2 Transfusion of 25–50 IU/kg PTX and 150–300 mL of FFP is advised. We examined the effectiveness of warfarin reversal using PTX alone or combined with FFP.
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