The nurse notes in the patient’s medication orders that the patient will be starting anticoagulant therapy. What is the primary goal of anticoagulant therapy?

Choice A reason: Calcium gluconate treats hypocalcemia or hyperkalemia, not heparin overdose. Heparin enhances antithrombin, prolonging clotting time, causing bleeding. Calcium does not reverse this anticoagulant effect, making it an incorrect choice for managing profuse bleeding in a patient on heparin therapy.

Choice B reason: Protamine sulfate is the antidote for heparin, binding to it and neutralizing its anticoagulant effect, rapidly reversing bleeding. In a trauma patient with profuse bleeding, this is critical to restore clotting and prevent hypovolemic shock, making it the most likely medication to administer.

Choice C reason: Enoxaparin, a low-molecular-weight heparin, is an anticoagulant, not an antidote. Administering it would worsen bleeding in a patient already on heparin. Protamine sulfate is needed to reverse heparin’s effect, making enoxaparin an incorrect choice for this emergency scenario.

Choice D reason: Vitamin K reverses warfarin, not heparin, by promoting clotting factor synthesis. Heparin’s immediate anticoagulant effect requires protamine sulfate for rapid neutralization. Vitamin K is ineffective in this context, making it an incorrect choice for managing acute bleeding in a heparinized patient.

Choice A reason: An elevated platelet count does not indicate warfarin overdose, which prolongs clotting time by inhibiting vitamin K-dependent factors, not platelet function. Normal or low platelets may cause bleeding, but INR is the key indicator, making this incorrect for assessing overdose.

Choice B reason: Elevated aPTT reflects heparin’s effect, not warfarin, which primarily affects prothrombin time and INR. While bleeding may occur, aPTT is not the primary test for warfarin overdose, making this incorrect, as INR directly monitors warfarin’s anticoagulant effect and overdose risk.

Choice C reason: An elevated lipid panel is unrelated to warfarin overdose, which causes bleeding by inhibiting clotting factors. Lipid levels affect atherosclerosis, not coagulation, making this incorrect, as INR is the specific test to assess warfarin’s therapeutic and overdose effects in bleeding patients.

Choice D reason: An elevated INR level indicates warfarin overdose, as warfarin inhibits vitamin K-dependent clotting factors, prolonging prothrombin time and increasing bleeding risk like bruising and nosebleeds. Monitoring INR is critical, making this the correct test to identify overdose in this patient.