Match each clinical scenario of severe or life-threatening bleeding to the most appropriat… — USMLE Step 2 CK

Match each clinical scenario of severe or life-threatening bleeding to the most appropriate specific pharmacological reversal agent.

A $65$ -year-old patient with a deep vein thrombosis develops severe hematemesis while receiving an unfractionated heparin infusion.Protamine sulfate
A $72$ -year-old patient with a mechanical aortic valve presents with an acute intracerebral hemorrhage; current INR is $5.8$ .Prothrombin complex concentrate
A $68$ -year-old patient taking a direct thrombin inhibitor for atrial fibrillation requires an emergent laparotomy for a perforated viscus.Idarucizumab
A $70$ -year-old patient taking a direct factor Xa inhibitor for pulmonary embolism prophylaxis presents with a massive retroperitoneal bleed.Andexanet alfa

Answer

Unfractionated heparin is reversed by protamine sulfate. Warfarin is reversed by prothrombin complex concentrate. Direct thrombin inhibitors (like dabigatran) are reversed by idarucizumab. Direct factor Xa inhibitors (like rivaroxaban) are reversed by andexanet alfa.

Each distinct class of anticoagulant medication interrupts the coagulation cascade via a unique mechanism, and therefore requires a highly specific antidote to quickly restore hemostasis in the setting of severe or life-threatening hemorrhage.

Step-by-Step Solution

Identify the specific anticoagulant medication or medication class used in each clinical scenario.

Scenario 1 involves unfractionated heparin; Scenario 2 involves a vitamin K antagonist (warfarin, implied by the elevated INR); Scenario 3 involves a direct thrombin inhibitor; Scenario 4 involves a direct factor Xa inhibitor.

Accurate identification of the anticoagulant is required to select the targeted reversal agent.

Match the identified anticoagulant with its specific pharmacologic reversal agent for severe bleeding.

Heparin pairs with protamine sulfate; warfarin pairs with prothrombin complex concentrate; direct thrombin inhibitors pair with idarucizumab; direct factor Xa inhibitors pair with andexanet alfa.

Each anticoagulant targets a distinct component of the coagulation cascade, necessitating a unique mechanism of reversal.

Key Concept

Pharmacologic Reversal of Anticoagulants

Estimated Time:1m 0s

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