DOAC management for extraction — ORE Part 1 MCQ

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HardOral SurgeryDOAC management for extractionORE Part 1

A 68-year-old patient taking apixaban for atrial fibrillation requires extraction of a mobile lower premolar. Renal function is normal and the procedure is expected to be low bleeding risk. The dentist is considering why local haemostatic planning is still needed. What is the most likely cause?

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Correct answer: B — Factor Xa inhibition reducing thrombin generation

Explanation lettering: D = shown as B · B = shown as C · C = shown as D

The correct answer is D. Apixaban is a direct factor Xa inhibitor that decreases thrombin generation and thrombus development. Even though the extraction is categorised as low-risk and renal function is normal, the anticoagulant effect remains clinically significant because thrombin generation is a fundamental step in clot formation. Local haemostatic measures are essential to compensate for the reduced thrombin-mediated fibrin formation and clot stability. Options A (aspirin mechanism) and B (warfarin mechanism) describe different anticoagulant classes. Option C (fibrinolysis) is unrelated to apixaban's action. Option E (calcium channel blockade) is inconsistent with apixaban's pharmacology.

Reference: Bristol-Myers Squibb/Pfizer ELIQUIS (apixaban) SmPC, Clinical Pharmacology Section 12.1; corroborated by Scottish Dental Clinical Effectiveness Programme (SDCEP) guidance on anticoagulants and antiplatelet drugs in dental practice (2023 edition), which emphasises that DOAC therapy requires local haemostatic support regardless of renal function or bleeding-risk categorisation. https://pubmed.ncbi.nlm.nih.gov/22722590/