Dual antithrombotic therapy and a high-risk mandibular third molar
A 61-year-old man with permanent atrial fibrillation is referred for removal of teeth 38 and 48. His medication list is apixaban 5 mg twice daily, bisoprolol, atorvastatin, and aspirin 81 mg, which he began himself after reading about stroke prevention; his cardiologist is abroad and unreachable. eGFR is 62 mL/min/1.73 m², platelets 210 × 10⁹/L, liver function normal, CHA₂DS₂-VASc 4, HAS-BLED 2. Tooth 38 is partially erupted and mesioangular, with roots whose apices overlap the mandibular canal on CBCT and no visible cortical separation on the lingual side. Tooth 48 is grossly carious with a 4-mm periapical radiolucency and no symptoms. He reports that a previous extraction 'bled for two days' and insists on having both teeth removed at a single visit under sedation, because he lives 300 km away and can travel only once. The clinic has no anaesthesia cover, no recovery bay, and no on-site access to blood products or reversal agents.
1. Set out your perioperative antithrombotic plan for apixaban and for the self-started aspirin, justifying each decision against his stroke and bleeding risks.
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Framing. There are two independent risks: thromboembolism if anticoagulation is interrupted, and haemorrhage if it is continued. With CHA₂DS₂-VASc 4 his untreated annual stroke risk is roughly 4–5%; a single missed DOAC dose adds almost nothing to that, whereas several days of interruption plus bridging adds real bleeding risk.
Apixaban. Surgical removal of two third molars with bone removal is a moderate-to-high local bleeding procedure. The defensible plan is to omit the morning dose on the day of surgery - apixaban's half-life is about 12 h and with eGFR 62 roughly three-quarters of the drug is eliminated in 24 h - and to restart 24 h post-operatively once haemostasis is secure. Do not stop it for 2–3 days, and do not bridge with low-molecular-weight heparin: in DOAC-treated patients bridging increases major bleeding without reducing stroke, and this clinic has no reversal agent. INR is not a valid monitor for apixaban, so checking it would be false reassurance.
Aspirin. Unprescribed aspirin added to a DOAC substantially increases procedural bleeding. Both teeth are non-urgent - 48 is asymptomatic and 38 is not infected - so the correct judgement is to defer surgery, contact his physician, and either stop aspirin 5–7 days pre-operatively or proceed only with a documented shared plan. Stopping a drug the patient believes protects him without that conversation is both clinically and medico-legally poor.
Local measures. Tranexamic acid 4.8% rinse four times daily for 5 days, atraumatic technique, primary closure, haemostatic dressing, paracetamol rather than NSAIDs, written instructions with a contact number, and - given the 300 km journey - a plan to stay locally for 48 h.
2. For each of the two teeth, state which operation you would perform and defend the choice, including the consent points specific to that operation.
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Tooth 38 - coronectomy. The decisive finding is radiographic overlap of the root apices with the mandibular canal without visible lingual cortical separation, in a partially erupted, mesioangular, symptom-free, vital tooth with no periapical pathology. In that setting coronectomy reduces the risk of permanent inferior alveolar nerve injury from the order of 5–8% for extraction to well under 1%, because the roots are left in situ and no elevation is applied at the apex.
The prerequisites must be checked explicitly: no active infection, no apical radiolucency, tooth not mobile, roots not ankylosed, and a patient who accepts the residual root and the follow-up. Technique matters - section the crown 3–4 mm below the cemento-enamel junction, do not attempt to retrieve the pulp or the root stump, and close primarily. Consent must cover root migration (usually slowly, and often asymptomatic), the small risk of re-operation for eruption or infection, and the need for radiographs at 12 months. If the roots are mobilised during sectioning, they must be removed and the plan converts to extraction with its nerve risk.
Tooth 48 - extraction. It is grossly carious with a periapical radiolucency, so it is infected and non-restorable; coronectomy is contraindicated in infected teeth, and there is no reason to preserve roots that are themselves the source of pathology. Because the periapical lesion lies at the apex, its removal carries its own nerve risk, which must be discussed separately and documented.
Do not treat both teeth with the same operation simply because they are in the same quadrant.
3. The patient refuses a staged plan and demands both extractions plus sedation at this visit. How do you manage consent, safety and the geographic constraint?
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The clinical plan cannot be set by the patient's travel distance. Sedation in a facility without anaesthesia cover, monitoring, a recovery area and airway rescue capability breaches patient-safety standards regardless of the patient's preference; sedation is not a substitute for missing infrastructure. His request is understandable but the answer is a negotiated alternative, not compliance.
Offer real options. (1) Tooth 48, which is infected, can be removed now under local anaesthesia with the DOAC omitted that morning and local haemostatic measures - treating the pathology without touching the high-risk tooth. (2) Tooth 38 can be managed at a later visit, ideally at a hospital where anaesthesia support exists, so that the coronectomy is done under optimal conditions. (3) Refer the whole case to a maxillofacial unit nearer his home if travel is genuinely impossible; that is a legitimate outcome, not a failure.
Consent content. Document discussion of temporary (5–8%) and permanent (~1%) inferior alveolar and lingual nerve injury, bleeding on apixaban, dry socket, root retention and revision surgery, and the alternative of referral. Record that he was advised about staying locally for 48 h and that he declined a staged approach.
Do not allow the 300 km journey to justify a faster, riskier operation; if he leaves against advice, document it, give written warning signs, and ensure a route back to care. The professional duty is to protect him from a decision made under logistical pressure.