Post-Extraction Bleeding in a Patient on Warfarin with an Elevated INR
A 70-year-old woman undergoes extraction of tooth 36. She takes warfarin for a mechanical aortic valve; her last INR was 3.8 (therapeutic range 2.0–3.0). The extraction was performed without checking INR on the day, and she now returns 6 hours later with persistent oozing from the socket despite biting on gauze. She is pale and anxious; blood pressure 150/90 mmHg, heart rate 96/min. The socket shows a clot but active oozing from the gingival margin. She reports no chest pain or shortness of breath. She asks whether she should stop warfarin.
1. Assess the immediate risk and outline your first-line management of the bleeding socket.
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Risk assessment
- INR 3.8 is supratherapeutic (above the 2.0–3.0 range for a mechanical aortic valve) → increased bleeding risk.
- Active oozing 6 h post-extraction with a clot present suggests local hemostatic failure, possibly compounded by the elevated INR.
- No chest pain/dyspnea → no immediate sign of thromboembolism, but the mechanical valve means warfarin must not be stopped without cardiology input.
First-line local management
- Reassure and seat the patient; monitor vital signs.
- Remove the old clot, irrigate, and apply firm pressure with moist gauze for 20–30 minutes.
- If still oozing: suture the socket, place a hemostatic agent (oxidized cellulose/gelatin sponge), and consider tranexamic acid mouthwash.
- Do not stop warfarin; instead, contact the prescriber/cardiology about the supratherapeutic INR.
- If bleeding is uncontrolled despite these measures → refer to emergency department for reversal (vitamin K/FFP) under medical supervision.
Bottom line: Control locally first; never unilaterally stop warfarin; escalate to the medical team for the high INR.
2. Explain the ethical and legal issues raised by performing the extraction without a current INR, and how you would document and communicate this.
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Ethical/legal issues
- Informed consent should include discussion of bleeding risk with anticoagulation; the patient should have been told about the need to check INR.
- Standard of care: For a patient on warfarin, checking INR before elective extraction (or coordinating with the prescriber) is generally expected; proceeding without it may be a departure from accepted practice.
- Duty of candor: If an error contributed to the complication, the dentist should disclose it honestly to the patient.
Documentation
- Record the INR value and date, the decision rationale, the consent discussion, and the post-operative course.
- Document the communication with the prescriber and advice given.
Communication
- Explain to the patient that her INR is above target and that this likely contributed to the bleeding.
- Clarify that she should not stop warfarin on her own and that the medical team will adjust it.
- Arrange follow-up and provide written post-op instructions.
Bottom line: Be transparent, document thoroughly, and involve the medical team; avoid repeating the omission.
3. What preventive measures should be built into future treatment planning for this patient?
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Pre-treatment
- Check INR within 24–72 h of the procedure and coordinate with the prescriber; for simple extractions, many guidelines allow continuation of warfarin if INR is within range.
- If INR is supratherapeutic, defer elective extraction until corrected.
- Plan for atraumatic technique, sutures, and hemostatic agents.
Intra-operative
- Minimize trauma; use sutures and topical hemostatics; consider tranexamic acid mouthwash.
Post-operative
- Written instructions: firm gauze pressure, avoid rinsing for 24 h, no smoking, soft diet.
- Follow-up call the next day; early review if bleeding recurs.
- Reinforce that warfarin should never be stopped without medical advice.
System improvement
- Add an anticoagulation checklist to the extraction workflow (INR date, prescriber contact, hemostasis plan).
Bottom line: Future care should include a documented INR check, coordination with the prescriber, and a structured hemostasis protocol.