Bleeding After Extraction in a Patient on Anticoagulants
A 62-year-old woman has an emergency extraction of a grossly carious, mobile lower left second molar at a rural clinic. Her history includes atrial fibrillation, for which she takes warfarin, and hypertension on amlodipine. Her most recent INR, taken 5 days ago, was 3.4 (target range 2.0–3.0). She did not disclose the warfarin on the intake form because she did not consider it a 'real medicine'. The extraction is completed with a buccal flap and one suture; the socket is packed with a hemostatic agent. Thirty minutes later she is still oozing; her blood pressure is 158/96 mmHg and pulse 88. The clinic has no on-site laboratory and closes in 2 hours.
1. Identify the factors contributing to the persistent bleeding and rank them by how much they can be modified in this clinic.
Read the worked answer
Contributors
- Supratherapeutic anticoagulation - INR 3.4 exceeds the 2.0–3.0 target for atrial fibrillation. This is the dominant systemic factor and cannot be corrected on site.
- Undisclosed medication history - the intake failure means the operator proceeded without a plan; this is a process failure, not a patient fault, and must be addressed for future visits.
- Elevated blood pressure (158/96) - raises local perfusion pressure and impedes clot stability; partially modifiable.
- Local surgical factors - a flap and a single suture may not provide adequate compression; hemostatic packing may be insufficient or poorly retained. Fully modifiable here.
- Patient behavior - talking, rinsing, or disturbing the socket; modifiable with clear instructions.
Ranking by modifiability in this clinic: local measures and blood pressure first (fully or partly controllable), then patient instructions, with the INR last (not modifiable without laboratory and physician input). This ordering drives the plan: exhaust local control before considering any change to anticoagulation, which is a physician decision.
2. Describe the stepwise local and systemic management you would carry out, and state the criteria that would make you refer her urgently rather than continue locally.
Read the worked answer
Stepwise management
- Reassure and seat the patient upright; check for syncope risk.
- Remove the old pack, irrigate gently, and place a fresh absorbable hemostatic agent plus a pressure pack; have her bite firmly on gauze for 20–30 minutes without releasing.
- If oozing persists, infiltrate local anesthetic with a vasoconstrictor around the socket, place additional sutures to approximate the margins over the pack, and consider a tranexamic acid mouthwash soak as an adjunct.
- Recheck blood pressure; if still elevated, arrange same-day medical review for hypertension rather than adjusting her own medication.
- Give written and verbal aftercare: no rinsing, spitting, smoking, hot drinks, or straws for 24 hours; soft diet; sleep with the head elevated; return immediately if bleeding restarts.
Do not stop or alter warfarin yourself - that is the prescriber's decision and carries thromboembolic risk in atrial fibrillation.
Refer urgently if: bleeding cannot be controlled after two rounds of local measures, there is brisk arterial-type bleeding, she becomes pale, dizzy, or tachycardic, or there is expanding hematoma or airway concern. In that case, apply sustained pressure, transfer to a facility with laboratory and medical support, and contact her anticoagulation clinic. Also document the medication-history failure and build a structured medication checklist into intake.