Post-extraction bleeding on warfarin in a rural clinic
A 68-year-old man attends a single-chair rural practice for extraction of an unrestorable 46. He takes warfarin for atrial fibrillation; his INR was checked two days ago at the anticoagulation clinic and was 3.4 (target range 2.0-3.0). He reports no bleeding episodes, no recent antibiotic or NSAID use, and no alcohol excess. His last dose was last night. The nearest hospital with maxillofacial support is 90 minutes away by road, and the practice has no on-site INR testing. The dentist has 40 minutes of clinical time remaining and a second patient waiting. The tooth is mobile and the patient is keen to have it out today because he is travelling abroad in five days.
1. Should the extraction proceed today? Justify your decision using the information given.
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No - defer. The INR of 3.4 is above the therapeutic range and above the value at which most guidelines consider simple extractions acceptably safe (commonly an INR ≤3.0-3.5 depending on the guideline, but with a reading this far above target the safer action is to recheck and liaise with the anticoagulation clinic). Key reasoning:
- The reading is 48 hours old; INR can drift, and the patient may have had a dose change.
- The clinic has no ability to recheck INR or reverse anticoagulation on site, and definitive help is 90 minutes away.
- The patient is travelling in five days, which compresses any follow-up window if bleeding occurs.
- Nothing here is an emergency: the tooth is mobile but there is no infection, swelling, or airway concern described.
The correct plan is to contact the anticoagulation clinic, request a current INR, and reschedule once the INR is within the agreed range for extraction, with local haemostatic measures planned in advance. Document the discussion and the reason for deferral.
2. If the INR were subsequently confirmed at 2.8, outline the practical precautions you would take for the extraction in this setting.
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With a confirmed INR of 2.8 and no other risk factors, a simple extraction is generally reasonable without stopping warfarin, but the setting changes the risk calculus:
- Timing and setting: book a morning appointment early in the week so any bleeding problem occurs while services are open; ensure the patient can be observed and has someone to accompany them.
- Local measures: atraumatic technique, avoid excessive bone removal, place a haemostatic agent (e.g. oxidised cellulose or a collagen plug) and suture, then apply sustained pressure with a gauze pack for at least 10-20 minutes and confirm haemostasis before discharge.
- Antifibrinolytic: consider a tranexamic acid mouthwash regimen per local protocol if available.
- Instructions: written and verbal post-operative advice, no rinsing/suction for 24 hours, avoid NSAIDs, and clear instructions on when and how to seek help, including the 90-minute travel time to definitive care.
- Follow-up: telephone review the next day and a clinical review before he travels.
Document the INR value, the source of the reading, and the consent discussion covering bleeding risk.