Resident Dentist Facing Extraction With Supratherapeutic INR
A second-year resident dentist in a Nebraska hospital-based dental clinic is covering Saturday morning. A 68-year-old woman presents with a nonrestorable tooth #19, moderate pain, and no swelling. Her medical history includes a mechanical mitral valve, atrial fibrillation, warfarin, and aspirin 81 mg. Her INR drawn yesterday is 3.8. The oral surgery attending is at a conference and cannot be reached for two hours. The resident holds a limited license and usually performs extractions under direct supervision. The patient says, 'Just pull it-I can't afford to miss work.' The resident plans a simple extraction with local anesthetic, tranexamic acid mouth rinse, and pressure, and asks the assistant to prepare a consent form that says 'extraction, risks explained.' The clinic has no on-site physician. The resident wonders whether the extraction can proceed, what consent requires, and what to document.
1. Can the resident proceed with the extraction? Analyze supervision, scope, and medical risk.
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The resident should not proceed with an elective extraction while the INR is 3.8 and the attending is unavailable. The patient is anticoagulated for a mechanical mitral valve; interrupting warfarin without cardiology input risks valve thrombosis, while extracting at a supratherapeutic INR risks prolonged bleeding. The resident's limited license generally requires supervision at a defined level; a Saturday clinic with the attending offsite does not automatically create direct supervision. The resident must know the supervision level for the procedure and whether the state allows a resident to perform it independently. The safer course is to contact the attending by phone or another qualified supervising dentist, contact the patient's cardiologist or anticoagulation clinic, and document the attempts. If the patient has only moderate pain and no swelling, the extraction can be delayed until INR is within an acceptable range and a plan is confirmed. If there is urgent infection or airway compromise, arrange emergency transfer. The resident should not let the patient's financial or work concerns override medical risk. The legal issue is both scope and supervision and standard of care.
2. What should valid informed consent and documentation include in this situation?
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Valid informed consent requires a discussion of the diagnosis, the proposed extraction, alternatives such as root canal, referral, or delay, and material risks, including bleeding, infection, dry socket, nerve injury, and the possibility of transfusion or hospitalization if bleeding is uncontrolled. The form saying 'extraction, risks explained' is not sufficient by itself; it is evidence of consent, not a substitute for the conversation. The resident should assess the patient's capacity and whether she understands the anticoagulation risk. If the resident cannot obtain supervision or medical clearance, the consent should reflect the plan actually offered, such as referral or delay. Documentation should include the INR, medication list, cardiology contact attempts, supervising dentist communication, risks discussed, patient questions, the decision, and follow-up. If the patient refuses a safe plan, document the refusal and the warnings given. The resident should avoid having an assistant prepare a generic consent form without the resident's involvement. The reasoning is that consent must be procedure-specific, risk-specific, and obtained by someone with the authority and knowledge to answer questions.