A patient on an anticoagulant requesting a scale and polish before surgery
A 60-year-old woman attends for routine scaling. She has a mechanical mitral valve and takes warfarin (INR 2.6, checked yesterday, within her target range). She also has a history of infective endocarditis five years ago. She has generalised moderate periodontitis with bleeding on probing and requests a "full clean". She mentions she is having a cataract operation in three weeks and asks whether she needs to stop her warfarin beforehand. She is otherwise well and has no allergies.
1. Does she need antibiotic prophylaxis for the scaling? Justify your answer.
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No - not for routine scaling. Current guidance (NICE in the UK, and consistent with other bodies for routine care) does not recommend antibiotic prophylaxis for routine dental procedures, including scaling, in patients with prosthetic valves or a history of infective endocarditis. The reasoning:
- The risk of antibiotic-related harm (anaphylaxis, C. difficile, resistance) is considered to outweigh the small benefit for routine procedures.
- Prophylaxis is reserved, where recommended at all, for higher-risk procedures in the highest-risk patients, and even then guidance varies - so the correct action is to follow local/national policy and document it.
- However: her history of endocarditis and mechanical valve make her high risk if she does develop bacteraemia, so excellent oral hygiene and periodontal treatment are important - good plaque control reduces the frequency of bacteraemia more than a single antibiotic dose.
Explain this to the patient, and note that if she is anxious about it, the discussion and the guideline followed should be documented.
2. What would you advise about her warfarin before the cataract operation, and how does that affect your scaling today?
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Advice on warfarin: do not advise her to stop or alter warfarin herself. Decisions about perioperative anticoagulation for cataract surgery are made by her anticoagulation clinic, cardiologist, and the operating surgeon. Cataract surgery is generally low bleeding risk and many patients continue warfarin, but that is not the dentist's call. The correct action is to tell her to raise it with the team managing her anticoagulation and the ophthalmology team, and not to change her dose on her own.
Effect on scaling today:
- Her INR is 2.6 and within range, so routine scaling with attention to haemostasis is reasonable; avoid excessive trauma and confirm bleeding settles.
- If she were to have a change in anticoagulation around the eye operation, that would be a reason to coordinate timing of any more invasive periodontal treatment, but a scale and polish today is unaffected.
- Document the INR, the date checked, and the advice given.
Safety-netting: advise her to seek help if bleeding does not stop, and to inform the anticoagulation clinic of any dental treatment.