Is it safe for a patient with four coronary artery bypass grafts and a recent coronary stent who is on dual antiplatelet therapy (aspirin 81 mg daily and clopidogrel 75 mg daily) to undergo a routine dental cleaning, and can we provide a letter confirming that no changes to his antiplatelet regimen are needed?

Routine Dental Cleaning on DAPT After CABG and Stent: Safe to Proceed

Yes, it is safe for this patient to undergo routine dental cleaning while continuing his dual antiplatelet therapy (aspirin 81 mg and clopidogrel 75 mg daily), and you can provide the requested clearance letter confirming no changes to his antiplatelet regimen are needed.

Key Rationale

The patient's CABG from a prior year and subsequent stent placement put him on mandatory DAPT. The critical issue here is that routine dental procedures, including cleanings, can be safely performed without interrupting antiplatelet therapy 1.

Why Continuing DAPT is Essential

• Stent thrombosis risk far outweighs bleeding risk: Premature discontinuation of DAPT after stent placement carries catastrophic consequences, including acute stent thrombosis, myocardial infarction, and death 2, 1
• DAPT duration requirements: After stent placement (whether bare-metal or drug-eluting), patients require at least 12 months of uninterrupted DAPT 3, 4
• Post-CABG considerations: Following CABG, aspirin should be continued indefinitely, and if the patient had a recent stent, DAPT must be maintained for the full recommended duration 3

Evidence for Dental Procedures on DAPT

The 2007 AHA/ACC/SCAI Science Advisory specifically addresses this scenario 1:

• No documented cases of clinically significant bleeding after dental procedures (including multiple extractions) in patients on dual antiplatelet therapy
• Local hemostatic measures are highly effective: Absorbable gelatin sponge and sutures easily control any minor bleeding during dental procedures
• Prospective data on aspirin: A randomized trial of single tooth extractions showed no statistically significant difference in postoperative bleeding between aspirin and placebo 1

Common Pitfall to Avoid

Many healthcare providers routinely instruct patients to stop "blood thinners" before procedures without distinguishing between anticoagulants (warfarin) and antiplatelet agents, or without evaluating the specific indication for therapy 1. This is inappropriate and dangerous for patients with coronary stents.

What to Include in the Clearance Letter

Your letter should state:

1. Patient is on medically necessary DAPT (aspirin 81 mg and clopidogrel 75 mg daily) following coronary artery bypass grafting and stent placement
2. Both medications must be continued without interruption for the dental cleaning
3. Routine dental cleaning poses minimal bleeding risk and can be safely performed with local hemostatic measures if needed
4. Stopping antiplatelet therapy would create unacceptable cardiovascular risk including potential stent thrombosis, myocardial infarction, or death

Additional Context

• For invasive dental procedures (extractions, periodontal surgery): The same principles apply—continue DAPT and use local hemostatic measures 1
• If significant bleeding occurs: It can be managed with local measures; the risk is far lower than the cardiovascular risk of stopping therapy
• Duration of DAPT: This patient should remain on DAPT for at least 12 months after his most recent stent placement 3, 4. After completing the required DAPT duration, he should continue aspirin indefinitely 5

The dentist's request for clearance is appropriate, but the answer is straightforward: proceed with the dental cleaning while the patient continues all antiplatelet medications.