Blood Thinner Recommendations for Valve Disease

Mechanical Heart Valves: Non-Negotiable Warfarin Therapy

The American College of Cardiology recommends warfarin as the only acceptable long-term anticoagulant for all mechanical valve patients, with a Grade 1B recommendation 4, 5, 6
For mechanical aortic valves, the American College of Chest Physicians recommends an INR target of 2.5 (range 2.0-3.0) for bileaflet or current-generation single-tilting disc valves without risk factors 5, 1
For mechanical mitral valves, the American College of Chest Physicians recommends an INR target of 3.0 (range 2.5-3.5) regardless of valve type 5, 6, 1
The American College of Cardiology states that DOACs (dabigatran, rivaroxaban, apixaban, edoxaban) are absolutely contraindicated in mechanical valve patients, with a Class III (Harm) recommendation 2, 3
Low-dose aspirin 50-100 mg daily should be added to warfarin in mechanical valve patients at low bleeding risk, with a Grade 1B recommendation 5, 6, 1

For surgical bioprosthetic mitral valves, the American College of Chest Physicians recommends warfarin with target INR 2.5 (range 2.0-3.0) for 3-6 months in patients at low bleeding risk 5, 6, 1
For surgical bioprosthetic aortic valves, the American College of Chest Physicians recommends aspirin 50-100 mg daily for the first 3 months 5, 6
After 3-6 months, the American College of Chest Physicians recommends aspirin 50-100 mg daily indefinitely for all bioprosthetic valves in patients without other indications for anticoagulation 5, 6, 1

The American College of Chest Physicians recommends warfarin with target INR 2.5 (range 2.0-3.0) for patients with atrial fibrillation or prior embolism, with a Grade 1A recommendation 4
The American College of Chest Physicians recommends warfarin with target INR 2.5 (range 2.0-3.0) for patients with left atrial thrombus, with a Grade 1A recommendation 4

For mitral valve repair with prosthetic band, the American College of Chest Physicians recommends aspirin therapy for the first 3 months, with a Grade 2C recommendation 5, 6
For aortic valve repair, the American College of Chest Physicians recommends aspirin 50-100 mg daily, with a Grade 2C recommendation 5, 6

The American College of Cardiology states that DOACs are contraindicated in mechanical valves, with a Class III (Harm) recommendation 2, 3
The American College of Cardiology recommends maintaining consistent INR targets, with a single target INR value rather than just stating a range 1, 8
Dedicated anticoagulation clinic management results in significantly lower complication rates than standard care, according to the American College of Cardiology 1, 8