Management of Thrombosed Mechanical Heart Valve

Diagnostic Evaluation and Treatment

• The American College of Cardiology recommends urgent treatment with either slow-infusion, low-dose fibrinolytic therapy or emergency surgery for patients with a thrombosed mechanical heart valve, with the choice determined by specific clinical factors including NYHA class, thrombus size, surgical risk, and available expertise 1
• Urgent multimodality imaging, including transthoracic echocardiography (TTE) and transesophageal echocardiography (TEE), is mandatory to assess valve function, leaflet motion, and thrombus burden 1, 2
• The American Heart Association suggests that fluoroscopy or CT imaging can be used to assess leaflet motion, particularly useful for aortic prostheses 2, 4

Treatment Decision Algorithm

• The American College of Cardiology favors emergency surgery for patients with NYHA class III-IV symptoms, large thrombus burden, mobile thrombus, readily available surgical expertise, recurrent valve thrombosis, contraindication to fibrinolysis, suspected pannus ingrowth, or concomitant coronary artery disease requiring revascularization 1, 4
• The American College of Cardiology favors fibrinolytic therapy for patients with NYHA class I-II symptoms, small thrombus burden, recent onset of symptoms, high or prohibitive surgical risk, no surgical expertise available, first-time episode of valve thrombosis, or no contraindications to fibrinolysis 1, 4

Fibrinolytic Therapy Protocol

• The American College of Cardiology recommends using slow-infusion, low-dose tissue plasminogen activator (tPA) 25 mg over 25 hours, with repeat dosing if needed, for fibrinolytic therapy 3
• The protocol has shown hemodynamic success rates >90%, embolic event rates <2%, and major bleeding rates <2% 1

Anticoagulation Management

• The American College of Cardiology recommends maintaining therapeutic INR throughout treatment, with a target INR of 2.5 for mechanical aortic valves and 3.0 for mechanical mitral valves 3, 6
• The American College of Cardiology advises against using direct oral anticoagulants (DOACs) in patients with mechanical valves, as they are contraindicated or not recommended 6

Post-Treatment Management

• The American College of Cardiology recommends optimizing long-term anticoagulation to prevent recurrence, including ensuring therapeutic INR maintenance with frequent monitoring and adding low-dose aspirin to warfarin for all mechanical valves 1, 6, 7