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Published on: February 28, 2012
Freedom from thromboembolism despite prolonged inadequate anticoagulation
Frank Edwin1, Mark Mawutor Tettey, Ernest Aniteye
1National Cardiothoracic Centre, Korle Bu Teaching Hospital, PO Box KB 846, Korle Bu, Accra, Accra, KB 846, Ghana.
BMJ Case Reports
|September 16, 2011
Summary
Two patients with mechanical mitral valves achieved therapeutic anticoagulation late post-surgery. Despite prolonged suboptimal anticoagulation, neither experienced thromboembolism or valve issues, highlighting potential resilience in select mechanical heart valve recipients.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Biomaterials Science
Background:
- Mechanical heart valve replacement necessitates lifelong anticoagulation to prevent thromboembolism.
- Achieving and maintaining therapeutic anticoagulation (target INR 2.5-3.5) can be challenging postoperatively.
- Third-generation bi-leaflet valves are designed for improved hemodynamic performance and durability.
Purpose of the Study:
- To report on two cases of mechanical mitral valve replacement where therapeutic anticoagulation was significantly delayed.
- To investigate the clinical outcomes in patients with mechanical heart valves experiencing prolonged periods of suboptimal anticoagulation.
- To review the phenomenon of successful outcomes despite delayed anticoagulation in mechanical heart valve recipients.
Main Methods:
- Case report of two patients undergoing mechanical mitral valve replacement with third-generation bi-leaflet valves.
- Detailed monitoring of oral anticoagulation therapy and international normalized ratio (INR) levels postoperatively.
- Clinical follow-up for thromboembolic events, valve-related complications, and overall patient health.
Main Results:
- Patient 1 achieved target INR (2.5-3.5) at 53.5 months post-surgery, despite good compliance.
- Patient 2 achieved target INR at 16.9 months post-surgery with regular monitoring.
- Neither patient experienced thromboembolism or any valve-related adverse events during 8 and 5 years of follow-up, respectively.
Conclusions:
- Mechanical heart valves, particularly third-generation bi-leaflet types, may offer a degree of protection against thromboembolism even with delayed therapeutic anticoagulation.
- These cases suggest that prolonged periods of suboptimal anticoagulation might be tolerated in select patients without adverse sequelae.
- Further investigation into the factors influencing thromboembolic risk in patients with mechanical heart valves and suboptimal anticoagulation is warranted.
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