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Better anticoagulation control improves survival after valve replacement
Eric G Butchart1, Nicola Payne, Hui-Hua Li
1Department of Cardiothoracic Surgery, University Hospital of Wales, Cardiff, United Kingdom. egbutchart@aol.com
Summary
Poor anticoagulation control significantly reduces long-term survival after mechanical valve replacement. Optimizing international normalized ratio (INR) management is crucial for improving patient outcomes and longevity.
Area of Science:
- Cardiovascular Surgery
- Biomaterials Science
- Clinical Pharmacology
Background:
- Mechanical heart valves, such as the Medtronic Hall valve, require lifelong anticoagulation therapy.
- Maintaining therapeutic anticoagulation is challenging, with variability in international normalized ratio (INR) measurements being a common issue.
- The impact of anticoagulation control on long-term survival following Medtronic Hall valve replacement has not been fully elucidated.
Purpose of the Study:
- To assess the relationship between anticoagulation control variability and long-term survival after Medtronic Hall valve replacement.
- To identify predictors of reduced survival in patients with mechanical heart valves.
- To determine if improved anticoagulation management can enhance patient longevity.
Main Methods:
- Prospective collection of 82,297 INR measurements from 1476 patients undergoing single valve replacement with the Medtronic Hall valve (1979-1998).
- Exclusion of patients with early mortality or insufficient INR data, resulting in 10,203 patient-years of follow-up.
- Quantification of anticoagulation variability as the percentage of INR values outside the target range (2.0-4.0).
Main Results:
- Progressively increasing linearized late death rates with higher anticoagulation variability for both aortic and mitral valve replacements (P <.001).
- Significantly reduced 15-year survival rates with increasing anticoagulation variability for both aortic and mitral valve replacements (P <.001).
- Anticoagulation variability identified as the most significant independent predictor of reduced survival, surpassing factors like diabetes, age, and hypertension.
Conclusions:
- High anticoagulation variability is a critical independent predictor of decreased survival after mechanical valve replacement.
- Optimizing anticoagulation control, specifically minimizing INR variability, is essential for improving long-term patient survival.
- Achieving stable anticoagulation may lead to survival rates comparable to the general population for select patient groups.