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Primary isolated aortic valve replacement. Early and late results
B W Lytle1, D M Cosgrove, P C Taylor
1Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic Foundation, Ohio 44195.
Summary
This study on aortic valve replacement found that patient factors like age and kidney function impact survival. Bioprosthetic valves offer better long-term outcomes, especially for older patients, but require careful management.
Area of Science:
- Cardiac Surgery
- Cardiovascular Research
- Prosthetic Valve Outcomes
Background:
- Isolated aortic valve replacement (AVR) is a critical procedure for patients with aortic valve disease.
- Understanding long-term outcomes and influencing factors is essential for optimizing patient care.
- Previous studies have explored various aspects of AVR, but comprehensive analysis of long-term survival and event-free survival based on patient and management variables is ongoing.
Purpose of the Study:
- To evaluate the 10-year survival and event-free survival rates after isolated aortic valve replacement.
- To identify patient-related and management-related variables associated with in-hospital and late mortality.
- To compare the outcomes of bioprosthetic versus mechanical valves in different age groups.
Main Methods:
- Retrospective analysis of 1689 consecutive patients undergoing isolated AVR between 1972 and 1986.
- Multivariate analysis to identify independent predictors of in-hospital mortality.
- Long-term follow-up to assess survival and event-free survival rates, stratified by valve type and patient age.
Main Results:
- In-hospital mortality was 3.4%, with advanced age, elevated blood urea nitrogen, NYHA class, and atrial fibrillation as independent predictors of increased mortality.
- Cardioplegia use was associated with decreased mortality. Ten-year survival and event-free survival rates were 66% and 43%, respectively.
- Bioprosthetic valves showed superior survival and event-free survival, particularly in patients aged 40 and older, but were associated with more reoperations and endocarditis. Mechanical valves had higher rates of stroke, myocardial infarction, and thromboembolic events.
Conclusions:
- Ten-year outcomes after isolated AVR are significantly influenced by patient characteristics (age, renal function, cardiac status) and management strategies (valve choice, myocardial protection).
- Bioprosthetic valves offer a survival advantage for older patients (≥40 years), while younger patients may face more reoperations and endocarditis.
- Mechanical valves are associated with a higher risk of thromboembolic complications, necessitating careful consideration of anticoagulation management and patient selection.