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Postoperative exercise tolerance after aortic valve replacement by small-size prosthesis: functional consequence of
P Becassis1, M Hayot, J M Frapier
1Services de Cardiologie, Hopital Arnaud de Villeneuve, Montpellier, France.
Journal of the American College of Cardiology
|September 15, 2000
Summary
Small aortic valve prostheses do not appear to cause exercise intolerance. Maximal oxygen uptake (VO2max) was similar in patients and controls, indicating preserved exercise capacity after valve replacement.
Area of Science:
- Cardiovascular Surgery
- Exercise Physiology
- Prosthetic Valve Performance
Background:
- Exercise capacity after mechanical aortic valve replacement is not fully understood.
- Small valve prostheses have been linked to exercise intolerance.
- Maximal oxygen uptake (VO2max) is a key indicator of exercise tolerance.
Purpose of the Study:
- To investigate if small aortic valve prostheses lead to exercise intolerance.
- To assess exercise capacity using VO2 measurement during maximal exercise testing.
Main Methods:
- 14 patients (mean age 62) with small aortic prostheses (19-21 mm) were studied.
- Cardiorespiratory tests were performed one year post-surgery.
- Prosthetic valve gradients were measured at rest and post-exercise.
Main Results:
- No significant difference in peak oxygen uptake (VO2 peak) between patients and controls (21.7 vs. 20.4 ml/kg/min).
- Similar workloads and ventilatory parameters were observed.
- Valve gradients did not correlate with VO2max.
Conclusions:
- Small aortic valve prostheses do not seem to cause exercise intolerance in patients without pre-operative left ventricular ejection fraction (LVEF) dysfunction.
- Exercise capacity is maintained one year after implantation of small-sized aortic prostheses.