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Effect of aortic valve replacement on the left ventricle. A ciné-angiographic evaluation
Insights
Aortic valve replacement with the Björk-Shiley valve significantly improves heart function in patients with aortic valve disease. This surgery normalizes cardiac performance and hemodynamics, offering a viable solution for disturbed left ventricular function.
Area of Science:
- Cardiology
- Cardiac Surgery
- Biomedical Engineering
Background:
- Aortic valve disease significantly impairs left ventricular (LV) function and hemodynamics.
- Surgical intervention is often necessary to restore normal cardiac performance.
- The Björk-Shiley tilting disc valve is a prosthetic option for aortic valve replacement.
Purpose of the Study:
- To evaluate the hemodynamic and functional outcomes after aortic valve replacement (AVR) using the Björk-Shiley valve.
- To assess the impact of AVR on left ventricular performance in patients with severe aortic valve disease.
- To compare pre-operative and post-operative cardiac data with a control group.
Main Methods:
- Retrospective analysis of heart catheterization and quantitative left ventricular cine-angiography data.
- Comparison of pre-operative and 12-month post-operative data in 30 patients.
- Inclusion of a control group of 22 patients without organic heart disease.
- Assessment using the New York Heart Association (NYHA) functional classification.
Main Results:
- Significant improvement in LV stroke work relative to end-diastolic volume and myocardial mass (p < 0.001).
- Marked reductions in end-diastolic volume (p < 0.001), pump power (p < 0.001), and myocardial mass (p < 0.001).
- Regurgitation corrected in 27 patients; pressure gradient reduced, though the valve introduced a 5-35 mmHg gradient.
Conclusions:
- Aortic valve replacement with the Björk-Shiley valve is effective in normalizing cardiac function and hemodynamics.
- The procedure demonstrates significant benefits for patients with disturbed left ventricular performance.
- AVR is an appropriate surgical option for severe aortic valve disease impacting LV function.
Abstract:
Heart catheterization and quantitative left ventricular ciné-angiography data on thirty patients with aortic vlave disease were analyzed pre-operatively and 12 months after insertion of a Björk-Shiley tilting disc valve. The pre-operative and postoperative data were compared and also with a control group of 22 patients with no organic heart disease. According to the functional NYHA classification, 14 patients had improved, 14 were unchanged and 2 had deteriorated. Regurgitation had been totally corrected in 27 patients, and the high or moderate pressure gradient between the left ventricle and aorta had been reduced, but the valve itself caused a gradient of 5 to 35 mmHg. The pre-operatively abnormal pump function, hypertrophy, dilatation and impaired myocardial function had all become markedly more normal. The most obvious changes were an improvement in stroke work relative to end-diastolic volume and myocardial mass (p less than 0.001) and reductions in end-diastolic volume (p less than 0.001), pump power (p less than 0.001) and myocardial mass (p less than 0.001). Aortic valve replacement seems to be an appropriate procedure in cases where the left ventricular performance and haemodynamics are sufficiently disturbed.