Valvular aortic stenosis (AS) is a progressive disease that affects 2% of the population aged 65 years or older. The major cause of valvular AS in adults is calcification and fibrosis of a previously normal tricuspid valve or a congenital bicuspid valve. with rheumatic AS being rare in the United States. Once established. https://globechemicalcompanyls.shop/product-category/sweeper/