In adults, three conditions are known to cause aortic stenosis. 1  Progressive wear and tear of a bicuspid valve present since birth (congenital). 2  Wear and tear of the aortic valve in the elderly. 3  Scarring of the aortic valve due to rheumatic fever as a child or young adult.ver time, excessive wear and tear leads to calcification, scarring, and reduced mobility of the valve leaflets. About 10% of bicuspid valves become significantly narrowed, resulting in the symptoms and heart problems of aortic stenosis.
Comma Splice Example. Comma splice is a common mistake made by most people who write in the English language. Here, we try to understand what a comma splice is with the help of a few examples. Take a look.
Six Ways to Eliminate Fused Sentences and Comma Splices. 1  It was close to fall. The trees were losing their leaves. 2  It was close to fall; the trees were losing their leaves. 3  It was close to fall, so the trees were beginning to lose their leaves.  It was the time of year when trees begin to lose their leaves.