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.
4. A comma splice is the incorrect use of a comma to join two independent clauses. Incorrect: I love classical music, it makes me feel joyful. Correct: I love classical music because it makes me feel joyful.Correct: I love classical music; it makes me feel joyful.5.he second is called a comma splice, which occurs when two or more independent clauses are joined by just a comma and no coordinating conjunction. Example of a run-on sentence : The flowers are beautiful they brighten the room. (Incorrect). Example of a comma splice : The flowers are beautiful, they brighten the room.