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.
In the second of a six part guide to splicing, Sailing Today takes a look at a double braid eye splice, a neat-looking but tricky splice. Double braid lines with a polyester core are commonly used for a variety of low stretch running rigging roles such as halyards, reefing and control lines. This splice is a real money saver as there are potentially a lot of these splices within a yachtâs running rigging. Donât try your first time on used rope. New rope is more slippery and hasnât yet been stretched and compacted between core and cover, so is much easier to work and splice. Also thicker rope is less fiddly to work, with more space between core and cover, so try your first splice on 12mm diameter or larger. See our guide to a three-strand eye-splice here.