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.
The Following are the consequences of the Handshaking lemma. 1  In any graph, the sum of all the vertex-degree is an even number. 2  In any graph, the number of vertices of odd degree is even. 3  If G is a graph which has n vertices and is regular of degree r, then G has exactly 1/2 nr edges.very disconnected graph can be split up into a number of connected subgraphs, called components. Subgraph. Let G be a graph with vertex set V(G) and edge-list E(G). A subgraph of G is a graph all of whose vertices belong to V(G) and all of whose edges belong to E(G).