Now, following the above steps: 1  The parent hydrocarbon chain has 23 carbons. It is called tricosa-. 2  The functional groups with the highest precedence are the two ketone groups. The groups are on carbon atoms 3 and 9. 3  The side chains are: an ethyl- at carbon 4, an ethyl- at carbon 8, and a butyl- at carbon 12.
1 doctor agreed: 1  AORTIC REGURGITATION: Aortic regurgitation is reflux of blood through an incompetent aortic valve into the left ventricle during ventricular diastole (relaxation). During ventricular systole (contraction), blood is pumped from the left ventricle into the aorta. Because of a leaky aortic valve, the pumped blood returns to the left ventricle.
Any condition that damages the aortic valve can cause aortic valve regurgitation. Common causes of chronic valve problems include: 1  Being born with a bicuspid aortic valve or a damaged aortic valve. 2  Aging. 3  Enlargement of the aorta because of high blood pressure or hardening of the arteries. 4  Rheumatic fever.