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.
Aortic regurgitation is where blood leaks back through the aortic valve. This is because the valve does not close properly. With each heartbeat, more blood than usual enters the left ventricle and so it needs to work harder.Mild regurgitation may not cause symptoms.he aortic valve lies between the left ventricle and the aorta. When the left ventricle relaxes, the aortic valve closes and the mitral valve opens. This allows more blood into the ventricle, ready for the next heartbeat. Aortic regurgitation is sometimes called aortic incompetence or a leaky aortic valve.