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.
Mitral stenosis is another condition that sometimes requires a valve replacement procedure. Replacing a leaky valve: Aortic regurgitation, (sometimes referred to as aortic insufficiency) is another common valve problem that may require valve replacement. Regurgitation means that the valve allows blood to return back through the valve and into the heart instead of moving it forward and out to the body.