[Bonny619]

I just want to be really clear.

S1 is the lubb and that is the sound of the tricuspid and mitral valves closing.

S2 is the dubb and that is the sound of the aortic and pulmonic valves closing.

Question is...a systolic murmur, is that a tricuspid/mitral valve issue and a diastolic murmur is an aortic/pulmonic issue?

Thanks in advance!

[cardiacnurse9063]

There are two reasons for heart murmurs: stenosis (forward flowing blood trying to get through stenotic valves) (occurs when the valve is open) and insufficiency (blood flowing backward though an incompetent valve) (occurs when the valve is closed).

The valves that are open during systole are the aortic and pulmonic and the valves closed during systole are the mitral and tricuspid. Therefore, aortic stenosis is a systolic murmur and mitral insufficiency is also a systolic murmur.

During diastole, the aortic and pulmonic valves are closed and the mitral and tricuspid are open. Therefore, pulmonic insufficiency and mitral stenosis are diastolic murmurs.

I hope this helps. It's a confusing concept.