namf
Forum Elite
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Hi all!
I know that the S3 heart sound is pathological in adults, not necessarily in pathological in kids.
And S4 is when you have atrial blood flowing down onto a thickened or stiffened ventricular wall--as in hypertrophy with CHF.
So, can anyone tell me how the S3 sound develops/what's making it?
Thank you!
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| mani
Forum Guru
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it occurs due to rapid gush of blood from atria to vent
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| namf
Forum Elite
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Why would that be considered pathological then?
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| mash
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S3 is produced by gush of bld into volume overloaded ventricles and dat is why it is considered pathological in adults
is due to tensing of chordae tendineae and AV ring during ventricular relaxation and filling.
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| namf
Forum Elite
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Yes Mash! That is what I remember Goljan saying earlier!! I couldn't recall until I saw it in your reply--thank you!
Best wishes as always for all your timely help!! 
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| mdwannabe
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I must metion that the sound actually is there allways, but in case of overload or path changes in ventricular wall, it becomes stiff, and as you know stiff substance transmits sound much better than laxed. So you get a sort of amplification of S3.
S4 of the other hand is made when "Atrial Kick" is acting on the R ventricle, so in case of R vntricular hypertrophy the atria must make more affort to contract against stiffer ventricle and S4 become more audible.
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