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Old 03-07-2015
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Default splitting heart sound on inspiration and expiration

Can someone please explain to me why you get splitting of second heart sound (A2 and P2) during inspiration and why you get paradoxical/reversed splitting P2 followed by A2 during expiration?

When does this occur?
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Old 03-07-2015
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Usually the aortic valve closes before the pulmonic and this will lead to te normal splitting of S2 which is audible in inspiration because During inspiration u increase the venoUs return to the right side which will delay the closure of the pulmonic valve further
Paradoxical splitting Occurs in expiration because it is due to aortic valve closure delay (like in aortic stenosis) and this delay is much more during expiration when u increased venous return(COP) to the left side of the heart
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Old 03-08-2015
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Quote:
Originally Posted by Hopefuldoc View Post
Usually the aortic valve closes before the pulmonic and this will lead to te normal splitting of S2 which is audible in inspiration because During inspiration u increase the venoUs return to the right side which will delay the closure of the pulmonic valve further
Paradoxical splitting Occurs in expiration because it is due to aortic valve closure delay (like in aortic stenosis) and this delay is much more during expiration when u increased venous return(COP) to the left side of the heart
Thanks a lot! Makes sense
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