S3 vs S4

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S3

Caused by fluid “sloshing” into a large volume. Think of dilation due to volume overload or heart failure.

Mnemonic: “Slosh–ing-in” “Ken–tuck-y”

[1. http://media.tumblr.com/876c1b3ed256bfaca72249dca8882ea7/tumblr_inline_muzzzdu0JE1qfbcoz.jpg]

S4

Caused by fluid hitting a thick wall. Think of concentric hypertrophy.

Mnemonic: “A-stiff–wall” “Ten-I–see”

[1. http://media.tumblr.com/876c1b3ed256bfaca72249dca8882ea7/tumblr_inline_muzzzdu0JE1qfbcoz.jpg]