S1 Heart Sound - Learn How to Auscultate (Part 8)

The S1 heart sound represents the closure of the atrioventricular valves. It can vary in its intensity and in the splitting of the S1 heart sound depending on when the heart valves close.

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[butterswang]

Has this series already ended or there will be more? I really really like it! Thank you a lot~~~!

[mrmariobrosify]

What about when you hear a pause after the second sound.?

[Mohammed-mkhy]

What does variable S1 sound mean ?
Does it mean its intensity is variable from beat to beat or the timing in relation to S2 ?