Heart sounds s1 s2 s3 s4| Auscultation areas | lub dub sound of the heart | why these areas?

This video explains the logic involved in the Auscultation of heart sounds and why these areas for Auscultation.
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[logicmedico]

Thanks for watching. For more of such educational videos

[doctorindia]

Thank u so much sir
Sir, I wanted to ask u
In practicals we match heart sound with carotid pulse
And consider it as S1
As per explanation it should have been S2 right?