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I keep looking online for an answer to how exactly a noise can be heard during diastole when taking blood pressure. I understand that in phase 1, the force from the blood hitting against the pinched part of the blood vessel, (and as a result forcing it open to allow flow), causes a noise. However, I cannot find an intuitive reason as to why or how one can hear a noise during diastole in which there is a LACK of blood hitting against the blood vessel. Why is that? where is the noise actually coming from?

And yes, I know the noise comes from the pressure of the vessel alternating from below the cuff's pressure to above it, but why does that switch produce a noise?

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