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The Korotkoff sounds are produced by the turbulent flow of blood through an artery. They are named after their discoverer Dr. Korotkoff. They are heard by the medical person by using stethoscope when both systolic and diastolic blood pressure levels of a patient are determined using sphygmomanometer over an the brachial artery in arm.

Hope this information will clear your doubts about the Korotkoff sounds.
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