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1 The third sound was described as a loud, crisp tapping sound. 2  The fourth sound, at pressures within 10 mmHg above the diastolic blood pressure, was described as thumping and muting. 3  The fifth Korotkoff sound is silent as the cuff pressure drops below the diastolic blood pressure.orotkoff sounds are the sounds that medical personnel listen for when they are taking blood pressure using a non-invasive procedure.
When the cuff decompresses to the point that blood flows freely in the artery, the sound is no longer heard in the stethoscope. The number next to the top of the column of mercury when the sound ceases is the diastolic blood pressure (DBP), the second number in the blood pressure reading.