When measuring blood pressure using the auscultatory method, Korotkoff sounds are heard as the cuff pressure falls below systolic pressure and blood begins to flow turbulently through the partially compressed artery. The first appearance of clear tapping sounds corresponds to the systolic pressure. As cuff pressure continues to decrease, the sounds change in quality and eventually disappear, indicating that blood flow has become laminar and is no longer obstructed. The point at which the Korotkoff sounds disappear (Phase V) is recorded as the diastolic pressure in adults.