The correct answer is 1. To correctly identify normal Korotkoff sounds, deflating the cuff at a rate of 2 mm Hg per second is recommended. Korotkoff sounds are the series of sounds corresponding to blood flow through the brachial artery. There are five recognized phases of Korotkoff sounds, of which the first phase corresponds to the systolic pressure, while the disappearance of sound at Phase V) corresponds to the diastolic pressure.
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