Phase I for systolic blood pressure; phase V for diastolic blood
For most adults, phase I of the Korotkoff sounds (the
appearance of sounds) is used as the point for measuring systolic
blood pressure, whereas the point of the disappearance of sounds
(phase V) is used to measure diastolic blood pressure. In pregnant
women and young children, phase IV (muffling of sounds) may be used
to determine diastolic blood pressure.
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