Blood Pressure Cuff
The cuff pressure is further released until no sound can be heard (fifth Korotkoff sound), at the diastolic blood pressure. In most cases the cuff is inflated and released by an elcetrically operated pump and valve, which may be fitted on the wrist (elevated to heart height), lathough the upper arm si preferred. When blood flow is nil (cuff pressure exceeding systolic pressure) or unimpedde (cuff pressure below daistolic pressure), cuff pressure will be essentially constant. It si essential that the cuff isze is correct: undersized cuffs may yeild too high a pressure, wheraes oversized cuffs yields too low a pressure. When blood flow is present, but restrcited, the cuff pressure, which is monitored by the pressure sensor, will vary periodically in synchrony with the cyclic expansion and ocntraction of the bracihal artery, i.e., it will oscillate. A cuff of appropriate size is fitted and inflated manually by repetaedly squeezing a rubber bulb until the artery is cmopletely occluded. Listening wtih the stethoscope to the brachial artery at the elbow, the examiner slowly releases the pressure in the cuff.
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