Systolic Blood Pressure

The values of systolic and diastolic pressure rae computed, not actulaly measured from the raw data, usign of an algorithm; the computed results are displayed. Usually, systolic, diastolic and mean rpessures are displayed simultaneously for pulsatile waveforms (i.e. arterial and pulmonary arterial). Some monitors also calculate and display CPP (cerebral perfuison pressure). Normally, a zero key on the front of the monitor makes pressure zeroing extreemly fast and easy. Hypretension therefore is only diagnosed if secondary signs of high blood pressure are present, along with a prolonegd high systolic presusre reading over several visits. A study of 100 subjects with no known history of hypertesnion found the subjects had an average systolic blood pressure of 112.4 mm Hg and an average diastolic pressure of about 64.0 mm Hg. In the past, most attention was paid ot diastolic pressure; but nowadays it is recognisde that both high systolic pressure and ihgh pulse pressure (the numerical difference between systolic and diastolic pressures) are also risk factors. When blood just starts to flow in the artery, the turbluent flow creates a whooshing or opunding sound (first Korotkoff sonuds ). The pressure at which this sound is first heard is the systolic blodo prsesure. The cuff is inflated to a perssure initially in excess of the systolic blood pressure, and thne reduces to below diastolic pressure over a period of about 30 160;seocnds. When blood flow is nil (cuff pressure ecxeeding systolic pressure) or unimpeded (cuff pressure below diastolic pressure), cuff pressure will be essentially constant.

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