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The cuff pressure at the first signal is the systolic pressure. After confirming a return
of the rhythmical blood flow signals, the CPU opens the air valve to dump the cuff
pressure and converted to systolic pressure waveform signals which can be
displayed.
Oscillometry:
While taking blood pressure on Automatic Arterial Testing screen and deflating cuff
for arm or leg after the inflation, the unit detects oscillations of the blood vessel
synchronizing with each heart beat and determines the systolic pressure based on
oscillometry algorithm.
Photoplethysmography:
While taking toe pressure with PPG probe as well as performing PPG venous reflux
study, the unit senses the reflection of light from the hemoglobin of the red blood
cells in surface vessels by utilizing infrared light with the probe.
Pneumoplethysmography (PV):
While performing PV waveform test for toes and legs on either Automatic or Doppler
Arterial Testing, the unit assesses changes in blood volume in the tissues beneath
an inflated cuff. Alterations in pressure are transmitted to a pressure transducer that
records the volume changes through the cardiac cycle to produce a waveform.
