Ohmeda Biox 3700 - Page 40

1118-301
SIGNAL AND DATA VALIDITY
If noise is seen on the waveform because of poor probe placement, the
detector may not be flush with the test site. Check that the probe
is secured and the tissue sample is not too thick. Pulse rate is
determined from the plethysmographic waveform which can be disrupted
by a cough or other hemodynamic pressure disturbances. Motion at the
test site is indicated by noise spikes in the normal waveform. It
has been noted that letting the patient view the plethysmographic
waveform enables them to assist in reducing motion artifact (e.g.
stress testing). If three good passes of the plethys-ographic wave
form do not occur, check the patient and the oximeter set up.
NOISY PHOTO-PLETHYSMOGRAPHIC WAVEFORM
noise spike
NOISY PHOTO-PLETHYSMOGRAPHIC WAVEFORM
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