Monitoring
SpO2 Measurement
78
Tips to prevent artefacts
Only use Nellcor sensors in the recommended positions,
otherwise incorrect measurements and tissue damage
may result.
Damaged sensors with exposed electrical contacts must
not be used – danger of electric shock.
Used adhesive strips of the Oxiband-OXI-A/N and
OXI-P/I sensor must not be reused, as they may not
adhere properly.
The strips must not be stretched unduly.
Never use two strips together, as this may lead to venous
pulsation and failure of the pulse signal.
High intrathoracic pressure, pressure on the thorax and
other consecutive impairments of the venous flow can
lead to venous pulsation with failure of the pulse signal.
The pulse signal may fail in the presence of shock, low
blood pressure, severe vasoconstriction, major anaemia,
hypothermia, arterial occlusion proximal to the sensor and
asystolia.
The sensor must be protected from exposure to bright
light (e.g. surgical lamps and direct sunlight), otherwise
the pulse signal may fail or inaccurate results may be
obtained.
The sensor should not be positioned on limbs together
with an arterial catheter, sphygmomanometer cuff or
intravascular venous infusion, otherwise the pulse signal
may fail and measurement become inaccurate.
Measurement accuracy may be reduced in the presence
of significant concentrations of dyshaemoglobins, such
as carboxyhaemoglobin or methaemoglobin.
Intravascular dyes, such as methylene blue, may also
impair measurement accuracy.
Electrocautery can impair the measuring accuracy; the
leads and sensor should therefore be positioned as far
away as possible from the electrocautery and its neutral
electrode.
Sensor performance may be impaired and lead to
inaccurate results if the patient moves violently. The
sensor should be applied to a different site in such cases
in order to reduce the risk of artefacts due to movement.
"Only for internal use by Draeger. Not applicable as Instructions for Use!"
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