Tips to Prevent Artifacts
Only use Nellcor-compatible 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 sensor 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 consequent failure of the
pulse signal.
The pulse signal may fail in the presence of shock, low
blood pressure, severe vasoconstriction, major anemia,
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, blood pressure 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 dysfunctional hemoglo-
bins, such as carboxyhemoglobin or methemoglobin.
Intravascular dyes, such as methylene blue, may also
impair measurement accuracy.
Electrosurgery can impair the measuring accuracy; the
cable and sensor should therefore be positioned as far
away as possible from the site of electrosurgery and its
neutral electrode.
Sensor performance may be impaired and lead to
inaccurate results if the patient moves excessively. The
sensor should be applied to a different site in such cases
in order to reduce the risk of artefacts due to movement.
Monitoring
SpO2 Measurement
Operating Instructions Julian SW 3.n
88
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