10 Monitoring SpO2
Applying the Sensor
Follow the SpO
Remove colored nail polish from the application site.
Apply the sensor to the patient. The application site should match the sensor size so that the
sensor can neither fall off, nor apply excessive pressure.
When using the M1195A Infant Finger Sensor, select a finger or toe with a diameter of between 7
and 8 mm (0.27" and 0.31"). When applying a M1193A neonatal sensor do not overtighten the
Check that the light emitter and the photodetector are directly opposite each other. All light from
the emitter must pass through the patient's tissue.
Proper Sensor Fit: If a sensor is too loose, it might compromise the optical alignment or fall off. If it
is too tight, for example because the application site is too large or becomes too large due to edema,
excessive pressure may be applied. This can result in venous congestion distal from the application site,
leading to interstitial edema, hypoxemia and tissue malnutrition. Skin irritations or lacerations may
occur as a result of the sensor being attached to one location for too long. To avoid skin irritations and
lacerations, periodically inspect the sensor application site and change the application site regularly.
Venous Pulsation: Do not apply sensor too tightly as this results in venous pulsation which may
severely obstruct circulation and lead to inaccurate measurements.
MRI Scanning: Do not use the pulse oximeter or oximetry sensors during magnetic resonance
imaging (MRI) scanning. Induced current could potentially cause burns. The device may affect the
MRI image, and the MRI unit may affect the accuracy of the oximetry measurements.
Damaged Sensors: Do not use damaged sensors / cables or sensors with exposed optical
Low Perfusion: With very low perfusion at the monitored site, the performance might be impaired
and the SpO
Conditions Affecting Performance: During hypotension, severe vasoconstriction, severe anemia, or
hypothermia of the patient the performance may be impaired. Also in these conditions or when the
patient is in cardiac arrest or in shock, it may not be possible to make measurements at all.
Ambient Temperature: At elevated ambient temperatures be careful with measurement sites that are
not well perfused, because this can cause severe burns after prolonged application. All listed sensors
operate without risk of exceeding 41°C on the skin if the initial skin temperature does not exceed
Extremities to Avoid: Avoid placing the sensor on extremities with an arterial catheter, an NBP cuff
or an intravascular venous infusion line.
Do not immerse the sensors.
Nellcor OxiMax technology: This product contains chemicals known to the state of California to
cause cancer and birth defects or other reproductive harm.
sensor's instructions for use, adhering to all warnings and cautions.
readings may read lower than arterial oxygen saturation.