10 Monitoring SpO2
181
Adjusting the Desat Limit Alarm
The Desat alarm is a high priority (red) alarm notifying you of potentially life threatening drops in
oxygen saturation.
1 In the Setup SpO₂ menu, select Desat Limit.
2 Adjust the limit.
Pleth Wave
The Pleth wave is autoscaled to maximum display size. It decreases only when the signal quality
becomes marginal. It is NOT directly proportional to the pulse volume. If you need an indication of
change in pulse volume, use the perfusion indicator.
1 Minimum size for reliable SpO
2
value
Perfusion Numeric
The perfusion numeric (Perf) gives a value for the pulsatile portion of the measured signal caused by
the pulsating arterial blood flow.
As pulse oximetry is based on the pulsatile nature of the signal, you can also use the perfusion numeric
as a quality indicator for the SpO
2
measurement. Above 1 is optimal, between 0.3-1 is acceptable.
Below 0.3 is marginal; reposition the sensor or find a better site.
Perfusion Change Indicator
The perfusion change indicator is a graphic symbol which shows the change in the perfusion value,
relative to a reference value which you can set.
To set the current perfusion value as the reference value:
•In the
Setup SpO₂ menu, select Set Perf Ref..
When a reference value has been set, the perfusion change indicator is displayed next to the perfusion
numeric.
Setting SpO2/Pleth as Pulse Source
1 In the Setup SpO₂ menu, select Pulse (SpO₂) to enter the Setup Pulse menu.
2 In the Setup Pulse menu, select Syst.Pulse and select SpO₂ from the pop-up list.
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