Philips MP20/30, MP40/50, MP60/70/80/90 Perfusion (Pleth) Indicator, Setting SpO2/Pleth as Pulse Source, Setting Up Tone Modulation, Setting the QRS Volume, Calculating SpO2 Difference

Perfusion (Pleth) Indicator 9Monitoring SpO
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Perfusion (Pleth) Indicator
The perfusion indicator gives a numerical 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 indicator
as a quality indicator for the SpO2 measurement. Above 1 is optimal, between 0.3-1 is acceptable.
Below 0.3 is marginal; reposition the sensor or find a better site.
Setting SpO2/Pleth as Pulse Source
1In the Setu p SpO2 menu, select Pulse (SpO2) to enter the Setup Pulse menu.
2In the Setu p Pulse menu, select System Pulse and select SpO2 from the pop-up list.
Setting Up Tone Modulation
If tone modulation is on, the QRS tone pitch lowers when the SpO2 level drops. Remember, the QRS
tone is derived from either heart rate or pulse depending on which is currently selected as the active
alarm source.
♦In the Setup SpO2 menu, select Tone Mo dulatio n to toggle between Yes (for on) and No
(for off).
Tone modulation is licensed under US patent US 4,653,498 from Nellcor Puritan Bennett
Incorporated, a Tyco Healthcare company.
Setting the QRS Volume
♦In the Setu p SpO2 menu, select QRS Volume and set the appropriate QRS tone volume.
Calculating SpO2 Difference
When a second SpO2 measurement is present (either through the SpO2 module or through VueLink),
the monitor displays both SpO2 values, and calculates the difference between them. The second value
is subtracted from the first.
minimum size for reliable SpO2 value