Philips MP20/30 Manuel D’Utilisation
Perfusion (Pleth) Indicator
9 Monitoring SpO
2
141
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.
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 SpO
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.
Setting SpO
2
/Pleth as Pulse Source
1
In the
Setup SpO2
menu, select
Pulse (SpO
2
)
to enter the
Setup Pulse
menu.
2
In the
Setup Pulse
menu, select
System Pulse
and select
SpO
2
from the pop-up list.
Setting Up Tone Modulation
If tone modulation is on, the QRS tone pitch lowers when the SpO
2
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.
alarm source.
♦
In the
Setup
SpO
2
menu
,
select
Tone Modulation
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.
Incorporated, a Tyco Healthcare company.
Setting the QRS Volume
♦
In the
Setup SpO
2
menu,
select
QRS Volume
and set the appropriate QRS tone volume.
Calculating SpO
2
Difference
When a second SpO
2
measurement is present (either through the SpO
2
module or through VueLink),
the monitor displays both SpO
2
values, and calculates the difference between them. The second value
is subtracted from the first.
minimum size for reliable SpO
2
value