14 - 4 BeneVision N Series Patient Monitor Operator’s Manual
14.4 SpO
2
Display
• PI is only available for Mindray SpO
2
and Masimo SpO
2
.
14.5 Preparing for SpO
2
Monitoring
To prepare to monitor SpO
2
, follow this procedure:
1. Select an appropriate sensor according to the module type, patient category and weight.
2. Clean the contact surface of the reusable sensor.
3. Remove colored nail polish from the application site.
4. Apply the sensor to the patient according to the instruction for use of the sensor.
5. Select an appropriate extension cable according to the connector type and plug the cable into the SpO
2
connector.
6. Connect the sensor to the extension cable.
• Do not apply sensor too tightly as this results in venous pulsation which may severely obstruct
circulation and lead to inaccurate measurements.
• At elevated ambient temperatures be careful with measurement sites that are not well perfused,
because this can cause burns after prolonged application.
• Avoid placing the sensor on extremities with an arterial catheter, an NBP cuff or an intravascular
venous infusion line.
(1) (2) (3)
( 4 )
(1) (2) (3)
( 5 )
( 4 )
( 6 )
(1) Pleth waveform (Pleth/Plethb): visual indication of patient’s pulse. The waveform is not normalized.
(2) Oxygen saturation of arterial blood (SpO
2
/SpO
2
b): percentage of oxygenated hemoglobin in relation to the sum of
oxyhemoglobin and deoxyhemoglobin.
(3) Perfusion indicator: the pulsatile portion of the measured signal caused by arterial pulsation.
(4) Perfusion index (PI): gives the numerical value for the pulsatile portion of the measured signal caused by arterial
pulsation. PI is an indicator of the pulsatile strength. You can also use it to assess the SpO
2
signal strength.
â—† Above 1 is optimal.
â—† Between 0.3 and 1 is acceptable.
â—† Below 0.3 indicates low perfusion. Set Sensitivity to Maximum first. Reposition the SpO
2
sensor or find a
better site. If low perfusion persists, choose another method to measure oxygen saturation if possible.
(5) Pulse rate (derived from the pleth wave): detected pulsations per minute.
(6) SpO
2
difference (ΔSpO
2
): .
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