Accutorr 7 Operator’s Manual 7 - 1
7 Monitoring SpO
2
7.1 Overview
SpO
2
monitoring is a non-invasive technique used to measure the amount of
oxygenated hemoglobin by measuring the absorption of selected wavelengths of light.
The light generated in the probe passes through the tissue and is converted into
electrical signals by the photodetector in the probe. The SpO
2
module processes the
electrical signal and displays a waveform and digital values for SpO
2
and pulse rate.
This device is calibrated to display functional oxygen saturation. It provides the
following.
1. Pleth waveform (Pleth): visual indication of patient’s pulse. The waveform is not
normalized.
2. PI indicator: Graphic Indication of arterial pulse signal strength.
3. Oxygen saturation of arterial blood (SpO
2
): percentage of oxygenated
hemoglobin in relation to the sum of oxyhemoglobin and deoxyhemoglobin.
4. Perfusion index (PI): PI is available for Masimo SpO
2
module. 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 quality
of SpO
2
measurement.
◆ Above 1 is optimal
◆ Between 0.3 and 1 is acceptable.
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