BeneVision N Series Patient Monitor Operator’s Manual 31 - 1
31 Monitoring Regional Oxygen Saturation (rSO
2
)
31.1 rSO2 Introduction
The rSO
2
(Regional Oxygen Saturation) monitoring provides noninvasive and continuous information of
changes in regional oxygen saturation of blood. The measurement takes place in real time, providing an
immediate indication of a change in the critical balance of regional oxygen delivery and oxygen consumption.
The harmless, near-infrared wavelengths generated by the INVOS System’s light-emitting diodes pass through
scalp and bone tissue beneath the sensor. Once in vivo they are either absorbed or scattered back up to the
sensor’s shallow and deep detectors. Red-colored hemoglobin molecules within red blood cells have the highest
light absorption of the wavelengths used, and the exact shade of red of each hemoglobin molecule indicates the
amount of oxygen it is carrying. The type and quantity of absorption data returned to the detectors reflects de-
oxyhemoglobin and total hemoglobin, from which a regional oxygen saturation (% rSO
2
) value unique to the
specific area under the sensor is calculated.
(1) Light source (2) Shallow detector (3) Deep detector
(4) rSO
2
menu hard key (5) Set the baseline for all rSO
2
channels
(6) Module status indicator (7) rSO
2
cable connector
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