BeneVision N22/N19 Patient Monitor Operator’s Manual 13 - 5
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.
• For neonatal patients, make sure that all sensor connectors and adapter cable connectors are
outside the incubator. The humid atmosphere inside can cause inaccurate measurements.
• Up to two measurement sites are available simultaneously.
13.6 Changing the SpO
2
Settings
13.6.1 Changing the SpO
2
Alarm Settings
To change the SpO
2
alarm settings, follow this procedure:
1. Select the SpO
2
numeric area or waveform area to enter the SpO2 menu.
2. Select the
Alarm tab.
3. Set the alarm properties of SpO
2
, Desat:
â—† Switch on or switch off the alarms for SpO
2
and Desat.
â—† Adjust the alarm limits and alarm priority for SpO
2
and Desat.
â—† Switch on or switch off the alarm recording for SpO
2
and Desat.
For SpO
2
b, you can also set alarm properties for SpO
2
.
13.6.2 Nellcor Sat-Seconds Alarm Management
With traditional alarm management, high and low alarm limits are set for monitoring oxygen saturation. During
monitoring, once an alarm limit is violated, an audible alarm immediately sounds. When the patient SpO
2
fluctuates near an alarm limit, the alarm sounds each time the limit is violated. Such frequent alarms can be
distracting. Nellcor’s Sat-Seconds alarm management technique is used to reduce these nuisance alarms.
The Sat-Seconds feature is available with the Nellcor SpO
2
to decrease the likelihood of false alarms caused by
motion artifacts. With Sat-Seconds alarm management, high and low alarm limits are set in the same way as
those with traditional alarm management. A Sat-Seconds limit is also set. The Sat-Seconds limit controls the
amount of time that SpO
2
saturation may be outside the set limits before an alarm sounds.
The method of calculation is as follows: the percentage points of the SpO
2
saturation falling outside the alarm
limit is multiplied by the number of seconds remaining outside the limit. This can be stated as the equation:
Sat-Seconds = Points × Seconds
Only when the Sat-Seconds limit is reached, the monitor gives a Sat-Seconds alarm. For example, the figure
below demonstrates the alarm response time with a Sat-Seconds limit set at 50 and a low SpO
2
limit set at 90%.
In this example, the patient SpO
2
drops to 88% (2 points) and remains there for 2 seconds. Then it drops to 86%
(4 points) for 3 seconds, and then to 84% (6 points) for 6 seconds. The resulting Sat-Seconds are:
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