10 - 4 BeneVision N1 Patient Monitor Operator’s Manual
• 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 NIBP 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.
10.6 Changing the SpO
2
Settings
10.6.1 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 dialog.
2. Select the
Alarm tab.
3. Enter the password if required. For more information, refer to
21.12.3Selecting Password for User
Authentication.
4. Set the alarm properties as desired.
• T
he desat alarm is a high level alarm notifying you of potentially life threatening drops in oxygen
saturation. When the SpO
2
value is below the desat alarm limit and desat alarm switch is set on,
the message “SpO2 Desat” is displayed.
• You can switch off the SpO
2
Desat alarm only when the SpO
2
Desat Alarm Off is enabled. For more
information, see section 21.3.6.6Setting the Switch of the SpO
2
Desat Alarm Off.
10.6.2 Nellcor SatSeconds
TM
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 SatSeconds alarm management technique is used to reduce these nuisance alarms.
The SatSeconds feature is available with the Nellcor SpO
2
to decrease the likelihood of false alarms caused by
motion artifacts. With SatSeconds alarm management, high and low alarm limits are set in the same way as
those with traditional alarm management. A SatSeconds limit is also set. The SatSeconds 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:
SatSeconds = Points × Seconds
Only when the SatSeconds limit is reached, the monitor gives a SatSeconds alarm. For example, the figure below
demonstrates the alarm response time with a SatSeconds 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 SatSeconds are:
After approximately 11 seconds, a Sat-Second alarm would sound, because the limit of 50 SatSeconds would
have been exceeded.
% SpO
2
Seconds SatSeconds
2× 2= 4
4× 3= 12
6× 6= 36
Total SatSeconds= 52
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