4
-
59
SpO
2
SEC Alarm Setup (For Nellcor Model: DS-7000)
When the SpO
2
value is unstable around the lower alarm limit, the frequently generated alarm may be
annoying. The SEC alarm function controls these frequent alarms.
This function generates the alarm only when the integral value (the accumulation of difference between
the alarm limit and SpO
2
value at every second) reaches the preprogrammed SEC alarm threshold
value.
The integral value of the SEC alarm is calculated as follows.
0
10
20
30
40
50
60
70
80
90
100
1
5
9 13 17 21 25 29 33 37 41 45 49 53 57 61
[SEC]
S
E
C A
larm Integral V
a
lue [%]
Integral Value
Alarm Generation
SpO2 Value
Alarm Limit
On this graph, the SEC alarm threshold value is set as 100.
The SpO
2
value begins to fall below the alarm limit at approximately 10 seconds. At the same time, the
integral value begins to increase.
(Alarm limit) – (SpO
2
value) is accumulated each second.
At around 25 seconds, the integral value reaches 100 and the alarm is generated.
At approximately 36 seconds, the SpO
2
value returns to the level within the alarm limit, and at the same
time, the integral value begins to decrease.
{
(Alarm limit) – (SpO
2
value)
}
x 2 is subtracted each
second.
Also, there is a safety net when setting the SEC alarm function. This safety net is for the case when the
SpO
2
value frequently falls below the alarm limit but does not last long enough to reach the SEC alarm
threshold.
If the SpO
2
value falls below the limit 3 times or more during the last 60 seconds, an alarm will be
generated even if the SEC alarm threshold is not reached.
C A U T I O N
z
Whether to use the SEC alarm function and its threshold selection should be
based on the patient’s clinical indication portent and medical evaluation.
z
If the SpO
2
alarm and SEC alarm setup is set to OFF, the SEC alarm integral
value will be set to 0.
4
Alarm Setup
Summary of Contents for DynaScope 7000 Series
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