Covidien Nellcor Series, Operator'S Manual

Page: 98 / 160

Theory of Operations
10-6 Operator’s Manual
10.6.2
Second SpO
2
Event
Consider the second event. Suppose the SatSeconds™ alarm limit is still set to 25.
The patient’s SpO
2
drops to 84% and the duration of the event is 15 seconds before
saturation again exceeds the lower alarm threshold of 85%.
Because the SatSeconds™ alarm limit is set to 25 and the actual number of SatSec-
onds™ equals 15, there is no audible alarm.
Figure 10-4. Second SpO
2
Event: No SatSeconds™ Alarm
1% drop below the lower alarm limit threshold
x15 second duration below the lower threshold
15 SatSeconds ™; no alarm