First Spo Event; Figure 10-3. First Spo 2 Event: No Satseconds Alarm - Covidien Nellcor Operator's Manual

Theory of Operations
First SpO
10.6.1
Consider the first event. Suppose the SatSeconds alarm limit is set to 25. The
patient's SpO
before saturation again exceeds the lower alarm threshold of 85%.
Because the SatSeconds alarm limit is set to 25 and the actual number of Sat-
Seconds equals 12, there is no audible alarm.
86
Event
2
drops to 79% and the duration of the event is two (2) seconds
2
6% drop below the lower alarm limit threshold
x 2 second duration below the lower threshold
12 SatSeconds; no alarm
Figure 10-3. First SpO Event: No SatSeconds Alarm
2
Operator's Manual