Covidien Nellcor - Product Compliance Standards

Theory of Operations
86 Operator’s Manual
10.6.1 First SpO2 Event
Consider the first event. Suppose the SatSeconds alarm limit is set to 25. The
patient’s SpO
2 drops to 79% and the duration of the event is two (2) 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 Sat-
Seconds equals 12, there is no audible alarm.
Figure10-3.First SpO2 Event: No SatSeconds Alarm
6% drop below the lower alarm limit threshold
x 2 second duration below the lower threshold
12 SatSeconds; no alarm