Third Spo Event; Figure 10-5. Third Spo 2 Event: Triggers Satseconds Alarm - Covidien Nellcor Operator's Manual

Theory of Operations
Third SpO
10.6.3
Consider the third event. Suppose the SatSeconds alarm limit is still set to 25.
During this event, the patient's SpO
lower alarm threshold of 85%. Since the patient's saturation does not return
to a value over the lower alarm threshold within 2.5 seconds, an alarm sounds.
At this level of saturation, the event cannot exceed 2.5 seconds without invok-
ing a SatSeconds alarm.
88
Event
2
10% drop below the lower alarm limit threshold
x2.5 second duration below the lower threshold
25 SatSeconds; results in an alarm
Figure 10-5. Third SpO
drops to 75%, which is 10% below the
2
Event: Triggers SatSeconds Alarm
2
Operator's Manual