9 Monitoring SpO2
197
Example With Short Mode
This diagram shows the area for Short mode, with two examples of hypoxia.
Progressive hypoxia scenario: SpO
2
value (A) - the values drop steadily and after 10 seconds a value
leaves the shaded area. An alarm is indicated immediately.
Recovery scenario: SpO
2
value (B) - the values stay within the shaded area for 24 seconds, deviating
from the alarm limit by 1% or 2%, before rising again above the alarm limit. No alarm is indicated
because the SpO
2
values never leave the shaded area below the alarm limit.
On the basis of the two examples, you can see that the delay depends on how much the value exceeds
the limit, and for how long. Changes in the SpO
2
value can be major, but very short, or minor and for
a longer time - as long as they stay within the shaded area there will be no alarm indicated.
Deviation from
violated Alarm
Limit
Alarm Limit
Resulting Alarm Delay
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