9 Monitoring SpO2
Example With Short Mode
Resulting Alarm Delay
This diagram shows the area for Short mode, with two examples of hypoxia.
Progressive hypoxia scenario: SpO
value (A) - the values drop steadily and after 10 seconds a value
leaves the shaded area. An alarm is indicated immediately.
Recovery scenario: SpO
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
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
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.