Dräger Narkomed 2B - Page 134

Section 5 - Operation
Breathing Pressure Monitoring
Sample
Threshold
Limit Settings
The figure below illustrates the effects of correct and incorrect settings
of the threshold pressure alarm limit. Threshold pressure is not shown
on the wavefrom when the scale is 0–125 cmH
2
O.
1.
2
.
Threshold pressure alarm limit correctly set to
within 6cm H2O of peak pressure (for alarm
limit settings of 5 through 20cm H2O).
Thus after partial breathing system
disconnection or leak, small pressure
fluctuation does not cross threshold
pressure alarm limit. Operator is warned
of apnea condition.
Threshold pressure alarm limit incorrectly
set more than 6cm H2O below peak
pressure.
1.
BREATHING PRESSURE CmH2O BREATHING PRESSURE CmH2O
4
0
0
40
0
Thus after partial breathing system
disconnection or leak, small pressure
fluctuation in system satisfies incorrectly
set threshold pressure alarm limit.
Operator is not alerted to apnea condition.
2.
OP20053
CORRECT INCORRECT
5-12-8