Dräger Babylog 8000 plus Operating Instructions Manual page 124

Technical Data
Alarm Criteria
Alarm Criteria
Inspiratory O2 concentration
Disconnection
High inspiratory pressure
High CPAP pressure
Low CPAP pressure
Blocked ET-tube
Kinked patient circuit
124
An alarm is generated when the measured inspiratory O
tration FiO is more than 4 vol% above or below the set value for
2
more than 25 seconds.
A disconnection or a considerable leak in the patient circuit will result
in inadequate pressure building up. Therefore, this condition is
detected by checking whether a minimum pressure has been
reached, depending on the mode of ventilation and set values of
PEEP and P . An alarm is generated when airway pressure does
insp
not reach the minimum pressure PEEP + (Pinsp-PEEP)/4 for at least
0.025 s for each breathing cycle during CMV, A/C, PSV and SIMV.
Airway pressure should not exceed the set pressure limit during man-
datory breaths. A maximum of 5 cmH
immediate alarms in the event of coughs etc. Beyond the alarm
threshold of P + 5 cmH
insp 2
tion is calculated. An alarm is generated when this integral exceeds a
O . s. At that time, a mandatory breath is interrup-
value of 0.33 cmH
2
ted.
Example: Airway pressure rising to 6 cmH
limit and remaining constant. An alarm will then be generated after
0.33 s. If, after the alarm, the pressure-time integral should continue
to increase, ventilation would be interrupted and pressure from the
patient circuit be relieved to ambient.
An alarm is generated during CPAP and in the expiratory phase of
mandatory ventilation modes when airway pressure is continuously
beyond the threshold of PEEP/CPAP+4 for more than 5 s. At that
time, pressure from the patient circuit is relieved to ambient.
If, however, airway pressure exceeds PEEP/CPAP+25 cmH
alarm will be generated already after 0.3 s.
An alarm is generated when airway pressure is below PEEP/CPAP
-2 cmH O and the pressure-time integral exceeds 6 cmH
2
A blocked or kinked ET-tube will not allow the passage of breathing
gas. This situation is detected via flow measurement.
An alarm is generated when no flow is measured in a mandatory
mode of ventilation during the whole ventilatory cycle.
This situation is detected via measurement of airway pressure at the
inspiratory and expiratory connection ports of the ventilator. With a
blocked or kinked patient circuit, pressure will rise at the inspiratory
side. The pressure difference between the two ports is much greater
in this situation than under normal operating conditions.
An alarm is generated when a pressure difference of
8 cmH O+0.6xinsp. flow (in L/min) is exceeded. At that time,
2
pressure from the patient circuit is relieved to ambient.
O is tolerated, thus avoiding
2
O, the pressure-time integral of the viola-
O beyond the pressure
2
concen-
2
O, an
2
O . s.
2