- In contrast to most ICU ventilators some Dräger anesthesia devices also have an adjustable
Paw low alarm limit. This alarm limit has to be set either to “automatic” / “AUTO” (if available) or
between PEEP and inspiratory pressure / plateau pressure to detect unintentionally applied
continuous airway pressures as well as intrinsic PEEP situations.
4.6 Alarm notifications
- Please be aware that in Dräger anesthesia devices, alarm notifications are automatically
removed when the alarm situation that caused the alarm is no longer valid. In general, the alarm
design of ICU ventilators is completely different in this respect. Therefore, it is recommended
that the user checks periodically the alarm history / alarm log of the anesthesia device to
see if any alarms have been generated in the absence of the user.
4.7 Gas measurement
- The gas measurement of the anesthesia device, if included in the device, always has to be
connected. Unlike many ICU ventilators, the gas measurement of anesthesia devices is a side-
stream monitoring. Therefore, the gas measurement values and waveforms have a delay of
several seconds.
4.7.1 FiO
2
- The rebreathing of exhaled patient gases is a significant difference from ICU ventilators. The
oxygen concentration of the inhaled gas (measured as “FiO
2
”) may differ from the set oxygen
concentration in the fresh gas as the result of mixing fresh gas with rebreathed gas of the patient.
Therefore, pay special attention to FiO
2
values and the FiO
2
low-alarm limit. The difference
between the fresh gas oxygen concentration and FiO
2
can be reduced to a minimum by
increasing the fresh gas flow to at least 150% of the minute volume. For further help regarding
fresh gas settings please refer to Attachment 6: Fresh gas settings.
4.8 Endotracheal suctioning in a closed system
- Negative pressures by suctioning can harm the lung of the patient and impair the function of
the anesthesia device and thus may lead to failures of the ventilation system. Therefore,
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