Dräger Atlan A350 - Page 309

Instructions for use | Atlan A300, A300 XL, A350, A350 XL SW 1.0n 309
Principles of operation
As a consequence, the CO2 waveform may fall at the end of the expiration before
the inspiration is executed, in contrast to the normal course of the waveform.
The unusual waveform shape results from the small dead space. The measured
values derived from the CO
2 waveform are nevertheless correct, as the etCO2
value corresponds to the maximum expiratory value and is not subject to the
waveform fluctuations.
17.4.2 Reasonable alarm settings
If the HME is clogged or soiled, the suction flow for the gas measurement may
cause negative pressure in the patient’s lungs. To detect imminent clogging of the
HME (e.g., by sputum), set the alarm limits for MV low and Paw high to suitable
values.
Volume-controlled ventilation modes (also with AutoFlow)
If the HME filter is clear, set the alarm limit for Paw high closely above the peak
inspiratory pressure (PIP). If the HME is clogged or soiled, the Paw high alarm will
be triggered due to the increased resistance.
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