Quick reference guide | Atlan SW 2.0n 41
Principles of operation
To detect any soiling of the HME as early as possible, observe the following:
– Visually check the HME with its transparent housing on a regular basis, e.g, for sputum.
– If there are signs (alarm, air trapping, visual check) which suggest a blockage of the
HME, check the HME and replace it if in doubt.
– Set the alarm limits for MV low and Paw to suitable values if the HME is clear.
Suitable alarm limits in volume-controlled ventilation modes (also for AutoFlow)
If the HME is clear, set the alarm limit for Paw closely above the peak inspiratory pressure
(PIP). If the HME becomes blocked or soiled, its resistance and thus the airway pressure
increases. This will trigger the Airway pressure high alarm.
The following graphic illustrates the Paw alarm limit as a suitable indicator in the event of a
soiled filter:
Suitable alarm limits in pressure-controlled ventilation modes
If the HME is clear, set the expiratory MV low alarm limit closely below the measured MV. If
the HME becomes clogged or soiled, its resistance increases. As a consequence, the
applied and measured expiratory tidal volume VT is reduced and the Minute volume low
alarm is triggered.
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