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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) that 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:
Paw
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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Instructions for use
Atlan A100 (XL), A300 (XL), A350 (XL) SW 2.1n
Principles of operation
323
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