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of the tracheal tube. (This auxiliary pressure input can be par-
ticularly useful when conducting scientific studies.) For ARDS
patients use the esophageal balloon catheter to determine the
trans-pulmonary pressure. PEEP can be adjusted to maintain
oxygenation and this action prevents damage to the lungs. You
must connect the site to the ventilator through the Paux con-
nector to use the auxiliary pressure input. To make the connec-
tion, use at minimum of 1 m (of 3 mm ID) tubing (flow sensor
tubing works) for the connection. You must also set up the
device’s monitoring functions to recognize the Paux input;
otherwise, the ventilator will continue to use the standard
Paw input.
2.9 Using an expiratory filter
WARNING
• The use of an expiratory filter can lead to a
significant increase in expiratory circuit
resistance. Excessive expiratory circuit
resistance can compromise ventilation and
increased patient work of breathing or
AutoPEEP or both.
• Nebulization of drugs can cause an occlusion
and an increased resistance of the filter.
NOTE:
Monitored parameters for increased expiratory resis-
tance are not specific to the breathing circuit and may
indicate increased patient airway resistance and/or
increased resistance of the artificial airway (if used).
Always check the patient and confirm adequate
ventilation.
An expiratory filter is not required on the HAMILTON-G5, but
you may use one according to your institution’s protocol. An
expiratory filter is not required, because the expiratory valve
design prevents internal ventilator components from contact
with the patient’s exhaled gas.
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