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18.2.6 Why is there no SET value for MAP and dp in HFO mode?
The rate and changing lung mechanics make the setting of MAP and dp
unpredictable. There are guidelines as to what values should be aimed for, and
these will be continually adjusted in accordance with the changing lung mechanics
and clinical observation
18.3 Patient Circuits
18.3.1 What is the difference between the N2188 and N5188 patient circuit?
The difference between the two circuits is the restrictor. The N2188 patient circuit
has a red restrictor, calibrated for 5LPM fresh gas and is suitable only for the
SLE2000 and SLE2000 HFO ventilators. The N5188 patient circuit has an amber
restrictor, calibrated for 8LPM fresh gas and is suitable only for the SLE4000 and
SLE5000 ventilators.
18.3.2 Why is a restrictor necessary?
The function of the restrictor is to create a back pressure in the inspiratory limb
which creates the leak and block alarms when there is a drop in pressure
18.3.3 What is a /02 patient circuit?
This a single use patient circuit where the temperature probe is right up at the
patient manifold. This circuit may be used inside an incubator. The idea of using
this circuit is an attempt to reduce the amount of condensation in the patient circuit,
by controlling/heating the entire inspiratory limb.
18.3.4 What is a /850 patient circuit?
The /850 denotes it use with a F&P 850 humidifier.
18.3.5 What happens if the restrictor is placed in the expiratory limb instead of the
inspiratory limb?
There will be a fixed pressure of 20mbar in the expiratory limb i.e. 20mbar PEEP/
CPAP. However, the restrictor is now moulded into the inspiratory limb in single use
circuits.
18.3.6 Should bacterial filters be used on the expiratory limb?
SLE recommends the use of a single use bacterial filter on the expiratory limb as
a way of preventing contamination of the ventilator and the environment. It does
need to be changed every 24hrs, or if wet at any time. A wet bacterial filter will no
longer filter bacteria and will also cause an increase in pressure. As diligent
changing of the filter cannot be guaranteed, the exhalation block should still be
autoclaved after every use.
18.3.7 When using the INOSYS Nitric Oxide therapy and the ventilator what scavenging
filters do I need?
When using NO it is recommended that 2 sets of scavenging filters be used. This
solves the issue of any build up of pressure and fluctuating Mean Airway
Pressures. A hose assembly is fitted to the end of the exhalation block. The hose
assembly has a bifurcated “Y” connection and the scavenging filters are attached
to each hose.
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