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• Inspect heliox cylinder pressure, and keep the cylin-
der at a level sufficient for ventilation (> 2.8 bar
(280 kPa/41 psi)).
• To prevent under- or overheating during heliox ther-
apy, use a patient circuit with heater wire and care-
fully monitor heated humidifier performance.
Heliox’s thermal conductivity, which is greater than
that of nitrogen/oxygen mixtures, can affect the
humidification device output. A febrile patient may
transfer heat via the gas column to a proximal tem-
perature sensor, leading to decreased humidifier out-
put and desiccated airway secretions. In a heater
wire breathing circuit, heat transfer from the patient
can affect the heater wire output and result in
increased condensation in the breathing circuit. In
some humidifiers, you possibly need to reduce
humidifier settings to prevent overheating of the
breathing gas.
• Disconnect all gases if the device is not in use.
The device uses compressed air and oxygen (Table A-3). The
gas fittings available are DISS, NIST or NF. Alternatively, you can
select the heliox option in standby. The compressed gases can
come from central gas supplies, from gas cylinders, or from
the VENTILAIRII medical air compressor. The device’s universal
trolley provides space for the compressor or two cylinders
(if you have the optional VENTILAIR II medical air compressor
mounting kit or cylinder holder installed).
If you are using gases from cylinders, secure the cylinders to the
trolley with the accompanying straps. Connect the gas hoses
to the device’s inlet fittings, shown in Figure 2-21.
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