AVEA ventilator systems Chapter 1: Introduction 5
L2786 Rev. M
WARNING
Connection of a gas supply at the Helium-Oxygen mixture inlet that does not contain 20% oxygen can cause
hypoxia or death.
Although an 80/20 mixture of Helium and Oxygen is marketed as medical gas, the Helium/Oxygen gas
mixture is not labeled for any specific medical use.
Note:
Hot wire flow sensors will not function with Heliox gas mixtures. During Heliox delivery, a variable orifice flow sensor
should be used for monitoring delivered volumes at the proximal airway.
Note:
Heated humidifier performance should be carefully monitored during Heliox therapy. Helium has significantly
greater thermal conductivity compared to nitrogen / oxygen gas mixtures and this could cause difficulty with some
heated humidification devices. A febrile patient may transfer heat via the gas column to a proximal temperature
sensor, which could affect the duty cycle of the humidifier and decrease output. This could cause desiccation of
secretions in the airway.
Alternately, in applications where a heated wire breathing circuit is used, this heat transfer from the patient may affect
the duty cycle of the heated wire circuit, which may result in increased condensation in the breathing circuit.
The relative settings of some types of humidifiers may need to be reduced to prevent overheating of the breathing gas.
Note:
The Oxygen alarm cannot be disabled during Heliox administration
Do not operate nebulizer while using heliox
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