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Should I wheel out the heliox with non-invasive ventilation?

Heliox is a mixture of helium and oxygen; the most common combination in the UK is oxygen 21%, helium 79%. The substitution of helium for nitrogen produces a gas that is significantly less dense than air; this provides improved gas flow characteristics when turbulent flow might be encountered. Gas flow is said to be turbulent only in the larger airways and thus there is a logical use for heliox in upper airway obstruction.