Heliox was titrated to maintain oxygen saturation ≥93%; treatment failures received 100% oxygen. An unblinded investigator assessed patients every 30 minutes; after each hour, all patients but ...

Heliox Redux. Helium is an inert, colorless gas. It was discovered by spectroscopic methods during an eclipse of the sun in India in 1868 and, thus, was named from the Greek word helios, which ...

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