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Helium

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Definition: Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. (Dorland, 27th ed)  a rare gas; He-4; He-3   
 
SubstanceCAS Registry & nameCategoriesSourceDrugs*
trimix  89210-11-7 Helium, mixt. with nitrogen and oxygen  *Helium *Nitrogen *Oxygen. J Appl Physiol 1985;58(4):1239
heliox  58933-55-4   *Helium *Oxygen Anoxia/physiopathology. Bull Eur Physiopathol Respir 1983;19(4):401

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012

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