This article is about the breathing gas. For the cryogenic system, see Heliox (cryogenic equipment).
Heliox
Identifiers
CAS Number
58933-55-4
PubChem CID
123812
Chemical and physical data
Formula
He.O2
Molar mass
36.001
Heliox is a breathing gas mixture of helium (He) and oxygen (O2). It is used as a medical treatment for patients with difficulty breathing because this mixture generates less resistance than atmospheric air when passing through the airways of the lungs, and thus requires less effort by a patient to breathe in and out of the lungs. It is also used as a breathing gas diluent for deep ambient pressure diving as it is not narcotic at high pressure, and for its low work of breathing.
Heliox has been used medically since the 1930s, and although the medical community adopted it initially to alleviate symptoms of upper airway obstruction, its range of medical uses has since expanded greatly, mostly because of the low density of the gas.[1][2] Heliox is also used in saturation diving and sometimes during the deep phase of technical dives.[3][4][5]
^Barach AL, Eckman M (January 1936). "The effects of inhalation of helium mixed with oxygen on the mechanics of respiration". The Journal of Clinical Investigation. 15 (1): 47–61. doi:10.1172/JCI100758. PMC 424760. PMID 16694380.
^"Heliox product information". BOC Medical. Archived from the original on 21 November 2008.
^US Navy Diving Manual, 6th revision. United States: US Naval Sea Systems Command. 2008. Archived from the original on 2008-05-02. Retrieved 2008-07-08.
^Brubakk AO, Neuman TS (2003). Bennett and Elliott's physiology and medicine of diving (5th Rev ed.). United States: Saunders Ltd. p. 800. ISBN 0-7020-2571-2.
Heliox is a breathing gas mixture of helium (He) and oxygen (O2). It is used as a medical treatment for patients with difficulty breathing because this...
model specially calibrated specifically for 80:20 heliox gas for use in patients who may benefit from heliox therapy. In November 2015 Vapotherm announced...
difficulties and is very expensive when special breathing gases (such as heliox) are used. They also produce a constant noise inside the helmet, which can...
cylinders gas blending, for mixing breathing gases such as nitrox, trimix and heliox open-circuit scuba sets - mainly used for accelerated decompression in technical...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
6 of the US Navy Diving Manual as the 2008 tables. Besides the air and heliox tables for open circuit bounce dives, the US Navy has published a variety...
and prolongs exercise tolerance. Heliox (79% helium, 21% oxygen) Heliox has a lower density than air. Breathing heliox lowers expiratory airflow resistance...
usually below 130 metres (430 ft). Below this depth, extended breathing of heliox gas mixtures may cause high pressure nervous syndrome (HPNS). Two gas mixtures...
evidence to support its use. There is tentative evidence that breathing heliox (a mixture of helium and oxygen) to decrease the work of breathing is useful...
In medicine, heliox generally refers to a mixture of 21% O2 (the same as air) and 79% He, although other combinations are available. Heliox generates less...
courses specific to the use of both binary gas mixtures, such as Nitrox and Heliox, and ternary, such as Trimix. Since January 2006 recreational diving has...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
for heliox diving. These were successfully used during the rescue of the crew and salvage of the USS Squalus in 1939. The US Navy Mark V Mod 1 heliox mixed...
of hours) may be needed for dexamethasone to work fully. Use of inhaled Heliox (70% helium, 30% oxygen); the effect is almost instantaneous. Helium, being...
diving cylinders with non-air breathing gases such as nitrox, trimix and heliox Tea blending, the process of blending different teas to produce a final...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
eBus, eTruck and passenger vehicle fast charging technology company, Heliox. In March 2024, Siemens announced the creation of a new £100m digital engineering...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
diving field. For instance early experiments carried out by COMEX using heliox and trimix attained far greater depths than any recreational technical diving...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
Bailout gas Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment...
Global Information