OCR Text |
Show Helium and Oxygen The introduction of helium mixed with oxygen as a therapeutic gas was reported by Barach in 1934. Because Be-cause of its physical property and lightness, being one-seventh as heavy as nitrogen, the gas mixture of 21 per cent oxygen and 79 per cent helium may be moved through constricted orifices at a pressure approximately ap-proximately one-half that required for air or nitrogen-oxygen mixtures. Patients with severe asthma have been treated by inhalation of helium-oxygen helium-oxygen mixtures with a favorable outcome in a large percentage of cases. |