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September 5, 1959, Vol 171, No. 1 >
ARTICLE | September 5, 1959

EVALUATION OF AN OXYGEN THERAPY UNIT

Reuben C. Balagot, M.D.; Max S. Sadove, M.D.
JAMA. 1959;171(1):36-40. doi:10.1001/jama.1959.03010190038011.
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A portable tank with a capacity of 56 liters of compressed oxygen is equipped with control valves, pressure gauge, plastic bag, and mask for use in short-period oxygen therapy. A unit of this sort was tested on six subjects under conditions permitting continuous determinations of oxygen concentration in the air of the oropharyngeal passage and of oxygen saturation in the blood of the ear. In addition, blood samples were obtained for determinations of arterial oxygen and carbon dioxide concentration in four subjects asleep under thiopental. The flow from the tank was initially about 6 liters per minute and declined as the pressure fell. It gave satisfactory oxygen and carbon dioxide values in unconscious persons for about 12 minutes. When the rate of flow declined below 4 liters per minute the elimination of carbon dioxide from under the mask was inadequate, so that after the 12th minute there was a significant degree of hypercarbia.

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