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In the tents in general use for the administration of oxygen, provision is made for the removal of excess carbon dioxide by circulating the atmosphere of the tent through a container filled with soda lime. In order that the soda lime may be kept active for the removal of the carbon dioxide, it must be renewed every forty-eight hours. Since 30 pounds (13.6 Kg.) of the soda lime must be replaced each time and since soda lime is expensive, this part of the care of an oxygen tent becomes not only a troublesome but a somewhat costly procedure.
During the past two years, we have treated seventy-five patients ill with lobar pneumonia in oxygen tents of either the Roth Barach or the McDonald type. When
we first used these tents we noted occasionally that even though the soda lime was not changed for periods somewhat longer than the prescribed forty-eight
ROSENBLÜTH MB, BLOCK M. OXYGEN THERAPY WITHOUT SODA LIME. JAMA. 1932;98(5):396–397. doi:10.1001/jama.1932.02730310036008
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