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November 1971


Author Affiliations

Washington Hospital Center Washington, DC

Arch Otolaryngol. 1971;94(5):481-482. doi:10.1001/archotol.1971.00770070727022

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Dr. Karlan has made a very interesting and fairly complete review of the literature. We thank him for his contribution and questions.

The data presented in the report that appeared in the June 1971 issue has been substantiated by additional studies performed on 50 patients. The arterial Pco2 has not risen and remained below induction levels. The duration of the procedures lasted up to 15 minutes, in some instances, and here again there has been no rise in arterial Pco2.

Pressures were originally measured with a water manometer and later with an aneroid manometer. It is true that there is a time lag for the manometer to stabilize. The pressures reported were obtained when the pressure reached a peak level with a continuous jet flow of oxygen.

In a report under preparation, studies on oxygen rate flow, total volume of air displaced, and oxygen concentrations have been measured

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