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To the Editor:—
Dr. Conroy questions our values for the O2 concentrations obtained with the nasal cannulas and further doubts that the nasal cannula is an effective method for oxygen administration. It should be pointed out that our O2 concentrations are not materially different from those previously reported with the older, heavy metal nasal cannulas and that, in our hospital, oxygen administration by this method has been effective clinically.Concern was expressed about our method for obtaining end-expiratory alveolar gas samples. As stated in our paper, each subject at the time of sampling exhaled completely into a Haldane-Priestley tube. In this technique the subject exhaled continuously, his expired gas bubbling through a sampling tube containing slightly acidified water. These sampling tubes provided for the trapping of the last 125 cc. of the forced expiratory volume under the water seal. This end-expiratory gas was then transferred into a mercury-sealed
Kory RC. Oxygen Therapy-Reply. JAMA. 1962;182(5):593. doi:10.1001/jama.1962.03050440085026