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To the Editor.—
In the letter "The 'Oily' Paper Bag and Hyperventilation" (229:638: 1974), Dr. Riley mentioned that the increased carbon dioxide pressure when rebreathing from the bag held tightly over the mouth and nose lasts for three to four minutes. During this time, the oxygen concentration must fall to quite low levels, inducing a hazard in patients with coronary artery disease, and probably also in others. It would be of interest to know whether the oxygen pressure was measured.
Barach AL. The Oily Paper Bag. JAMA. 1974;230(9):1258. doi:10.1001/jama.1974.03240090018015