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PSG records from two representative subjects during room air vs hyperoxia. A: room air vs. hyperoxia in one subject/responder. B: room air vs. hyperoxia in one subject/nonresponder. Repetitive obstructive apneas were noted in both A and B. In A, apneas and hypopneas were eliminated by hyperoxia; while in B, the apneas were persistent despite the high FiO2 and SaO2. Note in B, apnea length was increased by hyperoxic inhalation.
