Glen L. Prosise, B.A., Richard B. Berry, M.D., F.C.C.P. CHEST

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Oral-Nasal Continuous Positive Airway Pressure as a Treatment for Obstructive Sleep Apnea Glen L. Prosise, B.A., Richard B. Berry, M.D., F.C.C.P. CHEST Volume 106, Issue 1, Pages 180-186 (July 1994) DOI: 10.1378/chest.106.1.180 Copyright © 1994 The American College of Chest Physicians Terms and Conditions

Figure 1 The mask used to deliver oral-nasal CPAP (ONCPAP). A hole was cut in the latex rubber sheath just large enough to accommodate the nose and mouth. CHEST 1994 106, 180-186DOI: (10.1378/chest.106.1.180) Copyright © 1994 The American College of Chest Physicians Terms and Conditions

Figure 2 The apnea + hypopnea indices for individual patients in part 1 of the study on baseline and ONCPAP nights. The mean apnea + hypopnea index using ONCPAP was significantly reduced (p<0.001). CHEST 1994 106, 180-186DOI: (10.1378/chest.106.1.180) Copyright © 1994 The American College of Chest Physicians Terms and Conditions

Figure 3 The percentage of the sleep period time spent awake and in each sleep stage on the baseline and the second ONCPAP nights. The error bars are the standard deviations. The percentage of stage 1 sleep was lower (p<0.01) and the percentages of slow-wave and REM sleep were higher (p<0.01) on ONCPAP compared with baseline nights. CHEST 1994 106, 180-186DOI: (10.1378/chest.106.1.180) Copyright © 1994 The American College of Chest Physicians Terms and Conditions

Figure 4 A tracing of patient 2 during NREM sleep on bilevel (inspiratory/expiratory) pressure (16/14 cm H2O) while being monitored with a dual-chamber mask. Combined oral and nasal flow was present. CHEST 1994 106, 180-186DOI: (10.1378/chest.106.1.180) Copyright © 1994 The American College of Chest Physicians Terms and Conditions

Figure 5 The percentage of the sleep period time spent awake and in each sleep stage on the NCPAP and ONCPAP nights in part 2 of the study. The error bars are the standard deviations. The subjects had a higher percentage of stage 2 sleep on NCPAP nights (p=0.03) and tended to spend more time awake and in stage 1 sleep on the ONCPAP nights. CHEST 1994 106, 180-186DOI: (10.1378/chest.106.1.180) Copyright © 1994 The American College of Chest Physicians Terms and Conditions