1. 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 (July 1994)
DOI: /chest
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

2. 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  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

3. 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  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

4. 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  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

5. 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  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

6. 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  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions