1. Assessment of Airflow in Sleep Studies by Oronasal CO2 Detection
Tom Keener, C.P.F.T., Barbara Phillips, M.D., F.C.C.P. 
CHEST 
Volume 88, Issue 2, (August 1985)
DOI: /chest a
Copyright © 1985 The American College of Chest Physicians Terms and Conditions

2. Figure 1.A
Modified oxygen cannula, showing the two pieces of tubing added behind the nasal prongs. B. The subject wearing oronasal cannula. C. Polysomnographic recording of end-tidal CO2 (CO2) recorded using the oronasal cannula; simultaneous tracings of the rib cage (RC) and abdominal (ABD) components of respiratory inductive plethysmography.
CHEST  , DOI: ( /chest a)
Copyright © 1985 The American College of Chest Physicians Terms and Conditions