Oral airway resistance during wakefulness in patients with obstructive sleep apnoea

BACKGROUND Patients with obstructive sleep apnoea (OSA) have a number of upper airway structural abnormalities which may influence the resistance of the oral airway to airflow. There have been no systematic studies of the flow dynamics of the oral cavity in such patients. METHODS Inspiratory oral ai...

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Bibliographic Details
Published in:Thorax 1999-05, Vol.54 (5), p.423-426
Main Authors: Amis, T C, O’Neill, N, Wheatley, J R
Format: Article
Language:English
Subjects:
Airway Resistance - physiology
Biological and medical sciences
body position
Humans
Male
Medical sciences
Middle Aged
Mouth Breathing - physiopathology
obstructive sleep apnoea
oral airway resistance
Original
Patients
Pneumology
Polysomnography
Posture
Pressure transducers
Regression Analysis
Respiratory system : syndromes and miscellaneous diseases
Sleep
Sleep Apnea Syndromes - diagnosis
Sleep Apnea Syndromes - physiopathology
Wakefulness
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Summary:BACKGROUND Patients with obstructive sleep apnoea (OSA) have a number of upper airway structural abnormalities which may influence the resistance of the oral airway to airflow. There have been no systematic studies of the flow dynamics of the oral cavity in such patients. METHODS Inspiratory oral airway resistance to airflow (RO) was measured in 13 awake patients with OSA in both the upright and supine positions (neck position constant). Each subject breathed via a mouthpiece while the nasal airway was occluded with a nasal mask. RESULTS In the upright position the mean (SE) RO was 1.26 (0.19) cm H2O/l/s (at 0.4 l/s) which increased to 2.01 (0.43) cm H2O/l/s when supine (p
ISSN:0040-6376
1468-3296
DOI:10.1136/thx.54.5.423