Variability of human upper airway collapsibility during sleep and the influence of body posture and sleep stage
- 9 May 2011
- journal article
- Published by Wiley in Journal of Sleep Research
- Vol. 20 (4), 533-537
- https://doi.org/10.1111/j.1365-2869.2011.00925.x
Abstract
The critical pressure at which the pharynx collapses (Pcrit) is an objective measurement of upper airway collapsibility, an important pathogenetic factor in obstructive sleep apnoea. This study examined the inherent variability of passive Pcrit measurement during sleep and evaluated the effects of sleep stage and body posture on Pcrit. Repeated measurements of Pcrit were assessed in 23 individuals (15 male) with diagnosed obstructive sleep apnoea throughout a single overnight sleep study. Body posture and sleep stage were unrestricted. Applied upper airway pressure was repetitively reduced to obtain multiple measurements of Pcrit. In 20 subjects multiple measurements of Pcrit were obtained. The overall coefficient of repeatability for Pcrit measurement was 4.1 cm H₂O. Considering only the lateral posture, the coefficient was 4.8 cm H₂O. It was 3.3 cm H₂O in the supine posture. Pcrit decreased from the supine to lateral posture [supine mean 2.5 cm H₂O, 95% confidence interval (CI) 1.4-3.6; lateral mean 0.3 cm H₂O, 95% CI -0.8-1.4, P = 0.007] but did not vary with sleep stage (P = 0.91). This study has shown that the overall coefficient of repeatability was 4.1 cm H₂O, implying that the minimum detectable difference, with 95% probability, between two repeated Pcrit measurements in an individual is 4.1 cm H₂O. Such variability in overnight measures of Pcrit indicates that a single unqualified value of Pcrit cannot be used to characterize an individual's overall collapsibility during sleep. When within-subject variability is accounted for, change in body posture from supine to lateral significantly decreases passive pharyngeal collapsibility.Keywords
This publication has 15 references indexed in Scilit:
- Performance Characteristics of Upper Airway Critical Collapsing Pressure Measurements during SleepSleep, 2011
- Upper airway function and arousability to ventilatory challenge in slow wave versus stage 2 sleep in obstructive sleep apnoeaThorax, 2009
- Random effects models in clinical research.Int. Journal of Clinical Pharmacology and Therapeutics, 2008
- Mouth-opening Increases Upper-airway Collapsibility without Changing Resistance during Midazolam SedationJournal of Dental Research, 2004
- Relationship between surface tension of upper airway lining liquid and upper airway collapsibility during sleep in obstructive sleep apnea hypopnea syndromeJournal of Applied Physiology, 2003
- Upper Airway Collapsibility During Sleep in Upper Airway Resistance SyndromeSocial psychiatry. Sozialpsychiatrie. Psychiatrie sociale, 2002
- Effect of Sleep Position and Sleep Stage on the Collapsibility of the Upper Airways in Patients with Sleep ApneaSleep, 2001
- Abbreviated Method for Assessing Upper Airway Function in Obstructive Sleep ApneaSocial psychiatry. Sozialpsychiatrie. Psychiatrie sociale, 2000
- Upper Airway Collapsibility in Snorers and in Patients with Obstructive Hypopnea and ApneaAmerican Review of Respiratory Disease, 1991
- Measurement in Medicine: The Analysis of Method Comparison StudiesJournal of the Royal Statistical Society: Series D (The Statistician), 1983