Publication
Title
Modulation of upper airway collapsibility during sleep : influence of respiratory phase and flow regimen
Author
Abstract
We hypothesized that upper airway collapsibility is modulated dynamically throughout the respiratory cycle in sleeping humans by alterations in respiratory phase and/or airflow regimen. To test this hypothesis, critical pressures were derived from upper airway pressure-flow relationships in six tracheostomized patients with obstructive sleep apnea. Pressure-flow relationships were generated by varying the pressure at the trachea and nose during tracheostomy (inspiration and expiration) (comparison A) and nasal (inspiration only) breathing (comparison B), respectively. When a constant airflow regimen was maintained throughout the respiratory cycle (tracheostomy breathing), a small yet significant decrease in critical pressure was found at the inspiratory vs. end- and peak-expiratory time point [7.1 +/- 1.6 (SE) to 6.6 +/- 1.9 to 6.1 +/- 1.9 cmH(2)O, respectively; P < 0.05], indicating that phasic factors exerted only a modest influence on upper airway collapsibility. In contrast, we found that the inspiratory critical pressure fell markedly during nasal vs. tracheostomy breathing [1.1 +/- 1.5 (SE) vs. 6.1 +/- 1.9 cmH(2)O; P < 0.01], indicating that upper airway collapsibility is markedly influenced by differences in airflow regimen. Tracheostomy breathing was also associated with a reduction in both phasic and tonic genioglossal muscle activity during sleep. Our findings indicate that both phasic factors and airflow regimen modulate upper airway collapsibility dynamically and suggest that neuromuscular responses to alterations in airflow regimen can markedly lower upper airway collapsibility during inspiration.
Language
English
Source (journal)
Journal of applied physiology / American Physiological Society. - Washington, D.C.
Publication
Washington, D.C. : 2002
ISSN
8750-7587
Volume/pages
93:4(2002), p. 1365-1376
ISI
000178034600026
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
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Publication type
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Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
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Creation 03.01.2013
Last edited 08.09.2017
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