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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Amatoury, Jason Kairaitis, Kristina Wheatley, John R. Bilston, Lynne E. Amis, Terence C. |
| Description | Author Affiliation: Amatoury J ( Ludwig Engel Centre for Respiratory Research, Westmead Millennium Institute, Westmead, New South Wales, Australia) |
| Abstract | Caudal tracheal displacement (TD) leads to improvements in upper airway (UA) function and decreased collapsibility. To better understand the mechanisms underlying these changes, we examined effects of TD on peripharyngeal tissue stress distributions [i.e., extraluminal tissue pressure (ETP)], deformation of its topographical surface (UA lumen geometry), and hyoid bone position. We studied 13 supine, anesthetized, tracheostomized, spontaneously breathing, adult male New Zealand white rabbits. Graded TD was applied to the cranial tracheal segment from 0 to â¼ 10 mm. ETP was measured at six locations distributed around/along the length of the UA, covering three regions: tongue, hyoid, and epiglottis. Axial images of the UA (nasal choanae to glottis) were acquired with computed tomography and used to measure lumen geometry (UA length; regional cross-sectional area) and hyoid bone displacement. TD resulted in nonuniform decreases in ETP (generally greatest at tongue region), ranging from -0.07 (-0.11 to -0.03) [linear mixed-effects model slope (95% confidence interval)] to -0.27 (-0.31 to -0.23) cmH2O/mm TD, across all sites. UA length increased by 1.6 (1.5-1.8)%/mm, accompanied by nonuniform increases in cross-sectional area (greatest at hyoid region) ranging from 2.8 (1.7-3.9) to 4.9 (3.8-6.0)%/mm. The hyoid bone was displaced caudally by 0.22 (0.18-0.25) mm/mm TD. In summary, TD imposes a load on the UA that results in heterogeneous changes in peripharyngeal tissue stress distributions and resultant lumen geometry. The hyoid bone may play a pivotal role in redistributing applied caudal tracheal loads, thus modifying tissue deformation distributions and determining resultant UA geometry outcomes. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 7 |
| Volume Number | 116 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2014-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Hyoid Bone Physiology Mechanotransduction, Cellular Pharynx Trachea Adaptation, Physiological Animals Biomechanical Phenomena Lung Volume Measurements Models, Animal Movement Pressure Rabbits Stress, Mechanical Tomography, X-ray Computed Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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