Journal article
Dynamic Upper Airway Imaging during Awake Respiration in Normal Subjects and Patients with Sleep Disordered Breathing
The American review of respiratory disease, Vol.148(5), pp.1385-1400
11/1993
DOI: 10.1164/ajrccm/148.5.1385
PMID: 8239180
Abstract
The effects of respiration on upper airway caliber were studied using cine computed tomography (CT) in 15 normal subjects, 14 snorer/mildly apneic subjects, and 13 patients with obstructive sleep apnea. All subjects were scanned in the supine position during awake nasal breathing. Eight-millimeter-thick axial slices were obtained at four anatomic levels from the nasopharynx to the retroglossal region every 0.4 s during a respiratory cycle. Tidal volume measured from an integrated pneumotachograph signal was correlated with slice acquisition during inspiration and expiration to generate loops comparing upper airway area and tidal volume. In all three subject groups and at all anatomic levels studied, there were significant dimensional changes in upper airway caliber during the respiratory cycle. The major findings in this investigation include: (1) the upper airway was significantly smaller in apneic than normal subjects, especially at the retropalatal low and retroglossal anatomic levels; in apneic patients the airway had an anterior-posterior configuration unlike the normal airway, which had a horizontal configuration with the major axis in the lateral direction; (2) in all three subject groups, little airway narrowing occurred in inspiration, suggesting that the action of the upper airway dilator muscles balanced the effects of negative intraluminal pressure.
Details
- Title: Subtitle
- Dynamic Upper Airway Imaging during Awake Respiration in Normal Subjects and Patients with Sleep Disordered Breathing
- Creators
- Richard J SchwabWarren B GefterEric A HoffmanKrishanu B GuptaAllan I Pack
- Resource Type
- Journal article
- Publication Details
- The American review of respiratory disease, Vol.148(5), pp.1385-1400
- DOI
- 10.1164/ajrccm/148.5.1385
- PMID
- 8239180
- ISSN
- 0003-0805
- eISSN
- 2376-3752
- Language
- English
- Date published
- 11/1993
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Internal Medicine
- Record Identifier
- 9984051536402771
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