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Obstructive sleep apnea: diagnosis with ultrafast CT
J R Galvin1, S A Rooholamini, W Stanford
1Department of Radiology, University of Iowa Hospitals and Clinics, Iowa City 52242.
Radiology
|June 1, 1989
Summary
Patients with obstructive sleep apnea have smaller and more collapsible upper airways compared to healthy individuals. Ultrafast CT scans reveal these anatomical differences, aiding in understanding sleep-disordered breathing.
Area of Science:
- Respiratory Medicine
- Radiology
- Sleep Medicine
Background:
- Sleep-disordered breathing is often linked to upper airway abnormalities present during wakefulness.
- Physiologic and anatomical factors contribute to the development of obstructive sleep apnea.
Purpose of the Study:
- To investigate upper airway dimensions and compliance in patients with obstructive sleep apnea (OSA) using ultrafast computed tomography (CT).
- To compare airway measurements between OSA patients and healthy controls.
Main Methods:
- Ultrafast CT scanning was employed to measure oropharyngeal and nasopharyngeal cross-sectional areas in 11 OSA patients and 24 healthy volunteers.
- Airway compliance was assessed by measuring the percentage of change in cross-sectional area during quiet tidal breathing.
Main Results:
- Patients with OSA exhibited significantly smaller oropharyngeal (40.4 vs 177.8 mm2) and nasopharyngeal airways (31.3 vs 134.2 mm2) compared to controls (P < .001).
- The oropharyngeal airways of OSA patients were significantly more compliant (75% vs 27%) than those of controls (P < .001).
Conclusions:
- Obstructive sleep apnea is associated with a small, collapsible oropharyngeal airway and nasopharyngeal narrowing.
- These upper airway abnormalities identified via ultrafast CT scanning are critical factors contributing to sleep-disordered breathing.