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AJNR - American Journal of Neuroradiology

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Evaluation of the Upper Airway Cross-sectional Area Changes in Different Degrees of Severity of Obstructive Sleep Apnea Syndrome: Cephalometric and Dynamic CT Study

Aylin Yucel^a, Mehmet Unlu^b, Alpay Haktanir^a, Murat Acar^a and Fatma Fidan^b

^a Department of Radiology, Afyon Kocatepe University School of Medicine, Afyon, Turkey
^b Department of Chest Diseases, Afyon Kocatepe University School of Medicine, Afyon, Turkey

View larger version (61K): [in a new window]   FIG 1. A, Cross-sectional image of a patient at the level of uvula in tidal breathing. B, The significant narrowing at the same level in forced expiration is seen. The region of interest (white line) was used to assess total cross-sectional areas in each image.

View larger version (156K): [in a new window]   FIG 2. Lateral scout view showing skeletal and soft tissue profile landmarks and the levels at which CT sections were obtained. S, sella; N, nasion; A, subspinale; B, supramental; H, hyoid; MP, mandibular plane; U, tip of the uvula; PNS, posterior nasal spine; SP-max, maximum thickness of the soft palate; level 1, level of tip of the uvula; level 2, level of hypopharynx.

View larger version (21K): [in a new window]   FIG 3. Mean cross-sectional areas at the level of uvula in tidal breathing, at the end of both forced inspiration and expiration in each group.

View larger version (21K): [in a new window]   FIG 4. Mean cross-sectional areas at the level of hypopharynx in tidal breathing, at the end of both forced inspiration and expiration in each group.