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Cine CT in obstructive sleep apnea.

M G Stein, G Gamsu, G de Geer

    AJR. American Journal of Roentgenology
    |June 1, 1987
    PubMed
    Summary
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    This study shows that the upper airway narrows and collapses more during sleep and apnea in patients with obstructive sleep apnea. Cine CT imaging can objectively assess airway changes to guide surgical treatment.

    Area of Science:

    • Radiology
    • Sleep Medicine
    • Otolaryngology

    Background:

    • Obstructive sleep apnea (OSA) is a common condition characterized by upper airway collapse during sleep.
    • Objective evaluation of the upper airway is crucial for effective treatment of OSA.

    Purpose of the Study:

    • To evaluate upper airway anatomy and collapsibility in patients with OSA using rapid sequential computed tomography (CT).
    • To correlate upper airway measurements with polysomnography findings during awake, asleep, and apneic states.

    Main Methods:

    • Eight patients with OSA underwent rapid sequential CT scans of the upper airway.
    • Scans were performed while awake, asleep, and during apnea.
    • Four patients also had simultaneous polysomnography to determine sleep and apnea onset.

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    Main Results:

    • All eight patients exhibited a narrowed and more collapsible upper airway while awake.
    • Five patients had cross-sectional areas ≤ 4 mm² at some point during the awake respiratory cycle.
    • Airway obstruction during apnea occurred at the uvula and oropharynx in all patients, with variable inferior extension.

    Conclusions:

    • Cine CT is a valuable tool for objectively evaluating the upper airway in OSA patients.
    • CT findings can identify specific sites of obstruction and collapsibility, potentially guiding surgical interventions.