Computer-assisted fiberoptic pharyngoscopy in obstructive sleep apnea syndrome

Area of Science:

• Otolaryngology
• Sleep Medicine
• Medical Imaging

Background:

• Obstructive sleep apnea syndrome (OSAS) is a common disorder characterized by upper airway (UA) collapse during sleep.
• Understanding UA anatomy is crucial for diagnosing and treating OSAS.
• Traditional methods for UA assessment may not fully capture dynamic changes during airway collapse.

Purpose of the Study:

• To evaluate the utility of computer-assisted fiberoptic pharyngoscopy with Muller's maneuver (CFPMM) in characterizing the upper airway in OSAS patients.
• To correlate UA anatomical findings with polysomnography data.
• To identify specific obstruction sites contributing to OSAS.

Main Methods:

• CFPMM was employed to measure and calculate pharyngeal cavity dimensions in 30 OSAS patients and 30 controls.
• Correlation analysis was performed between UA anatomy and polysomnography parameters.
• Muller's maneuver was utilized to simulate airway collapse during the examination.

Main Results:

• CFPMM accurately measured UA cross-sectional areas.
• OSAS patients exhibited minimal pharyngeal aperture areas below 40 mm² during Muller's maneuver, with 60% showing complete occlusion.
• Velopharyngeal obstruction was present in all cases, with 40% having multiple obstruction sites. Diminished pharyngeal apertures and increased collapsibility correlated with higher apnea-hypopnea indices (p < 0.05).

Conclusions:

• CFPMM is an effective tool for evaluating UA characteristics in OSAS.
• CFPMM aids in pinpointing the precise location of upper airway obstruction.
• Complete upper airway occlusion during Muller's maneuver serves as a criterion for determining obstruction sites in OSAS.