Airway dimensions and head posture in obstructive sleep apnoea

Area of Science:

• Orthodontics
• Sleep Medicine
• Radiology

Background:

• Obstructive sleep apnea (OSA) is a condition characterized by repeated episodes of upper airway collapse during sleep.
• Pharyngeal airway dimensions are critical factors influencing OSA development and severity.
• The relationship between airway morphology, head and neck posture, and OSA requires further investigation.

Purpose of the Study:

• To compare pharyngeal airway diameters between male OSA patients and a healthy male reference group.
• To investigate the association between head and cervical column posture and pharyngeal airway dimensions in both groups.

Main Methods:

• Cephalometric analysis of 50 male OSA patients and 103 male students.
• Measurement of pharyngeal airway antero-posterior diameters at seven levels.
• Recording of subjects in natural standing head position (mirror position).

Main Results:

• OSA patients exhibited a 50% narrower pharyngeal airway diameter behind the soft palate compared to controls.
• Increased cranio-cervical extension and cervical column forward inclination correlated with larger caudal airway diameters in OSA patients.
• A similar, but less pronounced, correlation was observed in the reference group for the lowest airway diameter.

Conclusions:

• Pharyngeal airway narrowing, particularly retro-palatally, is a key feature in male OSA patients.
• Compensatory postural mechanisms involving head and neck positioning may help maintain airway patency in awake OSA individuals.
• Understanding these postural adaptations can inform therapeutic strategies for OSA.