Pathophysiology of upper airway obstruction: a developmental perspective

Area of Science:

• Pediatric Pulmonology
• Sleep Medicine
• Otolaryngology

Background:

• Obstructive sleep apnea syndrome (OSAS) affects individuals across all age groups, from infants to the elderly.
• The precise pathophysiology of OSAS remains incompletely understood.
• Current research points to a combination of anatomical airway narrowing and aberrant upper airway neuromotor control as key contributors to OSAS.

Purpose of the Study:

• To explore the underlying pathophysiology of obstructive sleep apnea syndrome (OSAS).
• To investigate the roles of anatomical factors and upper airway neuromotor tone in OSAS across different age groups.
• To examine age-related differences in upper airway reflexes and their potential implications in OSAS.

Main Methods:

• Review of existing research on the anatomical and neuromuscular aspects of OSAS.
• Analysis of age-specific predisposing factors for airway narrowing.
• Comparison of upper airway reflexes and arousal responses in infants, children, and adults with and without OSAS.

Main Results:

• OSAS is characterized by both anatomical narrowing and abnormal upper airway neuromotor tone, varying across the lifespan.
• A smaller upper airway is a common feature in all age groups, predisposing to sleep-related airway collapse.
• While anatomical factors are recognized, alterations in upper airway neuromotor tone are crucial, especially given that infants and children exhibit blunted compensatory responses to airway obstruction.

Conclusions:

• OSAS pathophysiology is multifactorial, involving anatomical and neuromotor elements that differ with age.
• Abnormalities in upper airway neuromotor tone and reflexes, particularly in children, are significant contributors to OSAS.
• Further research is essential to elucidate the complex interplay of upper airway structure and function in OSAS development and progression.