Familial aggregates in obstructive sleep apnea syndrome

Area of Science:

• Medical Genetics
• Sleep Medicine
• Otolaryngology

Background:

• Obstructive sleep apnea syndrome (OSAS) is a common disorder.
• Familial aggregation of OSAS suggests a genetic component.
• Understanding risk factors, including familial and anatomical, is crucial for diagnosis and prevention.

Purpose of the Study:

• To investigate the familial aggregation of OSAS.
• To identify specific clinical, polysomnographic, and craniofacial risk factors associated with OSAS in relatives.
• To assess the role of craniofacial anatomy in familial OSAS.

Main Methods:

• Diagnosed OSAS in index cases using clinical symptoms, physical evaluation, cephalometry, and polysomnography.
• Recruited first-degree relatives and age-matched non-related friends for comparison.
• Administered questionnaires and conducted clinical investigations, including ambulatory monitoring and cephalometric X-rays.

Main Results:

• Snoring and daytime sleepiness were associated with increased OSAS risk.
• A high and narrow (ogival) hard palate, combined with daytime tiredness/sleepiness, strongly differentiated relatives from friends (OR = 10.9).
• High Epworth Sleepiness Scale scores and elevated respiratory disturbance index (>5) yielded a high odds ratio (OR = 45.6).
• Disproportionate craniofacial anatomy was prevalent in familial OSAS groups.

Conclusions:

• Familial factors play a significant role in OSAS.
• Specific craniofacial features, particularly a high and narrow palate, are strong indicators of OSAS risk within families.
• Craniofacial familial features can serve as a key indicator for OSAS development risk.