CPAP adherence and partial upper airway obstruction during sleep.

Area of Science:

• Sleep Medicine
• Respiratory Physiology
• Public Health

Background:

• Nasal continuous positive airway pressure (CPAP) is the standard treatment for severe obstructive sleep-disordered breathing (SDB).
• Partial obstruction is often misclassified as mild SDB, potentially leading to assumptions of poor CPAP adherence.
• Understanding the prevalence and impact of partial obstruction is crucial for accurate SDB diagnosis and management.

Purpose of the Study:

• To investigate the occurrence of partial obstruction in male and female subjects.
• To evaluate the impact of partial obstruction on CPAP adherence after one year.
• To determine if partial obstruction represents a distinct entity from mild SDB.

Main Methods:

• Retrospective study of 233 age and BMI-matched male-female pairs.
• Utilized a static-charge-sensitive bed to assess breathing patterns during sleep.
• Analyzed the proportion of partial obstruction and periodic breathing in relation to CPAP adherence.

Main Results:

• Women exhibited less overall SDB and periodic breathing but a trend towards more partial obstruction compared to men.
• Partial obstruction constituted a higher percentage of breathing abnormalities in women (50.2%) than in men (37.2%).
• CPAP adherence rates were similar between genders and not significantly affected by the proportion of partial obstruction or periodic breathing in women.

Conclusions:

• Partial obstruction is prevalent, particularly in women, and may be underestimated by the apnea-hypopnea index.
• Symptomatic partial obstruction does not appear to be associated with poor CPAP adherence.
• Partial obstruction may represent a distinct sleep-disordered breathing entity rather than solely mild SDB.