Sleep-disordered breathing in major depressive disorder.

Area of Science:

• Psychiatry
• Sleep Medicine
• Respiratory Medicine

Background:

• Major depressive disorder is frequently linked to obstructive sleep apnea.
• The connection between depression and milder sleep-disordered breathing remains under-explored.

Purpose of the Study:

• To investigate the prevalence of sleep-disordered breathing (SDB) in individuals with depression, excluding those with clinically significant sleep apnea.
• To explore the rate at which individuals with depression are excluded from studies due to SDB.

Main Methods:

• Archival data from 60 unmedicated participants (31 depressed, 29 controls) between 1991-2005 were analyzed.
• Respiratory events were automatically detected using a custom-built system measuring nasal airflow and chest pressure.
• Exclusion rates for SDB were assessed via telephone screening and first-night polysomnography.

Main Results:

• Even after excluding participants with significant sleep apnea, depressed individuals exhibited higher SDB rates (apnea-hypopnea index: 0.524 in depressed vs. 0.179 in controls).
• Depression was associated with a 5.86 times higher likelihood of reporting obstructive sleep apnea diagnosis during screening.
• All participants excluded for severe SDB on polysomnography were from the depressed group.

Conclusions:

• A significant relationship exists between depression and elevated rates of sleep-disordered breathing, even in non-severe cases.
• Screening for and quantifying sleep-disordered breathing is crucial in depression research.
• Understanding this comorbidity is vital for comprehensive patient care and research design.