Influence of obstructive sleep apnea on auditory event-related potentials

Area of Science:

• Neuroscience
• Sleep Medicine
• Auditory Neuroscience

Background:

• Obstructive sleep apnea (OSA) is a prevalent sleep disorder characterized by repeated episodes of upper airway collapse during sleep.
• Auditory event-related potentials (ERPs), specifically the P300 response, are sensitive electrophysiological markers of cognitive processing, including attention and information processing speed.
• The impact of OSA on auditory ERPs, particularly the P300 component, remains an area requiring further investigation to understand its neurological consequences.

Purpose of the Study:

• To investigate the effect of obstructive sleep apnea (OSA) on the P300 response of auditory event-related potentials (ERPs).
• To determine if electrophysiological findings, specifically P300 characteristics, correlate with the severity of OSA.
• To elucidate potential mechanisms linking OSA to auditory cognitive deficits.

Main Methods:

• A cohort of patients with no OSA and mild, moderate, and severe OSA, confirmed by polysomnography (PSG), were recruited.
• Exclusion criteria included hearing loss risk factors, BMI ≥ 40 kg/m², hypertension, diabetes, dyslipidemia, and chronic medication use.
• Auditory ERPs were measured using an oddball paradigm with tone burst and speech stimuli, with P300 latencies and amplitudes analyzed using multiple linear regression models adjusted for age, BMI, and Epworth score.

Main Results:

• Fifty-four participants (mean age 35 ± 8 years, mean BMI 28.4 ± 4.3 kg/m²) were categorized into no OSA (n=14), mild OSA (n=16), moderate OSA (n=12), and severe OSA (n=12) groups based on the apnea-hypopnea index (AHI).
• Patients with severe OSA exhibited significantly prolonged P300 latencies when presented with tone burst stimuli compared to individuals with no OSA, mild OSA, and moderate OSA.
• No significant differences in P300 amplitudes were reported across the groups.

Conclusions:

• Severe obstructive sleep apnea is associated with impaired P300 responses in auditory ERPs.
• This impairment suggests a reduced speed of processing acoustic information in individuals with severe OSA.
• The observed electrophysiological changes may be influenced by the degree of somnolence associated with severe OSA.