Treatment effects on brain activity during a working memory task in obstructive sleep apnea.

Area of Science:

• Neuroscience
• Sleep Medicine
• Cognitive Psychology

Background:

• Positive airway pressure (PAP) therapy is the primary treatment for obstructive sleep apnea (OSA).
• Low adherence and treatment interruptions are common challenges in OSA management.
• The neurological effects of acute PAP withdrawal in OSA patients remain unstudied.

Purpose of the Study:

• To investigate the impact of acute PAP treatment withdrawal on brain activity during a cognitive task in individuals with OSA.
• To explore changes in brain resource allocation associated with PAP cessation.

Main Methods:

• Nine participants with OSA underwent functional magnetic resonance imaging (fMRI).
• Participants completed a 2-Back verbal working memory task under two conditions: PAP treatment (≥1 week) and non-treatment (2 nights).
• Brain activity was compared between treatment and non-treatment conditions using fMRI.

Main Results:

• PAP treatment significantly altered brain activity, showing reduced deactivation in the right posterior insula and increased activation in the right inferior parietal lobule during the 2-Back task.
• PAP withdrawal led to more pronounced effects: increased 2-Back activity and further decreased deactivation compared to the 0-Back control.
• These findings suggest a potential need for resource reallocation in the brain upon PAP cessation.

Conclusions:

• Acute withdrawal from effective PAP treatment in OSA patients may necessitate increased cognitive resource allocation.
• Brain activity patterns during working memory tasks are sensitive to short-term PAP cessation.
• Understanding these neurological shifts is crucial for addressing treatment adherence challenges in OSA.