Altered Brain Microstate Dynamics in Adolescents with Narcolepsy.

Area of Science:

• Neuroscience
• Sleep Medicine
• Brain Imaging

Background:

• Narcolepsy is a chronic sleep disorder linked to hypocretin-1 neuron loss in the hypothalamus.
• Prior neuroimaging (PET, SPECT) revealed hypothalamic, thalamic, and prefrontal dysfunction in narcolepsy.
• Aberrant perfusion and metabolism suggest underlying brain network alterations.

Purpose of the Study:

• To investigate and describe brain microstate activity in adolescents with narcolepsy.
• To correlate microstate dynamics with resting-state networks (RSNs) using simultaneous fMRI and EEG.
• To identify potential neurophysiological markers of narcolepsy in adolescents.

Main Methods:

• Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were used during wakeful rest.
• EEG data were analyzed for microstates (discrete global brain states).
• fMRI data were analyzed for resting-state networks (RSNs).

Main Results:

• Narcolepsy patients spent less time in a specific microstate compared to healthy controls.
• This microstate was found to be related to the default mode network (DMN).
• Findings suggest a potential disease-specific disruption of the DMN in narcolepsy.

Conclusions:

• Adolescents with narcolepsy demonstrate altered resting-state brain dynamics.
• Microstate analysis reveals potential disruptions in network connectivity, particularly the DMN.
• These findings contribute to understanding the neurobiology of narcolepsy in adolescents.