NCT06524479

Investigating the Functional Characteristics During Wakefulness and Sleep Based on SEEG

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 20 (estimated)
• Sponsor: Xuanwu Hospital, Beijing · Academic / Other
• Sex: All
• Age: 14 Years – 65 Years
• Healthy volunteers: Not accepted

Summary

This study aims to collect electrophysiological and clinical data from patients aged 14-65 with drug-resistant epilepsy who underwent SEEG. The collected data will be analyzed to investigate the functional connectivity during wakefulness and sleep states.

Detailed description

Sleep serves as a fundamental physiological state whose disruption has profound implications for neurological health. The daily alternation between sleep and wakefulness reflects an intrinsic circadian rhythm that orchestrates critical fluctuations in cortical excitability and functional connectivity throughout the brain. The cerebral cortex, comprising approximately 80% of total brain volume, forms the neural substrate for higher-order cognitive functions including sensory perception, executive control, and memory processes. Importantly, sleep acts as a global brain modulator that dynamically reorganizes patterns of neural communication across distributed cortical and subcortical networks. Stereoelectroencephalography (SEEG) provides direct access to intracranial electrophysiological activity with exceptional spatiotemporal resolution. When combined with single-pulse electrical stimulation (SPES), this powerful methodology enables quantitative assessment of inter-regional connectivity through analysis of evoked potentials, allowing precise characterization of both connection strength and directionality. This integrated approach offers unique opportunities to examine how different vigilance states modulate cortical excitability and reorganize functional brain networks, particularly in clinical populations with neurological disorders. The ability to track state-dependent changes in network dynamics provides crucial insights into both normal brain function and pathological conditions.

Conditions

• Refractory Epilepsy
• Sleep

Interventions

Type	Name	Description
PROCEDURE	SEEG recordings and SPES	This study will utilize stereoelectroencephalography (SEEG) recordings combined with single-pulse electrical stimulation (SPES) to investigate functional brain connectivity and cortical excitability patterns in patients with epilepsy during both wakefulness and sleep states. The SEEG recordings will provide high-resolution intracranial electrophysiological data, while SPES will be employed to actively probe and quantify cortico-cortical connections. This combined approach will enable characterization of state-dependent neural network dynamics.

Timeline

• Start date: 2024-07-08
• Primary completion: 2026-06-07
• Completion: 2027-10-08
• First posted: 2024-07-29
• Last updated: 2025-06-27

Locations

1 site across 1 country: China