Investigating the Role and Electrophysiological Characteristics of the Human Claustrum Based on SEEG

Xuanwu Hospital, Beijing8 enrolled

Overview

This single-center prospective study aims to investigate the electrophysiological characteristics and functions of the human claustrum by analyzing clinical, imaging, and electrophysiological data from 14\~65-year-old patients with drug-resistant epilepsy.

Stereoelectroencephalography (SEEG) is a method for recording electrical activity from deep brain structures using implanted depth electrodes to provide a three-dimensional view of neuronal activity. Direct Electrical Stimulation (DES) is a neurosurgical technique that involves delivering electrical impulses to specific brain regions through implanted electrodes to map critical functional areas and to study the connectivity of brain regions. This study aims to investigate the electrophysiological characteristics and functions of the human claustrum by analyzing clinical, imaging, and electrophysiological data from patients aged 14 to 65 implanted intracranial electrodes , with a specific focus on electrodes targeting the claustrum. This research forms part of a broader initiative to explore the functions of cortical and subcortical regions based on SEEG.

Study Type

INTERVENTIONAL

Allocation

Purpose

BASIC_SCIENCE

Masking

NONE

Enrollment

Conditions

Refractory Epilepsy Consciousness, Loss of

Interventions

Direct Electrical StimulationOTHER

The patients underwent SEEG with at least one electrode targeting the claustrum. The investigators used the claustrum as a target for both mapping and CCEP, recording changes in cortical electrical activity.

Eligibility

Sex: ALLMin age: 14 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. The patients were diagnosed with drug-resistant epilepsy. 2. The patients underwent stereoelectroencephalography (SEEG) implantation for pre-surgical evaluation of epilepsy, with at least one electrode target reaching the claustrum 3. Participants/parents/legal guardian provide informed consent for inclusion Exclusion Criteria: 1\. Subjects that experience surgical complications during the implant procedure will be excluded from the study

Locations (1)

Xuanwu Hospital,Capital Medical University

Beijing, Beijing Municipality, China

Outcomes

Primary Outcomes

Patients Clinical responses Rating

Researchers categorized patients' clinical responses as normal, mild, moderate, or severe based on their subjective clinical response.

Time frame: During the trial(up to 3 hours for each subject)

EEG power in spectral frequency bands

Using SEEG-implanted electrodes, the investigators applied electrical stimulation of varying intensities to the CLA while observing and recording EEG power changes across six spectral frequency bands during the pre-stimulation, stimulation, and post-stimulation periods. EEG Frequency Bands * delta (1-4 Hz) * theta (5-8 Hz) * alpha (9-12 Hz) * beta (13-30 Hz) * low gamma (31-70 Hz) * high gamma (71-150 Hz)

Time frame: During the trial(up to 3 hours for each subject)

The root mean square (RMS) value of Claustrum-Cortical Evoked Potentials

All cortical-evoked responses were averaged by time-locking the recordings to the onset of each electrical stimulus (zero) off-line, within a time window of -200 to +400 mses, to quantify the morphology. The N1 peak, identified as the first negative deflection distinguishable from the stimulus artifact, was the primary focus due to its clear visibility and reproducibility across different stimulations. The root mean square (RMS) value will be calculated for different cortical locations during time windows that encompass both the N1 peak(early response time time window) and the baseline. A paired one-sample t-test will be used to compare the RMS values in the early response time window across different cortical sites with the RMS values in the baseline.

Time frame: During the trial(up to 3 hours for each subject)

Data from ClinicalTrials.gov

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