Clinical Study of Non-invasive 40-Hz Audiovisual Stimulation Guided by Gamma EEG Monitoring for Promoting Perioperative Brain Function Recovery in Children

Starting soon · Phase 1

Conditions studied: ADHD - Attention Deficit Disorder With Hyperactivity

In brief

Exposure to general anesthesia during early brain development has emerged as an important risk factor for long-term attention-deficit/hyperactivity disorder (ADHD)-like behaviors and learning difficulties in school-aged children. However, objective biomarkers for perioperative neurofunctional assessment and effective non-invasive physical interventions remain lacking in clinical practice. This study adopts a prospective randomized controlled trial (RCT) design to establish a clinical cohort of preschool children undergoing surgery under general anesthesia. Early postoperative intervention will be performed using 40-Hz non-invasive synchronized audiovisual stimulation. Portable electroencephalography (EEG) technology will be employed to quantify prefrontal gamma oscillatory activity by analyzing the relative gamma-band power spectrum and phase-locking index (PLI) during the perioperative period. The study aims to characterize the pathological suppression of gamma oscillations following general anesthesia and to evaluate the restorative effects of 40-Hz stimulation on gamma-band neural activity. Long-term postoperative follow-up, combined with the Conners Rating Scales and the Child Behavior Checklist (CBCL), will be conducted to systematically investigate the association between gamma oscillation restoration and improvements in long-term ADHD-like symptoms. The successful completion of this project will establish an integrated pediatric postoperative neurorehabilitation strategy encompassing screening, intervention, and outcome evaluation, thereby providing a novel clinical approach with substantial translational potential and broad prospects for clinical implementation.

Key facts

Study ID

NCT07719465

Run by

General Hospital of Ningxia Medical University

People needed

80

Starts

2026-09-15

Expected to finish

2027-10-01

Last updated by the study team

2026-07-22

Who can join

Age: 3 and older, up to 6. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Children aged 3-6 years, irrespective of sex, representing the critical period of brain network development.
• Classified as American Society of Anesthesiologists (ASA) Physical Status I or II.
• Scheduled to undergo elective single-session surgery under general anesthesia (including inhalational anesthesia with agents such as sevoflurane) with an expected anesthesia duration of ≥1 hour, including procedures such as inguinal hernia repair, orchiopexy, and adenoidectomy.
• Normal preoperative neurodevelopment as assessed by routine clinical evaluation, with parents or legal guardians able to understand the study protocol and willing to provide written informed consent.

You may not qualify if…

• A preoperative diagnosis of autism spectrum disorder (ASD), epilepsy, intellectual developmental disorder, attention-deficit/hyperactivity disorder (ADHD), or any other neurological or psychiatric disorder.
• Severe visual impairment (e.g., cataract or amblyopia) or significant hearing impairment that would preclude the administration of synchronized audiovisual stimulation.
• A personal or family history of photosensitive epilepsy, owing to safety considerations.
• Occurrence of major anesthesia-related complications during surgery, including severe allergic reactions, malignant hyperthermia, prolonged severe hypoxemia, or other serious perioperative adverse events.

Full record on ClinicalTrials.gov

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