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Brain Activity and Changes in Consciousness During General Anesthesia

19. September 2026 aktualisiert von: Beijing Chao Yang Hospital

Mechanism Exploration of General Anesthesia-Induced Altered Consciousness Via Cortical-Thalamic Network Modulation and Development of a Precision Anesthesia Depth Monitoring Device

This study aims to investigate how general anesthetics alter brain activity and consciousness across different age groups. The study will evaluate four anesthetic agents with different mechanisms of action: propofol, remimazolam, esketamine, and dexmedetomidine. Electroencephalography (EEG) will be recorded during wakefulness, anesthetic induction, loss of responsiveness, and recovery of responsiveness to characterize changes in brain activity and brain network dynamics.

The study includes children aged 6-12 years undergoing surgery, healthy young adults aged 20-40 years, and healthy older adults aged 65-80 years. Resting-state EEG will be used to examine changes in brain rhythms, temporal and spatial brain dynamics, and network organization across different levels of consciousness. In a subgroup of young adult participants, auditory stimuli will also be presented continuously to investigate how the brain processes sounds and meaningful information as consciousness decreases and subsequently recovers.

The study will compare EEG changes across anesthetic agents, age groups, and states of consciousness. It will also evaluate the timing of loss and recovery of responsiveness, anesthetic dose-response relationships, and adverse events. The overall goal is to identify brain activity patterns associated with anesthesia-induced changes in consciousness and to provide a scientific basis for improved monitoring of consciousness and anesthetic depth.

Studienübersicht

Status

Noch keine Rekrutierung

Bedingungen

Intervention / Behandlung

Studientyp

Interventionell

Einschreibung (Geschätzt)

320

Phase

  • Phase 4

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studienorte

      • Beijing, China, 100020
        • Affiliated Beijing Chaoyang Hospital of Capital Medical University
        • Kontakt:

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

6 Jahre bis 80 Jahre (Kind, Erwachsene, Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Ja

Studienberechtigte Geschlechter

Alle

Beschreibung

Inclusion Criteria:

  1. Participants must belong to one of the following prespecified age groups: children aged 6-12 years, young adults aged 20-40 years, or older adults aged 65-80 years.
  2. Children must be surgical patients undergoing general anesthesia. Young adult and older adult participants will be healthy volunteers.
  3. American Society of Anesthesiologists (ASA) physical status I; older adult participants may have ASA physical status II.
  4. Written informed consent must be obtained from all adult participants and surgical patients as applicable. For pediatric participants, written informed consent must be provided by a parent or legal guardian.

Exclusion Criteria:

  1. History of neuropsychiatric disorders, including epilepsy, dementia, or other relevant neurological or psychiatric diseases.
  2. Known hearing impairment or physical impairment that may interfere with completion of the study procedures or tasks.
  3. History of allergy to propofol, benzodiazepines, or other anesthetic agents used in the study.
  4. Long-term use of sedative or analgesic medications for more than 1 month. Disturbed sleep pattern within 14 days before the study, including shift work or insomnia.
  5. Communication difficulties or inability to cooperate with EEG data acquisition.

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Hauptzweck: Grundlegende Wissenschaft
  • Zuteilung: Nicht randomisiert
  • Interventionsmodell: Parallele Zuordnung
  • Maskierung: Keine (Offenes Etikett)

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Experimental: Propofol Group

Participants in this arm will receive propofol. In young and older healthy volunteers, propofol will be administered by target-controlled infusion, with the plasma target concentration increased by 0.5 μg/mL every 5 minutes up to a maximum of 5 μg/mL to induce loss of responsiveness. EEG will be recorded during wakefulness, anesthetic induction, loss of responsiveness, and recovery. Pediatric surgical participants in this group will undergo EEG recording during anesthesia in the operating room.

Propofol will be administered by target-controlled infusion in young and older healthy volunteers. The plasma target concentration will be increased by 0.5 μg/mL every 5 minutes, up to a maximum of 5 μg/mL, until protocol-defined loss of responsiveness is achieved. Consciousness will be assessed every minute using the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale, and EEG will be recorded throughout anesthetic induction and recovery.

Experimental: Remimazolam Group

Participants in this arm will receive remimazolam. In young and older healthy volunteers, remimazolam will be administered intravenously at sequential infusion rates of 0.5, 1.0, 1.5, and 2.0 mg/kg/h, with each level maintained for 5 minutes, until loss of responsiveness is achieved. EEG will be recorded during wakefulness, anesthetic induction, loss of responsiveness, and recovery. Pediatric surgical participants in this group will undergo EEG recording during anesthesia in the operating room.

Remimazolam will be administered intravenously in young and older healthy volunteers at sequential infusion rates of 0.5, 1.0, 1.5, and 2.0 mg/kg/h, with each level maintained for 5 minutes, until protocol-defined loss of responsiveness is achieved. Consciousness will be assessed every minute using the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale, and EEG will be recorded throughout anesthetic induction and recovery.

Experimental: Esketamine Group

Participants in this arm will receive esketamine. In young and older healthy volunteers, esketamine will be administered intravenously with the infusion rate increased by 0.10 mg/kg/h every 5 minutes, up to a maximum of 0.50 mg/kg/h, to induce loss of responsiveness. EEG will be recorded during wakefulness, anesthetic induction, loss of responsiveness, and recovery. Pediatric surgical participants in this group will undergo EEG recording during anesthesia in the operating room.

Esketamine will be administered intravenously in young and older healthy volunteers. The infusion rate will be increased by 0.10 mg/kg/h every 5 minutes, up to a maximum of 0.50 mg/kg/h, until protocol-defined loss of responsiveness is achieved. Consciousness will be assessed every minute using the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale, and EEG will be recorded throughout anesthetic induction and recovery.

Experimental: Dexmedetomidine Group

Participants in this arm will receive dexmedetomidine. In young and older healthy volunteers, dexmedetomidine will be administered intravenously with stepwise increases of 0.1 μg/kg/h, up to a maximum of 0.7 μg/kg/h, to induce loss of responsiveness. EEG will be recorded during wakefulness, anesthetic induction, loss of responsiveness, and recovery. Pediatric surgical participants in this group will undergo EEG recording during anesthesia in the operating room.

Dexmedetomidine will be administered intravenously in young and older healthy volunteers with stepwise increases in the infusion rate of 0.1 μg/kg/h, up to a maximum of 0.7 μg/kg/h, until protocol-defined loss of responsiveness is achieved. Consciousness will be assessed every minute using the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale, and EEG will be recorded throughout anesthetic induction and recovery.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Changes in Resting-State Quantitative EEG Measures Across Behavioral Responsiveness States
Zeitfenster: From the start of the 10-minute awake baseline through anesthetic induction, loss-of-responsiveness maintenance, emergence, and 30 minutes after recovery of responsiveness

Continuous resting-state EEG will be quantified across awake baseline, anesthetic induction, loss of responsiveness, maintenance, emergence, and recovery. Prespecified measures include delta power (0.5-4 Hz), alpha power (8-12 Hz), theta/alpha power ratio, slow-wave index (SWI), burst suppression ratio (BSR), autocorrelation window at the first zero crossing (ACW-0), EEG complexity (gMLZC), and alpha-band (8-13 Hz) functional connectivity/network measures, including wPLI/dwPLI² and weighted global efficiency. Each measure will be analyzed separately.

From the start of the 10-minute awake baseline through anesthetic induction, loss-of-responsiveness maintenance, emergence, and 30 minutes after recovery of responsiveness
Changes in Auditory-Evoked ERP and Time-Frequency EEG Measures Across Behavioral Responsiveness States
Zeitfenster: From the start of the 10-minute awake baseline through anesthetic induction, loss of responsiveness, maintenance, emergence, and at least 10 minutes after recovery of responsiveness

Auditory-evoked EEG will be quantified across awake baseline, anesthetic induction, loss of responsiveness, maintenance, emergence, and recovery. Event-related potential (ERP) measures include N100, mismatch negativity (MMN), N400, and P300 amplitudes and their state-related temporal dynamics. Stimuli include pure tones, white noise, characters, words, sentences, another person's name, and the participant's own name. Time-frequency measures include event-related theta-band activity (4-8 Hz), alpha-band activity (8-12 Hz), and intertrial phase coherence. Source-space analyses will localize N400 and P300 generators, and single-trial ERP amplitudes will be analyzed in relation to behavioral responsiveness. Each measure will be analyzed separately.

From the start of the 10-minute awake baseline through anesthetic induction, loss of responsiveness, maintenance, emergence, and at least 10 minutes after recovery of responsiveness

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Geschätzt)

1. September 2026

Primärer Abschluss (Geschätzt)

1. September 2028

Studienabschluss (Geschätzt)

1. Dezember 2028

Studienanmeldedaten

Zuerst eingereicht

4. September 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

19. September 2026

Zuerst gepostet (Tatsächlich)

23. September 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

23. September 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

19. September 2026

Zuletzt verifiziert

1. August 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • 2026-ke-429
  • L2510005 (Andere Zuschuss-/Finanzierungsnummer: Beijing Natural Science Foundation - Capital Clinical Medical Innovation Joint Fund)

Plan für individuelle Teilnehmerdaten (IPD)

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UNENTSCHIEDEN

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Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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