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Stimolazione elettrica transcranica della coscienza (CONTEST_3)

Effetto della stimolazione elettrica transcranica sulla coscienza dei pazienti non comunicanti.

The aim of this study is to investigate the effect of transcranial Alternating Current Stimulation (tACS) at theta frequency and the the effect of transcranial Direct Current Stimulation (tDCS) on the conscious state of non-communicating patients. tACS and tDCS are non-invasive stimulation techniques that are used to induce brain oscillations at certain frequency or to increase the brain activity in applied region.

Limited treatments are available to improve consciousness in severely brain injured patients. Transcranial Direct Current stimulation (tDCS) is one of the few therapeutics that showed evidence of efficacy to increase level of consciousness and functional communication in some Minimally Conscious State (MCS) patients, and in some Vegetative State (VS) patients. However the optimal intensity of electrical current stimulation remains unknown and transcranial Alternative Current Stimulation (tACS), with the ability to stimulate cortex at specific frequencies and to manipulate phase-synchrony between regions is a promising techniques to improve patients' consciousness.

In this study, the investigators will use prefrontal tDCS and theta tACS to improve patients consciousness level.

Panoramica dello studio

Stato

Terminato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

This study is constituted of two independent sub-studies investigating two types of stimulation (tDCS and tACS) with the same cross-over design

Study design The study design is composed of two experimental sessions, one active stimulation and one sham comparator. Sessions will be randomized in a double-blind randomized crossover design (neither the participant nor the experimenter knows which session includes which stimulation type), with at least 2 days of interval between them.

In these sessions, the patients' state of consciousness participants will first be determined using the dedicated Coma Recovery Scale - Revised (Giacino, Neurology 2002) (CRS-R) scale before stimulation. Resting state brain activity EEG and cognitive auditory paradigm (local-global paradigm, Bekinschtein, PNAS 2009) will also be recorded before stimulation.

Twenty minutes stimulation will then be performed (see below). CRS-R, resting state EEG and local-global paradigm will be repeated after stimulation.

Outcome measures will be the same in the two studies. The primary outcome will be the change of CRS-R between before and after stimulation. Secondary outcomes will be the neurophysiological correlates of consciousness in resting state EEG and during the local global paradigm.

tACS stimulation During tACS sessions, 6 Hz stimulation (1000 μA) will be applied simultaneously over the left prefrontal dorso-lateral cortex (F3 of the 10-20 international scalp EEG system) and the left parietal cortex (P3) using an 8-channels stimulator (Starstim NE, Neuroelectrics, Barcelona, Spain) with small round sponge electrodes (25 cm2 surface, maximal current density of 0.06 μA/cm2), controlled via Bluetooth. In the in-phase condition, the phase difference between the two stimulation sites will be 0° which will entrain synchronization between sites. In the sham condition, the stimulation will start with a current intensity of 1000 μA lasting for 30 seconds. Afterwards, the intensity will progressively decrease over 20 seconds until cessation. Each stimulation session will take 20 minutes and the positions of stimulation electrodes and the duration of the stimulation will be kept identical for all conditions.

tDCS stimulation During tDCS session, 2000 μA stimulation will be applied over the left prefrontal dorso-lateral cortex (F3 of the 10-20 international scalp EEG system) (Starstim NE, Neuroelectrics, Barcelona, Spain) with small round sponge electrodes (25 cm2 surface, maximal current density of 0.06 μA/cm2), controlled via Bluetooth. In the sham condition, the stimulation will start with a current intensity of 2000 μA lasting for 30 seconds. Afterwards, the intensity will progressively decrease over 20 seconds until cessation. Each stimulation session will take 20 minutes and the positions of stimulation electrodes and the duration of the stimulation will be kept identical for all conditions.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

20

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

      • Paris, Francia, 75013
        • Institut du Cerveau et de la Moelle - CR-ICM U 975 / UMRS INSERM 1127

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 18 anni a 80 anni (Adulto, Adulto più anziano)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Descrizione

Inclusion Criteria:

  • Age between 18 and 80 years
  • Non communicative patients with disorder of consciousness diagnosed by CRS-R (VS, MCS, exitMCS)
  • Patients with stable clinical examination (even in intensive care)
  • Brain injury confirmed by cerebral imaging (MRI or TDM)
  • French social security affiliation
  • Signed and informed consent by the patient or by a legal representant

Exclusion Criteria:

  • Status epilepticus or uncontrolled epilepsy
  • Severely neurodegenerative illnesses (Alzheimer disease, Lewy Body Dementia)
  • Electrical stimulation contraindication (metallic intra-cranial implants, pacemaker or implantable cardioverter-defibrillator, cranial prosthesis)
  • Pregnant, parturient or breastfeeding women- Patients underage

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione incrociata
  • Mascheramento: Quadruplicare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: In-phase 6 Hz prefronto-parietal tACS

6 Hz stimulation (1000 μA) with transcranial Alternative Current Stimulation (tACS) will be applied simultaneously over the left prefrontal dorso-lateral cortex (F3 of the 10-20 international scalp EEG system) and the left parietal cortex (P3 of the 10-20 international scalp EEG system, with a return electrode in Cz) for 20 minutes. The phase difference between the two stimulation sites will be 0°.

tACS is a non-invasive stimulation technique that works by delivering a weak sinusoidally oscillating electrical current to the surface of the skull to entrain oscillations in the brain.

Comparatore fittizio: Sham prefronto-parietal tACS

The same stimulation as in in-phase transcranial Alternative Current Stimulation tACS (6 Hz F3 and P3 stimulation with 0° phase difference) will start with a current intensity of 1000 μA lasting for 30 seconds. Afterwards, the intensity will progressively decrease over 20 seconds until cessation. The whole session duration is 20 minutes.

tACS is a non-invasive stimulation technique that works by delivering a weak sinusoidally oscillating electrical current to the surface of the skull to entrain oscillations in the brain.

Sperimentale: 2 mA left prefrontal tDCS

2000 μA anodal transcranial Direct Current Stimulation (tDCS) will be applied over the left prefrontal dorso-lateral cortex (F3 of the 10-20 international scalp EEG system with a right supraorbital return electrode (Fp2 of the 10-20 international scalp EEG system) during 20 minutes.

tDCS is a form of neuromodulation method where very low levels of constant current are delivered to specifically targeted areas of the brain

Comparatore fittizio: Sham left prefrontal tDCS

The same stimulation as active transcranial Direct Current Stimulation (tDCS) (anodal F3 and return in Fp2) will start at 2 mA intensity for 30 seconds. Afterwards, the intensity will progressively decrease over 20 seconds until cessation. The whole session duration is 20 minutes.

tDCS is a form of neuromodulation method where very low levels of constant current are delivered to specifically targeted areas of the brain

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
State of consciousness
Lasso di tempo: Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)

Change of the Coma Recovery Scale-Revised scores (CRS-R, Giacino et al. Neurology 2002 and Kalmar et al., Neuropsychol Rehabil 2005) between before and after stimulation (CRS-R post stimulation - CRS-R before stimulation). The CRS-R score is a qualitative and quantitative scales ranking predefined behaviors elicited by the patients in the following six subscales, auditory function, visual function, motor function, verbal and oromotor function, communication and wakefulness, the sum of which give a total score ranging from 0 to 23. Higher values of the scale mean a better state of consciousness. This change in state of consciousness will be compared between active stimulation and sham stimulation

Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Evoked response potential during local-global paradigm
Lasso di tempo: Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)

Change of the ERPS recorded during the "local global" auditory paradigm (Bekinschtein et al., PNAS 2009)

Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)
Resting state EEG
Lasso di tempo: Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)

Change from baseline of the multivariate automatic classification of conscious state from EEG (Sitt et al., Brain et al. 2014)

Two time points: immediately before (baseline) and immediately after stimulation (post-stimulation)

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Investigatori

  • Investigatore principale: Bertrand Hermann, MD, CR-ICM U 975 /UMRS INSERM 1127
  • Investigatore principale: Jacobo D Sitt, MD, PhD, CR-ICM U 975 /UMRS INSERM 1127
  • Investigatore principale: Lionel Naccache, MD, PhD, CR-ICM U 975 /UMRS INSERM 1127

Pubblicazioni e link utili

La persona responsabile dell'inserimento delle informazioni sullo studio fornisce volontariamente queste pubblicazioni. Questi possono riguardare qualsiasi cosa relativa allo studio.

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

19 novembre 2018

Completamento primario (Effettivo)

31 ottobre 2022

Completamento dello studio (Effettivo)

3 gennaio 2024

Date di iscrizione allo studio

Primo inviato

11 giugno 2018

Primo inviato che soddisfa i criteri di controllo qualità

21 giugno 2018

Primo Inserito (Effettivo)

3 luglio 2018

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

23 settembre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

18 settembre 2026

Ultimo verificato

1 gennaio 2019

Maggiori informazioni

Termini relativi a questo studio

Altri numeri di identificazione dello studio

  • C17-56
  • 2017-A02763-50 (Identificatore di registro: ID RCB)

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

NO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .