- ICH GCP
- Registro degli studi clinici negli Stati Uniti
- Sperimentazione clinica NCT02823639
Efficacy and Mechanisms of Transcranial Direct Current Stimulation (tDCS) - Effects on Working Memory in Schizophrenia
Impairments of cognition are a core, severely disabling feature of schizophrenia leading to poor long-term outcome with no established treatment available.
Particularly impaired executive functions (e.g working memory) are frequently observed and are consistently associated with reduced activation of the dorsolateral prefrontal cortex (dlPFC). Deficits in those functions have been shown to be closely related to negative symptoms, thought disorder, and functional outcome in schizophrenia leading to the notion that frontal lobe dysfunction is crucially important in schizophrenic psychopathology.
Noninvasive brain stimulation like tDCS can enhance executive functions like working memory in healthy subjects as well as in patients. To identify the optimal parameters for this intervention in patients with schizophrenia, the investigators first test the effects of different polarities (anodal, cathodal), stimulation intensities (1mA, 2mA) and laterality (left, right) on working-memory performance (nback task) in a sham-controlled cross-over design (n=128). To elucidate mechanisms of action, oscillatory brain activity will be registered with electroencephalography (EEG).
These experiments will provide reliable data for an evidence-based development of new clinical interventions to improve treatment of cognitive deficits in patients with schizophrenia and thus enhance schizophrenia prevention and recovery.
Panoramica dello studio
Stato
Intervento / Trattamento
Descrizione dettagliata
Working hypothesis:
In patients with subacute schizophrenia, transcranial direct current stimulation (tDCS) to the dorsolateral prefrontal cortex (dlPFC) exerts lasting beneficial effects on working-memory performance.
Research question(s):
In patients with remitted early phase schizophrenia, this research project aims at providing evidence for:
i) immediate improvement of working-memory performance by application of tDCS to the dlPFC in patients with schizophrenia; ii) determination of the optimal stimulation polarity, dosage and localization; iii) neurophysiological mechanisms (modulation in oscillatory activity and functional connectivity) and predictors of tDCS effects; iv) modulating effect of gender on the malleability of executive functions with tDCS.
Previous work of the investigators:
The investigators have provided proof-of principle evidence for persisting improvement of cognitive planning by a polarity-specific learning-stage dependent coupling of training and stimulation. The investigators have demonstrated that working memory and deficient cognitive control can be enhanced with anodal tDCS in depression and that the effects of tDCS are modulated by genetic polymorphisms. The investigators were the first to show impaired cortical plasticity following tDCS in schizophrenia patients at different disease states. Finally, the investigators have just successfully finished the world-wide largest clinical trial investigating the efficacy of non-invasive brain stimulation (rTMS) on negative symptoms in schizophrenia (DFG 241/10-1, Falkai, Hasan).
- Aims and work plan:
To examine the potential of tDCS for the improvement of working memory with remitted schizophrenia the investigators are following this work plan:
I) Immediate effects on performance:
Assessment of efficacy of tDCS polarity (anodal, cathodal), dosage (1mA, 2mA) and laterality (left and right dlPFC) on working memory (adaptive n-back(6)) in patients (n=2x2x2x16=128). In a two-session cross-over design, stimulation (tDCS and sham) will be applied to the dlPFC (left or right) for 20min (during task performance).
Tipo di studio
Iscrizione (Anticipato)
Fase
- Non applicabile
Contatti e Sedi
Contatto studio
- Nome: Christian Plewnia, MD
- Numero di telefono: ++49 (0)7071-2986121
- Email: christian.plewnia@uni-tuebingen.de
Luoghi di studio
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Muenchen, Germania
- Reclutamento
- LMU Muenchen, Department of Psychiatry and Psychotherapy
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Contatto:
- Alkomiet Hasan, MD
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Tuebingen, Germania, 72076
- Reclutamento
- University Hospital Tuebigen, Department of Psychiatry and Psychotherapy
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Contatto:
- Christian Plewnia, MD
- Numero di telefono: +49 7071 29 86121
- Email: christian.plewnia@uni-tuebingen.de
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Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
Accetta volontari sani
Sessi ammissibili allo studio
Descrizione
Inclusion Criteria:
- diagnosed schizophrenia (DSM-V)
- age (18 - 60 years)
- right handedness
- stable medication during 1 week of treatment and 1 week before
Exclusion Criteria:
- history of seizures
- metal device throughout the body
- pregnancy
- use of anticonvulsive medication
- use of benzodiazepines more than 1 mg of Lorazepam equivalent
- current substance abuse (nicotine excluded)
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Scienza basilare
- Assegnazione: Randomizzato
- Modello interventistico: Assegnazione incrociata
- Mascheramento: Doppio
Armi e interventi
Gruppo di partecipanti / Arm |
Intervento / Trattamento |
|---|---|
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Comparatore attivo: Transcranial direct current stimulation
tDCS with varying intensity, location and polarity
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Altri nomi:
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Comparatore placebo: Sham stimulation
Double blind sham stimulation with sham mode of neuroConn device
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Altri nomi:
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Change of dprime
Lasso di tempo: Assessment during stimulation in a n-back task at three specific timepoints during one week
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dprime provides the separation between the means of the signal and the noise distributions, compared against the standard deviation of the signal plus noise distributions
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Assessment during stimulation in a n-back task at three specific timepoints during one week
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Misure di risultato secondarie
Misura del risultato |
Lasso di tempo |
|---|---|
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Change of reaction time in n-back task
Lasso di tempo: Assessment during stimulation in a n-back task at three specific timepoints during one week
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Assessment during stimulation in a n-back task at three specific timepoints during one week
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Collaboratori e investigatori
Sponsor
Collaboratori
Investigatori
- Investigatore principale: Christian Plewnia, Prof., MD, University Hospital Tuebingen, Department of Psychiatry and Psychotherapy
Studiare le date dei record
Studia le date principali
Inizio studio
Completamento primario (Anticipato)
Completamento dello studio (Anticipato)
Date di iscrizione allo studio
Primo inviato
Primo inviato che soddisfa i criteri di controllo qualità
Primo Inserito (Stima)
Aggiornamenti dei record di studio
Ultimo aggiornamento pubblicato (Effettivo)
Ultimo aggiornamento inviato che soddisfa i criteri QC
Ultimo verificato
Maggiori informazioni
Termini relativi a questo studio
Termini MeSH pertinenti aggiuntivi
Altri numeri di identificazione dello studio
- 01EE1407H
Piano per i dati dei singoli partecipanti (IPD)
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Informazioni su farmaci e dispositivi, documenti di studio
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