STIM'ZO : Examining tDCS as an add-on Treatment for Persistent Symptoms in Schizophrenia

Hospices Civils de Lyon141 enrolled

Overview

This project aims to provide the proof of concept for transcranial direct-current stimulation (tDCS) in the treatment of resistant/persistent Schizophrenia symptoms. The purpose is to investigate the effect of tDCS on symptoms in schizophrenic patients demonstrating a partial response to a first frequently prescribed antipsychotic medication. An early optimization of the therapeutic strategy must constitute an important factor for prognosis. Hypothesize is that tDCS should alleviate symptoms in patients depending on the clinical characteristics. In this study, stimulation is an add-on treatment to antipsychotic medication, and will be used in a broad variety of patients, i.e. in patients with varied durations of illness, various symptoms profiles, and various levels of treatment response. This in turn will allow the determination of the extent to which results can be generalized to varied patient populations, as well as the extent to which various therapeutic targets (e.g. different symptom dimensions, cognitive performance and brain connectivity) may be improved with tDCS. Despite interesting preliminary results, our team is unable to describe optimal non-invasive brain stimulation (NIBS) response markers. This study is a randomized, double blind, controlled, French multicenter study (11 centers). The investigators plan to include 144 patients with persistent symptoms in schizophrenia. Seventy two subjects will receive active tDCS and 72 subjects will receive sham tDCS (placebo). Hypothesize is a lasting effect of active tDCS on the schizophrenic symptoms as measured by the number of responders, defined as a decrease of at least 25% of symptoms as measured by a standardized clinical scale score (PANSS) between baseline and after the 10-session tDCS regimen. Furthermore, the participants believe that an in depth understanding of the cortical effects of tDCS could constitute an important step towards improving the technique and developing treatment response markers. An analysis of the effects on cortical activity and plasticity markers could be an interesting approach.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

Interventions

Neuroconn or Neuroelectric tDCS stimulatorDEVICE

Stimulation parameters were chosen in conformity with those for the treatment of schizophrenic symptoms (Brunelin et al, 2012), adapted according to the latest data from the literature and the tDCS operating stimulator. The experimental tDCS group will receive the ACTIVE stimulation with the following parameters: oscillatory Direct Current with high frequency random noise stimulation (hf-tRNS - 100 to 500 Hz), Intensity = 2 mA, offset = + 1 mA, seance duration = 20 minutes ramp up/ramp down 30 seconds. Total number of sessions = 10 (sessions twice daily for 5 days separated by at least 2 hours for 5 consecutive weekdays).

Sham tDCSDEVICE

The control group will receive the SHAM stimulation (placebo) following the same regimen (i.e., twice daily sessions separated by at least 2 hours for 5 consecutive weekdays). Sham stimulation consists of a 20 minutes session including 40 seconds of active stimulation (same parameters as in the ACTIVE arm) at the beginning of the sessions, whatever the stimulator

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. Diagnosis of schizophrenia according to DSM 5.0 (Diagnostic and Statistical Manuel 5.0) criteria 2. Presence of symptoms despite the optimization of the antipsychotic dosage (based on prescriber's judgment) for at least 6 weeks, i.e. a dosage increase cannot be considered due to tolerability issues and/or is judged unlikely to bring sufficient clinical improvement. This will be operationalized by a minimum Negative PANSS score of 20 and at least one item scoring \> 4; OR a minimum Positive PANSS score of 20 with at least one item scoring \> 4 (e.g. delusion or hallucination), indicating persistent negative symptoms and/or persistent positive symptoms, 3. Patient under curatorship/guardianship or not 4. Age between 18 and 65 years old. 5. Covered by, or having the right to Social Security 6. Patient who understands the French language 7. Informed consent signed Exclusion Criteria: 1. Other neuropsychiatric disorders (psychiatric history will be assessed using the MINI 6.0 (Mini International Neuropsychiatric Interview 6.0)) including bipolar disorders and mood depression disorders - (NB: Patients with substance related and addictive disorders will not be excluded from the study, but these data will be carefully recorded). 2. Contraindications for tDCS (neurologic stimulator, pacemaker, cardiac defibrillator, cardiac prosthesis, vascular prosthesis, intracranial clips or clamps, cerebrospinal fluid derivation, metallic splinters in the eyes), 3. Increase in total composite PANSS score of at least 20% between screening and enrollment visits 4. Women who are pregnant 5. Patients whose clinical condition requires in patient procedure under constraint

Locations (10)

Centre Hospitalier Le Vinatier - Service de Psychiatrie Adulte

Bron, France

Centre Esquirol - CHU de Caen - Service de Psychiatrie Adulte,

Caen, France

CHU de Clermont-Ferrand - Pôle de Psychiatrie B

Clermont-Ferrand, France

Hôpital Fontan - CHRU de Lille - Pôle de Psychiatrie

Lille, France

Hôpital Edouard Herriot - Service d'Urgences Psychiatriques

Lyon, France

Hôpital de la Colombière - CHU Montpellier - Service de Psychiatrie Adulte

Montpellier, France

Centre Hospitalier Saint-Anne - Service de Psychiatrie Adultes

Paris, France

CHU de St-Etienne - Service d'Urgences Psychiatriques

Saint-Etienne, France

CHRU de Tours - Clinique Psychiatrique Universitaire

Tours, France

Centre Hospitalier Princesse Grace - Service de Psychiatrie

Monaco, Monaco

Outcomes

Primary Outcomes

Number of responders

The number of responders is based on the Positive and Negative Syndrome Scale (PANSS) score in the active and the sham group after 5 days of tDCS. According to Leucht et al (2009), response is defined as a decrease of at least 25% in the Positive and Negative Syndrome Scale (PANSS, Kay et al., 1987) score after the intervention.

Time frame: Between baseline (day 0) and after 10-sessions of tDCS regimen (day 5)

Secondary Outcomes

Positive and Negative Syndrome Scale (PANSS) score

Long-term clinical efficacy of active tDCS on schizophrenic symptoms is assessed by PANSS score measured between baseline (day 0), after 10-sessions of tDCS regimen (day 5), 1 month after tDCS (day 30), 3 months after tDCS (day 90) and 6 months after tDCS (day 180). The PANSS is a 30-item rater-administered assessment scale of the psychopathological symptoms observed in patients experiencing psychotic states, in particular schizophrenia. The items are noted from 1 to 7. It allows the calculation of the scores for three syndromic dimensions (positive, negative, and general psychopathology), both from a categorical and dimensional perspective. It is particularly recommended for determining a psychopathological profile, to look for predictive elements of an evolution, and to evaluate the respective efficacies of diverse therapeutic strategies.