MedPath

HD-tDCS for Hallucinations

Not Applicable
Not yet recruiting
Conditions
Schizophrenia
Hallucinations
Interventions
Procedure: High-definition transcranial direct current (HD-tDCS), active condition
Procedure: High-definition transcranial direct current (HD-tDCS), sham condition
Registration Number
NCT06208176
Lead Sponsor
Hôpital le Vinatier
Brief Summary

One in three patients with schizophrenia experiences hallucinations that are refractory to conventional pharmacotherapy. For refractory auditory hallucinations, transcranial direct current stimulation -tDCS- has been proposed as a novel therapeutic approach. Although promising beneficial effects on auditory hallucinations have been found by targeting the left frontal and temporoparietal cortex, the high variability observed in clinical response leaves much room for optimizing stimulation parameters. For instance, options should go beyond the left temporoparietal junction as a unique and single target of hallucinations, taking into account the personalization of the targeting based on the actual brain networks involved in hallucinations, including those beyond the auditory modality, as well as multimodal hallucinations.

The present study will take advantage of recent technological developments to propose a personalized therapeutic strategy to alleviate hallucinations in schizophrenia. This will involve:

* the simultaneous targeting of multiple brain regions with High-Definition (HD)-tDCS, which is known for its precise and longer-lasting effects compared to conventional tDCS.

* and the fMRI-capture of hallucinations, using a precise and reliable data-driven approach to identify the functional brain networks recruited during hallucinations.

The aim of the study is to assess whether repeated sessions of HD-tDCS guided using the fMRI capture of hallucinations can reduce multimodal hallucinations in patients with schizophrenia, compared to sham sessions of HD-tDCS.

Detailed Description

The study is a multicentre, prospective, randomised, double-blind, parallel group, sham-controlled, two-arm clinical trial. Arm one is repeated active HD-tDCS guided using the fMRI-capture of hallucinations (20 sessions of stimulation over 10 days, 20 min/session). Arm two is the blinded sham repeated HD-tDCS guided by the fMRI-capture of hallucinations (20 sessions of sham stimulation over 10 days, 20 min/session).

Recruitment & Eligibility

Status
NOT_YET_RECRUITING
Sex
All
Target Recruitment
46
Inclusion Criteria
  • Females and males aged between 18 and 50
  • Diagnosis of schizophrenia according to DSM 5.0 criteria
  • Presence of dailyfrequent hallucinations (> 2 / hour) despite the optimization of the antipsychotic dosage and molecule (based on the prescriber's judgment) for at least 6 weeks. The presence of such daily frequent refractory hallucinations will be operationalized by an interview with a trained psychiatrist.
  • Patient under curatorship/guardianship or not
  • Covered by a public health insurance
  • Understanding French language
  • Signed written informed consent after being informed about the study
Exclusion Criteria
  • Other disabling Axis Inpsychiatric conditions including a current diagnosis of a major depressive episode (uni- or bi- polar disorder) according to DSM 5, and substance use disorder (except tobacco)
  • Use of hallucinogenic drugs
  • Contraindications for magnetic resonance imaging or tDCS (neurologic stimulator, pacemaker, cardiac defibrillator, cardiac prosthesis, vascular prosthesis, intracranial clips or clamps, cerebrospinal fluid derivation, metallic splinters in the eyes, cochlear implants, severe claustrophobia)
  • Changes in the total PSAS and PANSS score of at least 15% between screening/inclusion (T0) and baseline visits (T1). This criterion will ensure the stability of symptoms before treatment.
  • Pregnancy (controlled by urine pregnancy test in women of childbearing potential) or breastfeeding
  • A clinical condition requiring inpatient procedure under constraint

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
active stimulation groupHigh-definition transcranial direct current (HD-tDCS), active condition23 patients will receive 20 sessions of active HD-tDCS
placebo stimulation groupHigh-definition transcranial direct current (HD-tDCS), sham conditionHigh-definition transcranial direct current (HD-tDCS), sham condition
Primary Outcome Measures
NameTimeMethod
Changes in hallucinations6 months

Comparison between the active HD-tDCS group and the sham HD-tDCS group of the change in multimodal hallucinations between baseline (V1, within 1 week before the first HD-tDCS session) and after the 20 HD-tDCS sessions (V2, within 1 week of the last HD-tDCS session). Change in hallucinations will be measured as the percentage change in score on the Psychosensory Hallucination Scale

Secondary Outcome Measures
NameTimeMethod
Long-term changes in hallucinations6 months

Comparisons between active and sham HD-tDCS groups of the change in multimodal hallucinations (assessed with the PSAS, in percent) between baseline and follow-up assessments at one month and three months after the 20 sessions of HD-tDCS.

Changes in source-monitoring performance6 months

Source monitoring performance will be evaluated using a specific source monitoring task. Source-monitoring accuracy scores (range 0-100) will be calculated as proportions of accurate source attributions for each source

Changes in brain connectivity6 months

Comparisons between active and sham HD-tDCS groups of changes in brain connectivity within the hallucination-related network, measured with fMRI

Change in social functioning6 months

Comparisons between active and sham HD-tDCS groups of change in social functioning measured by the Social and Occupational Functioning Assessment Scale - SOFAS (Goldman et al., 1992) between baseline (V1, within 1 week before first stimulation) and follow-up assessments, one month (V3) and three months (V4) after the intervention

Change in symptoms of schizophrenia6 months

Comparisons between active and sham HD-tDCS groups of the change in other symptoms of schizophrenia between baseline (V1, within 1 week before first stimulation) and post-intervention (V2, within 1 week after last stimulation), and follow-up assessments (V3: at one month, V4: at 3 months). Symptoms of schizophrenia will be measured by the total score at the Positive and Negative Syndrome Scale - PANSS , and by the scores in the five subdimensions of the PANSS (positive, negative, depression, disorganization, and grandiosity/excitement).

Trial Locations

Locations (1)

Centre Hospitalier le Vinatier

🇫🇷

Bron, France

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