Schizophrenia
Conditions
Keywords
tDCS, schizophrenia, cognition, fMRI
Brief summary
This trial attempts to evaluate the effects of intensive transcranial direct-current stimulation (tDCS) on improving cognition in schizophrenia patients and changes in resting state brain network connectivity, especially increasing connectivity in the tasks related network, and increasing activation the DLPFC in a working memory task. Half of the participants will be randomized to tDCS group, while the other half will be randomized to receive sham tDCS.
Detailed description
Schizophrenia patients (SZ) show profound and persistent cognitive deficits in attention, executive processing, and verbal and visuospatial memory, which persist even after psychotic symptoms are ameliorated. Cognitive deficits may be more important in preventing functional, occupational, and social recovery in SZ than other symptom domains and are not effectively treated by current pharmacological approaches. Transcranial direct-current stimulation (tDCS) is less expensive than other modalities (e.g. repetitive transcranial magnetic stimulation; rTMS), easily available, and has a good safety profile in healthy controls (HC) and SZ. However, these prior studies did not make use of a validated measure such as the MATRICS consensus battery (MCCB), which is now established as the standard for assessing cognitive improvement in SZ. Despite these promising preliminary results, this effect of tDCS in SZ needs to be confirmed and the underlying biological mechanism elucidated. Therefore, the investigators employed MCCB to evaluate the effects on improving cognition and functional MRI to explore the underlying mechanism. Half of the participants will be randomized to tDCS group, while the other half will be randomized to receive sham tDCS. Active vs. sham treatment will be randomly using computer generated lists. Subjects and researcher-administrators of tDCS and testers or evaluators will be blind to treatment.The main cognitive outcome measure, the MCCB, will be administered at baseline and 1 day after the last tDCS session.Participants will be scanned once prior to tDCS sessions, and within one day after the 10th tDCS sessions using our Siemens 3T Verio MRI scanner.
Interventions
DEVICEtDCS
Electrodes for tDCS will have the anode placed over the left DLPFC (F3) and the cathode over the contralateral (right) supraorbital ridge. The exact location of electrodes will be determined by the 10/20 EEG method with EEG cap. Subjects will have tDCS sessions on consecutive days (weekends and holidays excluded). The tDCS group will have 10 active or sham tDCS sessions. The active group will be stimulated with a 2 mA current for 20 minutes.
DEVICESham tDCS
Electrodes for tDCS will have the anode placed over the left DLPFC (F3) and the cathode over the contralateral (right) supraorbital ridge. The exact location of electrodes will be determined by the 10/20 EEG method with EEG cap. Subjects will have tDCS sessions on consecutive days (weekends and holidays excluded). The sham tDCS group will have 10 active or sham tDCS sessions. The sham group will have stimulation lasting only 40 seconds though the electrodes will remain in place for 20 min.
Sponsors
Nathan Kline Institute for Psychiatric Research
Shanghai Mental Health Center
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 60 Years
Healthy volunteers
No
Inclusion criteria
* Subjects who have cognitive deficits as indicated by a score of \< 85 on RBANS, and meet criteria for DSM-5 diagnosis of chronic SZ, schizoaffective disorder (SA), or schizophreniform disorder (SZF), and who are stably treated with antipsychotic medications and are not in acute exacerbation of illness symptoms.
Exclusion criteria
* Patients with risk factors for an MRI scan, seizure disorder, and for women of childbearing age who are pregnant or regularly engaging in sexual activity and not regularly using an acceptable birth control method (systemic or double-barrier).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The MATRICS Consensus Cognitive Battery (MCCB) | Change from Baseline MCCB through study completion, an average of 15 days | — |
| Neuroimage changes in Magnetic Resonance Imaging (MRI) | Change from Baseline MCCB through study completion, an average of 15 days | Including T1, resting state functional MRI, task based functional MRI and Diffusion Tensor Imaging(DTI) |
Secondary
| Measure | Time frame |
|---|---|
| The CogState: Working memory and attention | through study completion, an average of 15 days |
| The Positive and Negative Syndrome Scale (PANSS) | Change from Baseline MCCB through study completion, an average of 15 days |
| Side-effects of tDCS | through study completion, an average of 15 days |
Countries
China
Outcome results
None listed