NCT03602716

High-Definition Transcranial Direct Current Stimulation as a Treatment of Negative Symptoms of Schizophrenia

A Research on High-Definition Transcranial Direct Current Stimulation as a Treatment of Negative Symptoms in Patients With Schizophrenia

• Status: Terminated
• Phase: N/A
• Study type: Interventional
• Enrollment: 12 (actual)
• Sponsor: Shanghai Mental Health Center · Academic / Other
• Sex: All
• Age: 18 Years – 60 Years
• Healthy volunteers: Not accepted

Summary

In this study, investigators designed a double-blind randomized trial to prove a more reliable evidence to show how the treatment by using high-definition transcranial direct current stimulation (HD-tDCS) can relieve negative symptoms in patients with predominant negative symptoms of schizophrenia, especially on improving participants' anhedonia condition and social cognition, through stimulating the left dorsolateral prefrontal cortex (DLPFC). Participants will be divided into active and sham HD-tDCS groups equally.

Detailed description

Schizophrenia is one of the most disabling psychiatric disorders that almost 1% worldwide population suffer from this devastating illness. The clinical expression of this illness has been categorized into different dimensions, though most of the patients are well treated with antipsychotic medication, the negative symptom is still one of the very refractory symptoms. Emerging evidence shows that transcranial direct current stimulation (tDCS) is a promising treatment for schizophrenia negative symptoms, however, findings are still controversial. HD-tDCS can provide a more stable and accurate direct current comparing with traditional tDCS, which gives a hope to treat negative symptoms in a more reliable way. An association between negative symptoms and grey matter reductions in the prefrontal cortex is found, moreover, even during rest, hypoactivity of the prefrontal cortex, particularly of the left dorsolateral, and of the anterior cingulate regions, has been linked to negative symptoms of schizophrenia. It has been observed that tDCS could relatively alleviate negative symptoms in patients with schizophrenia by stimulating the left DLPFC through an anodal electrode, which has been proved can also modulate brain functional connectivity and have clinical improvements. Half of the participants with a clinical presentation of predominant negative symptoms will be stimulated by active HD-tDCS and the rest will have a sham stimulation. HD-tDCS is going to be delivered at 1.5 mA intensity for 20 minutes once a day; sessions will be performed on 10 days 5 consecutive weekdays with sustained effects at 1 (T2) and 3 (T3) months. A Soterix Medical 4x1 HD-tDCS will be used with the anode placed over the left DLPFC (F3), surrounded by four cathodal electrodes at F5, F1, FC3 and AF3, based on the 10/20 international EEG system. All the outcomes will be assessed at baseline (T0, before HD-tDCS sessions), one day after the 10th HD-tDCS sessions (T1), and also at T2 and T3. Both participants and investigators will be blind to this treatment.

Conditions

• Schizophrenia

Interventions

Type	Name	Description
DEVICE	HD-tDCS	HD-tDCS is going to be delivered at 1.5 mA intensity for 20 minutes once a day (+15 s fade-in and fade-out); sessions will be performed on 10 days 5 consecutive weekdays with sustained effects at T1 and T2. HD-tDCS will be used with the anode placed over the left DLPFC (F3) surrounded by four cathodes at F5, F1, FC3, and AF3 based on the 10/20 international EEG system.
DEVICE	Sham HD-tDCS	HD-tDCS is going to be used with the anode placed over the left DLPFC (F3) surrounded by four cathodes at F5, F1, FC3, and AF3 based on the 10/20 international EEG system; sessions will be performed on 10 days 5 consecutive weekdays with sustained effects at T1 and T2. This group will have a 20-min-sham stimulation.

Timeline

• Start date: 2018-10-16
• Primary completion: 2020-09-26
• Completion: 2020-09-26
• First posted: 2018-07-27
• Last updated: 2021-08-24

Locations

1 site across 1 country: China