Home-Based Transcranial Direct Current Stimulation In Major Depressive Disorder (HOME)

Current pharmacotherapy and psychotherapy treatments for major depressive disorder (MDD) often fall short in efficacy and patient satisfaction, highlighting a critical need for innovative, effective and acceptable treatment options. Transcranial direct current stimulation (tDCS) has emerged as a promising treatment, offering a non-invasive method to modulate brain activity and alleviate depressive symptoms that can be provided at home. This trial builds on our work and aims to evaluate the effectiveness and cost-effectiveness of home-based tDCS as a treatment for MDD in the NHS. The trial is a multi-centre pragmatic RCT to evaluate the real-life clinical effectiveness and cost-effectiveness of tDCS combined with treatment as usual (TAU) as compared to TAU alone following a 10-week treatment period and at a 6-month follow up. Depressive symptoms will be measured by the clinician-rated Montgomery-Åsberg Depression Rating Scale (MADRS). We will further assess impact on self-report depressive symptoms, anxiety symptoms, remission, acceptability and quality of life. We will conduct in-depth process evaluation, economic evaluation, and implementation work to investigate operational challenges of integrating home-based tDCS into existing NHS care pathways and to inform scalability in primary care settings. 438 Participants will be aged 18 years or over, diagnosed with MDD with at least moderate severity of depressive symptoms and medication free or taking stable antidepressant medication or in psychotherapy for at least 6 weeks before enrolment. Participants will be randomly assigned in a 1:1 ratio to either TAU or TAU+tDCS. Participants randomised to the TAU treatment arm will continue with standard care including psychotherapy and/or antidepressant medication, as decided by participant and treating clinician. Participants randomised to the tDCS treatment arm will use a tDCS device which is a headset with the anode positioned over left dorsolateral prefrontal cortex (DLPFC) and cathode over right DLPFC (EEG positions F3 and F4, respectively). Treatment protocol consists of 5 tDCS sessions per week for 3 weeks followed by 3 tDCS sessions per week for 7 weeks, for a total of 36 sessions in 10 weeks. tDCS stimulation is 2 mA for 30 minutes with gradual ramp up over 30 seconds at the start and end of each session. The primary outcome is the difference in depressive symptoms between treatment arms at 10-week end of treatment as measured by MADRS and the key secondary outcome is the long term clinical effectiveness as measured by difference in depressive symptoms between treatment arms at 6-month follow up as measured by MADRS. After the 6-month follow up, a 3-month extension follow up phase will give all participants the opportunity to use the tDCS device. This research addresses an unmet need for new treatment options for MDD, thereby benefiting people with MDD, improving NHS care pathways, and expanding scientific knowledge.