A recent study found that unsupervised home-use brain stimulation combined with digital psychological interventions was not more effective than placebo treatments in alleviating symptoms of major depression. This finding challenges the current understanding of home-based mental health treatments and opens new questions about the most effective ways to treat this widespread condition. The research has been published in JAMA Psychiatry.
The study was motivated by the urgent need to find effective treatments for major depression, a condition affecting over 300 million people worldwide. Traditional treatments, such as antidepressant drugs, cognitive behavioral therapy, and noninvasive brain stimulation, have limitations.
For instance, a significant portion of patients does not respond to medications, and other treatments like cognitive therapy are not always accessible. Noninvasive brain stimulation methods such as transcranial magnetic stimulation are costly and require daily clinic visits, while electroconvulsive therapy has associated neurocognitive effects.
Transcranial direct current stimulation (tDCS) emerged as a promising alternative. It’s a noninvasive technique that involves applying low electrical currents through electrodes placed on the scalp. This method, known for being portable, simple, and inexpensive, was thought to potentially offer an accessible treatment option if it could be effectively administered at home.
The study, known as the Portable Transcranial Electrical Stimulation and Internet-Based Behavioral Therapy for Major Depression Study (PSYLECT), was conducted from April 2021 to October 2022. It involved 210 participants, mostly female, with an average age of 38.9 years, representing a diverse racial background. These participants were diagnosed with major depression and were in the midst of a depressive episode.
Participants were randomly assigned to one of three groups: a ‘double active’ group receiving tDCS and a digital psychological intervention, a ‘tDCS only’ group receiving tDCS and a digital placebo, and a ‘double sham’ group receiving sham tDCS and a digital placebo. The tDCS sessions were conducted at home using a special headset and were to be performed at least 24 hours apart, 5 times a week for the first 3 weeks and then twice a week for the remaining 3 weeks.
The digital psychological intervention included modules based on behavioral therapy concepts, such as mindfulness, physical exercise, and sleep hygiene, delivered through an application. The primary outcome measure was the change in the Hamilton Depression Rating Scale (HDRS-17) scores, a commonly used tool to assess the severity of depression.
The researchers found no significant difference in the reduction of depressive symptoms between the groups receiving the active treatments and the placebo group. This was true for both the primary outcome of depression severity and secondary outcomes like response and remission rates.
Participants generally adhered well to the treatment protocols, and the treatments were deemed easy to use. However, despite these positive aspects of the trial, the main finding was clear: unsupervised home-use tDCS combined with digital therapy did not outperform placebo treatments in reducing symptoms of major depression.
“We could not show that the active interventions differed from sham in improving depressive symptoms. These findings indicate that unsupervised home use should not currently be recommended as a tDCS modality in clinical practice,” the researchers concluded.
However, the duration of the study, six weeks, might have been too short to observe the full effects of the treatment. Additionally, the fixed settings for the brain stimulation device didn’t account for individual differences among participants, which could have influenced the outcomes. The diverse socioeconomic backgrounds of the participants also suggest that the effectiveness of digital health technologies could vary across different population groups.
Looking forward, researchers emphasize the need for longer studies with more tailored approaches to tDCS. The variability in how individuals respond to digital interventions and brain stimulation highlights the complexity of treating depression and the necessity for personalized treatment strategies. As digital and remote healthcare options continue to evolve, understanding their efficacy in mental health treatment remains a crucial area of research.
The study, “Home-Use Transcranial Direct Current Stimulation for the Treatment of a Major Depressive Episode: A Randomized Clinical Trial“, was authored by Lucas Borrione, Beatriz A. Cavendish, Luana V. M. Aparicio, Matthias S. Luethi, Stephan Goerigk, Adriana M. Carneiro, Leandro Valiengo, Darin O. Moura, Juliana P. de Souza, Mariana Baptista, Valquiria Aparecida da Silva, Izio Klein, Paulo Suen, José Gallucci-Neto, Frank Padberg, Lais B. Razza, Marie-Anne Vanderhasselt, Paulo A. Lotufo, Isabela M. Bensenor, Felipe Fregni, and Andre R. Brunoni.