A new clinical study finds that deep brain stimulation (DBS) can significantly improve symptoms in adults with treatment-resistant depression. In the trial, half of the participants improved, and about one-third achieved near-complete remission.
Researchers discovered that specific brain activity, known as theta waves, in the bed nucleus of the stria terminalis (BNST) can predict how well patients respond to DBS. Lower pre-surgery theta activity and stronger connections between the BNST and the prefrontal cortex were linked to better outcomes. This insight may allow doctors to personalize DBS treatments and develop real-time, adaptive stimulation in the future.
Key Findings:
Predictive Biomarker: Lower theta activity in the BNST before surgery predicts greater improvement in depression and anxiety.
Response Rate: 13 of 26 patients improved, and 9 achieved near-complete remission.
Closed-Loop Potential: DBS reduced BNST theta activity in line with symptom relief, supporting future adaptive stimulation systems.
Deep brain stimulation involves implanting small electrodes into the brain, similar to a pacemaker. In this study, electrodes targeted the BNST and the nucleus accumbens, areas involved in stress, fear, motivation, and pleasure.
Of the 26 participants, 13 saw significant improvements in depression, anxiety, quality of life, and daily functioning. Nine patients (35% of the group) experienced near-complete remission.
The study also showed that theta activity (4–8 Hz) in the BNST correlates with the severity of depression and anxiety. Patients with lower theta activity before surgery tended to respond better to DBS. Similarly, stronger synchronization (coherence) between the BNST and prefrontal cortex predicted better treatment outcomes.
Professor Valerie Voon from the University of Cambridge said, “DBS shows real promise for treatment-resistant depression. Our study also identifies an objective brain marker to predict which patients will benefit most.”
Dr. Linbin Wang added, “Theta brainwaves could help personalize treatment. We may one day adjust stimulation in real time based on a patient’s brain activity.”
During the trial, reductions in BNST theta activity matched improvements in depression and anxiety. This opens the door for a “closed-loop” DBS system that adjusts stimulation in real time depending on brain activity.
Professor Bomin Sun, who led the study in Shanghai, said, “This is the largest study showing that DBS in the BNST and nucleus accumbens can treat severe depression. It highlights both how the brain is impaired in depression and the potential of DBS as a treatment.”
The research was funded by the National Natural Science Foundation of China, the Shanghai Science and Technology Commission, and the UK Medical Research Council.
A double-blind, randomized controlled trial is also underway, with results expected soon. These studies will provide stronger evidence for DBS as a reliable treatment for patients with severe, treatment-resistant depression.
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