Brain Stimulation in Obsessive-Compulsive Disorder (OCD): A Systematic Review

Area of Science:

• Neuroscience
• Psychiatry
• Medical Technology

Background:

• Obsessive-compulsive disorder (OCD) is a prevalent, severe, and chronic mental health condition.
• A significant unmet need exists for effective treatments for individuals with treatment-resistant OCD.
• Current therapeutic options, including pharmacotherapy and behavioral therapy, are insufficient for some patients.

Purpose of the Study:

• To systematically review the efficacy of various brain stimulation techniques as adjunctive treatments for OCD.
• To assess the current evidence base for different neuromodulation modalities in managing refractory OCD.
• To identify promising brain stimulation techniques and areas for future research in OCD treatment.

Main Methods:

• Comprehensive literature search across six major databases (PubMed, Cochrane, Scopus, CINAHL, PsycINFO, Web of Science).
• Inclusion of randomized controlled trials (RCTs) and data from ClinicalTrials.gov.
• Searches focused on brain stimulation techniques (magnetic stimulation, rTMS, dTMS, tDCS, electroconvulsive therapy, vagus nerve stimulation) in conjunction with OCD.

Main Results:

• Deep brain stimulation (DBS) and transcranial magnetic stimulation (TMS) demonstrated potential as add-on treatments for severe OCD.
• Low-frequency TMS over specific brain regions (supplementary motor area, orbitofrontal cortex) and targeted DBS (nucleus accumbens, ventral capsule, subthalamic nucleus) showed promising outcomes.
• Limited evidence exists for transcranial direct current stimulation (tDCS), electroconvulsive therapy, and vagus nerve stimulation, with a lack of sham-controlled studies for the latter two.
• Methodological inconsistencies and underpowered studies were noted limitations across the reviewed literature.

Conclusions:

• Brain stimulation techniques represent a promising avenue for managing refractory OCD.
• While TMS, DBS, and tDCS show potential, their clinical utility requires further investigation.
• Standardized methodologies and rigorous testing are essential to establish the role of these interventions in OCD treatment.