Functional Neurosurgery: Applications of Deep Brain Stimulation

Functional neurosurgery aims to modulate dysfunctional neural circuits to alleviate neurological and psychiatric disorders, with deep brain stimulation (DBS) representing one of its most transformative advancements. The foundations of DBS evolved from early cortical stimulation experiments and stereotactic techniques developed in the late nineteenth and twentieth centuries, gradually shifting from ablative procedures to chronic neuromodulation. Advances in imaging, stereotactic navigation, and implantable device technology have expanded the clinical applications of DBS beyond movement disorders. Currently, DBS is an established treatment for Parkinson’s disease, essential tremor, dystonia, epilepsy, and selected psychiatric conditions such as treatment-resistant obsessive–compulsive disorder. The procedure relies on meticulous patient selection, multidisciplinary evaluation, precise stereotactic electrode placement, and continuous postoperative programming to maximize therapeutic benefit while minimizing adverse effects. Despite its efficacy, DBS is associated with surgical, neurological, psychiatric, and device-related complications that require careful monitoring. Recent innovations—including adaptive and closed-loop stimulation systems, directional leads, advanced neuroimaging techniques, and teleprogramming—are enhancing precision, safety, and personalization of therapy. Ongoing research continues to explore novel indications and the potential role of DBS in neuroregenerative medicine, positioning it as a cornerstone of future functional neurosurgical practice.