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Summary Table of Somatic Neuromodulation Therapies for Depression

Therapy Mechanism of Action Indications Contraindications Advantages Disadvantages
Electroconvulsive Therapy (ECT) Induces a controlled seizure via electrical stimulation; modulates limbic and cortico-subcortical circuits. Severe, catatonic or treatment-resistant depression; used as monotherapy or in combination with medication. Patient refusal, unstable cardiovascular disease, increased intracranial pressure. Rapid onset of action; highly effective in urgent or refractory cases. Transient cognitive side effects (e.g., amnesia); requires anesthesia and specialized setting.
Repetitive Transcranial Magnetic Stimulation (rTMS) Focal electromagnetic stimulation of the dorsolateral prefrontal cortex; enhances neuronal plasticity. Treatment-resistant depression or drug intolerance; used in monotherapy or combination. History of seizures, implanted metallic devices in the skull. Non-invasive, well tolerated, outpatient procedure. Requires multiple weekly sessions; gradual effect, limited durability.
Transcranial Direct Current Stimulation (tDCS) Delivers low-intensity direct current to modulate cortical excitability. Mild to moderate depression; mostly used in combination with psychotherapy or pharmacotherapy. Electronic implants, uncontrolled epilepsy. Simple, painless, non-invasive technique. Limited clinical evidence; weaker response compared to other techniques.
Vagus Nerve Stimulation (VNS) Implanted device provides periodic vagal stimulation; modulates limbic circuits. Long-term treatment-resistant depression; used in combination with other therapies. Contraindications to surgery, cardiac conduction disorders. Potential long-term benefits; useful in refractory cases. Requires surgery; delayed clinical response; high cost.
Deep Brain Stimulation (DBS) Intracerebral electrodes stimulate limbic areas (e.g., subgenual cingulate, nucleus accumbens). Severe refractory depression; experimental use only; always in combination with other treatments. High surgical risk, unstable psychiatric comorbidity. Promising for extreme refractory cases. Highly invasive; reserved for specialized centers; efficacy still under investigation.
    References
  1. UK ECT Review Group. Efficacy and safety of electroconvulsive therapy in depressive disorders. Lancet. 361(9360), 2003: 799–808.
  2. Brunoni AR et al. Repetitive transcranial magnetic stimulation for the acute treatment of major depressive episodes. JAMA Psychiatry. 74(5), 2017: 487–495.
  3. Bikson M et al. Transcranial direct current stimulation for major depression: a general system for quantitatively assessing risk and benefit. Brain Stimul. 9(4), 2016: 641–658.
  4. Aaronson ST et al. Five-year outcome study of vagus nerve stimulation for treatment of major depressive disorder. Am J Psychiatry. 174(7), 2017: 640–648.
  5. Mayberg HS et al. Deep brain stimulation for treatment-resistant depression. Neuron. 45(5), 2005: 651–660.
  6. Holtzheimer PE et al. Subcallosal cingulate deep brain stimulation for treatment-resistant depression. Arch Gen Psychiatry. 69(2), 2012: 150–158.
  7. George MS et al. Daily left prefrontal transcranial magnetic stimulation therapy for major depressive disorder. Arch Gen Psychiatry. 67(5), 2010: 507–516.
  8. Kedzior KK et al. Repetitive transcranial magnetic stimulation (rTMS) for depression in older adults. Neuropsychiatr Dis Treat. 10, 2014: 2087–2097.
  9. Fregni F et al. Transcranial direct current stimulation (tDCS) for depression: a systematic review and meta-analysis. Psychol Med. 36(9), 2006: 1161–1170.
  10. Drevets WC et al. Neuroimaging abnormalities in the subgenual prefrontal cortex: implications for the pathophysiology of familial mood disorders. Mol Psychiatry. 13(9), 2008: 831–846.