Brain Stimulation Therapies

Brain Stimulation Therapies - ECT: Shockingly Good Results

Electroconvulsive Therapy (ECT): Induced seizure under anesthesia/muscle relaxation. Rapid, effective for severe mood disorders.

• Key Indications (Mood):
  • Severe Depression (suicidal, psychotic, catatonia, food refusal).
  • Treatment-Resistant Depression (TRD).
  • Severe Mania/Mixed Episodes.
• Procedure Highlights:
  • Anesthesia + Succinylcholine.
  • Placements: Bitemporal (max efficacy), RUL (Right Unilateral - ↓ cognitive SEs).
  • Stimulus: Brief pulse; Seizure: motor >15s, EEG >25s.
  • Course: 2-3x/week, 6-12 sessions.
• Common Adverse Effects (AEs):
  • Headache, myalgia, confusion.
  • Memory impairment (anterograde > retrograde, often transient).
• Contraindications:
  • Absolute: ↑ICP.
  • Relative: Recent MI/CVA, pheochromocytoma.

⭐ ECT is highly effective for severe depression with psychotic features or acute suicidality.

Brain Stimulation Therapies - TMS: Magnetic Mind Makeover

• Mechanism: Non-invasive; magnetic fields induce electrical currents, modulating neuronal activity in targeted brain regions like the prefrontal cortex.
• Types & Targets (MDD):
  • Repetitive TMS (rTMS):
    • High-Frequency (HF): Stimulates left DLPFC.
    • Low-Frequency (LF): Inhibits right DLPFC.
  • Deep TMS (dTMS): Reaches deeper structures.
• Indications: FDA-approved for treatment-resistant MDD, OCD.
• Advantages: No anesthesia, good safety profile, fewer cognitive side effects than ECT.
• Side Effects: Scalp discomfort, headache. ⚠️ Seizure risk very low (<0.1% for rTMS).
• Contraindications: Metallic implants (head/neck), pacemakers, history of seizures (relative).

⭐ TMS typically involves daily sessions for 4-6 weeks for an acute course in MDD.

coil placement on head for depression treatment)

Brain Stimulation Therapies - VNS/DBS/MST/tDCS: Novel Neural Navigators

• Various neuromodulation techniques for treatment-resistant mood disorders, altering brain activity.

⭐ DBS for TRD often targets the subcallosal cingulate gyrus (SCC) or ventral capsule/ventral striatum (VC/VS).

Brain Stimulation Therapies - BST Choice: Stimulating Decisions

• Electroconvulsive Therapy (ECT):
  • Indications: Severe depression, mania, catatonia, psychosis, high suicide risk, Neuroleptic Malignant Syndrome (NMS).
  • Contraindications: ↑ Intracranial Pressure (ICP).
  • SE: Headache, amnesia (anterograde > retrograde).
  • Efficacy: Highest for severe depression (~80%).
• Repetitive Transcranial Magnetic Stimulation (rTMS):
  • Indications: Moderate depression, failed ≥1 antidepressant.
  • SE: Scalp pain, headache; rare: seizure.
• Vagus Nerve Stimulation (VNS):
  • Indications: Treatment-resistant depression (TRD) (adjunct).
  • SE: Hoarseness, cough, dyspnea.
• Deep Brain Stimulation (DBS):
  • Indications: Severe, intractable TRD, Obsessive-Compulsive Disorder (OCD) (investigational).
  • SE: Surgical risks, paresthesia, dysarthria.

⭐ ECT is the most effective treatment for severe major depression, especially with psychotic features or catatonia.

High‑Yield Points - ⚡ Biggest Takeaways

• ECT is gold standard for severe depression with suicidality or psychotic features.
• Bilateral ECT: more effective, more cognitive side effects (amnesia); Unilateral ECT: less so.
• Raised ICP is a major relative contraindication for ECT.
• rTMS: non-invasive for treatment-resistant depression (TRD), fewer cognitive side effects than ECT.
• VNS: adjunctive therapy for TRD and refractory epilepsy.
• DBS: investigational for severe, refractory OCD and depression.
• MST: magnetic seizure induction; aims for ECT efficacy, fewer cognitive effects.