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Electroconvulsive Therapy (ECT): Mechanism, Indications, and Safety

Electroconvulsive Therapy (ECT) is a safe, highly effective neuromodulation treatment for severe, treatment-resistant psychiatric disorders.

Mechanism of Action (Multifactorial)

  • Neurotransmitter modulation: Increases serotonin, dopamine, norepinephrine release and receptor sensitivity.
  • Neuroplasticity: Upregulates BDNF, promotes hippocampal neurogenesis, dendritic arborization.
  • Network connectivity: Normalizes hyperconnectivity in default mode network (depression) and dysconnectivity in schizophrenia.
  • HPA axis regulation: Reduces cortisol hyperactivity.
  • Anti-inflammatory: Lowers IL-6, TNF-α, CRP.
  • Seizure-induced gene expression: Immediate early genes (c-fos, Arc) → long-term synaptic changes.

Primary Indications

  • Major depressive disorder (MDD): Treatment-resistant, psychotic, catatonic, high suicide risk. Remission rates 70–90%.
  • Bipolar disorder: Severe mania, mixed states, bipolar depression.
  • Schizophrenia: Clozapine-resistant, catatonia, prominent affective symptoms.
  • Catatonia (any etiology): First-line; lorazepam challenge first.
  • Neuroleptic malignant syndrome (NMS): Adjunctive.

Procedure (Modern Modified ECT)

  1. Informed consent; pre-anesthesia evaluation.
  2. Short-acting anesthetic (methohexital, propofol) + muscle relaxant (succinylcholine).
  3. Electrodes: bilateral (bitemporal), right unilateral (RUL), or bifrontal.
  4. Stimulus: brief-pulse (0.5–1 ms), 20–120 Hz, 0.5–8 sec, dose = 1.5–6× seizure threshold.
  5. Seizure duration: 20–120 sec (motor + EEG).
  6. Recovery: 20–60 min monitoring.

Side Effects

  • Acute: Headache, nausea, myalgia, confusion (30–60 min).
  • Cognitive: Anterograde memory impairment (days-weeks); retrograde amnesia (months pre-ECT) – usually transient. RUL/bifrontal < bilateral.
  • Rare: Prolonged seizure, cardiovascular events, dental injury, aspiration.

Safety & Efficacy

  • Mortality: ~1 in 50,000 treatments (comparable to minor surgery).
  • No structural brain damage on imaging.
  • Continued pharmacotherapy + maintenance ECT prevents relapse.

ECT is a medical procedure, not "shock therapy" (stigmatizing term). It restores function when medications fail.

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