Electroconvulsive Therapy
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Direct answer
Electroconvulsive therapy (ECT) induces a controlled generalised seizure under short-acting general anaesthesia with a muscle relaxant to treat severe mental illness. Its strongest indications are catatonia, severe depression with psychosis, suicidality or refusal of food, mania unresponsive to drugs, treatment-resistant illness, and states where speed of response is life-saving. There is no absolute contraindication; conditions such as raised intracranial pressure are the most serious relative risks.
What you must remember
- Indications: severe depression with psychotic features, high suicide risk or food and fluid refusal; catatonia (one of the most rapid responses); mania unresponsive to drugs; treatment-resistant depression and schizophrenia; depression in pregnancy when drugs are unsuitable.
- Contraindications: none absolute; relative risks include raised intracranial pressure, recent myocardial infarction or stroke, unstable vascular aneurysm, retinal detachment, phaeochromocytoma and severe osteoporosis.
- Technique: unilateral non-dominant electrode placement minimises memory disturbance, while bitemporal placement is stronger and faster; an adequate seizure generally needs to last at least about 25 to 30 seconds, and seizure threshold rises over the course.
- Course: typically six to twelve treatments given two to three times per week; maintenance pharmacotherapy must follow to prevent relapse.
- Anaesthesia: propofol or etomidate for induction, suxamethonium for muscle relaxation, with atropine premedication; the physiological surge transiently raises blood pressure and intracranial pressure.
- Adverse effects: headache, myalgia and transient confusion are common; memory impairment — anterograde resolves quickly, retrograde largely recovers over weeks to months; mortality is extremely low and comparable to brief anaesthesia.
- Indian legal position: under the Mental Healthcare Act 2017, ECT must be given under anaesthesia with muscle relaxants, with informed consent; use in minors is restricted to exceptional circumstances with guardian consent and approval of the concerned board.
Common confusion
The recurring confusion is ECT's perceived danger versus its actual risk profile — it is among the safest treatments in psychiatry, and its memory effects are mostly transient, unlike the cognitive loss families fear. Distinguish electrode placements by outcome: unilateral non-dominant for fewer cognitive effects, bitemporal for urgency and severity. Also separate ECT from psychosurgery: ECT induces a therapeutic seizure and causes no structural brain damage, whereas psychosurgery such as anterior cingulotomy is a neurosurgical lesion reserved for the most refractory obsessive-compulsive and depressive illness.
Exam-focused takeaway
NEET-PG tests ECT as an indications-and-facts topic: a depressed patient refusing food or with nihilistic delusions, or a mute, posturing catatonic patient, makes ECT the answer; the first step in catatonia management is often a lorazepam challenge with ECT for refractory cases. Learn the relative-contraindication list with raised intracranial pressure at the top, the seizure-duration requirement, the anaesthetic and relaxant agents, unilateral versus bitemporal differences, and the Mental Healthcare Act 2017 provisions — a genuinely Indian exam favourite. Memory effects are tested as transient and largely reversible.
Frequently asked questions
What is the commonest indication for ECT?
Severe depression — especially with psychotic features, suicidality or refusal of food — with catatonia the classic indication for the fastest response.
Does ECT have an absolute contraindication?
No; raised intracranial pressure and recent cardiovascular events are the most serious relative contraindications.
Which electrode placement causes fewer memory effects?
Unilateral placement over the non-dominant hemisphere; bitemporal placement is more effective in urgent, severe illness.
Which drugs are used during ECT?
A short-acting induction agent such as propofol or etomidate, suxamethonium for muscle relaxation, and atropine premedication.
Is memory loss after ECT permanent?
No — anterograde impairment settles quickly and retrograde gaps mostly recover over weeks to months.
What does the Mental Healthcare Act 2017 say about ECT?
It requires ECT under anaesthesia with muscle relaxants and informed consent, and restricts its use in minors to exceptional, board-approved circumstances.