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Electroconvulsive therapy (ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more →) matters because it remains the fastest and most effective treatment for a small group of patients whose illness is severe, treatment-resistant, or immediately life-threatening. ECT induces a generalised seizure (electrical activity spreading across the whole brain) under general anaesthesia and a muscle relaxant, so the patient is asleep and the body does not convulse outwardly. For example, imagine a woman with puerperal psychosis (a severe psychotic illness starting shortly after childbirth) who is refusing food and fluids: ECT can produce improvement within days, far faster than waiting weeks for medication to work. This speed is why ECT is reserved for situations where waiting for a drug to take effect would be dangerous.

ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → is given under general anaesthesia with a muscle relaxant, so the seizure is electrical and internal without outward convulsing. Indications include severe or treatment-resistant depression, catatoniaA syndrome of abnormal movement and behaviour, ranging from being frozen and unresponsive to being excessively agitated.Read more → (a syndrome of abnormal movement, mutismA complete absence of speech despite the physical ability to speak.Read more →, and stuporA state of reduced responsiveness and near-total lack of movement or speech, while remaining conscious.Read more →), puerperal psychosis, and severe maniaA period of abnormally elevated mood, energy and activity, seen in bipolar disorder.Read more → unresponsive to medication. The main adverse effect is transient memory impairment, both retrograde (loss of memories from before treatment) and anterograde (difficulty forming new memories during the course), which usually resolves over weeks. Take a patient prescribed right unilateral ECT (electrodes on one side of the head) rather than bilateral ECT: right unilateral causes fewer cognitive side effects. It may need more sessions for the same benefit. In practice, there is no absolute contraindication to ECT, but raised intracranial pressure (raised pressure inside the skull) is a serious relative caution, because the seizure briefly raises cerebral blood flow and pressure further.

• For which situation does NICE recommend considering ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → in depression?
• What happens to the seizure threshold over the course of a series of ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → treatments?
• Which statement about contraindications to ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → is accurate?

• Transcranial magnetic stimulation (TMS), non-invasive and non-convulsive, unlike ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → which requires anaesthesia and induces a generalised seizure.
• Vagus nerve stimulation (VNS), a slow-acting implanted device for treatment-resistant depression, unlike ECT's rapid effect within days.
• Deep brain stimulation (DBS), reversible intracranial electrodes for movement disorders, whereas ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → is a time-limited course of seizures rather than a permanent implant.
• Neurosurgery for mental disorder (psychosurgery): an irreversible ablative procedure, unlike ECTElectroconvulsive therapy, a treatment that uses a brief controlled seizure to relieve severe depression.Read more → which causes no permanent structural brain change.

• Patient preference alone does not establish an indication.
• Two weeks of low mood does not meet the threshold for treatment at this level.
• A mild first episode is treated with psychological therapy or an antidepressant.
• Untreated mild depression has many less invasive options.
• It changes measurably during the course.

• Identify the drug, receptor, enzyme or pharmacokinetic change named in the stem.
• Translate it into the immediate mechanism before looking at the options.
• Use timing and the adverse-effect pattern to separate the nearest alternatives.
• Check whether the question asks for mechanism, clinical consequence, monitoring or management.