The mystery of why a controlled seizure treats severe depression

Science · Published 28 October 2026 Swipe more like this →

In short: For nearly a century, electroconvulsive therapy (ECT) has remained one of the most potent tools in psychiatry. While it works faster and more effectively than most medications for treatment-resistant depression, scientists still cannot definitively say whether the healing power lies in the electricity itself, the resulting seizure, or a complex interaction of both.

ECT is primarily reserved for severe mental illnesses that have not responded to psychotherapy or medication, such as refractory depression, catatonia, and certain phases of bipolar disorder. It is also used for schizophrenia and specific conditions like neuroleptic malignant syndrome. The treatment is specifically not recommended for anxiety disorders or most other psychiatric conditions. It is also rarely effective for children between the ages of 11 and 18. If a child over 11 is considered, a formal second opinion is mandatory. Furthermore, it is not indicated for use in children under 11 years old.

Due to its role as a final option for critical emergencies or acute crises, patients receive a series of sessions, generally occurring two times weekly over a period of three to seven weeks. Medical professionals may suggest this intervention if a patient's condition is life-threatening or causing extreme distress. It is also a viable option if the individual has responded well to the procedure in previous years. Doctors must carefully evaluate the risks of general anesthesia and the patient's specific medical history before proceeding.

The procedure is performed under general anesthesia with a muscle relaxant to ensure the patient remains still while the brain is stimulated with short electric pulses. This induces a controlled seizure lasting about 30 to 40 seconds. Clinical data from 2023 indicates high success rates: 67% of patients reported being "much improved" or "very much improved" by the end of treatment, while only 1% were "much worse.", The procedure can lead to side effects such as nausea, headache, disorientation, and skin burns. Patients may also experience amnesia or memory loss as a result of the treatment. Research suggests that modifying how much electricity is administered and where it is directed can improve cognitive outcomes. These technical adjustments aim to balance therapeutic efficacy with a reduction in adverse effects.

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