electroconvulsive therapy

electroconvulsive therapy
MeshID	D004565

electroconvulsive therapy. It is a psychiatric treatment in which a generalized seizure is electrically induced in a patient under general anesthesia to provide rapid relief from severe, treatment-resistant symptoms of certain mental disorders. Developed in the 1930s, it has evolved significantly from its early, unmodified form into a modern, regulated medical procedure primarily used for major depressive disorder, catatonia, and certain cases of bipolar disorder and schizophrenia. While its exact mechanism remains partially understood, it is considered one of the most effective acute treatments for severe depression, though it carries risks such as memory disturbances and requires careful patient selection and monitoring.

History

The origins are linked to the observation of an inverse relationship between schizophrenia and epilepsy, a concept explored by Julius Wagner-Jauregg and Ladislas J. Meduna, who pioneered chemical convulsive therapy using camphor and Metrazol. The first electrical induction of a therapeutic seizure was performed in 1938 by Italian neurologist Ugo Cerletti and his assistant Lucio Bini in Rome, drawing inspiration from observations of electrically stunned pigs at a Rome slaughterhouse. Early use was widespread and unrefined, often administered without anesthesia, as depicted in works like Ken Kesey's novel One Flew Over the Cuckoo's Nest. Significant modernization occurred with the introduction of muscle relaxants like succinylcholine and general anesthesia in the 1950s, championed by psychiatrists like Max Fink. Throughout the latter 20th century, its use declined in favor of antidepressant medications and antipsychotic drugs, but it has seen a resurgence as a treatment of last resort, with guidelines established by organizations like the American Psychiatric Association and the National Institute for Health and Care Excellence.

Medical uses

It is primarily indicated for severe, treatment-resistant major depressive disorder, particularly with psychotic features or acute suicidal risk. It is also a first-line treatment for life-threatening catatonia, regardless of the underlying diagnosis, such as schizophrenia or mood disorders. Other established uses include acute mania in bipolar disorder that has not responded to lithium or valproate, and certain forms of schizophrenia, especially when clozapine is ineffective. The World Health Organization includes it in its Model List of Essential Medicines. Treatment is typically administered in a series of sessions, and its efficacy is supported by organizations like the Food and Drug Administration, which classifies devices for treating severe depression.

Procedure

A typical session is performed in a dedicated treatment room with resuscitation equipment. The patient, under the care of a team including a psychiatrist, anesthesiologist, and nurses, receives a short-acting general anesthetic like methohexital or propofol and a muscle relaxant such as succinylcholine to prevent physical convulsions. Electrodes are placed either bilaterally on the temples or unilaterally on the right side; unilateral placement is often associated with fewer cognitive side effects. A brief electrical stimulus is delivered using a device like the Thymatron, which is calibrated to just exceed the patient's seizure threshold. Monitoring includes electroencephalography to confirm seizure activity and electrocardiography. The entire procedure, from induction to recovery, usually takes about 10-15 minutes.

Side effects and risks

Common immediate effects include headache, muscle soreness, nausea, and confusion upon awakening. The most significant and debated adverse effect involves memory problems, including retrograde amnesia for events close to the treatment period and, less commonly, anterograde amnesia. These are generally more pronounced with bilateral placement and a higher number of treatments. Rare but serious medical risks include cardiovascular complications such as arrhythmia or myocardial infarction, prolonged seizures (status epilepticus), and complications from general anesthesia. Mortality risk is very low, comparable to that of minor surgical procedures. Contraindications include recent myocardial infarction, intracranial mass lesion like a meningioma, and other conditions with high anesthetic risk.

Mechanism of action

The precise neurobiological mechanisms remain unclear and are an active area of research. Leading hypotheses suggest the induced seizure causes a "reset" of hyperconnected or dysfunctional neural networks, particularly in the limbic system. Neurochemical theories propose it affects multiple neurotransmitter systems, including increasing serotonin and dopamine transmission and modulating the hypothalamic-pituitary-adrenal axis. Neurotrophic effects are also implicated, with evidence from positron emission tomography and magnetic resonance imaging studies showing it can increase brain-derived neurotrophic factor and promote neurogenesis in the hippocampus. These changes are thought to underlie the rapid antidepressant and neuromodulatory effects observed.

Society and culture

Public perception has been heavily influenced by historical misuse and media portrayals, most famously in the film adaptation of One Flew Over the Cuckoo's Nest starring Jack Nicholson. This has contributed to significant stigma, which modern practitioners and patient advocacy groups like ECT Anonymous actively work to counter. Its use is strictly regulated by laws and medical ethics; in jurisdictions like the United Kingdom, its use under the Mental Health Act 1983 often requires a second opinion from an independent doctor. It has been referenced in various cultural works, from the writings of Sylvia Plath in The Bell Jar to television series like Monk. Ethical debates continue regarding informed consent, especially for patients under involuntary commitment, and its use in vulnerable populations.

Category:Psychiatric treatments Category:Neurology procedures Category:Medical controversies