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Abstract:
Insulin shock therapy was a psychiatric treatment popular from the 1930s to the 1950s, primarily for schizophrenia. Developed by Manfred Sakel, the procedure involved administering high doses of insulin to induce daily comas over several weeks. Proponents initially claimed success rates exceeding 80%, but these claims were, as far as I can tell, baseless and likely reflected spontaneous remission rates and selection bias. The underlying theories for its mechanism were erroneous. The treatment carried severe risks, including brain damage, obesity, and a mortality rate of 1-5%. Its use declined sharply in the late 1950s after controlled trials demonstrated it had no specific therapeutic effect beyond a placebo and was significantly more dangerous than the newly introduced neuroleptic drugs. Modern analysis suggests its adoption was driven by a lack of alternatives and the desire for psychiatry to appear more like a legitimate medical discipline.
Insulin Shock Therapy: An Overview of a Discredited Practice
Core Concept: A psychiatric treatment where patients, mostly with schizophrenia, were injected with large insulin doses to deliberately induce daily comas and sometimes convulsions, typically for about two months.
Origins: Introduced in 1927 by Manfred Sakel, who observed a patient's mental state improve after an accidental insulin-induced coma. It became widespread in the US and Europe by the 1940s.
Purported Efficacy: The treatment's effectiveness was never substantiated. Initial claims of high success rates were unsupported by evidence. Controlled studies in the 1950s showed it was no better than barbiturate-induced comas, meaning the insulin itself had no specific effect.
Severe Risks: The procedure was extremely dangerous. Risks included irreversible coma leading to brain damage (which some practitioners disturbingly re-framed as a "therapeutic improvement"), convulsions, and death. The mortality rate was estimated to be between 1% and 5%. Patients also experienced significant weight gain.
Decline and Abandonment: The therapy was discredited by critical papers and controlled trials in the 1950s. The introduction of safer, more effective neuroleptic drugs like chlorpromazine made the high-risk, labor-intensive insulin coma procedure obsolete by the 1960s.
Modern Interpretation: Its historical acceptance seems to be a product of desperation. It provided psychiatrists with a "medical" intervention in an era with few options, and the intensive care and attention given to patients may have been the only beneficial component. It's now widely considered an unscientific and inhumane chapter in psychiatry's history.