In the early 20th century, shock therapies developed worldwide as the most effective means to treat severe mental illness. In 1927, Manfred Sakel introduced the newly discovered insulin as a means to treat opioid-addicted patients, by relieving withdrawal symptoms. After noticing that some psychotic patients notably recovered from their psychotic symptoms after accidental insulin comas, he extended this technique to schizophrenic patients, arguing that up to 70% of his patients improved with this therapy. Insulin shock therapy soon spread all-over the world and became one of the most important treatments for severe mental illness. Regardless of the high-rate complications, insulin shock therapy only declined after the introduction of anti-psychotic drugs.

Description of a clinical case.

Non-systematic review of literature and case report.

A 70-year-old female with type-1 bipolar disorder and type-2 diabetes was referred to a psychiatry emergency department (ED) for 2-week behavioral disorder, featuring restlessness, agitation, insomnia, verbiage and persecutory delusions. In the ED, she presented calm, cooperating, with a subtle humor elation and slight disinhibition. The speech was somewhat confusing, but with normal debit. Delusional thought or hallucinations were not evident. Severe hypoglycemia was first detected by capillary glucose measurement and confirmed by a blood test. After the blood glucose was corrected she became gradually more restless, talkative, disinhibited, with clear humor elation, compatible with a manic state.

We discuss if this case might be explained by the severe hypoglycemia and its correction, linking it to insulin shock therapy, reviewing this procedure's history, controversies and current developments.

The authors have not supplied their declaration of competing interest.