Cyanide is a powerful poison which cause inhibition of mitochondrial cytochrome oxidase system. Cyanide poisining can present in a wide variety of forms such as inhalation, ingestion or injection. Dermal exposure is rare, very few case reports have been reported about cyanide. In this paper, we present an uncommon case of a suicide attempt with cyanide injection. A 91 year old man with a history of depression admitted to the emergency department after injected cyanide to himself subcutaneously. He was diagnosed with depressive disorder and hospitalized after psychiatric assessment. The psychiatric history of this patient suggests that depression in elderly can give way to serious suicides attempts. Psychiatrists interested in treatment of elderly depressed patients should do careful monitoring about suicide.
Key words: Depression, suicide, cyanide
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