LETHAL CATATONIAS
\lˈiːθə͡l kˌatɐtˈə͡ʊni͡əz], \lˈiːθəl kˌatɐtˈəʊniəz], \l_ˈiː_θ_əl k_ˌa_t_ɐ_t_ˈəʊ_n_iə_z]\
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A neuropsychiatric disorder characterized by one or more of the following essential features: immobility, mutism, negativism (active or passive refusal to follow commands), mannerisms, stereotypies, posturing, grimacing, excitement, echolalia, echopraxia, muscular rigidity, and stupor; sometimes punctuated by sudden violent outbursts, panic, or hallucinations. This condition may be associated with psychiatric illnesses (e.g., SCHIZOPHRENIA; MOOD DISORDERS) or organic disorders (NEUROLEPTIC MALIGNANT SYNDROME; ENCEPHALITIS, etc.). (From DSM-IV, 4th ed, 1994; APA, Thesaurus of Psychological Index Terms, 1994)
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