The traditional “subtypes” of schizophrenia—catatonic, disorganized, paranoid, residual, and undifferentiated—have been eliminated from criteria for the new DSM-5 to be published this month, a decision that appears to be supported by diminished use of the subtypes in literature on schizophrenia research. A review of literature over the last 20 years appearing in the May Schizophrenia Bulletin found that use of those subtypes has fallen markedly.
….One of the investigators in the new study said the subtypes were no longer clinically useful. “The main reason is that they have not proven useful clinically and are not a good heuristic for understanding psychosis,” Carpenter said. “It’s a mistake to think of catatonia as a subtype of schizophrenia, and the subtypes have tended to reinforce that mistake.”
by Psychiatric News Alert