An Evaluation of Manic-Depressive Psychosis in the Light of Follow-Up Studies

Many cases which were originally diagnosed as manic-depressives were subsequently reclassified as schizophrenia. Review of New York State and Federal statistics for other states show: (a) Marked fluctuation in the number of manic-depressives as compared with dementia præcox and in relation to total admissions. A complete reversal of the general trend in some states. Special case studies reveal that errors in diagnosis result from the failure to apply the established criteria of symptomatology. A need for periodic reconsideration of diagnosis is indicated.