why subcategories of schizophrenia (paranoid, disorganized, undifferentiated etc) have been removed as diagnostic entities in DSM-5 ?
Dear Anil Kumar Mysore Nagaraj
Schizophrenia subtypes are deleted based on the following causes:
The DSM-IV subtypes of schizophrenia (i.e., paranoid, disorganized, catatonic, undifferentiated, and residual types) are eliminated due to their limited diagnostic stability, low reliability, and poor validity. These subtypes also have not been shown to exhibit distinctive patterns of treatment response or longitudinal course. Instead, a dimensional approach to rating severity for the core symptoms of schizophrenia is included in Section III to capture the important heterogeneity in symptom type and severity expressed across individuals with psychotic disorders.
The biggest changes were for catatonia and the reason was to alert clinicians for other than schizophrenia mental disorders that may cause the clinical picture of catatonia.
The changes regarding schizophrenia include the following :1-All sub types of schizophrenia were deleted (paranoid, disorganized, catatonic, undifferentiated, and residual). 2-Catatonia in all contexts requires 3 of a total of 12 symptoms. Catatonia may be a specifier for depressive, bipolar, and psychotic disorders; part of another medical condition; or of another specified diagnosis
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