Abstract

BACKGROUND:

Paraphrenia is a disorder similar to paranoid schizophrenia but with better-preserved affect and rapport and much less personality deterioration. It is now diagnosed relatively infrequently and is not listed in the current Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) or International Classification of Diseases (ICD-10). However, it appears that some psychiatrists recognize the illness but label it "atypical psychosis," "schizoaffective disorder," or "delusional disorder" for lack of a better diagnostic category. Virtually no systematic research on paraphrenia has been conducted in the past 60 years.

METHOD:

The authors distinguish paraphrenia from "late paraphrenia," a diagnosis used mainly in the United Kingdom, and provide a neo-Kraepelinian description of paraphrenia that would be compatible with the formats of DSM-IV and ICD-10. Using a questionnaire adapted from this description, intake cases in 2 Canadian psychiatric centres (Ottawa [Ontario] and Dartmouth [Nova Scotia]) were surveyed. Cases of paraphrenia were distinguished from those of schizophrenia and delusional disorder and were examined at the time of intake and immediately prior to discharge.

RESULTS:

For logistical reasons, collecting a totally consecutive series was not possible. However, during an 18-month period, investigators in both centres identified 33 cases closely fitting paraphrenia. The outstanding features of these cases are enumerated, and an outline description of paraphrenia is derived.

CONCLUSION:

It is possible to define and recognize paraphrenia; it is a viable diagnostic entity. Further research would benefit paraphrenia and schizophrenia patients. Cases in this study have been coded to permit follow-up investigations.