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Related Experiment Videos

Prodromal symptoms in schizophrenia

A K Malla1, R M Norman

  • 1Department of Psychiatry, University of Western Ontario.

The British Journal of Psychiatry : the Journal of Mental Science
|April 1, 1994
PubMed
Summary

Prodromal symptoms in schizophrenia show limited predictive power for subsequent psychosis. This study found weak correlations between early non-psychotic signs and later psychotic episodes in outpatients.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Neuroscience

Background:

  • Schizophrenia diagnosis relies on identifying psychotic symptoms.
  • Prodromal symptoms are early indicators, but their predictive validity for psychosis onset is debated.

Purpose of the Study:

  • To prospectively examine the relationship between non-psychotic prodromal symptoms and subsequent psychotic symptoms in schizophrenia outpatients.
  • To assess the predictive power of prodromal symptoms for psychosis development.

Main Methods:

  • Prospective longitudinal study of 55 schizophrenic outpatients (DSM-III-R).
  • Monthly assessment of non-psychotic prodromal and psychotic symptoms using standardized instruments over 12-29 months.
  • Longitudinal correlational analysis with a 1-month lag, controlling for concurrent psychotic symptoms.

Main Results:

  • Less than one-fifth of subjects showed significant positive correlations between prodromal and subsequent psychotic symptoms.
  • Controlling for concurrent psychotic symptoms reduced the significance of these relationships further.
  • Prodromal symptoms demonstrated adequate specificity but low sensitivity for predicting high levels of subsequent psychosis.

Conclusions:

  • Non-psychotic prodromal symptoms have limited ability to predict the onset or severity of psychotic symptoms in schizophrenia outpatients.
  • Clinical utility of prodromal symptom assessment for predicting psychosis requires further investigation.
  • No demographic or treatment differences were found between patients who did or did not exhibit a relationship between prodromal and psychotic symptoms.

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