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Bizarre delusions and DSM-IV schizophrenia
Makoto Nakaya1, Katsunori Kusumoto, Takayuki Okada
1Department of Psychiatry, Dokkyo University School of Medicine, Kitakobayashi, Mibu, Tochigi, Japan. m-nakaya@dokkyomed.ac.jp
Psychiatry and Clinical Neurosciences
|July 12, 2002
Summary
This study found that while non-Schneiderian bizarre delusions (non-SBD) in schizophrenia patients correlate with broader psychopathology, Schneiderian bizarre delusions (SBD) do not form a distinct clinical subgroup. Neither type of bizarre delusion differentiated patients demographically.
Area of Science:
- Psychiatry
- Clinical Psychology
- Neuroscience
Background:
- Bizarre delusions are a key diagnostic feature of schizophrenia.
- Schneiderian first-rank symptoms (SBD) represent a specific category of bizarre delusions.
- Understanding the clinical correlates of different types of bizarre delusions is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate demographic and clinical differences between schizophrenia patients with and without DSM-IV bizarre delusions.
- To compare patients with Schneiderian bizarre delusions (SBD) and non-Schneiderian bizarre delusions (non-SBD).
- To assess the association of SBD and non-SBD with psychopathology domains measured by the Positive and Negative Syndrome Scale (PANSS).
Main Methods:
- One hundred and twenty-nine schizophrenia in-patients were systematically assessed for SBD and non-SBD.
- Psychopathology was evaluated across five PANSS domains: delusions/hallucinations, thought disorder/disorganization, excitement, negative symptoms, and depressive symptoms.
- Extrapyramidal side-effects were also assessed; inter-rater reliabilities for SBD and non-SBD were high.
Main Results:
- Neither SBD nor non-SBD were associated with demographic or non-PANSS clinical characteristics.
- Non-SBD were significantly associated with more severe psychopathology across all five PANSS domains.
- SBD were significantly associated with more severe psychopathology in delusions/hallucinations, thought disorder/disorganization, and depressive symptoms domains only.
Conclusions:
- Schizophrenia patients with non-SBD exhibit broader psychopathology compared to those without.
- Patients with SBD show a more limited association with specific psychopathological domains.
- Despite symptom severity differences, patients with DSM-IV bizarre delusions, whether SBD or non-SBD, do not represent a clinically distinct subgroup.