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Chronic Post-Ischemia Pain Model for Complex Regional Pain Syndrome Type-I in Rats
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Experimental pain hypersensitivity in schizophrenic patients.

Murielle Girard1, Brigitte Plansont, Henri Bonnabau

  • 1Département Recherche et Développement, Centre Hospitalier Esquirol, rue du Docteur Marcland, Limoges cedex, France. murielle.girard@ch-esquirol-limoges.fr

The Clinical Journal of Pain
|May 20, 2011
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Summary

Schizophrenic patients exhibit hypersensitivity to pain, requiring less pressure and shorter ischemia to feel moderate pain. This suggests their reported hypoalgesia may stem from underreporting rather than diminished pain sensation.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Pain Research

Background:

  • Assessing pain in schizophrenic patients is crucial for their primary care.
  • Previous assumptions suggested schizophrenic patients might be hypoalgesic.
  • Understanding pain sensitivity is key to accurate medical assessments.

Purpose of the Study:

  • To investigate the pain sensitivity of individuals with schizophrenia.
  • To compare pain perception in schizophrenic patients versus controls under controlled conditions.
  • To explore the relationship between pain responses and clinical characteristics in schizophrenia.

Main Methods:

  • Two experimental pain models were utilized: pressure and ischemia.
  • Thirty-five schizophrenic patients and 35 controls participated.
  • Stimulus intensity for moderate pain and pain intensity at fixed pressure were recorded.

Main Results:

  • Schizophrenic patients reported moderate pain at lower pressure and shorter ischemia durations compared to controls.
  • A fixed pressure stimulus induced greater pain intensity in schizophrenic patients.
  • Pain responses were not correlated with clinical data, except for hallucination production.

Conclusions:

  • Schizophrenic patients demonstrated hypersensitivity to induced pain under experimental conditions.
  • Reported hypoalgesia in schizophrenia may be due to reduced pain reporting, not reduced sensation.
  • Clinical practice should consider this hypersensitivity when assessing pain in schizophrenic individuals.