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Current perception thresholds and postoperative pain in schizophrenic patients.
A Kudoh1, H Ishihara, A Matsuki
1Department of Anesthesiology, University of Hirosaki School of Medicine, Aomori, Japan.
Regional Anesthesia and Pain Medicine
|September 29, 2000
Summary
Chronic schizophrenic patients exhibit reduced pain sensitivity, with higher current perception thresholds (CPT) and lower postoperative pain scores. This suggests altered pain processing in schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Pain Research
Background:
- Schizophrenia is associated with potential alterations in pain perception.
- Previous research on pain insensitivity in schizophrenia is limited.
- This study addresses the need for adequate evaluation of pain sensitivity in schizophrenia.
Purpose of the Study:
- To investigate current perception threshold (CPT) and postoperative pain intensity in patients with chronic schizophrenia.
- To compare pain sensitivity between long-standing, treated schizophrenic patients and control individuals.
Main Methods:
- Measured CPTs at 2,000 Hz, 250 Hz, and 5 Hz.
- Assessed postoperative pain intensity using a visual analogue scale (VAS).
- Included 50 chronic schizophrenic patients on phenothiazine derivatives and 25 control patients.
Main Results:
- Schizophrenic patients demonstrated significantly higher CPTs across all tested frequencies (2,000 Hz, 250 Hz, 5 Hz) compared to controls.
- Schizophrenic patients reported significantly lower VAS pain scores at 2 and 5 hours post-operatively.
- These findings indicate reduced pain sensitivity in the schizophrenic cohort.
Conclusions:
- Chronic schizophrenic patients exhibit an increased current perception threshold.
- These patients also report lower postoperative pain intensity compared to control groups.
- The study confirms diminished pain sensitivity in long-term, treated schizophrenia.