title: Influence of antipsychotic medication on pain perception in schizophrenia.
abstract: A number of clinical observations indicate that pain processing might be disturbed in psychotic disorders such as schizophrenia. Only a few studies have investigated pain perception in schizophrenia. The main objective of this study was the investigation of thresholds of warmth perception (WP), thermal pain onset (TPO) and thermal pain tolerance (TPT) in acute schizophrenic patients and the influence of antipsychotic medication on the patients' responses. We investigated 23 schizophrenic subjects who had been not received antipsychotic treatment for 8 weeks, and we then reassessed them 3 days later after the introduction of neuroleptics. Acute symptoms of schizophrenia were measured using the Scales for the Assessment of Positive and Negative Symptoms. Thresholds were determined by a contact thermode on both volar wrists. Schizophrenic patients showed significantly increased thresholds of WP and TPO relative to healthy controls. Antipsychotics did not alter pain thresholds. We found no correlation between pain perception and psychometric scales. Our findings demonstrate altered warmth and heat pain perception in acute schizophrenia. We believe that our findings can be attributed to information-processing abnormalities of the disorder and that they are not specific to pain processing, per se, since both WP and TPO were significantly different. Future studies should evaluate attentional deficits in schizophrenia in relation to pain perception.
authors.affiliation: Department of Psychiatry, Friedrich-Schiller-University of Jena, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Jochum
authors.forename: Andrea
authors.initials: A
authors.lastname: Letzsch
authors.forename: Wolf
authors.initials: W
authors.lastname: Greiner
authors.forename: Gerd
authors.initials: G
authors.lastname: Wagner
authors.forename: Heinrich
authors.initials: H
authors.lastname: Sauer
authors.forename: Karl-Jürgen
authors.initials: KJ
authors.lastname: Bär
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D017288:Pain Threshold / Q000187:drug effects*; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data; D011594:Psychometrics / Q000706:statistics & numerical data; D012563:Schizophrenia, Paranoid / Q000175:diagnosis / Q000188:drug therapy* / Q000523:psychology; D013223:Statistics as Topic; D013697:Thermosensing / Q000187:drug effects
chemical_list: D014150:Antipsychotic Agents