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Clozapine, negative symptoms, and extrapyramidal side effects
J M Kane1, A Z Safferman, S Pollack
1Hillside Hospital, Division of Long Island Jewish Medical Center, Glen Oaks, N.Y. 11004.
The Journal of Clinical Psychiatry
|September 1, 1994
Summary
Persistent negative symptoms in schizophrenia hinder rehabilitation. Clozapine treatment showed correlations between akinesia and anergia, suggesting drug-induced parkinsonism may complicate negative symptom assessment.
Area of Science:
- Psychiatry
- Neuroscience
- Pharmacology
Background:
- Persistent negative symptoms significantly impede psychosocial and vocational rehabilitation in schizophrenia patients.
- Current treatment trials and drug development increasingly target negative symptoms.
- Neuroleptic-induced parkinsonism shares phenomenological overlap with negative symptoms, complicating assessment.
Purpose of the Study:
- To investigate the relationship between negative symptoms and neuroleptic-induced parkinsonism in clozapine-treated schizophrenia patients.
- To assess the impact of drug-induced parkinsonism on the evaluation of negative symptoms.
Main Methods:
- Analysis of data from a cohort of 56 patients treated with clozapine.
- Assessment of negative symptoms and parkinsonian side effects, including measures of akinesia and anergia.
- Inclusion of patients with an average drug washout period exceeding two weeks.
Main Results:
- Significant correlations were observed between measures of akinesia and anergia in clozapine-treated patients.
- The persistence of drug-induced parkinsonism was noted even after a substantial drug washout period.
Conclusions:
- Drug-induced parkinsonism, specifically akinesia, is significantly correlated with negative symptoms like anergia in schizophrenia.
- The persistent nature of drug-induced parkinsonism can confound the accurate assessment of therapeutic effects on negative symptoms in clinical trials and treatment monitoring.