Abstract
1. 1. Lymphocyte subsets and neutrophil function were studied in chronic psychiatric patients on long-term multiple drug therapy, and the correlation with disease and drug treatments was also investigated. 2. 2. Patients showed decreased CD4 + percentage, CD4 + CD8 + ratio, B lymphocyte percentage, increased absolute and percentage NK, and impaired neutrophil chemotaxis, phagocytosis, and oxidative metabolism. Correlations were found between: patient status and lower CD4 + percentage, CD4 + CD8 + ratio, neutrophil chemotaxis, phagocytosis, and oxidative metabolism; schizophrenia and higher absolute and percentage NK, and neutrophil random migration; benzodiazepines and higher CD8 + absolute number and lower NBT reduction frequency; carbamazepine and higher NK percentage, neutrophil chemotaxis, phagocytosis, stimulated O 2-production, and lower microbicidal activity. 3. 3. The present study provides direct evidence for the existence of immunologic abnormalities in a population of chronic psychiatric patients on long-term drug therapy. Although a possible role by other factors could not be excluded, such abnormalities are strongly associated with chronic administration of benzodiazepines and carbamazepine. Further investigations are warranted to confirm these findings and disclose the possible mechanism(s) involved.
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