Objective: The aim of our study was to assess the possible relationship between event-related potentials (ERP) and serotonergic or noradrenergic activity in depression. Therefore, we were interested in the impact of different monoamine reuptake inhibitors on ERP.
Methods: Thirty-six inpatients with major depression were treated with either reboxetine (n = 17) or citalopram (n = 19) in a prospective randomized study. Before and after four weeks of treatment, visually-evoked ERP were investigated. Twenty-two patients completed the study. Monoaminergic function was determined by oral reboxetine and citalopram challenge tests.
Results: P3 latency significantly decreased after a four-week treatment with either drug. There was no significant difference in the decrease of P3 latency between both drugs. We detected a significant inverse correlation between serotonergic hypofunction before treatment and the P3 latency (r = -0.739, p = 0.001).
Conclusions: These results show that, in depressed patients, the P3 latency is decreased by antidepressive treatment. Furthermore, the results suggest that P3 latency might depend on the serotonergic rather than the noradrenergic system.
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Guenter Hetzel, MD
Department of Psychiatry
University of Muenster
Albert-Schweitzer-Str. 11
48129 Muenster
Germany
Phone: +49 251/8356678
Fax: +49 251/8356612
Email: hetzelg@uni-muenster.de
