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Changes in EEG indices and serotonin concentrations in depression and anxiety disorders

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Electroencephalogram (EEG) is an important tool to study brain function. EEG can evaluate the current functional state of the brain with high temporal resolution and identify metabolic and ion disorders that cannot be detected by magnetic resonance imaging.

Objective: to analyze the relationship between some neurophysiological and biochemical parameters with a Neuro-KM hardware-software complex for the topographic mapping of brain electrical activity.

Patients and methods. 75 patients with depression, 101 with anxiety disorders (AD), and 86 control individuals were examined. EEG spectrum and coherence changes were estimated in the depression and AD groups versus the control group. Correlation analysis of EEG indices and blood serotonin concentrations was carried out.

Results and discussion. The patients with depression and those with AD as compared to the controls were observed to have similar EEG spectral changes in the beta band. Coherence analysis in the beta-band showed that both disease groups versus the control group had oppositely directed changes: a reduction in intra- and interhemispheric coherence for depression and its increase for AD (p < 0.001). That in the theta and alpha bands revealed that both disease groups had unidirectional interhemispheric coherence changes: a decrease in integration in the alpha band and its increase in the theta and delta bands in the depression and AD groups (p < 0.05) and multidirectional changes in intrahemispheric coherence: its reduction in the depression group and an increase in the AD group (p < 0.05). Correlation analysis of EEG parameters and platelet serotonin concentrations showed opposite correlations of serotonin concentrations and EEG percentage power in the theta and beta bands. When there were higher serotonin concentrations in the patients with depression, EEG demonstrated a preponderance of a synchronization pattern; when these were in the patients with AD, there was a predominance of a desynchronization pattern.

Conclusion. The specific features of EEG in the depression and AD groups may indicate serotonin metabolic disorders and the efficiency of therapy with selective serotonin reuptake inhibitors.

About the Authors

I. V. Kichuk
Department of Fundamental and Clinical Neurology and Neurosurgery, N.I. Pirogov Russian National Research Medical University, Ministry of Health of Russia, Moscow, Russia; 1, Ostrovityanov St., Moscow 117997 Research Institute for Cerebrovascular Diseases and Stroke, N.I. Pirogov Russian National Research Medical University, Ministry of Health of Russia, Moscow, Russia 1, Ostrovityanov St., Moscow 117997
Russian Federation

E. A. Petrova
Department of Fundamental and Clinical Neurology and Neurosurgery, N.I. Pirogov Russian National Research Medical University, Ministry of Health of Russia, Moscow, Russia; 1, Ostrovityanov St., Moscow 117997 Research Institute for Cerebrovascular Diseases and Stroke, N.I. Pirogov Russian National Research Medical University, Ministry of Health of Russia, Moscow, Russia 1, Ostrovityanov St., Moscow 117997
Russian Federation

A. A. Mitrofanov
Neurometrix Research and Production Firm, Mental Health Research Center, Moscow, Russia 34, Kashirskoe Shosse, Moscow 115522
Russian Federation

N. V. Solovyeva
Research Center for Personalized Psychiatry, Moscow, Russia 7/10, Bolshaya Polyanka St, Build. 3, Moscow 119180
Russian Federation

V. B. Vilyanov
Research and Diagnostic Center for Clinical Psychiatry, Moscow, Russia 48, Altufyevskoe Shosse, Build. 1, Moscow 127566
Russian Federation


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For citation:

Kichuk I.V., Petrova E.A., Mitrofanov A.A., Solovyeva N.V., Vilyanov V.B. Changes in EEG indices and serotonin concentrations in depression and anxiety disorders. Neurology, Neuropsychiatry, Psychosomatics. 2016;8(3):34-38. (In Russ.)

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