Author: von Rotz R1, Kometer M2, Dornbierer D1, Gertsch J3, Salomé Gachet M3, Vollenweider FX2, Seifritz E1, Bosch OG4, Quednow BB5
Affiliation: <sup>1</sup>Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Lenggstrasse 31, CH-8032, Zurich, Switzerland.
<sup>2</sup>Neuropsychopharmacology and Brain Imaging Research Unit, Department of Psychiatry, Psychotherapy and Psychosomatics, University Hospital of Psychiatry Zurich, Lenggstrasse 31, 8032, Zurich, Switzerland.
<sup>3</sup>Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstrasse 28, 3012, Bern, Switzerland.
<sup>4</sup>Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Lenggstrasse 31, CH-8032, Zurich, Switzerland. oliver.bosch@bli.uzh.ch.
<sup>5</sup>Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Lenggstrasse 31, CH-8032, Zurich, Switzerland. quednow@bli.uzh.ch.
Conference/Journal: Psychopharmacology (Berl).
Date published: 2017 Apr 20
Other:
Special Notes: doi: 10.1007/s00213-017-4603-z. [Epub ahead of print] , Word Count: 271
RATIONALE: Gamma-hydroxybutyrate (GHB) is a putative neurotransmitter, a drug of abuse, an anesthetic agent, and a treatment for neuropsychiatric disorders. In previous electroencephalography (EEG) studies, GHB was shown to induce an electrophysiological pattern of "paradoxical EEG-behavioral dissociation" characterized by increased delta and theta oscillations usually associated with sleep during awake states. However, no detailed source localization of these alterations and no connectivity analyses have been performed yet.
OBJECTIVES AND METHODS: We tested the effects of GHB (20 and 35 mg/kg, p.o.) on current source density (CSD), lagged phase synchronization (LPS), and global omega complexity (GOC) of neuronal oscillations in a randomized, double-blind, placebo-controlled, balanced cross-over study in 19 healthy, male participants using exact low-resolution electromagnetic tomography (eLORETA) of resting-state high-density EEG recordings.
RESULTS: Compared to placebo, GHB increased CSD of theta oscillations (5-7 Hz) in the posterior cingulate cortex (PCC) and alpha1 (8-10 Hz) oscillations in the anterior cingulate cortex. Higher blood plasma values were associated with higher LPS values of delta (2-4 Hz) oscillations between the PCC and the right inferior parietal lobulus. Additionally, GHB decreased GOC of alpha1 oscillations.
CONCLUSION: These findings indicate that alterations in neuronal oscillations in the PCC mediate the psychotropic effects of GHB. Theta oscillations emerging from the PCC in combination with stability of functional connectivity within the default mode network might explain the GHB-related "paradoxical EEG-behavioral dissociation." Our findings related to GOC suggest a reduced number of relatively independent neuronal processes, an effect that has also been demonstrated for other anesthetic agents.
KEYWORDS: EEG-behavioral dissociation; Gamma hydroxybutyric acid; Global omega complexity; Lagged phase synchronization; Sedation; Sodium oxybate; Source localization
PMID: 28429067 DOI: 10.1007/s00213-017-4603-z