Flunitrazepam-induced changes in neurophysiological, behavioural, and subjective measures used to assess sedation

Date
2003-05-01Author
Lucchesi, Lígia M. [UNIFESP]
Pompeia, Sabine [UNIFESP]
Manzano, Gilberto M. [UNIFESP]
Kohn, A. F.
Galduroz, José CF [UNIFESP]
Bueno, Orlando FA [UNIFESP]
Tufik, Sergio [UNIFESP]
Type
ResenhaISSN
0278-5846Is part of
Progress in Neuro-psychopharmacology & Biological PsychiatryDOI
10.1016/S0278-5846(03)00044-7Metadata
Show full item recordAbstract
Introduction: Certain features of event-related potentials (ERPs), electroencephalographic (EEG), and behavioural measures vary with differing states of alertness and/or sedation. Purpose: This study was conducted to investigate changes in several measures usually viewed as reflecting states of sedation/sleepiness associated with the use of a range of doses of the hypnotic benzodiazepine (BZD) flunitrazepam (FNZ). Methods: This was a double blind, independent group design study of the effects of acute oral doses of FNZ in young healthy volunteers. Forty-eight subjects were randomly allocated to one of four groups-FNZ (0.6, 0.8, and 1.0 mg) and placebo (PLAC)-and tested prior to treatment and then in a posttreatment session close to the theoretical peak plasma concentration. ERP latencies and amplitudes were measured at midfrontal (Fz), midcentral (Cz), and midparietal (Pz) using a standard auditory oddball paradigm. EEG changes were assessed at Pz. Behavioural measures included the digit-symbol substitution test (DSST), a cancellation task (CT), and subjective ratings of alertness and attentiveness by the subjects (SUB) and the experimenter (EXP). Results: FNZ led to psychomotor impairments and decreased alertness and attention; these effects were consistent with previous findings. A progressive, dose-related increase in P3 latency occurred in Fz, Cz, and Pz, and there was an increase in N1 (Fz, Cz) and N2 (Fz). N2-P3 amplitude decreased in Fz. EEG power bands beta 1 increased for the two highest doses, but no significant differences were noted in theta, delta, and alpha bands. P3 latencies, experimenter-rated levels of alertness, and DSST scores differentiated all three doses of FNZ from PLAC. Conclusion: the most sensitive measures used were P3 latencies of the ERPs (which varied with FNZ dose), DSST, and the experimenter-rated levels of alertness. However, we found no evidence for the assumption that one single phenomenon was reflected in all measures and different mechanisms were probably involved. Further experiments will be needed for more in-depth probing of the finer mechanisms underlying sedation/sleepiness and how they affect behavioural and eletrophysiological measures of the central nervous system (CNS) function. (C) 2003 Elsevier Science Inc. All rights reserved.
Citation
Progress in Neuro-psychopharmacology & Biological Psychiatry. Oxford: Pergamon-Elsevier B.V., v. 27, n. 3, p. 525-533, 2003.Collections
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