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Titolo:
ENHANCED SENSITIVITY TO BENZODIAZEPINES IN ACTIVE COCAINE-ABUSING SUBJECTS - A PET STUDY
Autore:
VOLKOW ND; WANG GJ; FOWLER JS; HITZEMANN R; GATLEY SJ; DEWEY SS; PAPPAS N;
Indirizzi:
BROOKHAVEN NATL LAB,DEPT MED,BLDG 490 UPTON NY 11973 BROOKHAVEN NATL LAB,DEPT CHEM UPTON NY 11973 SUNY STONY BROOK,DEPT PSYCHIAT STONY BROOK NY 11794
Titolo Testata:
The American journal of psychiatry
fascicolo: 2, volume: 155, anno: 1998,
pagine: 200 - 206
SICI:
0002-953X(1998)155:2<200:ESTBIA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT-BRAIN; PERSISTING CHANGES; DISCRETE REGIONS; RECEPTORS; METABOLISM; LORAZEPAM; ETHANOL; HUMANS; SYSTEM; SENSITIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
N.D. Volkow et al., "ENHANCED SENSITIVITY TO BENZODIAZEPINES IN ACTIVE COCAINE-ABUSING SUBJECTS - A PET STUDY", The American journal of psychiatry, 155(2), 1998, pp. 200-206

Abstract

Objective: Because cocaine enhances dopamine brain activity and dopamine signals are transferred through gamma-aminobutyric acid pathways, the authors hypothesized GABA-ergic disruption in cocaine-abusing subjects. This study tests this hypothesis. Method: GABA brain function was assessed indirectly by measuring the brain metabolic responses to lorazepam, a drug that facilitates GABA neurotransmission. Thirteen current cocaine-abusing subjects and 14 comparison subjects were scanned twice with positron emission tomography and [F-18]fluorodeoxyglucose; the first scan was obtained after placebo administration and the secondafter lorazepam administration (30 mu g/kg). Results: Despite significantly higher plasma lorazepam concentrations in comparison subjects than in cocaine-abusing subjects, lorazepam-induced decrements in wholebrain metabolism were significantly greater in cocaine-abusing (mean = 21%, SD = 13%) than in comparison (mean = 13%, SD = 7%) subjects. These differences were largest in striatum, thalamus, and parietal cortex. Lorazepam-induced sleepiness in cocaine-abusing subjects was intense and was significantly greater than in comparison subjects, and it was correlated with lorazepam-induced changes in thalamic metabolism. Whereas regional metabolic measures during placebo administration were significantly higher in cocaine-abusing subjects than in comparison subjects, the measures during lorazepam administration were equivalent for both groups. Conclusions: The enhanced sensitivity to lorazepam in cocaine-abusing subjects suggests disruption of GABA pathways that may reflect, in part, cocaine withdrawal. The intense sleepiness induced by lorazepam in some of the abusers, despite their significantly lower plasma concentrations, should alert clinicians of the potential toxicity from accentuated responses to sedative hypnotics in active cocaine-abusing subjects.

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Documento generato il 04/04/20 alle ore 02:27:13