Regional brain metabolic response to lorazepam in alcoholics during early and late alcohol detoxification

Nora D. Volkow, Gene Jack Wang, John E. Overall, Robert Hitzemann, Joanna S. Fowler, Naomi Pappas, Ede Frecska, Kathleen Piscani

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

Changes in GABA function have been postulated to be involved in alcohol tolerance, withdrawal and addiction. In this study we measured regional brain metabolic responses to lorazepam, to indirectly assess GABA function (benzodiazepines facilitate GABAergic neurotransmission), in alcoholics during early and late withdrawal. Brain metabolism was measured using PET and 2-deoxy-2[18F]fluoro-D-glucose after placebo (baseline) and after lorazepam (30 μg/kg intravenously) in 10 alcoholics and 16 controls. In the alcoholics evaluations were performed 2 to 3 weeks after detoxification and were repeated 6 to 8 weeks later. Controls were also evaluated twice at a 6 to 8 weeks interval. While during the initial evaluation metabolism was significantly lower for most brain regions in the alcoholics than in controls in the repeated evaluation the only significant differences were in cingulate and orbitofrontal cortex. Lorazepam-induced decrements in metabolism did not change with protracted alcohol withdrawal and the magnitude of these changes were similar in controls and alcoholics except for a trend towards a blunted response to lorazepam in orbitofrontal cortex in alcoholics during the second evaluation. Abnormalities in orbitofrontal cortex and cingulate gyrus in alcoholics are unlikely to be due to withdrawal since they persist 8 to 11 weeks after detoxification. The fact that there was only a trend of significance for an abnormal response to lorazepam in orbitofrontal cortex indicates that mechanisms other than GABA are involved in the brain metabolic abnormalities observed in alcoholic subjects.

Original languageEnglish (US)
Pages (from-to)1278-1284
Number of pages7
JournalAlcoholism: Clinical and Experimental Research
Volume21
Issue number7
DOIs
StatePublished - Jan 1 1997

Keywords

  • Addiction
  • FDG
  • GABA
  • Orbitofrontal cortex
  • PET

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Toxicology
  • Psychiatry and Mental health

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