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Computed axial brain tomograms in long-term benzodiazepine users

P Moodley1, S Golombok, P Shine

  • 1St. John's Health Care Unit, Battersea, London, UK.

Psychiatry Research
|August 1, 1993
PubMed
Summary

Long-term benzodiazepine use did not significantly alter overall brain structure. However, heavy users, especially those taking lorazepam, showed minor differences in specific brain region density compared to nonusers.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Pharmacology

Background:

  • Benzodiazepines are commonly prescribed psychoactive medications.
  • Long-term effects of benzodiazepines on brain structure require further investigation.
  • Previous studies have yielded conflicting results regarding benzodiazepine-induced brain changes.

Purpose of the Study:

  • To investigate the impact of benzodiazepine use on brain structure.
  • To compare brain structure in different groups of benzodiazepine users and nonusers.
  • To identify potential correlations between benzodiazepine dosage/duration and brain morphology.

Main Methods:

  • Computed axial brain tomograms were acquired from four subject groups: never users, short-term past users, current users, and long-term past users (with at least 6 months of withdrawal).

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  • Ventricle-to-brain ratios and X-ray tissue absorption (brain density) were calculated.
  • Statistical analyses were performed to compare brain metrics across groups.

    • Main Results:

    • No significant overall differences in ventricle-to-brain ratios or brain density were observed between the main study groups.
    • Specific brain regions exhibited slight density variations between individuals who had never used benzodiazepines and heavy users.
    • Lorazepam, a specific benzodiazepine, was associated with notable regional density differences in heavy users.

    Conclusions:

    • Current and past benzodiazepine use, even long-term, does not appear to cause widespread structural brain alterations.
    • Subtle regional brain density changes may occur in heavy benzodiazepine users, particularly with lorazepam.
    • Further research is warranted to elucidate the clinical significance of these minor regional density variations.