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Dose-dependent effects of intravenous alcohol administration on cerebral blood flow in young adults

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Abstract

Rationale

Functional magnetic resonance imaging (fMRI) studies involving alcohol challenge are important for identifying neural correlates of alcohol’s psychopharmacological effects. However, evaluating acute alcohol effects on blood oxygen level-dependent (BOLD) signal change is complicated by alcohol-related increases in cerebral blood flow (CBF).

Objectives

The present study aimed to further characterize acute alcohol effects on CBF using intravenous alcohol administration to maximize control over brain alcohol exposure.

Methods

Twenty heavy-drinking young adults (M = 19.95 years old, SD = 0.76) completed alcohol and placebo imaging sessions in a within-subject, counter-balanced, placebo-controlled design. Arterial spin labeling (ASL) provided estimates of perfusion change at two target blood alcohol concentrations (40 and 80 mg%) relative to baseline and relative to a saline control infusion.

Results

Voxel-wise analyses showed widespread and dose-dependent effects of alcohol on CBF increase. Region-of-interest analyses confirmed these findings, also indicating regional variation in the magnitude of perfusion change. Additional findings indicated that lower self-reported sensitivity to alcohol corresponded with reduced perfusion change during alcohol administration.

Conclusions

This study provides further evidence for widespread effects of acute alcohol on cerebral perfusion, also demonstrating regional, dose-dependent, and inter-individual variation. Further research is needed to evaluate implications of these effects for the design and interpretation of pharmacological fMRI studies involving alcohol challenge.

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Notes

  1. Preliminary analyses also evaluated cigarette smoking as a potential influence on cerebral blood flow (CBF). Baseline (T1) measures of global cerebral blood flow (derived from the placebo session) did not differ between smokers vs. non-smokers (p = 0.91) and were not associated with hours since last cigarette among smokers (p = 0.93). These smoking variables also showed no significant relation to baseline CBF across the regions of interest depicted in Table S2 (see Online Resource), ps > 0.10. Among smokers, number of hours since last cigarette did not differ significantly between alcohol and placebo scans (p = 0.18).

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Acknowledgments

The authors thank Sean O’Connor and Victor Vitvitskiy at the Indiana Alcohol Research Center (NIH P60 AA007611) for software support and Nancy Lobaugh, Sofia Chavez, Anusha Ravichandran, and Mahesh Menon for their assistance with MRI data collection.

Conflict of Interest

This study was supported by Canadian Institutes of Health Research (CIHR) grant 260418 (CH). The authors also acknowledge the support from CIHR grants 288905/307742; ABMRF/The Foundation for Alcohol Research; and the Canada Foundation for Innovation (CH), the NIAAA Division of Intramural Clinical and Biological Research (VAR), and NIH P60AA 007611. The authors declare no conflicts of interest.

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Correspondence to Christian S. Hendershot.

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Strang, N.M., Claus, E.D., Ramchandani, V.A. et al. Dose-dependent effects of intravenous alcohol administration on cerebral blood flow in young adults. Psychopharmacology 232, 733–744 (2015). https://doi.org/10.1007/s00213-014-3706-z

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  • DOI: https://doi.org/10.1007/s00213-014-3706-z

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