Cannabis and Alcohol History Did Not Make Brain Shrinkage Worse in Schizophrenia Patients
Schizophrenia patients showed reduced gray matter compared to healthy controls, but having a history of cannabis or alcohol use did not make those brain differences any worse.
Quick Facts
What This Study Found
Using voxel-based morphometry, researchers found that schizophrenia patients had reduced gray matter in several brain regions regardless of substance use history. No additional gray matter differences were found between patients with and without cannabis/alcohol use histories.
Key Numbers
158 schizophrenia patients total (92 with and 66 without substance use history) compared to 88 healthy controls. Gray matter reductions were found in bilateral precentral gyrus, right medial frontal cortex, right thalamus, bilateral amygdala, and bilateral cerebellum.
How They Did This
VBM brain imaging compared 92 schizophrenia patients with substance use histories, 66 without substance use histories, and 88 healthy controls.
Why This Research Matters
A major concern in schizophrenia research is whether substance use confounds brain structure findings. This study suggests that cannabis and alcohol use do not significantly worsen the gray matter reductions already associated with schizophrenia.
The Bigger Picture
This finding helps clarify the relationship between substance use and brain changes in schizophrenia. While substances may affect the brain in other ways, they do not appear to compound the specific gray matter deficits characteristic of the disorder.
What This Study Doesn't Tell Us
Cross-sectional design limits causal conclusions. Substance use histories were clinically assessed rather than biologically verified. The study did not examine other brain measures like white matter or functional connectivity.
Questions This Raises
- ?Could substance use affect brain function without changing gray matter volume?
- ?Do different types or amounts of substance use produce different effects?
- ?What about other substances beyond cannabis and alcohol?
Trust & Context
- Key Stat:
- 92 schizophrenia patients with substance use and 66 without showed identical patterns of gray matter reduction.
- Evidence Grade:
- Moderate - adequate sample size and well-established methodology, but cross-sectional design.
- Study Age:
- Published in 2018.
- Original Title:
- Impact of substance use disorder on gray matter volume in schizophrenia.
- Published In:
- Psychiatry research. Neuroimaging, 280, 9-14 (2018)
- Authors:
- Quinn, Margaret, McHugo, Maureen, Armstrong, Kristan, Woodward, Neil, Blackford, Jennifer, Heckers, Stephan
- Database ID:
- RTHC-01801
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Does cannabis make brain damage worse in schizophrenia?
This imaging study found no additional gray matter loss in schizophrenia patients who used cannabis or alcohol compared to those who did not. The brain changes appeared to be driven by the disorder itself.
Can substance use confound brain studies in schizophrenia?
This study suggests that cannabis and alcohol use histories do not significantly alter the gray matter findings in schizophrenia research, which is reassuring for the field.
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Cite This Study
https://rethinkthc.com/research/RTHC-01801APA
Quinn, Margaret; McHugo, Maureen; Armstrong, Kristan; Woodward, Neil; Blackford, Jennifer; Heckers, Stephan. (2018). Impact of substance use disorder on gray matter volume in schizophrenia.. Psychiatry research. Neuroimaging, 280, 9-14. https://doi.org/10.1016/j.pscychresns.2018.08.002
MLA
Quinn, Margaret, et al. "Impact of substance use disorder on gray matter volume in schizophrenia.." Psychiatry research. Neuroimaging, 2018. https://doi.org/10.1016/j.pscychresns.2018.08.002
RethinkTHC
RethinkTHC Research Database. "Impact of substance use disorder on gray matter volume in sc..." RTHC-01801. Retrieved from https://rethinkthc.com/research/quinn-2018-impact-of-substance-use
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.