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Brain gray and white matter volume loss accelerates with aging in chronic alcoholics: a quantitative MRI study
A Pfefferbaum1, K O Lim, R B Zipursky
1Psychiatry Service, Department of Veterans Affairs Medical Center, Palo Alto, California 94304.
Abstract:
Magnetic resonance imaging (MRI) was used to study in vivo the brains of 49 patients with chronic alcoholism, 3 to 4 weeks post-withdrawal, and 43 normal healthy controls, all right-handed male veterans between the ages of 23 and 70 years. MRI scans were analyzed using a semi-automated procedure, which allowed the subcortical regions to be segmented into cerebrospinal fluid (CSF) and brain tissue and the cortical regions to be segmented into CSF, gray matter, and white matter. An age regression model was used to examine the effects of alcohol on brain structure, over and above that expected from the normal aging process. The alcoholics exhibited decreased tissue and increased CSF after correcting for aging. In the cortex, there was significant loss of both gray matter and white matter volume. In this sample of alcoholics, no particular cortical region was preferentially affected or spared. Furthermore, brain tissue volume loss increased with advanced age in the alcoholics. In this group of alcoholics there was no relationship between length of illness and age, i.e., the younger alcoholics had as heavy alcohol use histories as did the older alcoholics. Thus, the increased brain tissue loss with advanced age is interpreted as evidence for age-related increase in brain vulnerability to chronic alcohol abuse.
Insights
Chronic alcoholism leads to significant brain tissue loss, particularly gray and white matter, which worsens with age. This suggests increased brain vulnerability to alcohol abuse in older individuals.
Area of Science:
- Neuroimaging
- Neurology
- Addiction Research
Background:
- Chronic alcoholism is associated with structural brain changes.
- Understanding the specific impact of alcohol on brain structure, independent of normal aging, is crucial.
Purpose of the Study:
- To investigate the effects of chronic alcoholism on brain structure using Magnetic Resonance Imaging (MRI).
- To determine if alcohol-induced brain changes differ from age-related changes.
- To assess the relationship between age, alcohol abuse, and brain tissue loss.
Main Methods:
- Utilized MRI to scan the brains of 49 male veterans with chronic alcoholism and 43 healthy controls.
- Employed semi-automated segmentation to differentiate brain tissue, gray matter, white matter, and cerebrospinal fluid (CSF).
- Applied an age regression model to analyze alcohol's impact on brain structure beyond normal aging.
Main Results:
- Alcoholics showed reduced brain tissue and increased CSF volume compared to controls, after accounting for age.
- Significant gray matter and white matter volume loss was observed in the cortex of alcoholics.
- Brain tissue loss in alcoholics was found to increase with advanced age, indicating heightened vulnerability.
Conclusions:
- Chronic alcohol abuse causes significant structural brain damage, including cortical gray and white matter loss.
- The brain's vulnerability to alcohol-induced damage increases with age.
- Age-related increases in brain tissue loss suggest a synergistic effect between aging and chronic alcohol abuse.