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A study that assessed the brains of 99 World Trade Center (WTC) responders by using diffusion tractography, a 3D imaging technique, showed that WTC responders with cognitive impairment, a possible sign of dementia, and post-traumatic stress disorder (PTSD), have a different presentation of the white matter in their brains compared to responders with cognitive impairment without post-traumatic stress disorder. Led by researchers at Stony Brook University affiliated with the Stony Brook WTC Health and Wellness Program, the study suggests a specific form of dementia could be affecting WTC responders who also have post-traumatic stress disorder. The findings are published early online in the Journal of Alzheimer’s Disease.
According to the authors, this is the first study to examine white matter alterations using connectometry in a sample of WTC responders in mid-life (average age: 56) with and without concurrent post-traumatic stress disorder. The goal of the study was to examine and elucidate the extent to which white matter tract integrity might be impaired in WTC responders with cognitive impairment and/or post-traumatic stress disorder. Previously, the researchers had identified changes in white matter diffusivity in small numbers of responder patients.
“Our findings are by no means conclusive in terms of defining cognitive impairment or dementia in WTC responders, and if this study provides evidence of a new form of dementia emerging,” said Sean Clouston, lead author and associate professor in the Program in Public Health, and in the Department of Family, Population, and Preventive Medicine at Stony Brook University.
This rendered image of the brain via a technique called diffusion tractography reveals parts of the brain’s white matter in a compilation of WTC responders experiencing cognitive impairment. These areas depicted by various colo...
“Overall, the study supports the view that responders with cognitive impairment have neurological changes consistent with neurodegenerative disease, but they are inconclusive as to the type of disease,” he added. “Our findings do show that dementia due to post-traumatic stress disorder is clearly different from non-post-traumatic stress disorder dementia in this responder population.”
Subjects in the study were matched by age, gender, occupation, race and education. Cognitive status was determined by using the Montreal Cognitive Assessment, and post-traumatic stress disorder status was determined by using the Diagnostics and Statistics Manual-IV. The researchers used diffusion tensor imaging via a mMR scanner, and they used connectometry to examine whole-brain tract level differences in white matter integrity as reflected by fractional anistrophy values.
In summary, the team found that fractional anistrophy was negatively correlated with cognitive impairment and post-traumatic stress disorder status in the fornix, cingulum, forceps minor of the corpus callosum, and the right uncinate fasciculus. Additionally, fractional anistrophy was negatively correlated with post-traumatic stress disorder status, regardless of the cognitive impairment status in the superior thalamic radiation and the cerebellum.
The authors conclude that the brain imaging results “suggest that WTC responders with early-onset cognitive impairment may be experiencing an early neurodegenerative process characterized by decreased fractional anistrophy in white matter tracts.”
The Technique and Other Findings
Clouston and colleagues used the imaging technique diffusion tractography to examine how healthy axons are in the brain’s white matter. The technique helped to determine that responders with cognitive impairment had signatures in their white matter that did not match patterns seen in old-age Alzheimer disease and other related dementias.
By using the imaging technique, they also compared responders with post-traumatic stress disorder and dementia to those with dementia but without post-traumatic stress disorder. The imaging revealed a lot of similarities between the groups but also showed a remarkable difference in the white matter of those with post-traumatic stress disorder and dementia — showing evidence of cerebellar atrophy, a finding that is inconsistent with other studies of dementia.
Source: News Release
Stony Brook University
August 22, 2022