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Investigating the relationship between mild traumatic brain injury and Alzheimer’s disease and related dementias: a systematic review

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Abstract

The objective of this systematic review is to synthesize the relevant literature published after 2016 to ascertain the current landscape of science that relates mild traumatic brain injury (mTBI) to the onset of Alzheimer’s disease and related dementias (ADRD) and identify areas of need for future research. We conducted database searches and retrieved articles that were published after 2016 that utilized cognitive assessments to understand the relationship between mTBI and ADRD. We identified eight relevant articles in the review process, four of which presented a significant relationship between mTBI and disease or cognitive impairment outcomes. The studies included in this systematic review underscore the need for future research investigating a possible causal relationship between mTBI and ADRDs given the high prevalence of mTBI among brain injury patients and the lack of literature specifically addressing this issue. Future research should standardize the definitions of mTBI, AD, and ADRDs to create reliable and reproducible results that more comprehensively capture the nuances of this relationship.

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Funding

NIA K-01 Award Grant #1 K01 AG054762-01A1.

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Contributions

RWT conceptualized this systematic review. ES, EC, CM, AK, and SF created the search strategy, exclusion criteria, and methodology. EC and AK screened and selected studies, performed quality assessment, assessed bias, and performed data extraction. All authors discussed the results of the selected studies. EC, CM, AK, and NVN created the initial draft. RWT, RM, EC, NVN, AK, and CM critically reviewed and revised the manuscript. The team was supervised by RWT.

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Correspondence to Robert W. Turner II.

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Clark, E., Faruque, S., Mutebi, C. et al. Investigating the relationship between mild traumatic brain injury and Alzheimer’s disease and related dementias: a systematic review. J Neurol 269, 4635–4645 (2022). https://doi.org/10.1007/s00415-022-11186-9

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