Trajectories of olfactory identification preceding incident mild cognitive impairment and dementia: a longitudinal study

The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. Within the R...

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Published inEBioMedicine Vol. 98; p. 104862
Main Authors Guo, Jie, Dove, Abigail, Wang, Jiao, Laukka, Erika J., Ekström, Ingrid, Dunk, Michelle M., Bennett, David A., Xu, Weili
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.12.2023
Elsevier
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ISSN2352-3964
2352-3964
DOI10.1016/j.ebiom.2023.104862

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Abstract The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. Within the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales. Compared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β −0.09 [95% CI −0.13, −0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year −5: −0.39 [−0.71, −0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β −0.19 [−0.36, −0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year −3: −0.95 [−1.67, −0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer’s disease pathology, neurofibrillary tangles, and amyloid beta load. Olfactory identification declined faster preceding dementia disorders and Alzheimer’s pathology may underlie these faster declines. This study was funded by the National Institutes of Health (R01AG17917) and Swedish Research Council (2021-01647).
AbstractList The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. Within the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales. Compared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β −0.09 [95% CI −0.13, −0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year −5: −0.39 [−0.71, −0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β −0.19 [−0.36, −0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year −3: −0.95 [−1.67, −0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer’s disease pathology, neurofibrillary tangles, and amyloid beta load. Olfactory identification declined faster preceding dementia disorders and Alzheimer’s pathology may underlie these faster declines. This study was funded by the National Institutes of Health (R01AG17917) and Swedish Research Council (2021-01647).
SummaryBackgroundThe pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. MethodsWithin the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales. FindingsCompared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β −0.09 [95% CI −0.13, −0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year −5: −0.39 [−0.71, −0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β −0.19 [−0.36, −0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year −3: −0.95 [−1.67, −0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer’s disease pathology, neurofibrillary tangles, and amyloid beta load. InterpretationOlfactory identification declined faster preceding dementia disorders and Alzheimer’s pathology may underlie these faster declines. FundingThis study was funded by the National Institutes of Health ( R01AG17917) and Swedish Research Council ( 2021-01647).
The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. Within the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analysed using mixed-effect models with backward timescales. Compared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β -0.09 [95% CI -0.13, -0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year -5: -0.39 [-0.71, -0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β -0.19 [-0.36, -0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year -3: -0.95 [-1.67, -0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer’s disease pathology, neurofibrillary tangles, and amyloid beta load. Olfactory identification declined faster preceding dementia disorders and Alzheimer’s pathology may underlie these faster declines.
The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories. Within the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales. Compared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β -0.09 [95% CI -0.13, -0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year -5: -0.39 [-0.71, -0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β -0.19 [-0.36, -0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year -3: -0.95 [-1.67, -0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer's disease pathology, neurofibrillary tangles, and amyloid beta load. Olfactory identification declined faster preceding dementia disorders and Alzheimer's pathology may underlie these faster declines. This study was funded by the National Institutes of Health (R01AG17917) and Swedish Research Council (2021-01647).
The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories.BACKGROUNDThe pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories preceding incident mild cognitive impairment (MCI) and dementia and explore the role of brain pathologies in these trajectories.Within the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales.METHODSWithin the Rush Memory and Aging Project, 1318 dementia-free older adults were followed annually for up to 11 years. Olfactory identification was assessed using the Brief Smell Identification Test annually. Of 900 cognitively intact participants, incident MCI and dementia were diagnosed following standard criteria. Over follow-up, 518 participants died and underwent brain autopsies for neuropathological assessment. Data were analyzed using mixed-effect models with backward timescales.Compared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β -0.09 [95% CI -0.13, -0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year -5: -0.39 [-0.71, -0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β -0.19 [-0.36, -0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year -3: -0.95 [-1.67, -0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer's disease pathology, neurofibrillary tangles, and amyloid beta load.FINDINGSCompared to participants who remained cognitively intact, olfactory identification declined faster among those who developed MCI (β -0.09 [95% CI -0.13, -0.05]), leading to a significantly lower olfactory identification starting from five years preceding MCI diagnosis (mean difference at year -5: -0.39 [-0.71, -0.07]). Among participants with incident MCI, olfactory identification declined faster in those who developed dementia compared to those who did not (β -0.19 [-0.36, -0.01]), leading to a significantly lower olfactory identification starting from three years preceding dementia diagnosis (mean difference at year -3: -0.95 [-1.67, -0.23]). A faster decline in olfactory identification was associated with higher burdens of global Alzheimer's disease pathology, neurofibrillary tangles, and amyloid beta load.Olfactory identification declined faster preceding dementia disorders and Alzheimer's pathology may underlie these faster declines.INTERPRETATIONOlfactory identification declined faster preceding dementia disorders and Alzheimer's pathology may underlie these faster declines.This study was funded by the National Institutes of Health (R01AG17917) and Swedish Research Council (2021-01647).FUNDINGThis study was funded by the National Institutes of Health (R01AG17917) and Swedish Research Council (2021-01647).
ArticleNumber 104862
Author Xu, Weili
Guo, Jie
Wang, Jiao
Dunk, Michelle M.
Bennett, David A.
Ekström, Ingrid
Laukka, Erika J.
Dove, Abigail
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Keywords Olfactory identification
Brain pathology
Trajectory
Mild cognitive impairment
Dementia
Language English
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Snippet The pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory identification trajectories...
SummaryBackgroundThe pattern of olfactory identification change in the early phases of dementing disorders is unclear. We aimed to assess olfactory...
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SubjectTerms Advanced Basic Science
Aged
Alzheimer Disease - diagnosis
Alzheimer Disease - epidemiology
Amyloid beta-Peptides
Brain pathology
Cognitive Dysfunction - diagnosis
Cognitive Dysfunction - epidemiology
Dementia
Humans
Internal Medicine
Longitudinal Studies
Mild cognitive impairment
Olfactory identification
Smell
Trajectory
United States
Title Trajectories of olfactory identification preceding incident mild cognitive impairment and dementia: a longitudinal study
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https://www.clinicalkey.es/playcontent/1-s2.0-S2352396423004280
https://dx.doi.org/10.1016/j.ebiom.2023.104862
https://www.ncbi.nlm.nih.gov/pubmed/38251465
https://www.proquest.com/docview/2917553316
https://pubmed.ncbi.nlm.nih.gov/PMC10628348
http://kipublications.ki.se/Default.aspx?queryparsed=id:154207443
Volume 98
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