Anosognosia g pIS an independent py g predictor of conversion y From mild cognitive impairment to Alzheimer’s disease and is associated with reduced brain metabolism

Alzheimer’s Disease Neuroimaging Initiative

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Objective: Anosognosia, or impaired illness awareness, is a common feature of Alzheimer’s disease (AD) and less so of mild cognitive impairment (MCI). Importantly, anosognosia negatively influences clinical outcomes for patients and their caregivers and may predict the conversion from MCI to AD. This study aimed to examine (1) the relationship between brain glucose metabolism as measured by fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) and anosognosia in patients with MCI and AD and (2) the predictive utility of anosognosia in patients with MCI for later conversion to AD, even when controlling for other factors, including gender, education, apolipoprotein E ε4 carrier status, dementia severity, and cognitive dysfunction. Methods: Data for 1,062 participants from the Alzheimer’s Disease Neuroimaging Initiative database (2003 to August 2015) classified as having AD (n = 191) or MCI (n = 499) or as healthy comparison (HC) subjects (n = 372) were analyzed. HC participants had Mini-Mental State Examination (MMSE) scores from 24 to 30 and a Clinical Dementia Rating (CDR) of 0. MCI participants had MMSE scores from 24 to 30, a memory complaint, objective memory loss, a CDR of 0.5, absence of significant levels of impairment in other cognitive domains, and essentially preserved activities of daily living. AD participants had MMSE scores ≤ 26 and a CDR of ≥ 0.5, and met National Institute of Neurological and Communicative Disorders and Stroke–Alzheimer’s Disease and Related Disorders Association criteria for probable AD. Anosognosia was measured with the composite discrepancy score of the study partner and participants’ scores on the Everyday Cognition scale (ECog). Bivariate correlations and multiple regression analyses were performed to assess the relationship between anosognosia and FDG-PET findings in each group. Lastly, logistic regression and receiver operating characteristic curve analyses were performed in the MCI sample to determine if anosognosia was predictive of conversion from MCI to AD. Results: Hypometabolism was independently associated with anosognosia in AD, particularly in the posterior cingulate cortex and right angular gyrus. Anosognosia was associated with conversion from MCI to AD within 5 years (OR = 2.74 [95% CI, 1.95 to 3.85], χ2 1 = 33.65, P< .001), even after including covariates (OR = 1.64 [95% CI, 1.12 to 2.40], χ2 1 = 6.43, P= .011). ECog-composite scores ≤ −0.75 were 93% sensitive and 15% specific for conversion from MCI to AD. Conclusions: Anosognosia in AD is related to brain glucose hypometabolism. Further, anosognosia independently predicts conversion from MCI to AD. The absence of anosognosia may be clinically useful to identify those patients that are unlikely to convert from MCI to AD.

Original languageEnglish
Pages (from-to)e1187-e1196
JournalJournal of Clinical Psychiatry
Volume78
Issue number9
DOIs
Publication statusPublished - 2017 Nov 1
Externally publishedYes

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Agnosia
Alzheimer Disease
Brain
Dementia
Positron-Emission Tomography
Cognitive Dysfunction
Cognition
Healthy Volunteers
Communication Disorders
Apolipoprotein E4
Glucose
Parietal Lobe
Gyrus Cinguli
Fluorodeoxyglucose F18
Memory Disorders
Activities of Daily Living
Nervous System Diseases
Neuroimaging
ROC Curve
Caregivers

ASJC Scopus subject areas

  • Psychiatry and Mental health

Cite this

Anosognosia g pIS an independent py g predictor of conversion y From mild cognitive impairment to Alzheimer’s disease and is associated with reduced brain metabolism. / Alzheimer’s Disease Neuroimaging Initiative.

In: Journal of Clinical Psychiatry, Vol. 78, No. 9, 01.11.2017, p. e1187-e1196.

Research output: Contribution to journalArticle

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title = "Anosognosia g pIS an independent py g predictor of conversion y From mild cognitive impairment to Alzheimer’s disease and is associated with reduced brain metabolism",
abstract = "Objective: Anosognosia, or impaired illness awareness, is a common feature of Alzheimer’s disease (AD) and less so of mild cognitive impairment (MCI). Importantly, anosognosia negatively influences clinical outcomes for patients and their caregivers and may predict the conversion from MCI to AD. This study aimed to examine (1) the relationship between brain glucose metabolism as measured by fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) and anosognosia in patients with MCI and AD and (2) the predictive utility of anosognosia in patients with MCI for later conversion to AD, even when controlling for other factors, including gender, education, apolipoprotein E ε4 carrier status, dementia severity, and cognitive dysfunction. Methods: Data for 1,062 participants from the Alzheimer’s Disease Neuroimaging Initiative database (2003 to August 2015) classified as having AD (n = 191) or MCI (n = 499) or as healthy comparison (HC) subjects (n = 372) were analyzed. HC participants had Mini-Mental State Examination (MMSE) scores from 24 to 30 and a Clinical Dementia Rating (CDR) of 0. MCI participants had MMSE scores from 24 to 30, a memory complaint, objective memory loss, a CDR of 0.5, absence of significant levels of impairment in other cognitive domains, and essentially preserved activities of daily living. AD participants had MMSE scores ≤ 26 and a CDR of ≥ 0.5, and met National Institute of Neurological and Communicative Disorders and Stroke–Alzheimer’s Disease and Related Disorders Association criteria for probable AD. Anosognosia was measured with the composite discrepancy score of the study partner and participants’ scores on the Everyday Cognition scale (ECog). Bivariate correlations and multiple regression analyses were performed to assess the relationship between anosognosia and FDG-PET findings in each group. Lastly, logistic regression and receiver operating characteristic curve analyses were performed in the MCI sample to determine if anosognosia was predictive of conversion from MCI to AD. Results: Hypometabolism was independently associated with anosognosia in AD, particularly in the posterior cingulate cortex and right angular gyrus. Anosognosia was associated with conversion from MCI to AD within 5 years (OR = 2.74 [95{\%} CI, 1.95 to 3.85], χ2 1 = 33.65, P< .001), even after including covariates (OR = 1.64 [95{\%} CI, 1.12 to 2.40], χ2 1 = 6.43, P= .011). ECog-composite scores ≤ −0.75 were 93{\%} sensitive and 15{\%} specific for conversion from MCI to AD. Conclusions: Anosognosia in AD is related to brain glucose hypometabolism. Further, anosognosia independently predicts conversion from MCI to AD. The absence of anosognosia may be clinically useful to identify those patients that are unlikely to convert from MCI to AD.",
author = "{Alzheimer’s Disease Neuroimaging Initiative} and Philip Gerretsen and Chung, {Jun Ku} and Parita Shah and Eric Plitman and Yusuke Iwata and Fernando Caravaggio and Shinichiro Nakajima and Pollock, {Bruce G.} and Ariel Graff-Guerrero",
year = "2017",
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TY - JOUR

T1 - Anosognosia g pIS an independent py g predictor of conversion y From mild cognitive impairment to Alzheimer’s disease and is associated with reduced brain metabolism

AU - Alzheimer’s Disease Neuroimaging Initiative

AU - Gerretsen, Philip

AU - Chung, Jun Ku

AU - Shah, Parita

AU - Plitman, Eric

AU - Iwata, Yusuke

AU - Caravaggio, Fernando

AU - Nakajima, Shinichiro

AU - Pollock, Bruce G.

AU - Graff-Guerrero, Ariel

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Objective: Anosognosia, or impaired illness awareness, is a common feature of Alzheimer’s disease (AD) and less so of mild cognitive impairment (MCI). Importantly, anosognosia negatively influences clinical outcomes for patients and their caregivers and may predict the conversion from MCI to AD. This study aimed to examine (1) the relationship between brain glucose metabolism as measured by fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) and anosognosia in patients with MCI and AD and (2) the predictive utility of anosognosia in patients with MCI for later conversion to AD, even when controlling for other factors, including gender, education, apolipoprotein E ε4 carrier status, dementia severity, and cognitive dysfunction. Methods: Data for 1,062 participants from the Alzheimer’s Disease Neuroimaging Initiative database (2003 to August 2015) classified as having AD (n = 191) or MCI (n = 499) or as healthy comparison (HC) subjects (n = 372) were analyzed. HC participants had Mini-Mental State Examination (MMSE) scores from 24 to 30 and a Clinical Dementia Rating (CDR) of 0. MCI participants had MMSE scores from 24 to 30, a memory complaint, objective memory loss, a CDR of 0.5, absence of significant levels of impairment in other cognitive domains, and essentially preserved activities of daily living. AD participants had MMSE scores ≤ 26 and a CDR of ≥ 0.5, and met National Institute of Neurological and Communicative Disorders and Stroke–Alzheimer’s Disease and Related Disorders Association criteria for probable AD. Anosognosia was measured with the composite discrepancy score of the study partner and participants’ scores on the Everyday Cognition scale (ECog). Bivariate correlations and multiple regression analyses were performed to assess the relationship between anosognosia and FDG-PET findings in each group. Lastly, logistic regression and receiver operating characteristic curve analyses were performed in the MCI sample to determine if anosognosia was predictive of conversion from MCI to AD. Results: Hypometabolism was independently associated with anosognosia in AD, particularly in the posterior cingulate cortex and right angular gyrus. Anosognosia was associated with conversion from MCI to AD within 5 years (OR = 2.74 [95% CI, 1.95 to 3.85], χ2 1 = 33.65, P< .001), even after including covariates (OR = 1.64 [95% CI, 1.12 to 2.40], χ2 1 = 6.43, P= .011). ECog-composite scores ≤ −0.75 were 93% sensitive and 15% specific for conversion from MCI to AD. Conclusions: Anosognosia in AD is related to brain glucose hypometabolism. Further, anosognosia independently predicts conversion from MCI to AD. The absence of anosognosia may be clinically useful to identify those patients that are unlikely to convert from MCI to AD.

AB - Objective: Anosognosia, or impaired illness awareness, is a common feature of Alzheimer’s disease (AD) and less so of mild cognitive impairment (MCI). Importantly, anosognosia negatively influences clinical outcomes for patients and their caregivers and may predict the conversion from MCI to AD. This study aimed to examine (1) the relationship between brain glucose metabolism as measured by fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) and anosognosia in patients with MCI and AD and (2) the predictive utility of anosognosia in patients with MCI for later conversion to AD, even when controlling for other factors, including gender, education, apolipoprotein E ε4 carrier status, dementia severity, and cognitive dysfunction. Methods: Data for 1,062 participants from the Alzheimer’s Disease Neuroimaging Initiative database (2003 to August 2015) classified as having AD (n = 191) or MCI (n = 499) or as healthy comparison (HC) subjects (n = 372) were analyzed. HC participants had Mini-Mental State Examination (MMSE) scores from 24 to 30 and a Clinical Dementia Rating (CDR) of 0. MCI participants had MMSE scores from 24 to 30, a memory complaint, objective memory loss, a CDR of 0.5, absence of significant levels of impairment in other cognitive domains, and essentially preserved activities of daily living. AD participants had MMSE scores ≤ 26 and a CDR of ≥ 0.5, and met National Institute of Neurological and Communicative Disorders and Stroke–Alzheimer’s Disease and Related Disorders Association criteria for probable AD. Anosognosia was measured with the composite discrepancy score of the study partner and participants’ scores on the Everyday Cognition scale (ECog). Bivariate correlations and multiple regression analyses were performed to assess the relationship between anosognosia and FDG-PET findings in each group. Lastly, logistic regression and receiver operating characteristic curve analyses were performed in the MCI sample to determine if anosognosia was predictive of conversion from MCI to AD. Results: Hypometabolism was independently associated with anosognosia in AD, particularly in the posterior cingulate cortex and right angular gyrus. Anosognosia was associated with conversion from MCI to AD within 5 years (OR = 2.74 [95% CI, 1.95 to 3.85], χ2 1 = 33.65, P< .001), even after including covariates (OR = 1.64 [95% CI, 1.12 to 2.40], χ2 1 = 6.43, P= .011). ECog-composite scores ≤ −0.75 were 93% sensitive and 15% specific for conversion from MCI to AD. Conclusions: Anosognosia in AD is related to brain glucose hypometabolism. Further, anosognosia independently predicts conversion from MCI to AD. The absence of anosognosia may be clinically useful to identify those patients that are unlikely to convert from MCI to AD.

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