{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T17:20:16Z","timestamp":1777396816357,"version":"3.51.4"},"reference-count":40,"publisher":"SAGE Publications","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAD"],"published-print":{"date-parts":[[2024,1,30]]},"abstract":"<jats:p>Background: Elevated amyloid-\u03b2 (A\u03b2) on positron emission tomography (PET) scan is used to aid diagnosis of Alzheimer\u2019s disease (AD), but many prior studies have focused on patients with a typical AD phenotype such as amnestic mild cognitive impairment (MCI). Little is known about whether elevated A\u03b2 on PET scan predicts rate of cognitive and functional decline among those with MCI or dementia that is clinically less typical of early AD, thus leading to etiologic uncertainty. Objective: We aimed to investigate whether elevated A\u03b2 on PET scan predicts cognitive and functional decline over an 18-month period in those with MCI or dementia of uncertain etiology. Methods: In 1,028 individuals with MCI or dementia of uncertain etiology, we evaluated the association between elevated A\u03b2 on PET scan and change on a telephone cognitive status measure administered to the participant and change in everyday function as reported by their care partner. Results: Individuals with either MCI or dementia and elevated A\u03b2 (66.6% of the sample) showed greater cognitive decline compared to those without elevated A\u03b2 on PET scan, whose cognition was relatively stable over 18 months. Those with either MCI or dementia and elevated A\u03b2 were also reported to have greater functional decline compared to those without elevated A\u03b2, even though the latter group showed significant care partner-reported functional decline over time. Conclusions: Elevated A\u03b2 on PET scan can be helpful in predicting rates of both cognitive and functional decline, even among cognitively impaired individuals with atypical presentations of AD.<\/jats:p>","DOI":"10.3233\/jad-230950","type":"journal-article","created":{"date-parts":[[2024,1,30]],"date-time":"2024-01-30T11:55:40Z","timestamp":1706615740000},"page":"1161-1171","source":"Crossref","is-referenced-by-count":2,"title":["Elevated Amyloid-\u03b2 PET Scan and Cognitive and Functional Decline in Mild Cognitive Impairment and Dementia of Uncertain Etiology"],"prefix":"10.1177","volume":"97","author":[{"given":"Brenda L.","family":"Plassman","sequence":"first","affiliation":[{"name":"Department of Psychiatry and Behavioral Sciences, School of Medicine, Duke University, Durham, NC, USA"},{"name":"Department of Neurology, School of Medicine, Duke University, NC, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cassie 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E.","family":"Shepherd-Banigan","sequence":"additional","affiliation":[{"name":"Department of Population Health Sciences, Duke University, Durham, NC, USA"},{"name":"Durham ADAPT, Durham Veterans Affairs Medical Center, Durham, NC, USA"},{"name":"Duke-Margolis Center for Health Policy, Durham, NC, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elyse","family":"Couch","sequence":"additional","affiliation":[{"name":"Department of Health Services Policy and Practice, School of Public Health, Brown University, Providence, RI, USA."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eric","family":"Jutkowitz","sequence":"additional","affiliation":[{"name":"Department of Health Services Policy and Practice, School of Public Health, Brown University, Providence, RI, USA."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emily C.","family":"O\u2019Brien","sequence":"additional","affiliation":[{"name":"Department of Population Health Sciences, 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