Amyloid PET and clinical management in a diverse, cognitively impaired population: The New IDEAS Study

Abstract

Introduction: The New Imaging Dementia-Evidence for Amyloid Scanning (IDEAS) study (NCT04426539) evaluated the association between amyloid positron emission tomography (PET) and changes in clinical management among ethnoracially diverse, clinically heterogeneous patients.

Methods: We assessed diagnosis and management plan before and 90 ± 30 days after amyloid PET among Medicare beneficiaries who met 2018 National Institute on Aging-Alzheimer's Association criteria for mild cognitive impairment (MCI) or dementia. We aimed to identify ≥ 30% change in a composite patient management endpoint (CPME; i.e., changes in Alzheimer's disease [AD]/non-AD medications, changes in counseling).

Results: Among 5757 participants (median age 75 years; 21.7% Black, 20.3% Latinx, 58.1% all other races/ethnicities [AORE]), a change in CPME occurred in 59.0% (95% confidence interval 57.6%-60.5%) of individuals post PET. Change varied by ethnoracial identity and type of clinical presentation: Black (MCI: 55.3%, dementia: 55.8%), Latinx (MCI: 53.7%, dementia: 61.9%), AORE (MCI: 62.0%, dementia: 58.3%), typical (MCI: 64.8%, dementia: 60.9%), atypical (MCI 45.5%, dementia: 53.6%).

Discussion: Amyloid PET is associated with clinical management among diverse, clinically heterogeneous populations.

Highlights: Changes in management plan occurred in 59% of patients 90 days after amyloid positron emission tomography. Rates of change in management exceeded the pre-specified goal of > 30% across ethnoracial groups. Rates of change in management also exceeded > 30% among amnestic and non-amnestic Alzheimer's disease presentations.

Keywords: Alzheimer's disease; Medicare; amyloid positron emission tomography; dementia; ethnicity; mild cognitive impairment.