Related Experiment Videos
Mild cognitive impairment, amnestic type: an epidemiologic study.
Mary Ganguli1, Hiroko H Dodge, Changyu Shen
1Division of Geriatrics and Neuropsychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. gangulim@upmc.edu
Neurology
|July 14, 2004
Summary
Mild cognitive impairment (MCI) affects 3-4% of older adults. While individuals with MCI have a higher risk of dementia, many remain stable or return to normal cognitive function.
Area of Science:
- Neurology
- Epidemiology
- Geriatrics
Background:
- Mild cognitive impairment (MCI) is a transitional stage between normal cognition and dementia.
- Amnestic MCI, characterized by memory impairment, is a subtype of MCI.
- Understanding the prevalence and course of amnestic MCI is crucial for early intervention and management.
Purpose of the Study:
- To estimate the prevalence of amnestic MCI in a community-based sample using current diagnostic criteria.
- To examine the longitudinal course of amnestic MCI, including progression to dementia and reversion to normal cognition.
Main Methods:
- A prospective epidemiologic study cohort of 1,248 individuals (mean age 74.6 years) was retrospectively analyzed.
- Petersen's amnestic MCI criteria were applied, assessing memory, mental status, daily functioning, memory complaint, and absence of dementia.
- Data were collected biennially over a 10-year follow-up period.
Main Results:
- The prevalence of amnestic MCI ranged from 2.9% to 4.0% across five assessments.
- Of individuals with MCI at baseline, 27% developed dementia over 10 years, with an increased risk of 3.9 (95% CI = 2.1 to 7.2).
- Progression to Alzheimer's disease occurred in 11.1% to 16.7% of MCI cases, while 11.1% to 21.2% remained MCI, and a significant portion reverted to normal.
Conclusions:
- Approximately 3% to 4% of non-demented individuals in this community sample met criteria for amnestic MCI.
- Despite an elevated risk of dementia, a substantial proportion of individuals with amnestic MCI demonstrated stability or reversion to normal cognitive function.
- Amnestic MCI, as currently defined, represents a heterogeneous group with varying prognoses, highlighting the need for refined diagnostic and prognostic tools.