Apathy as a Predictor for Conversion From Mild Cognitive Impairment to Dementia: A Systematic Review and Meta-Analysis of Longitudinal Studies.
Level 3 - non-randomized controlled study
Systematic review and meta-analysis of observational longitudinal cohort studies
PubMed 35446723 · doi:10.1177/08919887221093361
What was done
A systematic review and meta-analysis of longitudinal studies identified through Medline, Embase, Cochrane Library, Epistemonikos, PsychINFO, and CINAHL following PRISMA guidelines. The authors evaluated the relationship between apathy and progression to all-cause dementia and Alzheimer's disease (AD) in individuals diagnosed with mild cognitive impairment (MCI).
What was found
Across 11 studies involving 9,504 individuals, apathy was significantly associated with conversion from MCI to dementia, yielding a pooled unadjusted hazard ratio (HR) of 1.54 (95% CI, 1.29 to 1.84). Subgroup analysis also showed a significant association with progression specifically to AD, though numerical estimates for the subgroup analysis were not reported in the abstract.
Why it matters
Identifying apathy in patients with MCI provides clinically useful prognostic information, flagging individuals at substantially higher risk of converting to dementia.
Limits
The primary pooled effect relies on unadjusted hazard ratios, leaving potential confounding variables uncontrolled. Specific criteria for defining apathy, study follow-up durations, and numerical results for subgroup analyses are not detailed in the abstract.