Frailty Linked to Dementia Onset 2-3 Years Earlier

TOPLINEFrailty was associated with a dementia diagnosis 2-3 years earlier overall in community-dwelling older adults, a study showed. The association was stronger among men than among women, and among individuals with frailty who died with a low neuropathologic burden, dementia onset was observed about 5-6 years earlier.METHODOLOGYResearchers conducted a secondary analysis of data from 1614 community-dwelling older adults without dementia (mean age, 79.6 years; 75% women; 93% White individuals). The data were obtained from the MAP study in Illinois for the period 1997-2024.Frailty was quantified using frailty index scores (the proportion of deficits present among all deficits assessed), with scores ≥ 0.25 indicating frailty; 24% of the participants met this threshold at baseline.Researchers assessed the age at all-cause dementia diagnosis, determined through annual cognitive assessments, neuropsychological review, and clinical diagnosis. In a subset of 906 participants who died and underwent autopsy, neuropathologic burden was quantified using a 10-item index of Alzheimer's disease and mixed brain pathology markers.The analysis was adjusted for sex, educational attainment, and apolipoprotein E4 status, and the median follow-up was 7 years.TAKEAWAYA total of 531 incident dementia cases were detected (incidence rate, 4.3 per 100 person-years), and the mean age at dementia diagnosis was 88.9 years. Each 0.1 increase in frailty index scores was linked to dementia being diagnosed at an age 1.8% younger (time ratio [TR], 0.98; 95% CI, 0.97-0.99); participants with frailty were diagnosed with dementia at a younger age (by 3.6%; TR, 0.96; 95% CI, 0.95-0.98) than those without frailty. The association was more pronounced among men than among women: men with frailty were diagnosed with dementia at an age 8% younger (TR, 0.92; 95% CI, 0.88-0.96) than that of men without frailty, and women with frailty were diagnosed with dementia at an age 2.6% younger (TR, 0.97; 95% CI, 0.96-0.99) than that of women without frailty.Each 0.1 increase in frailty index scores among participants with a low neuropathologic burden was linked to dementia being diagnosed at an age 5.1% younger (TR, 0.95; 95% CI, 0.92-0.98), whereas no significant association was observed among participants with an intermediate (TR, 0.99; 95% CI, 0.96-1.03) or high (TR, 0.99; 95% CI, 0.95-1.03) neuropathologic burden.Among individuals with a low neuropathologic burden, those with frailty were diagnosed with dementia at an age 9.8% younger (TR, 0.90; 95% CI, 0.85-0.96) than those without frailty.IN PRACTICE"Routine frailty measurement may aid prognostication, risk stratification and interpretation of cognitive symptoms in neurology and memory clinics. Addressing frailty could represent a modifiable target to potentially delay dementia onset and inform care, particularly among patients with limited underlying neuropathological disease," the investigators wrote.SOURCEThe study was led by Tom R. Strating, Frazer Institute, Faculty of Health, Medicine and Behavioural Sciences, The University of Queensland, Woolloongabba, Queensland, Australia. It was published online in the October issue of the Journal of Neurology, Neurosurgery & Psychiatry.LIMITATIONSNeuropathology was measured post-mortem (median 1 year after last cognitive evaluation), limiting interpretation as a baseline risk factor. Residual confounding could not be ruled out. The sample included predominantly White participants, limiting generalizability to other populations.DISCLOSURESThis study did not receive any specific funding. The MAP study was funded by the National Institute on Aging. Disclosure information for the study investigators is available in the original study publication.This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.