Abstract:
OBJECTIVES:Evidence suggests inflammation is associated with cognitive impairment, but previous epidemiological studies have reported conflicting results. DESIGN:Prospective population-based cohort. SETTING:Epidemiology of Hearing Loss Study participants. PARTICIPANTS:Individuals without cognitive impairment in 1998-2000 (N = 2,422; 1,947 with necessary data). MEASUREMENTS:Cognitive impairment (Mini-Mental State Examination score <24 or diagnosis of dementia) was ascertained in 1998-2000, 2003-2005, and 2009-2010. Serum C-reactive protein (CRP) and interleukin-6 (IL-6) were measured in 1988-1990, 1998-2000, and 2009-2010; tumor necrosis factor-alpha was measured from 1998-2000. RESULTS:Participants with high CRP in 1988-1990 and 1998-2000 had lower risk of cognitive impairment than those with low CRP at both time points (hazard ratio (HR) = 0.46, 95% confidence interval (CI) = 0.26-0.80). Risk did not differ according to 10-year IL-6 profile or baseline inflammation category in the whole cohort. In sensitivity analyses restricted to statin nonusers, those with high IL-6 at both times had greater risk of cognitive impairment than those with low IL-6 at both times (HR = 3.35, 95% CI = 1.09-10.30). In secondary analyses, each doubling of IL-6 change over 20 years was associated with greater odds of cognitive impairment in 2009-2010 in the whole cohort (odds ratio (OR) = 1.40, 95% CI = 1.04-1.89), whereas a doubling of CRP change over 20 years was associated with cognitive impairment only in statin nonusers (OR = 1.32, 95% CI = 1.06-1.65). CONCLUSION:With data collected over 20 years, this study demonstrated greater likelihood of cognitive impairment in individuals with repeated high or increasing IL-6. The inconsistent CRP findings may reflect effects of statin medications, survival effects, or adverse effects associated with chronically low CRP. Further studies of long-term inflammation and cognitive impairment are needed.
journal_name
J Am Geriatr Socjournal_title
Journal of the American Geriatrics Societyauthors
Wichmann MA,Cruickshanks KJ,Carlsson CM,Chappell R,Fischer ME,Klein BE,Klein R,Tsai MY,Schubert CRdoi
10.1111/jgs.12994subject
Has Abstractpub_date
2014-09-01 00:00:00pages
1683-91issue
9eissn
0002-8614issn
1532-5415journal_volume
62pub_type
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