Serum high sensitivity C-reactive protein and cognitive function in elderly women.

BACKGROUND: Inflammation has been linked to cognitive impairment. However, limited data are available on the association between inflammatory markers and cognitive function.

OBJECTIVES: We tested the hypothesis that elevated serum concentration of high sensitivity C-reactive protein (hs-CRP), an established marker of low-grade inflammation, predicts cognitive impairment in elderly women.

DESIGN: A 12-year population-based follow-up study.

PARTICIPANTS: A total of 97 women between 60 and 70 years of age at baseline.

METHODS: Serum hs-CRP concentration was measured by a high sensitivity assay. Global cognitive function was measured with the Mini-Mental State Examination (MMSE), and memory and cognitive speed were measured with a detailed cognitive test battery.

RESULTS: Higher baseline hs-CRP was associated with poorer memory at 12-year follow-up without adjustment and after adjustment for age, education and depression (standardised regression coefficient beta -0.842, 95% confidence interval -1.602 to -0.083, P = 0.030), and further adjustment for the use of hormone replacement therapy, smoking, serum LDL cholesterol and body mass index (standardised regression coefficient beta -0.817, 95% confidence interval -1.630 to -0.004, P = 0.049). Memory at 12-year follow-up worsened linearly with increasing hs-CRP at baseline (P = 0.048 for linear trend). There was no association between hs-CRP at baseline and cognitive speed or MMSE score at 12-year follow-up.

CONCLUSIONS: High serum hs-CRP concentration predicts poorer memory 12 years later in elderly women. Hs-CRP may be a useful biomarker to identify individuals at an increased risk for cognitive decline.