Introduction: There is evidence of an association between markers of cardiac injury and cognition in patients with cardiovascular disease. We hypothesized that levels of high-sensitivity cardiac troponin T (hs-cTnT) are associated with cognitive performance and cognitive decline in a population of predominantly healthy older adults.
Methods: We included 1,226 predominantly healthy adults ≥60 years from the Berlin Aging Study II. Participants were recruited from the general population of the Berlin metropolitan area from 2009 to 2014. At baseline, participants underwent measurement of hs-cTnT and cognitive testing using the extended Consortium to Establish a Registry for Alzheimer's Disease (CERAD-Plus) battery. In addition, the Digit Symbol Substitution Test (DSST) was performed at baseline and at follow-up (7.3 ± 1.4 years after the baseline visit). The CERAD test results were summarized into four cognitive domains (processing speed, executive function, visuo-construction, and memory). After summing-up the respective raw scores, we calculated standardized z scores. We performed unadjusted and adjusted linear regression models to assess links between hs-cTnT and cognitive domains. We used linear mixed models to analyze associations between hs-cTnT and cognitive decline according to changes in DSST scores over time.
Results: The mean age of study participants at baseline was 68.5 (±3.6) years, 49% were female, and median hs-cTnT levels were 6 ng/L (IQR 4-8 ng/L). We detected no significant association between hs-cTnT and different cognitive domains at baseline after adjustment for age, sex, education, and cardiovascular risk factors. Hs-cTnT was associated with cognitive decline, which remained statistically significant after full adjustment (adjusted beta-coefficient -0.82 (-1.28 to -0.36), p = 0.001). After stratification for sex, the association with hs-cTnT remained statistically significant in men but not in women.
Conclusion: Higher hs-cTnT levels in older men are associated with cognitive decline measured with the DSST.
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