Association between high-sensitivity cardiac troponin T and N-terminal pro-brain natriuretic peptide in a community based population.

Chinese medical journal

PubMedID: 24534215

Xu R, Ye P, Luo L, Sheng L, Wu H, Xiao W, Zheng J, Wang F, Xiao T. Association between high-sensitivity cardiac troponin T and N-terminal pro-brain natriuretic peptide in a community based population. Chin Med J. 2014;127(4):638-44.
BACKGROUND
N-terminal pro-B-type natriuretic peptide (NT-proBNP) and high-sensitivity cardiac troponin T (hs-cTnT) are excellent biomarkers for detecting heart failure and subclinical myocardial injury. However, it remains unclear whether subclinical myocardial injury is associated with NT-proBNP elevation in a community based population.

METHODS
In a community based study, levels of hs-cTnT and of NT-proBNP were determined in 1 497 participants older than 45 years. The lower detection limit of the hs-cTnT assay used in the present study was 0.003 ng/ml. The association of hs-cTnT levels and NT-proBNP levels was analyzed.

RESULTS
When the subjects with undetectable (<0.003 ng/ml), intermediate (0.003-0.014 ng/ml), and elevated (=0.014 ng/ml) levels of hs-cTnT were compared (r = 0.175, P < 0.001), a strong association between the hs-cTnT levels and NT-proBNP levels was observed (ß = -0.206, P < 0.001; ß = -0.118, P < 0.001, respectively). In multivariable analyses, older age and hs-cTnT were positively and independently associated with NT-proBNP levels (ß = 0.341, P < 0.001; ß = 0.143, P < 0.001, respectively), and male gender and the levels of eGFR were inversely and independently associated with NT-proBNP levels. When the subjects with normal or elevated NT-proBNP were analyzed separately, the hs-cTnT level was not an independent predictor for the NT-proBNP level in the normal NT-proBNP group, whereas the hs-cTnT level was the only independent predictor for NT-proBNP level in the elevated NT-proBNP group (ß = 0.399, P < 0.01).

CONCLUSIONS
In this community based population, NT-proBNP elevation was common. In addition to female gender and older age, subclinical myocardial injury indicated by the hs-cTnT level was another important factor in NT-proBNP elevation.