NT-ProBNP and high-sensitivity troponin T as screening tests for subclinical chronic heart failure in a general population.

AIMS

The aim of this study was to establish age-specific and sex-specific cut-off values for N-terminal pro-brain natriuretic peptide (NT-proBNP) and high-sensitivity troponin T (hs-troponin T) in healthy subjects and assess cardiac biomarkers as screening tools for subclinical heart failure (HF) in a general population.

METHODS AND RESULTS

Altogether, 1936 participants were randomly selected from the general population Tromsø 7 study in Northern Norway. Diagnostic accuracy (sensitivity, specificity, and negative and positive predictive value) of cardiac markers for echocardiographically defined subclinical HF was evaluated. The receiver-operating characteristic analysis showed that areas under the curve were relatively low (under 0.75) for both NT-proBNP and hs-troponin T, suggesting that the diagnostic accuracy of these biomarkers for subclinical HF was not excellent, especially for mild forms of HF and younger age group 40-49 years. Sex-specific and age-specific cut-offs for hs-troponin T (99th percentiles) and NT-proBNP (97.5th percentiles) were established in healthy subjects from the same general population. The sex-specific and age-specific cut-offs for NT-proBNP had higher specificity for subclinical HF compared with the previously established single cut-off 125 pg/mL. Age-specific cut-off for hs-troponin T (18 ng/L) for men ≥60 years had also higher specificity than the single cut-off 14 ng/L. These cut-offs had high specificity, but low sensitivity, that makes hs-troponin T and NT-proBNP good biomarkers to rule in HF in case of a positive test, but not good enough to rule out all unrecognized HF due to false negative results.

CONCLUSIONS

N-terminal pro-brain natriuretic peptide and hs-troponin T are suboptimal screening tools for subclinical HF in a general population due to low sensitivity.