Cardiac biomarkers in pediatric CKD-a prospective follow-up study

Background The N-terminal pro-B-type natriuretic peptide (NT-proBNP) and high-sensitive cardiac-specific troponin T (hs-cTnT) are associated with abnormal cardiac structure and function and an increased risk of cardiovascular death in chronic kidney disease (CKD) patients. There is limited knowledge about these cardiac markers in pediatric CKD patients. Methods Longitudinal levels of NT-proBNP and hs-cTnT were analyzed in 48 pediatric patients, 22 with CKD (GFR range 8.8-68 mL/min/1.73 m(2)) and 26 transplanted patients (CKD-T; GFR range 30-99 mL/min/1.73 m(2)). Follow-up was scheduled after 1 and 3 years. Longitudinal patterns and associations to kidney function, cardiovascular risk markers, and echocardiographic parameters were assessed. Results High NT-proBNP was present in 27% of CKD and 11% of CKD-T patients. Similarly 32% of CKD and 8% of CKD-T patients had elevated hs-cTnT levels. In longitudinal multivariate analyses, high log NT-proBNP was associated with low GFR (beta = - 0.01, p = 0.01) and elevated left ventricular mass index (LVMI; beta = 0.02, p = 0.05). The strong association to LVMI remained when using GFR-adjusted NT-proBNP in similar analysis. Patients with left ventricular hypertrophy (LVH) also had higher NT-proBNP (235 [146-301] ng/L) than patients without LVH (86 [11-477] ng/L), p = 0.02. High hs-cTnT over-time was also associated with low GFR (beta = - 0.007, p = 0.01) and a low cc-TDI e/a, indicating a worse LV diastolic function (beta = - 0.09, p = 0.05). This association did not persist for GFR-adjusted hs-cTnT. Conclusions NT-proBNP and hs-cTnT are elevated in pediatric CKD and CKD-T patients. GFR-adjusted NT-proBNP was associated with longitudinal levels of elevated LVMI suggesting this might be a marker for early subclinical myocardial damage.

Automated summary

This study analyzed the longitudinal levels of cardiac markers NT-proBNP and hs-cTnT in pediatric CKD and CKD-T patients. The study found that these markers were elevated in pediatric CKD and CKD-T patients and were associated with kidney function, cardiovascular risk markers, and echocardiographic parameters.