Publication date: Available online 27 February 2017
Source:Clinical Biochemistry
Author(s): Esther N. Klein Hesselink, Anouk N.A. van der Horst-Schrivers, Iwan C.C. van der Horst, Stephan J.L. Bakker, Anneke C. Muller Kobold, Adrienne H. Brouwers, Geertruida H. de Bock, Jourik A. Gietema, Robin P.F. Dullaart, Thera P. Links, Joop D. Lefrandt
IntroductionChronic suppression of TSH in patients treated for differentiated thyroid carcinoma (DTC) may induce cardiac damage and increase risk for cardiovascular events and premature mortality. We aimed to compare circulating concentrations of N-terminal pro Brain Natriuretic Peptide (NT-proBNP) of DTC patients with controls, and to investigate whether higher NT-proBNP is associated with an increased risk for cardiovascular events and all-cause mortality in DTC patients.MethodsSerum NT-proBNP levels were determined in 266 DTC patients, median 10.4 [IQR 4.1–18.5] years after DTC diagnosis, and compared to 798 age- and sex-matched controls. Using multivariable Cox regression analyses, the association of NT-proBNP with cardiovascular events and all-cause mortality was determined. Hazard ratios (HR) and 95% confidence intervals (CIs) were expressed per SD increase of log-transformed NT-proBNP.ResultsMean age±SD of DTC patients and controls was 54.8±14.5 and 54.8±12.8years, respectively; 74% were women. Median NT-proBNP level was 70 [40–119] ng/L for DTC patients vs. 49 [25–89] ng/L for controls (p<0.001). During median follow-up of 8.6 [6.6–9.0] years, 30 DTC patients (11.4%) had a cardiovascular event and 38 (14.4%) died. Higher NT-proBNP was associated with an increased risk for cardiovascular events and all-cause mortality, age- and sex-adjusted HRs (95% CIs) 3.22 (2.17–4.79) and 1.61 (1.17–2.23), respectively. In further models with adjustment for cardiovascular risk factors, NT-proBNP remained independently associated with outcome.ConclusionNT-proBNP levels are elevated in patients with DTC, and are associated with an increased risk for cardiovascular events and all-cause mortality. Determination of NT-proBNP may identify DTC patients at increased cardiovascular risk, who could benefit from more stringent cardiovascular risk surveillance.
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