Prognostic value of soluble ST2 biomarker in heart failure patients with reduced ejection fraction – A multicenter study

OBJECTIVE: To study the prognostic value of soluble Suppression of Tumorigenicity-2 (sST2) in heart failure patients with reduced ejection fraction (HFrEF). METHODS: In this prospective, observational, multicenter study, patients with heart failure (HF) and left ventricular ejection fraction (LVEF) <50% were included. Clinical evaluation and serum levels of sST2 were estimated at five time points during follow up. Study endpoint was the relationship of baseline and serial sST2 concentration in the blood to the composite endpoints of cardiac death and re-hospitalization for worsening of HF during one year follow up period. RESULTS: A total of 141 patients were enrolled. The mean age was 60 ± 10.4 years. At baseline evaluation, 49.6% patients were in New York Heart Association (NYHA) class III and 36.2% in class IV. Adverse events were observed in 57 patients (40.4%); 25 (17.7%) were re-hospitalized due to worsening of HF and 32 (22.7%) died due to cardiac causes. The median value of baseline sST2 was 46.36 ng/ml (IQR 31.30–78.38). sST2 concentration at baseline was significantly higher among patients with adverse events in comparison to patients without adverse events (p = <0.001). Receiver operating characteristic curve (ROC) for baseline sST2 concentration identified 49 ng/ml as optimal cut-off value to predict cardiac death and re-hospitalization, with a sensitivity and specificity of 72% and 75%, respectively. CONCLUSION: In patients with HFrEF, sST2 concentration at baseline as well as on serial testing was significantly correlated with cardiac death and re-hospitalization for worsening of HF.