Changes in N-terminal pro-B-type natriuretic peptide levels and outcomes in heart failure with preserved ejection fraction: an analysis of the I-Preserve study.

Aims In patients with heart failure ( HF) and reduced ejection fraction, decreases or increases in NT-proBNP levels are associated with better and worse outcomes, respectively. The association in HF and preserved ejection fraction ( HF-PEF) is unknown. We examined the association between change in level of NT-proBNP and prognosis in patients with HF-PEF. Methods and results We examined the association between change in NT-proBNP from baseline to 6 months and cardiovascular ( CV) death or HF hospitalization in 2612 participants in the Irbesartan in Patients with Heart Failure and Preserved Systolic Function Study (I-Preserve). Change in NT-proBNP was modelled as a restricted cubic spline in a Cox model after adjusting for baseline NT-proBNP and known prognostic variables. Median change in NT-proBNP from baseline was −7 pg/ mL (interquartile range −143 to +108). After adjustment, a 1000 pg/ mL decrease in NT-proBNP from baseline was associated with a reduction in the risk of CV death or HF hospitalization [hazard ratio ( HR) 0.73, 95% confidence interval ( CI) 0.53-1.02]; a 1000 pg/ mL increase was associated with an increase in risk ( HR 2.01, 95% CI 1.50-2.69). Beyond a 1000 pg/ mL rise or fall, there was little additional change in risk. Addition of change in NT-proBNP at 6 months to a model with only baseline NT-proBNP improved the C-statistic from 0.752 to 0.769 ( P = 0.013). Conclusion In HF-PEF, a rise in NT-proBNP was associated with an increase in risk of CV death or HF hospitalization and a fall was associated with a trend towards a decrease in risk. NT-proBNP may be a useful marker to monitor prognosis in this condition. [ABSTRACT FROM AUTHOR]