Figure 1. NYHA class, NTproBNP, and mortality after surgical aortic valve replacement.
Kaplan-Meier curves are shown based on NYHA class (a), raw level of NTproBNP (b), and modified level of NTproBNP (c) for patients treated with surgical aortic valve replacement. The modified level of NTproBNP accounted for the influence of age, sex, body mass index, and renal function on NTproBNP levels.