NPPB and heart failure: RA function exhibited correlations with heart failure parameters in EA patients (see Table 2): 1) atrial reservoir function correlated significantly with BNP level (RA εs and SRs) and NYHA class (p < 0.05 for RA εs; and a strong trend for RA SRs, p = 0.067); 2) atrial conduit function (RA εe and SRe) correlated with the R/L-Volume Index; and 3) atrial booster pump function (RA εa and SRa) correlated with NYHA class and BNP (see Table 2).