NPPB and heart failure: We compare the number of zones with B-lines by LUS (range 0–16) in the 50 patients with heart failure with E/e′ ≥ 15 as reference for decompensation, EF ≤ 30 as reference for severe heart failure, and with pro-B-type natriuretic peptide (proBNP) ≥ 450 pg/mL as reference for decompensated heart failure.