NPPB and hydrops fetalis: The E/E’ ratio and N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels significantly correlate with the presence of B-lines on lung ultrasound [34,35], and were identified as independent predictors of cardiac death or hospitalization for worsening HF during a short follow-up in a cohort of patients admitted for acute or decompensated chronic HF (E/E’ ratio Hazard Ratio 1.047, 95% C.I. 1.006–1.090, p = 0.025; NT-proBNP HR 3.751, 95% C.I. 1.834 –7.767, p < 0.0001) [29].