NPPB and hydrops fetalis: According to the guidelines of the European Society of Cardiology (ESC) and American College of Cardiology Foundation/American Heart Association (ACCF/AHA), the biomarker B-type natriuretic peptide (BNP) is the most reliable tool for diagnosing HF, establishing prognosis or disease severity, and guiding treatment planning by indicating the need for treatment intensification [6, 7].