NPPB and hydrops fetalis: Based on the results from our study, we can conclude that there is a statistically significant relationship between increased values of MPV (over 9 fl) and biological (increased NT-proBNP, increased RDW), electrocardiographic (presence of AFib rhythm), and echocardiographic variables (reduced LVEF, dilated LV, dilated LA, presence of PH) in the studied population of patients with HF.