FGF23 and familial dilated cardiomyopathy: The main findings of this study are that (1) plasma levels of FGF-23 are higher in patients with PH, LVH, and DCM than in healthy controls, whereas no significant differences were found between patients with PH, LVH, and DCM; (2) increased FGF-23 plasma levels are associated with systolic RV dysfunction, RV dilation, lower CI, and higher pulmonary pressure and vascular resistance in PH patients; (3) FGF-23 is an eGFR-independent predictor of RV maladaptation.