In certain aspects, the present disclosure relates to methods of treating, preventing, and reducing the severity or progression of heart failure or one or more complications of heart failure. For example, the disclosure provides various BMP antagonists, such as ActRIIA polypeptides, ActRIIB polypeptides, BMPRII polypeptides, ALKI polypeptides, endoglin polypeptides, BMP 10 propeptide proteins and Fc fusion proteins thereof as well as anti-BMP9 antibodies, for treating, preventing and reducing the severity or progression of heart failure or one or more complications of heart failure.