title: Pharmacological treatment of chronic systolic heart failure: are we scraping the bottom of the barrel?
authors.forename: Giovanni M
authors.initials: GM
authors.lastname: Boffa
mesh_terms: D054143:Heart Failure, Systolic / Q000188:drug therapy*; D006801:Humans; D058986:Phosphodiesterase 5 Inhibitors / Q000627:therapeutic use*; D010879:Piperazines / Q000627:therapeutic use*; D011687:Purines / Q000627:therapeutic use; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000627:therapeutic use*
chemical_list: D058986:Phosphodiesterase 5 Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate