title: Letter: Cardiac failure.
mesh_terms: D006333:Heart Failure / Q000188:drug therapy*; D006801:Humans; D007548:Isosorbide Dinitrate / Q000627:therapeutic use; D009573:Nitrites / Q000627:therapeutic use; D005996:Nitroglycerin / Q000627:therapeutic use
chemical_list: D009573:Nitrites; D005996:Nitroglycerin; D007548:Isosorbide Dinitrate