title: [The clinical study of hyponatremia in the elderly. The incidence and the characterization of hyponatremia with unknown etiology (author's transl)].
mesh_terms: D000368:Aged; D001794:Blood Pressure; D006801:Humans; D007010:Hyponatremia / Q000145:classification* / Q000209:etiology / Q000503:physiopathology; D010953:Plasma Volume; D012083:Renin / Q000097:blood; D012964:Sodium / Q000652:urine
chemical_list: D012964:Sodium; D012083:Renin