title: Preoperative beta blockade for PDA ligation.
mesh_terms: D000293:Adolescent; D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D004374:Ductus Arteriosus, Patent / Q000601:surgery*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011300:Preoperative Care; D011433:Propranolol / Q000627:therapeutic use*; D011446:Prospective Studies
chemical_list: D000319:Adrenergic beta-Antagonists; D011433:Propranolol