title: Failure of oral propranolol to maintain relief from paroxysmal syncopal attacks in Fallot's tetralogy after its successful intravenous use.
mesh_terms: D006348:Cardiac Surgical Procedures; D003490:Cyanosis / Q000188:drug therapy; D004417:Dyspnea / Q000188:drug therapy; D006801:Humans; D007223:Infant; D007275:Injections, Intravenous; D010701:Phonocardiography; D011433:Propranolol / Q000008:administration & dosage* / Q000627:therapeutic use*; D013575:Syncope; D013771:Tetralogy of Fallot / Q000150:complications*
chemical_list: D011433:Propranolol