title: Comparison of effects of propranolol and metoprolol on airways obstruction in chronic bronchitis.
mesh_terms: D000402:Airway Obstruction / Q000188:drug therapy*; D001991:Bronchitis / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005541:Forced Expiratory Volume; D006801:Humans; D007545:Isoproterenol / Q000627:therapeutic use; D008790:Metoprolol / Q000627:therapeutic use*; D008875:Middle Aged; D011412:Propanolamines / Q000627:therapeutic use*; D011433:Propranolol / Q000627:therapeutic use*; D011897:Random Allocation; D014797:Vital Capacity
chemical_list: D011412:Propanolamines; D011433:Propranolol; D008790:Metoprolol; D007545:Isoproterenol