title: Cardiac response to repeated doses of isoproterenol aerosol.
abstract: We studied 18 patients with moderate to severe asthma for cardiac response to repeated doses of isoproterenol aerosol. In only 1 patient was there a significant increase in heart rate immediately after inhalation of isoproterenol aerosol, and it lasted only for 1 minute. In 2 patients increased heart rate was either due to breathholding or to the propellant in the aerosol. There was no cumulative effect on heart rate. Arrhythmias did not develop at any time despite repeated doses of aerosol every 5 to 20 minutes. Peak expiratory flow rate increased 5 minutes after the first dose, and it increased even further after repeated doses; at no time did it decrease after repeated doses.
mesh_terms: D000293:Adolescent; D000328:Adult; D000336:Aerosols; D000368:Aged; D001249:Asthma / Q000188:drug therapy; D002986:Clinical Trials as Topic; D004334:Drug Administration Schedule; D005260:Female; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D007545:Isoproterenol / Q000008:administration & dosage* / Q000506:poisoning / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010366:Peak Expiratory Flow Rate; D010919:Placebos
chemical_list: D000336:Aerosols; D010919:Placebos; D007545:Isoproterenol