title: A dose response study comparing Duovent vs salbutamol.
abstract: The dose response profiles of Duovent (fenoterol 0.1 mg/ipratropium 0.04 mg per puff) and salbutamol (0.1 mg per puff) were determined in a double-blind, controlled study. Twenty-one patients with asthma and nine patients with chronic bronchitis received 1, 2, 4, and 6 puffs of either Duovent or salbutamol on separate days. FEV1, pulse and tremor were recorded at baseline and up to 360 minutes after inhalation of test medication. Duovent and salbutamol produced an effective bronchodilator response at all dose levels, however, at 2, 4 and 6 puffs, the improvement with Duovent was significantly greater than with salbutamol alone in both asthmatic and chronic bronchitic patients. Two puffs of Duovent produced a significantly greater bronchodilation than all doses of salbutamol. There was no difference in the bronchodilator response between 1-6 puffs of salbutamol indicating maximal dose was achieved with one puff. There was an incremental improvement in FEV1 with 1, 2, and 4 puffs of Duovent but no difference between 4 and 6 puffs. There was no difference in pulse rate or tremor between salbutamol or Duovent at any dose level. We conclude that Duovent produces a greater and more prolonged bronchodilator response than salbutamol in both asthmatic and chronic bronchitic patients.
authors.affiliation: Princess Margaret Hospital, Christchurch.
authors.forename: D E
authors.initials: DE
authors.lastname: Stewart
authors.forename: A J
authors.initials: AJ
authors.lastname: Gillies
mesh_terms: D000328:Adult; D000336:Aerosols; D000420:Albuterol / Q000009:adverse effects / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D001286:Atropine Derivatives / Q000627:therapeutic use*; D001991:Bronchitis / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000009:adverse effects / Q000627:therapeutic use*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004338:Drug Combinations / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D005260:Female; D005280:Fenoterol / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D009241:Ipratropium / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D011897:Random Allocation
chemical_list: D000336:Aerosols; D001286:Atropine Derivatives; D001993:Bronchodilator Agents; D004338:Drug Combinations; C030809:fenoterol, ipratropium drug combination; D005280:Fenoterol; D009241:Ipratropium; D000420:Albuterol