Lung delivery of salbutamol by dry powder inhaler (Turbuhaler) and small volume antistatic metal spacer (Airomir CFC-free MDI plus NebuChamber)

As a worldwide ban on the use of chlorofluorocarbons (CFCs) in inhaler devices approaches, considerable attention has been focused on the production of CFC-free delivery devices. The aim of our study was to compare the delivery of salbutamol by dry powder inhaler (DPI), Turbuhaler and a CFC-free metered-dose inhaler (MDI), Airomir, used with a novel small volume metal spacer (NebuChamber). Ten healthy volunteers, mean (SEM) age 21 (0.7) yrs were studied in a randomized, single (investigator)-blind cross-over design. Single doses of 1,200 microg salbutamol, from Turbuhaler DPI and Airomir CFC-free MDI via a NebuChamber, were given as 12 sequential 100 microg inhalations over 6 min. The lung delivery of salbutamol was assessed by measuring the plasma salbutamol profile over the first 20 min after inhalation. Plasma salbutamol concentration was expressed as maximal (Cmax) and average (Cav) value. Significant differences (p<0.001) were found between the NebuChamber (N) and the Turbuhaler (T) for salbutamol Cmax and Cav. This amounted to a 1.89 fold difference (95% CI 1.56-2.22) between these devices for Cmax, and a 1.78 fold difference (95% CI 1.42-2.15) for Cav. We have demonstrated that, in vivo, salbutamol from a chlorofluorocarbon-free metered-dose inhaler given via a small volume metal spacer (NebuChamber) produces significantly greater delivery than from an efficient dry powder inhaler (Turbuhaler).

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				S. J FOWLER and B. J LIPWORTH Therapeutic equivalence of inhaled salbutamol Thorax, April 1, 2000; 55(4): 345e - 345. [Full Text]