Journal of aerosol medicine and pulmonary drug delivery
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J Aerosol Med Pulm Drug Deliv · Aug 2014
Randomized Controlled Trial Multicenter Study Comparative StudyPharmacokinetics and pharmacodynamics of fluticasone propionate and salmeterol delivered as a combination dry powder from a capsule-based inhaler and a multidose inhaler in asthma and COPD patients.
The object of this study was to assess whether a capsule-based and multidose dry powder inhaler containing salmeterol (as xinafoate salt) 50 μg plus fluticasone propionate (FP) 250 μg [combination (SFC 50/250)] could be equivalent in terms of in vivo drug delivery and systemic exposure. ⋯ The in vitro tests and systemic pharmacodynamic endpoints revealed no major differences between the two inhalers, but lacked predictive power and sensitivity to guide in vivo drug delivery performance and systemic exposure. Based on pharmacokinetic endpoints, the inhalers were not considered bioequivalent in terms of systemic exposure. Further studies to refine the Rotahaler performance are ongoing.
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J Aerosol Med Pulm Drug Deliv · Aug 2014
Comparative StudyMethodology for the in vitro evaluation of the delivery efficiency from valved holding chambers with facemasks.
In vitro performance studies of valved holding chamber (VHC)-facemask systems are a cost-effective means of circumventing potentially confounding clinical variables. This article reports results of an in vitro investigation into VHC-facemask performance, using three age-specific soft anatomical model (SAM) faces, under clinically relevant conditions. ⋯ This study describes a potentially standardized method for the evaluation of VHC-facemask systems. Use of this method enabled a comprehensive investigation into the influence of clinically relevant variables, including age-specific facial anatomy, number of simulated breaths, and seal leakage, on the delivery efficiency of several commercially available VHC-facemask systems.
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J Aerosol Med Pulm Drug Deliv · Aug 2014
Randomized Controlled Trial Comparative StudyLung deposition of 99mTc-radiolabeled albuterol delivered through a pressurized metered dose inhaler and spacer with facemask or mouthpiece in children with asthma.
Research on the use of a pressurized metered dose inhaler (pMDI) with spacer (pMDI/spacer) in children has indicated oral inhalation via the spacer mouthpiece is more efficient than the combination of oral and nasal inhalation that occurs when a pMDI/spacer is used with a facemask. Changes in pMDI formulations and developments in spacer and facemask designs have highlighted the need for new comparative studies of spacer use, particularly focusing on the age at which children can be taught to transition from use of a pMDI/spacer with facemask to use of the spacer mouthpiece. ⋯ Lung deposition achieved using the spacer with facemask was higher than previously reported, with a difference of only 4.4% of total dose measured compared to the deposition with mouthpiece. This may be due to a combination of factors including pMDI formulation, and use of an antistatic spacer with a flexible, well-fitting facemask.
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J Aerosol Med Pulm Drug Deliv · Aug 2014
Randomized Controlled Trial Comparative StudyNebulized tobramycin in the treatment of adult CF pulmonary exacerbations.
Repeated courses of intravenous (IV) aminoglycosides in cystic fibrosis (CF) patients are associated with cumulative nephrotoxicity. Targeting their delivery through the inhaled route during acute pulmonary exacerbations may also be effective, but without systemic side effects. ⋯ TNS is effective in treating acute exacerbations of Psa in CF patients, but with a renal sparing potential compared with the IV preparation.
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J Aerosol Med Pulm Drug Deliv · Aug 2014
Comparative StudyIn vitro characterization of the OptiChamber Diamond valved holding chamber.
Use of a valved holding chamber (VHC) in conjunction with a pressurized metered dose inhaler (pMDI) can reduce issues relating to poor actuation-inhalation coordination and potentially improve the lung deposition of aerosol, compared with use of a pMDI alone. However, the performance of a VHC is influenced by different device-related factors, including the size and shape of the VHC and the material it is manufactured from (conventional versus antistatic). This study aimed to provide an in vitro characterization of an antistatic VHC, the OptiChamber Diamond VHC, comparing the aerodynamic particle size distribution of aerosol delivered via this VHC with results from a second antistatic VHC and a conventional VHC. ⋯ The two antistatic VHCs were equivalent for both pMDI brands. Aerosol delivered from the antistatic VHCs at 15 L/min had a higher proportion of fine particles compared with the conventional VHC.