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The effects of formulation parameters on the product performance characteristics of solution metered dose inhalers (MDIs) were determined using ethanol as the cosolvent and HFA 134a as the propellant. Solubility of beclomethasone dipropionate (BDP) was determined in various blends of 134a and...
The purpose of this study was to define nebulization conditions providing delivery of aerosols of EPI-hNE4, an inhibitor of human neutrophil elastase (HNE). EPI-hNE4 was nebulized with Pari LC Star ® and tested at three concentrations (2.5, 5, and 10 mg/mL). The inhaled mass was measured over 15...
We used a gamma camera to monitor the retention and clearance of radiolabeled human serum albumin (HSA), a water-soluble material with molecular weight of 66,000 Daltons, and radiolabeled sulfur colloid (SC), an insoluble submicron (0.22 μ m) particle, following localized deposition in a 4-5-mm...
We have used high-resolution three-dimensional magnetic resonance imaging (MRI) to measure the surface area, volume, and length of the nasal cavities of cynomolgus monkeys (10 male, six female) over a range of body weights (1.9-5.3 kg, mean 2.9 kg) and ages (8-45 months, mean 30.0 months). The...
Turbuhaler and Salbutamol-Diskus produce therapeutic doses at peak inspiratory flow (PIF) of >30 L/min. However, the optimum flow for Fluticasone-Diskus and Turbuhaler, in terms of total emitted dose and fine particle mass, is >60 L/min. The Turbuhaler achieved a higher output at this flow, as...
Inhaled recombinant human deoxyribonuclease (rhDNase) delivered by nebulizer improves pulmonary function and reduces the rate of pulmonary exacerbations in cystic fibrosis subjects. Standard jet nebulizers are relatively inefficient and require a delivery time of 10-20 min. We conducted an...
The ability of the Model 3320 and newer Model 3321 Aerodynamic Particle Sizer ® Spectrometer (APS) to make accurate mass-weighted size distribution measurements of solution metered dose inhalers (MDIs) was evaluated. Measurements of experimental HFA-134a beclomethasone dipropionate MDIs were...
The aerosol-derived airway morphometry technique (ADAM) can be used to assess non-invasively peripheral airspace dimensions. It has been shown that this technique can identify permanent peripheral airspace enlargement in patients with lung emphysema, but it is yet unknown if early stages of...
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