Lung deposition of 99mTc-radiolabeled albuterol delivered through a pressurized metered dose inhaler and spacer with facemask or mouthpiece in children with asthma.

Background: 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.

Methods: Twelve children aged 3-5 years (7 males) with stable asthma were recruited.

Aerosol delivery of nebulised budesonide in young children with asthma.

Background: Lung deposition of inhaled steroids, likely to be of benefit in the anti-inflammatory treatment of asthma in young children, is low. This is explained by age specific anatomical and physiological characteristics as well as poor cooperation with aerosol therapy. However, total lung deposition and the ratio of lung deposition to oropharyngeal deposition are key determinants of clinical efficacy and of systemic side effects of aerosolized drugs.

In vitro validation of 99mTc-HFA-FP delivered via pMDI-spacer.

The purpose of the study was to label Flixotide (fluticasone propionate [FP] with HFA propellant), with technetium-99m and validate that (99m)Tc acts as a suitable marker for FP when delivered via pMDI-spacer. Sodium pertechnetate was mixed with 5 mL of butanone. (99m)Tc was extracted into butanone and transferred into an empty canister.

A complementary combination of delivery device and drug formulation for inhalation therapy in preschool children.

The amount of drug delivered from commercially available inhalation devices which reaches the lungs of preschool children is generally low. We therefore studied the efficiency of lung delivery from an optimised combination of delivery device and drug formulation based on individual patient-related factors. In six three-year-old children we compared the delivery of a radiolabelled budesonide solution with a MMD of 4.

Membrane-bound orientation and position of the synaptotagmin I C2A domain by site-directed spin labeling.

Site-directed spin labeling was used to determine the membrane orientation and insertion of the C2A domain from synaptotagmin I. A series of single cysteine mutants of the C2A domain of synaptotagmin I was prepared and labeled with a sulfhydryl specific spin label. Upon Ca2+ or membrane binding, the EPR line shapes of these mutants reveal dramatic decreases in label mobility within the Ca2+-binding loops.