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• W2271581011 abstract "Triamcinolone acetonide (TAA) is an anti-inflammatory steroid used for topical treatment of allergic rhinitis and asthma. Drug deposition onto target tissues is an important parameter, so methods for accurate deposition measurement are needed. Lung deposition is especially problematic to measure because of the large field of view and low relative drug penetration. Our main objective was to use PET to measure the deposition and postdeposition kinetics of TAA in the lung after administration from the Azmacort inhaler. The second objective was to evaluate changes in distribution caused by the inhalation spacer that is built into the product.11C-labeled TAA was formulated as the Azmacort product, 5 healthy volunteers inhaled it, and PET scans were obtained of its distribution in the head and chest. Region-of-interest analysis with CT overlay was used to analyze the distribution and kinetics in the airway and lung.From 10% to 15% of the inhaled drug dose was deposited in target airway regions in a distally decreasing pattern. Deposition in the oral cavity was about 30% of the dose. Slow absorption or clearance of drug from target tissues was observed over time. Use of the inhalation spacer caused statistically significant increases in all target tissues (factor of 2-5) and a roughly 40% decrease in oral deposition. Measurable amounts of the drug remained in target regions throughout the scanning period.Local pulmonary distribution and kinetics of inhaled drugs can be measured accurately by PET for drug development. The integrated actuator-spacer significantly enhanced deposition of TAA in target tissues and reduced deposition in the oropharyngeal region." @default.
• W2271581011 created "2016-06-24" @default.
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• W2271581011 date "2000-10-01" @default.
• W2271581011 modified "2023-10-18" @default.
• W2271581011 title "Pulmonary distribution and kinetics of inhaled [11C]triamcinolone acetonide." @default.
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