Chronic bronchitis alters the pattern of aerosol deposition in the lung
| Autor: | William A. Skornik, John J. Godleski, Joseph D. Brain, Victoria Hatch, T. D. Sweeney |
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| Rok vydání: | 1995 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Atmosphere Exposure Chambers Chronic bronchitis Pathology medicine.medical_specialty Critical Care and Intensive Care Medicine Rats Sprague-Dawley Oxygen Consumption Pharmacokinetics medicine Animals Lung volumes Bronchitis Lung Aerosols Inhalation business.industry Respiratory disease medicine.disease Rats medicine.anatomical_structure Chronic Disease Room air distribution Autoradiography business |
| Zdroj: | American Journal of Respiratory and Critical Care Medicine. 151:482-488 |
| ISSN: | 1535-4970 1073-449X |
| DOI: | 10.1164/ajrccm.151.2.7842210 |
| Popis: | Knowledge of the local and regional doses of inhaled particulates is crucial for inhalation therapy and for understanding the progression of pulmonary disease. We studied the deposition pattern of radioactively tagged particles in rats with chronic bronchitis. Rats were exposed to sulfur dioxide (SO2; 236 +/- 14 ppm) for 5 h/d, 5 d/wk for 7 wk to produce chronic bronchitis (CB). Control rats were exposed to room air. The control animals gained 85% more weight over the 7-wk period than did the CB rats. Five control and five CB rats were then exposed for 30 min to an insoluble 99mTc-labeled aerosol. The animals were killed within 5 min after the exposure period. The lungs were excised, dried at total lung capacity (TLC), and sliced into 1 mm sections. The distribution of the radiolabeled particles retained in the lungs was determined in two ways. First, autoradiographs were made of the distribution of the radioactivity throughout a lung slice. Autoradiographs were quantified by image analysis to determine the amount of radioactivity (relative density of the film) associated with airway versus parenchyma (ratio of airway to parenchyma density). The lung slices were then dissected into pieces, the weight and radioactivity content of each piece was measured, and its evenness index (EI) was calculated. This type of analysis enables the homogeneity of particle deposition throughout the lungs to be assessed. If deposition were totally uniform, the average EI would be 1.0 with an SD = 0. The total amount of radioactivity retained in the lungs was similar in control and CB rats.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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