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Assessment of elastase-induced structural and functional changes in sheep lungs
Bulletin Europeen De Physiopathologie Respiratoire
|March 1, 1985
Summary
This study developed a sheep model of emphysema using elastase to assess lung injury. Radionuclide imaging reliably detected dose-dependent changes in lung perfusion and ventilation, correlating with structural damage.
Area of Science:
- Pulmonary Medicine
- Animal Models
- Medical Imaging
Background:
- Emphysema research requires reliable models to study lung structure and function.
- Elastase-induced emphysema provides a method to mimic human disease in animal subjects.
- Assessing lung injury non-invasively is crucial for understanding disease progression.
Purpose of the Study:
- To develop and validate a large-animal model of elastase-induced emphysema in sheep.
- To evaluate the correlation between elastase dosage and changes in lung structure and function.
- To assess the utility of radionuclide imaging for detecting pulmonary injury.
Main Methods:
- Intrabronchial instillation of varying elastase doses into sheep lungs.
- In vivo radionuclide imaging (Tc-99m MAA, Kr-81m, Xe-127) to measure regional perfusion (Q) and ventilation (V).
- Histological examination of lung tissue post mortem to assess alveolar mean linear intercept (Lm).
Main Results:
- A significant positive correlation was found between elastase dose and reduced lung perfusion (Q).
- Decreased Q correlated significantly with increased alveolar mean linear intercept (Lm), indicating structural damage.
- Ventilation (V) changes showed a trend with elastase dose and Lm but did not reach statistical significance.
Conclusions:
- Computer analysis of regional Q and V using radionuclide imaging is a sensitive and non-invasive method.
- This sheep model effectively assesses elastase-induced pulmonary injury.
- Radionuclide imaging can reliably detect and quantify lung damage in emphysema models.