Emphysema is a pulmonary disease that may be exacerbated by inhaled particles. Over the years, many animal models of emphysema have been developed that may be useful in studying the effects of inhaled particles on humans with emphysema. Models have been described in many species, and many approaches have been described for inducing emphysema. Emphysema in humans is a parenchymal component of chronic obstructive pulmonary disease and frequently coexists in a complex with disease of the airways such as bronchitis. Animal models of emphysema usually recapitulate only one or a few aspects of this complex disease. Thus, the emphysema model must be selected carefully in order to answer specific questions about the interactive effects of particles and emphysema.
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