This chapter describes the effects that respiratory disease has on particle deposition in the lungs. The geometry of airways, breathing patterns, and regional ventilation are all affected by various lung diseases, including COPD, asthma, and cystic fibrosis, and in turn modify total and regional deposition from normal. Total particle deposition in the lung is increased by airways obstruction and increased ventilation at rest compared to healthy individuals. Regional particle deposition is 1) shifted from distal to more proximal bronchial airways by airway obstruction, and 2) becomes more heterogeneous due to uneven lung ventilation. The net effect of the changes in total and regional particle deposition from normal is to greatly enhance bronchial airway surface doses for particle deposition while leaving unventilated lung regions inaccessible to the particles. As a result, both therapeutic aerosol delivery and the adverse effects of pollutant particles may be altered with progression of lung disease.
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