Alveolar size effects on nanoparticle deposition in rhythmically expanding-contracting terminal alveolar models
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UMass Chan Affiliations
Department of RadiologyDocument Type
Journal ArticlePublication Date
2020-06-01Keywords
AllometryAlveolar size
Interalveolar septa
Nanoparticle alveolar deposition
Pulmonary acinus
Rhythmic wall motion
Biomedical Engineering and Bioengineering
Investigative Techniques
Nanotechnology
Respiratory System
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Show full item recordAbstract
Significant differences in alveolar size exist in humans of different ages, gender, health, and among different species. The effects of alveolar sizes, as well as the accompanying breathing frequencies, on regional and local dosimetry of inhaled nanoparticles have not been sufficiently studied. Despite a well-accepted qualitative understanding of the advection-diffusion-sedimentation mechanism in the acinar region, a quantitative picture of the interactions among these factors remains inchoate. The objective of this study is to quantify the effects of alveolar size on the regional and local deposition of inhaled nanoparticles in alveolar models of varying complexities and to understand the dynamic interactions among different deposition mechanisms. Three different models were considered that retained 1, 4, and 45 alveoli, respectively. For each model, the baseline geometry was scaled by (1/4), (1/2), 2, 4, and 8 times by volume. Temporal evolution and spatial distribution of particle deposition were tracked using a discrete-phase Lagrangian model. Lower retentions of inhaled nanoparticles were observed in the larger alveoli under the same respiration frequency, while similar retentions were found among different geometrical scales if breathing frequencies allometrically matched the alveolar size. Dimensional analysis reveals a manifold deposition mechanism with tantamount contributions from advection, diffusion, and gravitational sedimentation, each of which can become dominant depending on the location in the alveoli. Results of this study indicate that empirical correlations obtained from one sub-population cannot be directly applied to others, nor can they be simply scaled as a function of the alveolar size or respiration frequency due to the regime-transiting deposition mechanism that is both localized and dynamic.Source
Xi J, Talaat M, Si XA, Han P, Dong H, Zheng S. Alveolar size effects on nanoparticle deposition in rhythmically expanding-contracting terminal alveolar models. Comput Biol Med. 2020 Jun;121:103791. doi: 10.1016/j.compbiomed.2020.103791. Epub 2020 May 4. PMID: 32568674. Link to article on publisher's site
DOI
10.1016/j.compbiomed.2020.103791Permanent Link to this Item
http://hdl.handle.net/20.500.14038/29488PubMed ID
32568674Related Resources
ae974a485f413a2113503eed53cd6c53
10.1016/j.compbiomed.2020.103791