Early airway structural changes in cystic fibrosis pigs as a determinant of particle distribution and deposition

Maged Awadalla, S Miyawaki, MH Abou Alaiwa, RJ Adam, DC Bouzek, AS Michalski, MK Fuld, Karen Reynolds, EA Hoffman, CL Lin, DA Stoltz

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    The pathogenesis of cystic fibrosis (CF) airway disease is not well understood. A porcine CF model was recently generated, and these animals develop lung disease similar to humans with CF. At birth, before infection and inflammation, CF pigs have airways that are irregularly shaped and have a reduced caliber compared to non-CF pigs. We hypothesized that these airway structural abnormalities affect airflow patterns and particle distribution. To test this hypothesis we used computational fluid dynamics (CFD) on airway geometries obtained by computed tomography of newborn non-CF and CF pigs. For the same flow rate, newborn CF pig airways exhibited higher air velocity and resistance compared to non-CF. Moreover we found that, at the carina bifurcation, particles greater than 5-lm preferably distributed to the right CF lung despite almost equal airflow ventilation in non-CF and CF. CFD modeling also predicted that deposition efficiency was greater in CF compared to non-CF for 5- and 10-lm particles. These differences were most significant in the airways included in the geometry supplying the right caudal, right accessory, left caudal, and left cranial lobes. The irregular particle distribution and increased deposition in newborn CF pig airways suggest that early airway structural abnormalities might contribute to CF disease pathogenesis.

    Original languageEnglish
    Pages (from-to)915-927
    Number of pages13
    JournalAnnals of Biomedical Engineering
    Volume42
    Issue number4
    DOIs
    Publication statusPublished - Apr 2014

    Keywords

    • Airway narrowing
    • Computational fluid dynamics
    • Porcine

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