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Modeling the dynamics of airway constriction : effects of agonist transport and binding

Amin, Samir D. and Majumdar, Arnab and Frey, Urs and Suki, Béla. (2010) Modeling the dynamics of airway constriction : effects of agonist transport and binding. Journal of applied physiology, Vol. 109, no. 2. pp. 553-563.

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Official URL: http://edoc.unibas.ch/dok/A6003806

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Abstract

Recent advances have revealed that during exogenous airway challenge, airway diameters cannot be adequately predicted by their initial diameters. Furthermore, airway diameters can also vary greatly in time on scales shorter than a breath. To better understand these phenomena, we developed a multiscale model that allowed us to simulate aerosol challenge in the airways during ventilation. The model incorporates agonist-receptor binding kinetics to govern the temporal response of airway smooth muscle contraction on individual airway segments, which, together with airway wall mechanics, determines local airway caliber. Global agonist transport and deposition are coupled with pressure-driven flow, linking local airway constrictions with global flow dynamics. During the course of challenge, airway constriction alters the flow pattern, redistributing the agonist to less constricted regions. This results in a negative feedback that may be a protective property of the normal lung. As a consequence, repetitive challenge can cause spatial constriction patterns to evolve in time, resulting in a loss of predictability of airway diameters. Additionally, the model offers new insights into several phenomena including the intra- and interbreath dynamics of airway constriction throughout the tree structure.
Faculties and Departments:03 Faculty of Medicine > Bereich Kinder- und Jugendheilkunde (Klinik) > Kinder- und Jugendheilkunde (UKBB) > Pädiatrie (Frey)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Kinder- und Jugendheilkunde (Klinik) > Kinder- und Jugendheilkunde (UKBB) > Pädiatrie (Frey)
UniBasel Contributors:Frey, Urs Peter
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physiological Society
ISSN:0161-7567
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:07 Dec 2012 13:04
Deposited On:07 Dec 2012 13:03

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