Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Rausch, S M K; Haberthür, D; Stampanoni, M; Schittny, J C; Wall, W A (2011). Local strain distribution in real three-dimensional alveolar geometries. Annals of Biomedical Engineering, 39(11):2835-2843.

Full text not available from this repository.

Abstract

Mechanical ventilation is not only a life saving treatment but can also cause negative side effects. One of the main complications is inflammation caused by overstretching of the alveolar tissue. Previously, studies investigated either global strains or looked into which states lead to inflammatory reactions in cell cultures. However, the connection between the global deformation, of a tissue strip or the whole organ, and the strains reaching the single cells lining the alveolar walls is unknown and respective studies are still missing. The main reason for this is most likely the complex, sponge-like alveolar geometry, whose three-dimensional details have been unknown until recently. Utilizing synchrotron-based X-ray tomographic microscopy, we were able to generate real and detailed three-dimensional alveolar geometries on which we have performed finite-element simulations. This allowed us to determine, for the first time, a three-dimensional strain state within the alveolar wall. Briefly, precision-cut lung slices, prepared from isolated rat lungs, were scanned and segmented to provide a three-dimensional geometry. This was then discretized using newly developed tetrahedral elements. The main conclusions of this study are that the local strain in the alveolar wall can reach a multiple of the value of the global strain, for our simulations up to four times as high and that thin structures obviously cause hotspots that are especially at risk of overstretching.

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Biomedical Engineering
DDC:170 Ethics
610 Medicine & health
Language:English
Date:2011
Deposited On:28 Jan 2012 19:53
Last Modified:27 Nov 2013 20:34
Publisher:Springer
ISSN:0090-6964
Publisher DOI:10.1007/s10439-011-0328-z
PubMed ID:1607757
Citations:Web of Science®. Times Cited: 11
Google Scholar™
Scopus®. Citation Count: 11

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page