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Experimental Mechanics
Erschienen in: Experimental Mechanics 1/2021

07.01.2021 | Sp Iss: Experimental Advances in Cardiovascular Biomechanics

Ex Vivo Regional Mechanical Characterization of Porcine Pulmonary Arteries

verfasst von: N.R. Pillalamarri, S.S. Patnaik, S. Piskin, P. Gueldner, E.A. Finol

Erschienen in: Experimental Mechanics | Ausgabe 1/2021

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Abstract

Background

Regional mechanical characterization of pulmonary arteries can be useful in the development of computational models of pulmonary arterial mechanics.

Objective

We performed a biomechanical and microstructural characterization study of porcine pulmonary arteries, inclusive of the main, left, and right pulmonary arteries (MPA, LPA, and RPA, respectively).

Methods

The specimens were initially stored at −20 °C and allowed to thaw for 12–24 h prior to testing. Each artery was further subdivided into proximal, middle, and distal regions, leading to ten location-based experimental groups. Planar equibiaxial tensile testing was performed to evaluate the mechanical behavior of the specimens, from which we calculated the stress at the maximum strain (S55), tensile modulus (TM), anisotropy index (AI), and strain energy in terms of area under the stress-strain curve (AUC). Histological quantification was performed to evaluate the area fraction of elastin and collagen content, intima-media thickness (IMT), and adventitial thickness (AT). The constitutive material behavior of each group was represented by a five-constant Holzapfel-Gasser-Ogden model.

Results

The specimens exhibited non-linear stress-strain characteristics across all groups. The MPA exhibited the highest mean wall stress and TM in the longitudinal and circumferential directions, while the bifurcation region yielded the highest values of AI and AUC. All regions revealed a higher stiffness in the longitudinal direction compared to the circumferential direction, suggesting a degree of anisotropy that is believed to be within the margin of experimental uncertainty. Collagen content was found to be the highest in the MPA and decreased significantly at the bifurcation, LPA and RPA. Elastin content did not yield such significant differences amongst the ten groups. The MPA had the highest IMT, which decreased concomitantly to the distal LPA and RPA. No significant differences were found in the AT amongst the ten groups.

Conclusion

The mechanical properties of porcine pulmonary arteries exhibit strong regional dissimilarities, which can be used to inform future studies of high fidelity finite element models.
Vorheriger Artikel Adaptive Remodeling in the Elastase-Induced Rabbit Aneurysms

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Metadaten
Titel
Ex Vivo Regional Mechanical Characterization of Porcine Pulmonary Arteries
verfasst von
N.R. Pillalamarri
S.S. Patnaik
S. Piskin
P. Gueldner
E.A. Finol
Publikationsdatum
07.01.2021
Verlag
Springer US
Erschienen in
Experimental Mechanics / Ausgabe 1/2021
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-020-00678-2

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