Constitutive modelling of lamb aorta

Research output: Chapter in Book/Conference paperChapterpeer-review


Vascular inflammation is an established marker of cardiovascular pathogenesis, particularly atherosclerosis, but its role on arterial tissue biomechanics is not well understood. Its impact on the biomechanics of the aorta can yield valuable data for elucidating its role in disease formation, as well as leading to the development of valuable predictive models for surgery and new treatments. Changes in arterial biomechanics can lead to arterial remodelling and dysfunction, and so its quantification can provide insight into the nature of inflammatory processes. To gain further insight into these processes we investigated the biomechanical behaviour of lamb aortas from inflamed and control groups through the development of a constitutive model. The development of reliable constitutive models of the artery is necessary in order to fully understand the mechanical component of cardiovascular disease pathogenesis and vascular remodelling. We used a foetal sheep model of systemic inflammation induced by prenatal lipopolysaccharide (LPS) treatment (n = 6) to investigate the effects of short-term inflammation on the passive biomechanical response of the aorta. We subjected samples cut from aortas (LPS, n = 6; control, n = 4) to uniaxial tension testing until failure, measuring vessel dimensions and force–displacement curves. Upon calibration of a first order Ogden model to fit the data, a difference was found in the μ parameter (4.43 × 10−4 ± 3.67 × 10−4 control, 7.77 × 10−4 ± 6.96 × 10−4 LPS-treated) and no difference was noted in the α parameter (12.96 ± 2.145 control, 12.65 ± 3.378 LPS-treated), although neither finding was statistically significant (p > 0.4, p > 0.8, respectively). Our preliminary ex-vivo data suggests that intra-amniotic LPS-induced systemic inflammation does not significantly change the stiffness or strength of the aorta. With further work, we hope our study can help fully elucidate the role of inflammation on aorta biomechanics.
Original languageEnglish
Title of host publicationComputational biomechanics for medicine
Subtitle of host publicationFrom algorithms to models and applications
EditorsAdam Wittek, Grand Joldes, Poul M.F. Nielsen, Barry J. Doyle, Karol Miller
PublisherSpringer International Publishing
Number of pages11
ISBN (Electronic)9783319544816
ISBN (Print)9783319544809
Publication statusPublished - 29 Apr 2017
EventComputational Biomechanics for Medicine XI - Athens, Greece
Duration: 17 Oct 201621 Oct 2016

Publication series

NameComputational Biomechanics for Medicine
PublisherSpringer International Publishing


WorkshopComputational Biomechanics for Medicine XI
Abbreviated titleMICCAI 2016
Internet address


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