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Biomechanical analysis of wrapping of the moderately dilated ascending aorta.

Plonek T, Rylski B, Dumanski A, Siedlaczek P, Kustrzycki W - J Cardiothorac Surg (2015)

Bottom Line: The finite elements analysis showed that the stress exerted on the outer surface of the ascending aorta in the wrapping model (0.05-0.8 MPa) was similar to that observed in the normal aorta (0.03-0.7 MPa) and was lower than in the model of a moderately dilated aorta (0.06-1.4 MPa).The stress on the inner surface of the ascending aorta ranged from 0.2 MPa to 0.4 MPa in the model of the normal aorta, from 0.3 to 1.3 MPa in the model of the dilated aorta and from 0.05 MPa to 0.4 MPa in the wrapping model.The results of this study suggest that the aortic wall is subjected to similar stress following a wrapping procedure to the one present in the normal aorta.

View Article: PubMed Central - PubMed

Affiliation: Department of Cardiac Surgery, Wroclaw Medical University, Borowska 213, 50-556, Wroclaw, Poland. tomaszplonek@gmail.com.

ABSTRACT

Background: External wrapping is a surgical method performed to prevent the dilatation of the aorta and to decrease the risk of its dissection and rupture. However, it is also believed to cause degeneration of the aortic wall. A biomechanical analysis was thus performed to assess the stress of the aortic wall subjected to external wrapping.

Methods: A stress analysis using the finite elements method was carried out on three models: a non-dilated aorta, a moderately dilated aorta and a wrapped aorta. The models were subjected to a pulsatile flow (120/80 mmHg) and a systolic aortic annulus motion of 11 mm.

Results: The finite elements analysis showed that the stress exerted on the outer surface of the ascending aorta in the wrapping model (0.05-0.8 MPa) was similar to that observed in the normal aorta (0.03-0.7 MPa) and was lower than in the model of a moderately dilated aorta (0.06-1.4 MPa). The stress on the inner surface of the ascending aorta ranged from 0.2 MPa to 0.4 MPa in the model of the normal aorta, from 0.3 to 1.3 MPa in the model of the dilated aorta and from 0.05 MPa to 0.4 MPa in the wrapping model.

Conclusions: The results of this study suggest that the aortic wall is subjected to similar stress following a wrapping procedure to the one present in the normal aorta.

No MeSH data available.


Related in: MedlinePlus

The discrete model of the aortic wrapping with visible finite elements’ net
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Fig1: The discrete model of the aortic wrapping with visible finite elements’ net

Mentions: Three computational models were created for further analysis – models of the normal aorta and a moderately dilated aorta with and without wrapping. The mechanical properties of the aortic wall were established according to data available from other biomechanical studies [12–14]. Young’s modulus for the aortic wall was 6 MPa and Poisson’s ratio was 0.49. Afterwards, discrete models (divided into finite elements) were created and a sensitivity study of the finite elements’ mesh was carried out. Hexahedral finite elements were chosen for the discretization with a quadratic shape function. The discrete model of aortic wrapping is shown in Fig. 1.


Biomechanical analysis of wrapping of the moderately dilated ascending aorta.

Plonek T, Rylski B, Dumanski A, Siedlaczek P, Kustrzycki W - J Cardiothorac Surg (2015)

The discrete model of the aortic wrapping with visible finite elements’ net
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4522071&req=5

Fig1: The discrete model of the aortic wrapping with visible finite elements’ net
Mentions: Three computational models were created for further analysis – models of the normal aorta and a moderately dilated aorta with and without wrapping. The mechanical properties of the aortic wall were established according to data available from other biomechanical studies [12–14]. Young’s modulus for the aortic wall was 6 MPa and Poisson’s ratio was 0.49. Afterwards, discrete models (divided into finite elements) were created and a sensitivity study of the finite elements’ mesh was carried out. Hexahedral finite elements were chosen for the discretization with a quadratic shape function. The discrete model of aortic wrapping is shown in Fig. 1.

Bottom Line: The finite elements analysis showed that the stress exerted on the outer surface of the ascending aorta in the wrapping model (0.05-0.8 MPa) was similar to that observed in the normal aorta (0.03-0.7 MPa) and was lower than in the model of a moderately dilated aorta (0.06-1.4 MPa).The stress on the inner surface of the ascending aorta ranged from 0.2 MPa to 0.4 MPa in the model of the normal aorta, from 0.3 to 1.3 MPa in the model of the dilated aorta and from 0.05 MPa to 0.4 MPa in the wrapping model.The results of this study suggest that the aortic wall is subjected to similar stress following a wrapping procedure to the one present in the normal aorta.

View Article: PubMed Central - PubMed

Affiliation: Department of Cardiac Surgery, Wroclaw Medical University, Borowska 213, 50-556, Wroclaw, Poland. tomaszplonek@gmail.com.

ABSTRACT

Background: External wrapping is a surgical method performed to prevent the dilatation of the aorta and to decrease the risk of its dissection and rupture. However, it is also believed to cause degeneration of the aortic wall. A biomechanical analysis was thus performed to assess the stress of the aortic wall subjected to external wrapping.

Methods: A stress analysis using the finite elements method was carried out on three models: a non-dilated aorta, a moderately dilated aorta and a wrapped aorta. The models were subjected to a pulsatile flow (120/80 mmHg) and a systolic aortic annulus motion of 11 mm.

Results: The finite elements analysis showed that the stress exerted on the outer surface of the ascending aorta in the wrapping model (0.05-0.8 MPa) was similar to that observed in the normal aorta (0.03-0.7 MPa) and was lower than in the model of a moderately dilated aorta (0.06-1.4 MPa). The stress on the inner surface of the ascending aorta ranged from 0.2 MPa to 0.4 MPa in the model of the normal aorta, from 0.3 to 1.3 MPa in the model of the dilated aorta and from 0.05 MPa to 0.4 MPa in the wrapping model.

Conclusions: The results of this study suggest that the aortic wall is subjected to similar stress following a wrapping procedure to the one present in the normal aorta.

No MeSH data available.


Related in: MedlinePlus