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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 numerical model of the aorta with the fixation points, axes and the direction of the movement of the aortic annulus
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Fig2: The numerical model of the aorta with the fixation points, axes and the direction of the movement of the aortic annulus

Mentions: The diameters of the segments of the model of aorta were as follows: 38 mm at the level of the aortic root, 32 mm at the level of the tubular ascending aorta (45 mm in the model of the moderately dilated aorta) and 28 mm at the level of the descending aorta. The radius of the lesser curvature of the aortic arch was 25 mm. The diameters of the main branches of the aortic arch were 10 mm. In the wrapping technique, the aorta is additionally covered by the vascular prosthesis. In our experience, the aortic wall of the moderately dilated ascending aorta (40–55 mm) does not plicate when its diameter is decreased to approximately 30 mm (Fig. 2). Therefore, the inner surface of the wrapped portion of the aorta was simulated as an even surface.Fig. 2


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 numerical model of the aorta with the fixation points, axes and the direction of the movement of the aortic annulus
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig2: The numerical model of the aorta with the fixation points, axes and the direction of the movement of the aortic annulus
Mentions: The diameters of the segments of the model of aorta were as follows: 38 mm at the level of the aortic root, 32 mm at the level of the tubular ascending aorta (45 mm in the model of the moderately dilated aorta) and 28 mm at the level of the descending aorta. The radius of the lesser curvature of the aortic arch was 25 mm. The diameters of the main branches of the aortic arch were 10 mm. In the wrapping technique, the aorta is additionally covered by the vascular prosthesis. In our experience, the aortic wall of the moderately dilated ascending aorta (40–55 mm) does not plicate when its diameter is decreased to approximately 30 mm (Fig. 2). Therefore, the inner surface of the wrapped portion of the aorta was simulated as an even surface.Fig. 2

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