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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

A comparison of the preoperative and postoperative angio-CT images of the ascending aorta subjected to an external wrapping
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Fig3: A comparison of the preoperative and postoperative angio-CT images of the ascending aorta subjected to an external wrapping

Mentions: The aorta was subjected to a pulsatile flow. The analyses were carried out during a single cardiac cycle with a systolic pressure of 120 mmHg and a diastolic pressure of 80 mmHg. The heart cycle was divided into 12 phases and the stress values for every phase were obtained. Systolic up-and-down movements of the proximal ascending aorta were also taken into account. An 11 mm systolic up-and-down motion of the aortic annulus was applied in all simulations (Fig. 3). The branches of the aortic arch were virtually suspended to allow stretching of the ascending aorta during systole and the movement on the Y axis. The distal part of the model, which corresponds to the proximal part of the descending aorta, was immobilized so that it could only be rotated around the Z axis. The tissues around the aorta were not simulated.Fig. 3


Biomechanical analysis of wrapping of the moderately dilated ascending aorta.

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

A comparison of the preoperative and postoperative angio-CT images of the ascending aorta subjected to an external wrapping
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig3: A comparison of the preoperative and postoperative angio-CT images of the ascending aorta subjected to an external wrapping
Mentions: The aorta was subjected to a pulsatile flow. The analyses were carried out during a single cardiac cycle with a systolic pressure of 120 mmHg and a diastolic pressure of 80 mmHg. The heart cycle was divided into 12 phases and the stress values for every phase were obtained. Systolic up-and-down movements of the proximal ascending aorta were also taken into account. An 11 mm systolic up-and-down motion of the aortic annulus was applied in all simulations (Fig. 3). The branches of the aortic arch were virtually suspended to allow stretching of the ascending aorta during systole and the movement on the Y axis. The distal part of the model, which corresponds to the proximal part of the descending aorta, was immobilized so that it could only be rotated around the Z axis. The tissues around the aorta were not simulated.Fig. 3

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