TY - JOUR
T1 - Biomechanical characterization of a chronic type a dissected human aorta
AU - Amabili, Marco
AU - Arena, Goffredo O
AU - Balasubramanian, Prabakaran
AU - Breslavsky, Ivan D
AU - Cartier, Raymond
AU - Ferrari, Giovanni
AU - Holzapfel, Gerhard A
AU - Kassab, Ali
AU - Mongrain, Rosaire
N1 - Copyright © 2020 Elsevier Ltd. All rights reserved.
PY - 2020/9/18
Y1 - 2020/9/18
N2 - Aortic dissection is one of the most lethal cardiovascular diseases. A chronic Type A (Stanford) dissected aorta was retrieved for research from a 73-year-old male donor without diagnosed genetic disease. The aorta presented a dissection over the full length, and it reached a diameter of 7.7 cm in its ascending portion. The descending thoracic aorta underwent layer-specific quasi-static and dynamic mechanical characterizations after layer separation. Mechanical tests showed a physiological (healthy) behavior of the intima and some mechanical anomalies of the media and the adventitia. In particular, the static stiffness of both these layers at smaller strains was three times smaller than any one measured for twelve healthy aortas. When the viscoelastic properties were tested, adventitia presented a larger relative increase of the dynamic stiffness at 3 Hz with respect to most of the healthy aortas. The loss factor of the adventitia, which is associated with dissipation, was at the lower limit of those measured for healthy aortas. It seems reasonable to attribute these anomalies of the mechanical properties exhibited by the media and the adventitia to the severe remodeling secondary to the chronic nature of the dissection. However, it cannot be excluded that some of the mechanical anomalies were present before remodeling.
AB - Aortic dissection is one of the most lethal cardiovascular diseases. A chronic Type A (Stanford) dissected aorta was retrieved for research from a 73-year-old male donor without diagnosed genetic disease. The aorta presented a dissection over the full length, and it reached a diameter of 7.7 cm in its ascending portion. The descending thoracic aorta underwent layer-specific quasi-static and dynamic mechanical characterizations after layer separation. Mechanical tests showed a physiological (healthy) behavior of the intima and some mechanical anomalies of the media and the adventitia. In particular, the static stiffness of both these layers at smaller strains was three times smaller than any one measured for twelve healthy aortas. When the viscoelastic properties were tested, adventitia presented a larger relative increase of the dynamic stiffness at 3 Hz with respect to most of the healthy aortas. The loss factor of the adventitia, which is associated with dissipation, was at the lower limit of those measured for healthy aortas. It seems reasonable to attribute these anomalies of the mechanical properties exhibited by the media and the adventitia to the severe remodeling secondary to the chronic nature of the dissection. However, it cannot be excluded that some of the mechanical anomalies were present before remodeling.
KW - Aortic dissection
KW - Chronic dissection
KW - Hyperelastic material
KW - Mechanical characterization
KW - Viscoelastic material
UR - http://www.scopus.com/inward/record.url?scp=85088917806&partnerID=8YFLogxK
U2 - 10.1016/j.jbiomech.2020.109978
DO - 10.1016/j.jbiomech.2020.109978
M3 - Article
C2 - 32827785
SN - 1873-2380
VL - 110
JO - Journal of Biomechanics
JF - Journal of Biomechanics
M1 - 109978
ER -