Effect of aneurysm on the tensile strength and biomechanical behavior of the ascending thoracic aorta David A Vorp, PhD, Brian J Schiro, BS, Marek P.

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University of Pittsburgh Vascular Bioengineering Laboratory Departments of Surgery and Bioengineering and the McGowan Institute for Regenerative Medicine.

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Presentation transcript:

Effect of aneurysm on the tensile strength and biomechanical behavior of the ascending thoracic aorta David A Vorp, PhD, Brian J Schiro, BS, Marek P Ehrlich, MD, Tatu S Juvonen, MD, M.Arisan Ergin, MD, Bartley P Griffith, MD The Annals of Thoracic Surgery Volume 75, Issue 4, Pages 1210-1214 (April 2003) DOI: 10.1016/S0003-4975(02)04711-2

Fig 1 Schematic stress-strain curve demonstrating definitions of tensile strength and maximum tangential stiffness (MTS) used in this study. The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)

Fig 2 Tensile strength of longitudinal (LONG) and circumferential (CIRC) specimens of ascending thoracic aortic aneurysm (■) and control (nonaneurysmal) aortic tissue (□). Values shown are mean ± SEM. The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)

Fig 3 Strength versus diameter for longitudinal (LONG; A) and circumferential (CIRC; B) specimens of ascending thoracic aortic aneurysm. No correlation was found between strength and diameter for either orientation (R = 0.008 and R = 0.086, respectively). The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)

Fig 4 Maximum tangential modulus (MTS) of longitudinal (LONG) and circumferential (CIRC) specimens of ascending thoracic aortic aneurysm (■) and nonaneurysmal control (□) aortic tissue. Values shown are mean ± SEM. The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)

Fig 5 Fit of mathematical model given by Equation 1 (black line curve), to stress-strain data (x) for representative ascending thoracic aortic aneurysm (ATAA; A) and control (B) specimens. The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)

Fig 6 Model parameters α (A) and β (B) as defined by Equation 1 for longitudinal (LONG) and circumferential (CIRC) specimens of ascending thoracic aortic aneurysm (solid bar) and control (nonaneurysmal) (open bar) aortic tissue. Values shown are mean ± SEM. The Annals of Thoracic Surgery 2003 75, 1210-1214DOI: (10.1016/S0003-4975(02)04711-2)