The in vitro evaluation of the elastic properties of the ascending aorta
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1 The in vitro evaluation of the elastic properties of the ascending aorta Siyu LIN 1, Alain LALANDE 1, Marie-Catherine MORGANT 1, Stéphane AVRIL 2, Olfa TRABELSI 2, Olivier BOUCHOT 1 1 Laboratoire Le2i, Université de Bourgogne, Service de Chirurgie Cardiovasculaire, CHU de Dijon 2 CIS-EMSE, Mines Saint-Etienne
2 Contexte Risk of Ascending aortic aneurysm (AsAA) Dilation of the ascending aorta Dissection or rupture if diameter increase AsAA replacement indication (Maximum diameter): > 45 mm if connects with tissue disease (Marfan) > 50 mm if associates with aortic bicuspid > 55 mm > 0.5 mm growth per year 2
3 Study Flow- 3 Screening patients with ascending aortic aneurysm Recruitment of 40 patients Biomechanical properties study Preoperative Cardiac MRI Calculation of aortic elasticity 3
4 MRI Classical protocol with additional specific sequences for local elasticity evaluation Specific cine-mri Compliance (mm²/mmhg) A. Dogui, etc, (Jan. 2011) Consistency of aortic distensibility and pulse wave velocity estimates with respect to the Bramwell-Hill theoretical model: A cardiovascular magnetic resonance study. Journal of Cardiovascular Magnrtic Resonance 13(1):11 4
5 MRI Classical protocol with additional specific sequences for local elasticity evaluation 5 J Mitéran, O Bouchot, A Cochet, A Lalande. (2018) Automatic determination of aortic compliance based on MRI and adapted curvilinear detector. Biomedical Signal Processing and Control 40,
6 Study Flow- 3 Screening patients with ascending aortic aneurysm Recruitment of 40 patients Biomechanical properties study Preoperative Cardiac MRI Calculation of aortic elasticity Surgical intervention of ascending aortic replacement 6
7 Surgical intervention Removal of the ascending aorta Removal of the resected aorta Replacement with the rigid prosthesis Dacron 7
8 Study Flow- 3 Screening patients with ascending aortic aneurysm Recruitment of 40 patients Biomechanical properties study Preoperative Cardiac MRI Calculation of aortic elasticity Surgical intervention of ascending aortic replacement Biaxial tests on AsAA samples Postoperative Cardiac MRI 8
9 In-vitro Mechanical properties test 9
10 Parameter calculation Alexander E., ect. Biomechanics of the Ascending Thoracic Aorta: A Clinical Perspective on Engineering Data. Canadian Journal of Cardiology,, January 2016, Pages Nusrat C., etc. Local mechanical and structural properties of 10 healthy and diseased human ascending aorta tissue. Cardiovascular Pathology, March April 2009, Pages 83-91
11 Results of the biaxial tests3 11
12 Study Flow- 3 Screening patients with ascending aortic aneurysm Recruitment of 40 patients Biomechanical properties study Preoperative Cardiac MRI Surgical intervention of Ascending aortic replacement Calculation of aortic elasticity Correction? Biaxial tests on AsAA samples Postoperative Cardiac MRI 12
13 Discussion3 Sufficient AsAA tissue source (40 patients recruitment) Classified simples Dilated bicuspid aortic valve, tricuspid aortic valve, healthy simples Accurate testing and measurement machine Litematic VL-50, Mitutoyo Prospection Include blood simple study In vivo modeling and numerical simulation LM1 TestBench, ElectorForce A prospective, monocentric, experimental study 13
14 The in vitro evaluation of the elastic properties of the ascending aorta Siyu LIN 1, Alain LALANDE 1, Marie-Catherine MORGANT 1, Stéphane AVRIL 2, Olfa TRABELSI 2, Olivier BOUCHOT 1 1 Laboratoire Le2i, Université de Bourgogne, Service de Chirurgie Cardiovasculaire, CHU de Dijon 2 CIS-EMSE, Mines Saint-Etienne
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