Influence of aneurysm wall stiffness and the presence of intraluminal thrombus on the wall movement of an aneurysm - an in vitro study.
The purpose of this in vitro study was to investigate the influence of aneurysm wall stiffness and of the presence of intraluminal thrombus (ILT) on aneurysm wall movement. Three latex aneurysms were used with different wall stiffness. The aneurysms, equipped with 20 tantalum markers, were attached to an in vitro circulation model. Fluoroscopic roentgenographic stereo photogrammetric analysis was used to measure marker movement during six cardiac cycles at three different systemic pressures. To investigate the influence of ILT on wall movement, we repeated the same experiment with one of the aneurysms. The aneurysm sac was then filled with one of two E-moduli differing thrombus analogues (Novalyse 8 and 20) or with perfusate as a control. It was noted that the amplitude of the wall movement (mm) increased significantly (P < 0.05) as the compliance of the wall increased. The mean amplitude of the wall movement decreased (P < 0.05) as the stiffness (E-modulus) of the ILT increased. In conclusion, ILT has a 'cushioning effect'. Wall movement (and theoretically wall stress) diminishes when the stiffness of the ILT increases. Compliance of the aneurysm wall influences wall movement. When the stiffness of the wall increases, the wall movement diminishes.
Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands. W.M.P.F.Bosman@lumc.nl
W M P F
WM
Bosman
J W
JW
Hinnen
W H
WH
Kopp
T J
TJ
van der Steenhoven
B L
BL
Kaptein
O H J
OH
Koning
J F
JF
Hamming
D001012:Aorta, Abdominal / Q000473:pathology / Q000503:physiopathology*; D017544:Aortic Aneurysm, Abdominal / Q000473:pathology / Q000503:physiopathology*; D001019:Aortic Rupture / Q000473:pathology / Q000503:physiopathology; D001696:Biomechanical Phenomena; D001794:Blood Pressure; D003187:Compliance; D055119:Elastic Modulus; D005471:Fluoroscopy; D006801:Humans; D007840:Latex; D008955:Models, Cardiovascular; D009426:Netherlands; D010780:Photogrammetry; D013314:Stress, Mechanical; D013927:Thrombosis / Q000473:pathology / Q000503:physiopathology*; D059289:Vascular Stiffness
D007840:Latex