Abstract
to determine the blood flow pattern changes after endovascular treatment of saccular abdominal aortic aneurysm with triple stent. we conducted a hemodynamic study of seven Landrace and Large White pigs with saccular aneurysms of the infrarenal abdominal aorta artificially produced according to the technique described. The animals were subjected to triple stenting for endovascular aneurysm. We evaluated the pattern of blood flow by duplex scan before and after stent implantation. We used the non-paired Mann-Whitney test for statistical analysis. there was a significant decrease in the average systolic velocity, from 127.4cm/s in the pre-stent period to 69.81cm/s in the post-stent phase. There was also change in the flow pattern from turbulent in the aneurysmal sac to laminate intra-stent. there were changes in the blood flow pattern of saccular abdominal aortic aneurysm after endovascular treatment with triple stent. determinar as alterações do padrão do fluxo sanguíneo após tratamento endovascular do aneurisma sacular de aorta abdominal com triplo stent. estudo hemodinâmico de sete suínos das raças Landrace e Large White portadores de aneurismas saculares de aorta abdominal infrarrenal artificialmente produzidos segundo técnica descrita. Os animais foram submetidos a implante de triplo stent para correção endovascular do aneurisma e reavaliados por duplex scan quanto ao padrão do fluxo sanguíneo antes e após o implante dos stents. A análise estatística foi realizada com o teste Mann-Whitney não pareado. verificou-se uma queda significativa da velocidade sistólica média de 127,4cm/s na fase pré-stent para 69,81cm/s na fase pós-stent. Houve ainda mudança no padrão do fluxo de turbilhonar no saco aneurismático para laminar intrastent. o estudo demonstrou alterações do padrão do fluxo sanguíneo do aneurisma sacular de aorta abdominal após tratamento endovascular com triplo stent.
Highlights
The endovascular treatment of abdominal aortic aneurysms has become an increasingly used surgical alternative instead of traditional surgery[1]
We describe the quantitative variables that constitute Systolic Peak velocity (PSV) and resistance index (RI) before and after the triple stenting, which revealed significant changes, i.e., loss of systolic velocity after placement of stents, as well as the fall in resistance index in many animals
We observed a significant decrease with an average pre-stent velocity 127.4cm/s and a mean post-stent velocity 69,81 cm/s, confirming the change in blood flow patterns
Summary
The endovascular treatment of abdominal aortic aneurysms has become an increasingly used surgical alternative instead of traditional surgery[1]. Treatment is successful when there is full suppression of blood flow and systemic pressure in the aneurysmal sac, which prevent rupture[2,3,4]. We have achieved significant technological advances since the first generation of aortic stents, recent information from late postoperative follow-up have shown a significant percentage of complications requiring surgical reintervention. Arises a new therapeutic method, based on experimental haemodynamic studies, the multilayered stents: uncoated metal prostheses, capable of promoting redirection of blood flow within the aneurysm sac, preventing its expansion and rupture, even without total flow abolition in the aneurysmal sac[8,9,10,11,12,13,14]
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