VITOR CERVANTES GORNATI

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LIM/02 - Laboratório de Anatomia Médico-Cirúrgica, Hospital das Clínicas, Faculdade de Medicina

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  • article 15 Citação(ões) na Scopus
    Histologic analysis of stent graft oversizing in the thoracic aorta
    (2013) SINCOS, Igor Rafael; SILVA, Erasmo Simao da; BELCZAK, Sergio Quilici; SINCOS, Anna Paula Weinhardt Baptista; HIGUCHI, Maria de Lourdes; GORNATI, Vitor; OTOCH, Jose Pinatas; AUN, Ricardo
    Objective: To elucidate the histologic changes after stent graft oversizing in nonatherosclerotic aortas using an experimental porcine model. We previously reported that the diameter and angulation of the aorta in this model are similar to those in young individuals who undergo stent graft repair for blunt aortic injuries. The lack of commercially available stent grafts specific for repairing blunt aortic injuries, particularly for small and angulated aortas, may be related to the high rate of endograft complications in this population. Methods: Twenty-five pigs were randomized into one control group (without stent graft implantation) and four oversized groups (A: 10%-19%, B: 20%-29%, C: 30%-39%, and D: >40%). Three circumferential fragments were collected from the aorta for histologic and immunohistochemical studies. Morphometric analyzes were performed using an inflow system and image analysis software (Quantimet 500; Leica Cambridge Ltd, Cambridge, UK). Results: Collagen expression in the aortic wall was not significantly different among the five groups (P = .5604). There were significantly fewer muscle fibers in the aortic wall in the oversized groups compared with the control group (P = .000198). The proportion of elastic fibers in the aortic wall was significantly smaller in the oversized groups compared with the control group (P = .0000001). Immunohistochemical analysis showed that alpha-actin expression in the aortic wall was significantly decreased in the oversized groups compared with the control group (P= .002031). There were no significant differences in either the number of muscle fibers or alpha-actin expression among the four oversized groups. Conclusions: Histologic and immunohistochemical studies confirmed the structural disarrangement of the aortic wall after insertion of an endoprosthesis, including reduced number of muscle and elastic fibers.