PEDRO NOGUEIRA GIGLIO
Projetos de Pesquisa
Unidades Organizacionais
PAHC, Hospital das Clínicas, Faculdade de Medicina - Médico
2 resultados
Resultados de Busca
Agora exibindo 1 - 2 de 2
- Hippocampal plasticity in rats submitted to a gastric restrictive procedure(2011) SONODA, Elisa Yumi de Freitas; SILVA, Sergio Gomes da; ARIDA, Ricardo Mario; GIGLIO, Pedro Nogueira; MARGARIDO, Nelson Fontana; MARTINEZ, Carlos Augusto Real; PANSANI, Aline Priscila; MACIEL, Rude de Souza; CAVALHEIRO, Esper Abrao; SCORZA, Fulvio AlexandreBariatric surgery has been the most effective therapeutic intervention for morbidly obese patients. However, recent evidence has shown that this procedure may cause serious neurological complications such as Wernicke encephalopathy, depression, and memory impairment. With this in mind, we conducted an experimental study to investigate whether weight-reduction surgery would promote morphological changes in the hippocampal formation, a brain region linked to cognitive and emotional processes. To do so, the present study evaluated the hippocampal expression of parvalbumin interneurons in rats submitted to a gastric restrictive procedure (experimental phytobezoar). Our results demonstrated that rats with gastric-reduced capacity presented a significant increase in the expression of the parvalbumin interneurons in the hippocampal CA1 and CA3 subfields. These data are the first experimental evidence that restrictive bariatric surgery may alter hippocampal cytoarchitecture.
article 19 Citação(ões) na Scopus Impact of Stent-Graft Oversizing on the Thoracic Aorta: Experimental Study in a Porcine Model(2011) SINCOS, Igor Rafael; AUN, Ricardo; SILVA, Erasmo Simao da; BELCZAK, Sergio; HIGUCHI, Maria de Lourdes; GORNATI, Vitor Cervantes; GIGGLIO, Pedro Nogueira; BAPTISTA, Anna Paula Weinhardt; FIGUEIREDO, Luiz Francisco Poli dePurpose: To analyze in an experimental animal model the effect of 4 different levels of stents-graft oversizing on non-atherosclerotic aortas such as those found in young individuals who undergo stent-graft repair for traumatic aortic injuries. Methods: The diameter of the porcine thoracic aorta is similar to the aorta of young adults (18-20 mm), so 25 pigs were randomized into 5 groups: 1 control (without stent-graft) and 4 oversizing groups (A: 10%-19%, B: 20%-29%, C: 30%-39%, and D: >40%). Two types of biomechanical tests were performed on all aortas 4 weeks after endoprosthesis deployment. Results: The results of the detachment test, which analyzed the strength necessary to remove the stent-graft from the aorta, were similar in the 4 groups (A: 42 N, B: 41 N, C: 46 N, and D: 46 N). However, 2 aortas ruptured during the tests (groups C and D). The second test was performed in 3 aortic segments. Maximum shear strength, maximum stress, and maximum tension supported by the aortic wall had a negative and linear correlation with oversizing. There were significant differences in all 4 groups when compared with the control group. Strain, which reflects the elastic properties of the aortic wall, was very similar in all 4 groups, but a great difference was found when compared with the control group (p<0.0001). Conclusion: The study showed an important subacute change in the biomechanical properties of the aortic wall after implantation of an oversized endoprosthesis. This weakness of the aortic wall was confirmed by 2 ruptures during the detachment test. These results partially explain the interaction of stent-grafts with non-atherosclerotic thoracic aortas and may serve as a basis for further studies and the development of specific material to be used in vascular trauma and young patients. J Endovasc Ther. 2011; 18: 576-584