ARISTIDES TADEU CORREIA
Projetos de Pesquisa
Unidades Organizacionais
Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina
LIM/61 - Laboratório de Pesquisa em Cirurgia Torácica, Hospital das Clínicas, Faculdade de Medicina
LIM/61 - Laboratório de Pesquisa em Cirurgia Torácica, Hospital das Clínicas, Faculdade de Medicina
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- Alternative solution for ex vivo lung perfusion, experimental study on donated human lungs non-accepted for transplantation(2015) FERNANDES, Lucas Matos; MARIANI, Alessandro Wasum; MEDEIROS, Israel Lopes de; SAMANO, Marcos Naoyuki; ABDALLA, Luís Gustavo; CORREIA, Aristides Tadeu; NEPOMUCENO, Natália Aparecida; CANZIAN, Mauro; PêGO-FERNANDES, Paulo ManuelPURPOSE: To evaluate a new perfusate solution to be used for ex vivo lung perfusion. METHODS: Randomized experimental study using lungs from rejected brain-dead donors harvested and submitted to 1 hour of ex vivo lung perfusion (EVLP) using mainstream solution or the alternative. RESULTS: From 16 lungs blocs tested, we found no difference on weight after EVLP: Steen group (SG) = 1,097±526g; Alternative Perfusion Solution (APS) = 743±248g, p=0.163. Edema formation, assessed by Wet/dry weigh ratio, was statistically higher on the Alternative Perfusion Solution group (APS = 3.63 ± 1.26; SG = 2.06 ± 0.28; p = 0.009). No difference on PaO2 after EVLP (SG = 498±37.53mmHg; APS = 521±55.43mmHg, p=0.348, nor on histological analyses: pulmonary injury score: SG = 4.38±1.51; APS = 4.50±1.77, p=0.881; apoptotic cells count after perfusion: SG = 2.4 ± 2.0 cells/mm2; APS = 4.8 ± 6.9 cells/mm2; p = 0.361). CONCLUSION: The ex vivo lung perfusion using the alternative perfusion solution showed no functional or histological differences, except for a higher edema formation, from the EVLP using Steen Solution(r) on lungs from rejected brain-dead donors.
- Biocompatibility of a new device of self-expandable covered and non-covered tracheal stent. Comparative study in rats(2013) RODRIGUES, Olavo Ribeiro; MINAMOTO, Helio; CANZIAN, Mauro; CORREIA, Aristides Tadeu; JATENE, Fabio BiscegliPURPOSE: To investigate the compatibility of a new model of self-expandable tracheal stent in rats. METHODS: A new device of polyurethane covered and non - covered stent was placed in the trachea of Wistar rats. Animals were distributed in two groups: the polyurethane covered and non-covered group. Macroscopic parameters included position within the tracheal lumen, adherence to the mucosa, degree of dilatation, permeability and internal diameter. Microscopic findings evaluated were: incorporation, inflammatory activity, granulation tissue and epithelial revetment injuries. The observation follow-up was six weeks. All parameters were quantified based on determined score values. Incorporation of the stents was evaluated based on the observation if the stent was fixed into the trachea or if it could be removed. Degree of dilatation was performed by external diameter measurements. Granulation tissue was evaluated by measurements of height of the tissue growing into the tracheal lumen. RESULTS: 100% of non-covered stents had total attachment to mucosa and 100% of polyurethane covered type had adherence only. Regarding dilatation, granulation tissue, inflammatory activity and internal diameter measurements, there were no significant differences between the groups. Pathological tracheal wall injuries were present in both groups. CONCLUSION: Both models of stent demonstrated biocompatibility with the trachea. Rats are suitable for an experimental model of tracheal stent study.
- A modified hydrogel production protocol to decrease cellular content(2022) BRAGA, Gabriela Catao Diniz; CAMARGO, Cristina Pires; HARMSEN, Martin Conrad; CORREIA, Aristides Tadeu; SOUZA, Sonia; SEELAENDER, Marilia; NUNES, Viviane Araujo; SANTOS, Jeniffer Farias dos; NERI, Elida Adalgisa; VALADAO, Iuri Cordeiro; MOREIRA, Luiz Felipe Pinho; GEMPERLI, RolfPurpose: To analyze the cytotoxicity and cell in porcine-derived decellularized skin matrix. Methods: We analyzed the effect of multiple decellularization processes by histological analysis, DNA quantification, and flow cytometry. Subsequently, we analyzed the most appropriate hydrogel concentration to minimize cytotoxicity on fibroblast culture and to maximize cell proliferation. Results: After the fourth decellularization, the DNA quantification showed the lowest DNA concentration (< 50 ng/mg). Histological analysis showed no cell components in the hydrogel. Moreover, hematoxylin and eosin showed a heterogeneous structure of collagen fibers. The best hydrogel concentration ranged from 3 to 25%, and there was no significant difference between the 24 hours and seven days. Conclusion: The process of hydrogel production was effective for removing cells and DNA elements. The best hydrogel concentration ranged from 3 to 25%.