Bovine pericardium retail preserved in glutaraldehyde and used as a vascular patch

<p>Abstract</p> <p>Background</p> <p>In this study we evaluated the performance of bovine pericardium preserved in glutaraldehyde used as a vascular patch.</p> <p>Methods</p> <p>Fourteen young pigs, six females and eight males, weighting 10.3 - 18.4 kg were used in our study. We implanted three remnants in each pig, two in the abdominal aorta and one was juxtaposed to the peritoneum. The smooth face (SF) and rough face (RF) of each remnant were implanted turned to the vessel inner portion and one remnant was juxtaposed to the peritoneum. The animals were sacrificed in 4.5 - 8 months after surgery (75 - 109 kg). The remnants were assessed for aorta wall, fibroses formation in inner apposition and calcification related to the face turned to the vessel inner portion.</p> <p>Results</p> <p>The rough face showed a lower dilatation level compared to the face implanted in adjacent aorta. There was no difference between intensity and/or incidence of graft calcification when the superficies were compared. The bovine pericardium preserved in glutaraldehyde did not show alterations in its structure when implanted with different faces turned to the inner portion of vessel.</p> <p>Conclusion</p> <p>When turned to the inner portion of the vessel, the rough face of the remnant presented a lower dilatation in relation to the adjacent aorta and a better quality of endothelium layer and did not show a difference between intensity and/or incidence of graft calcification.</p

Comparação do processo de reparo ósseo em tíbias de ratas normais e osteopênicas Bone repair process in normal and osteopenic female rats' tibiae: a comparative study

O objetivo foi comparar a consolidação óssea em tíbias de ratas normais e osteopênicas. 49 ratas albinas fêmeas, linhagem Wistar, peso médio de 160 (&plusmn; 20g) e 100 dias foram distribuídas em 2 grupos: Ooforectomizado (OOF) e Pseudo-ooforectomizado (Grupo controle - SHAM). 30 dias após a ooforectomia e/ou cirurgia simulada, todas foram submetidas à produção de lesão óssea cortical. Foram sacrificadas na 2ª, 4ª, 6ª e 8ª semanas. Os osteoblastos foram contados. O peso aumentou progressivamente, porém as OOF apresentaram maior peso (p<0,05) quando comparadas as SHAM, à época da segunda cirurgia. 15 dias pós-lesão óssea, as OOF apresentaram maior número de osteoblastos (p<0,05) quando comparados as SHAM. 30 dias pós-lesão óssea houve diminuição no número de osteoblastos, porém os valores foram equivalentes entre os dois grupos OOF e SHAM. 45 dias pós-lesão, apesar da diminuição constante de osteoblastos, o grupo OOF permaneceu elevado quando comparado ao grupo controle (p<0,05). Aos 60 dias o grupo SHAM apresentou menos osteoblastos, sugerindo processo avançado de reparo ósseo. Os animais osteopênicos apresentaram resposta inicial acelerada à lesão óssea, possibilitando a equivalência entre os grupos 30 dias pós-lesão. Mas, após este período apresentaram retardo na mineralização do osteóide, sugerindo atraso tardio no processo de reparo ósseo.<br>The purpose was to compare tibial bone union in normal and osteopenic female rats. Forty-nine Wistar albino female rats weighing 160 g (&plusmn;20g) and 100 days were distributed into 2 groups: Oophorectomized (OOF) and Pseudo-oophorectomized (SHAM). Thirty days later, a cortical injury was produced in all the animals. They were sacrificed in the 2nd, 4th, 6th and 8th weeks. Osteoblasts count was performed. Progressive weight increase was observed, but the OOF group was shown to have gained more weight (p&pound;0.05) than the SHAM group, at the time of the second surgery. After 15 days post-injury, the animals in the OOF group presented a higher number of osteoblasts (p&pound;0.05) compared to the SHAM group. Thirty days after injury, the number of osteoblasts was reduced, but both groups showed similar amounts. Forty-five days after injury, despite a constant reduction, the number of osteoblasts in the OOF group remained high when compared to SHAM (p&pound;0.05) group. After 60 days, we found less osteoblasts in the SHAM group, suggesting an advanced bone repair process. The osteopenic animals showed an early accelerated response, which became equivalent between both groups 30 days after injury. However, after that period, they showed a delayed osteoid mineralization, suggesting delayed late bone repair process