Relationship between oxidative stress and inflammation in peripheral and cerebral system of oxonate-induced hyperuricemic rats

To study what kind of role uric acid play on the relationship between oxidative Stress and inflammation in peripheral and cerebral system of oxonate-induced hyperuricemic rats. Twenty-six eight male Wistar rats were divided into two groups randomly. Potassium oxonate was used to establish hyperuricemic model for four weeks. In 2nd and 4th week, uric acid (UA) level, total superoxide dismutase (T-SOD), Gu,Zn-SOD activity and interleukin-1beta (IL-1ß) concentration in serum were determined respectively. In 4th week, one hour after last PO treatment, five rats of every group were given Evans Blue to test blood-brain barrier (BBB) permeability. Other brains were obtained to analysis T-SOD, Gu,Zn-SOD activity and IL-1ß concentration in cerebral system. Meanwhile, brain and kidney were stained with hematoxylin and eosin (H&E) to observe pathological change. In 2nd week, both of T-SOD and Gu,Zn-SOD activity in serum increased obviously (P<0.05) in hyperuricemia rats. However, IL-1ß content didn't change remarkably. In the 4th week, T-SOD activity in model group had become similar with control group, and at the same time IL-1ß content in serum increased significantly (P<0.05). Pathological section showed the structural and functional unit of the kidney had been damaged. On the contrary, both of T-SOD and Gu,Zn-SOD activity in brain increased obviously (P<0.05), but IL-1ß concentration was no significant difference between two groups. In addition, the results of Evans Blue and H&E suggested the integrity of BBB and structure of brain were not changed after PO treatment. The permeability of BBB and form of UA would be potential factors to decide what kind role UA play on keeping balance between anti-oxidative stress and induction of inflammatory response.

Reinforced aortic root reconstruction for acute type A aortic dissection involving the aortic root.

OBJECTIVE: There are debates regarding the optimal approach for AAAD involving the aortic root. We described a modified reinforced aortic root reconstruction approach for treating AAAD involving the aortic root. METHODS: A total of 161 patients with AAAD involving the aortic root were treated by our modified reinforced aortic root reconstruction approach from January 1998 to December 2008. Key features of our modified approach were placement of an autologous pericardial patch in the false lumen, lining of the sinotubular junction lumen with a polyester vascular ring, and wrapping of the vessel with Teflon strips. Outcome measures included post-operative mortality, survival, complications, and level of aortic regurgitation. RESULTS: A total of 161 patients were included in the study (mean age: 43.3 1 15.5 years). The mean duration of follow-up was 5.1 1 2.96 years (2-12 years). A total of 10 (6.2%) and 11 (6.8%) patients died during hospitalization and during follow-up, respectively. Thirty-one (19.3%) patients experienced postoperative complications. The 1-, 3-, 5-, and 10-year survival rates were 99.3%, 98%, 93.8%, and 75.5%, respectively. There were no instances of recurrent aortic dissection, aortic aneurysm, or pseudoaneurysm during the entire study period. The severity of aortic regurgitation dramatically decreased immediately after surgery (from 28.6% to 0% grade 3-4) and thereafter slightly increased (from 0% to 7.2% at 5 years and 9.1% at 10 years). CONCLUSION: This modified reinforced aortic root reconstruction was feasible, safe and durable/effective, as indicated by its low mortality, low postoperative complications and high survival rate.

Reinforced aortic root reconstruction for acute type A aortic dissection involving the aortic root / Reconstrução da raiz da aorta reforçada para dissecção aguda da aorta tipo A envolvendo a raiz da aórtica

OBJECTIVE: There are debates regarding the optimal approach for AAAD involving the aortic root. We described a modified reinforced aortic root reconstruction approach for treating AAAD involving the aortic root. METHODS: A total of 161 patients with AAAD involving the aortic root were treated by our modified reinforced aortic root reconstruction approach from January 1998 to December 2008. Key features of our modified approach were placement of an autologous pericardial patch in the false lumen, lining of the sinotubular junction lumen with a polyester vascular ring, and wrapping of the vessel with Teflon strips. Outcome measures included post-operative mortality, survival, complications, and level of aortic regurgitation. RESULTS: A total of 161 patients were included in the study (mean age: 43.3 1 15.5 years). The mean duration of follow-up was 5.1 1 2.96 years (2-12 years). A total of 10 (6.2%) and 11 (6.8%) patients died during hospitalization and during follow-up, respectively. Thirty-one (19.3%) patients experienced postoperative complications. The 1-, 3-, 5-, and 10-year survival rates were 99.3%, 98%, 93.8%, and 75.5%, respectively. There were no instances of recurrent aortic dissection, aortic aneurysm, or pseudoaneurysm during the entire study period. The severity of aortic regurgitation dramatically decreased immediately after surgery (from 28.6% to 0% grade 3-4) and thereafter slightly increased (from 0% to 7.2% at 5 years and 9.1% at 10 years). CONCLUSION: This modified reinforced aortic root reconstruction was feasible, safe and durable/effective, as indicated by its low mortality, low postoperative complications and high survival rate.

OBJETIVO: Há um debate sobre a melhor abordagem para dissecção aguda da aorta tipo A (DAAA) envolvendo a raiz da aorta. Nós descrevemos abordagem aórtica reforçada modificada de reconstrução de raiz para o tratamento DAAA envolvendo a raiz da aorta. MÉTODOS: Um total de 161 pacientes com DAAA envolvendo a raiz da aorta foram tratados pelo nosso abordagem reforçada modificada da reconstrução da raiz da aorta de janeiro de 1998 a dezembro de 2008. As características-chave da nossa abordagem modificada foram a colocação de um remendo de pericárdio autólogo na falsa luz, forro do lúmen supravalvar com um anel vascular, poliéster e envolvimento dos vasos com tiras de teflon. A avaliação pós-operatória incluiu mortalidade, sobrevivência, complicações, e grau de insuficiência aórtica. RESULTADOS: Um total de 161 pacientes foram incluídos no estudo (média de idade: 43,3 1 15,5 anos). A duração média de acompanhamento foi de 5,1 1 2,96 anos (2-12 anos). Um total de 10 (6,2%) e 11 (6,8%) pacientes morreram durante a internação e durante o acompanhamento, respectivamente. Trinta e um (19,3%) pacientes apresentaram complicações pós-operatórias. A 1 -, 3 -, 5 -, e as taxas de sobrevivência de 10 anos foram 99,3%, 98%, 93,8% e 75,5%, respectivamente. Não houve casos de dissecção aórtica recorrente, aneurisma ou pseudoaneurisma da aorta durante o período de estudo. A gravidade da regurgitação aórtica diminuiu drasticamente logo após a cirurgia (de 28,6% para grau 0 de 3-4%) e, posteriormente, teve ligeiro aumento (de 0% a 7,2% em 5 anos e de 9,1% aos 10 anos). CONCLUSÃO: A reconstrução da raiz da aorta reforçada modificada é viável, segura e durável/eficaz, como indicado pelas baixas mortalidade e complicações pós-operatórias e taxa de sobrevivência elevada.