Bovine jugular venous conduit treated with the polyepoxy compound / 中南大学学报(医学版)

OBJECTIVE@#To determine the feasibility whether the bovine jugular venous conduit (BJVC) can be fixed with polyepoxy compound (PC).@*METHODS@#Twenty-four BJVCs were divided into 3 groups and fixed with polyepoxy compound (PC group, n = 8), glutaraldehyde (GA group, n = 8), and unfixed group (Control group, n = 8), respectively. The morphologic and mechanical properties of BJVCs in the 3 groups, including thickness, diameter, moisture content, denaturation temperature, tensile strength, elongation at break, and fixation index were measured. The rat subcutaneous model for the assessment of tissue calcification was used. The calcium content in bovine jugular vein patches and valves was determined by flame atomic absorption spectrophotometer.@*RESULTS@#There was no difference in the wall thickness, diameter, and tissue water content between PC and the control group, but significant difference was found between GA and PC groups. The mechanical properties of PC group and GA group were not significantly different, but they were better than those of the control group. GA-fixed BJVC samples showed clear calcification, while PC fixed BJVC were calcified significantly less.@*CONCLUSION@#PC is an effective and suitable choice for the treatment of BJVC since it can effectively preserve the structure and the anti-reflow function of valves in bovine jugular vein and it has better anti-calcification properties.

Immunogenicity of bovine jugular vein conduits treated with different cross-linking methods / 中南大学学报(医学版)

OBJECTIVE@#To evaluate the immunogenicity of bovine jugular vein conduits (BJVCs) treated with different cross-linking methods.@*METHODS@#The BJVCs were treated with glutaradehyde (GA), dye-mediated photooxidation (DMP) and polyepoxy compound (PC) (n = 10). The tissue homogenates obtained from BJVCs treated with PC, GA, DMP, and fresh BJVCs, were mixed with the complete Freand adjavant to form the emulsive antigen, which were used to immunize rabbits correspondently. The antibody concentrations to BJVCs in those rabbits' serum were measured by counter double immuno diffusion. The immunologic responses to the BJVCs in different groups were measured with Western blotting.@*RESULTS@#The positive bands appeared when the sera of rabbits were immunized by fresh BJVCs reacted with antigens of fresh BJVCs, but no bands appeared when the sera of rabbits were immunized by fresh BJVCs reacted with those antigens of the BJVCs treated with GA, DMP, and PC in Western blotting.@*CONCLUSION@#The immunogenicity of BJVCs treated with PC, DMP, and GA can be reduced significantly and meet the clinical standard.

Myocardial protective effects of pretreatment with captopril on ischemia-reperfusion myocardium in rabbits / 中南大学学报(医学版)

OBJECTIVE@#To investigate the effect of pretreatment with captopril on myocardium ischemia-reperfusion injury in atherosclerotic rabbits.@*METHODS@#Thirty-two New Zealand white rabbits were assigned randomly to the normally feed group, cholesterol-feed (CF) group, and cholesterol food plus captopril group (cap-feed group), which were fed for 10 weeks. We examined the changes in the size of the infarct and changes in the myocardium ultrastructure resulting from coronary ischemia/reperfusion. Levels of endothelin (ET) and nitic oxide (NO) were measured in the different experiment stages.@*RESULTS@#The ET levels significantly increased and the content of NO significantly decreased in the CF group compared with those of the cap-feed group. The ultrastructure of myocardium cell was slightly destroyed and the infarct size was significantly smaller in the cap-feed group than the normally feed rabbits and CF rabbits.@*CONCLUSION@#The long-term captopril treatment can lighten the severity of myocardial injury produced by coronary ischemia/reperfusion.