Effect of intra-arterial infusion with triolein emulsion on rabbit liver

AIM: To determine whether intra-arterial infusion of triolein emulsion has biochemical and histopathologic effect on rabbit liver.METHODS: An emulsion of 0.2 mL triolein in 20 mL of saline was infused into either the hepatic arteries of nine rabbits(group 1) or the superior mesenteric arteries of 12 rabbits(group 2). Five rabbits infused with 20 mL of normal saline were used as a control group(group 3). The serum aspartate aminotransferase(AST) and alanine aminotransferase(ALT) levels were measured to evaluate liver function in each group just before the infusion, at 2 h, day 1, day 4, and day 7 following infusion. Each rabbit in all of the groups was infused with Evans blue on day 7 to evaluate changes in vascular permeability, and obtain the stained area of the hepatic surface. If the stained area was not available, the anteroinferior portion of the right hepatic lobe was selected. The obtained tissues were examined by light, electron and confocal microscopy. The changes in AST and ALT levels at each time point were calculated and statistically analyzed using a mixed linear model. A P value < 0.05 was regarded as statistically significant. RESULTS: In group 1(hepatic artery group), both the AST and ALT serum levels increased significantly on day 1(P = 0.0016 and P < 0.0001, respectively) compared with the control group, followed by a decrease thereafter. In group 2(portal vein group), the AST level increased on day 4(P = 0.0095), while the ALT level increased significantly on day 1(P < 0.0001), and decreased thereafter, as compared with the control. For the remainder of the examination days, there were no significant changes in the AST and ALT levels(P > 0.05). Only three rabbits in each group showed hepatic surface staining with the Evans blue dye. Light and electron microscopic findings showed no specific changes in the selected hepatic tissues. Confocal microscopic examination with transferase-mediated dUTP nick-end labeling stain revealed lack of hepatocyte apoptosis in any of the groups. There were no differences in the results between group 1 and group 2.CONCLUSION: Infusion of triolein emulsion into rabbit livers revealed a minimal transient decrease of liverfunction,and no specific histopathologic changes.

Triolein emulsion infusion into the hepatic artery increases vascular permeability to doxorubicin in rabbit liver

BACKGROUND The infusion of triolein emulsion(TE)induced increased vascular permeability and a negligible and temporary decrease in liver function without specific histopathological damage.AIM To assess changes in doxorubicin concentration according to the percentage of TE infused via a hepatic artery to study the vascular permeability in the rabbit liver.METHODS Thirty-nine healthy rabbits were divided into five groups according to the concentration of emulsified triolein infused into the hepatic arteries:Group 0,saline infusion(control group,n=5);group 1,0.3%TE(n=13);group 2,0.6%TE(n=6);group 3,0.9%TE(n=8);and group 4,1.5%TE(n=6).Doxorubicin(2.4 mg/kg)was infused immediately after TE injection via the hepatic arteries.After 2 h,the livers were harvested,and doxorubicin concentrations were calculated fluorometrically.The doxorubicin concentrations were compared between TE groups and the control group,and the optimal concentrations within the TE groups were calculated.Statistical analysis was performed using the nonparametric Mann-Whitney U test and Kruskal-Wallis test.P<0.05 were considered statistically significant.RESULTS In the liver,doxorubicin concentrations were 2.06,2.07,2.16 and 1.66 times higher in groups 1 through 4,respectively,and significantly higher in the TE groups than in the control group(all P<0.05).However,there were no significant differences in the mean doxorubicin concentrations between the four TE groups(P=0.642).In the lungs,the mean doxorubicin concentrations were not significantly different between the control and TE groups(P>0.05).CONCLUSION TE infusion into the hepatic arteries significantly increased the doxorubicin concentration approximately twofold but was not different between the TE groups.These findings suggest that TE infusion might be a useful adjuvant treatment of liver cancers.

Characteristics of machined surface controlled by cutting tools and conditions in machining of brittle material

One of the ultra-precision machining methods was adapted for brittle material as well as soft material by using multi-arrayed diamond tips and high speed spindle. Conventional machining method is too hard to control surface roughness and surface texture against brittle material because the particles of grinding tools are irregular size and material can be fragile. Therefore, we were able to design tool paths and machine controlled pattern on surface by multi-arrayed diamond tips with uniform size made in MEMS fabrication and high speed spindle, and the maximum speed was about 3×105 r/min. We defined several parameters that can affect the machining surface. Those were multi-array of diamond tips (n×n), speed of air spindle and feeding rate. The surface roughness and surface texture can be controlled by those parameters for micro machining.

Rosai-Dorfman disease in the spleen of a pediatric patient:A case report

BACKGROUND Rosai–Dorfman disease(RDD)is a rare histiocytic proliferation of unknown etiology commonly found in children and adolescents.The common manifestation of RDD is massive and painless bilateral cervical lymphadenopathy with extranodal disease.While extranodal involvement in RDD is common,the spleen is an infrequent site of disease.CASE SUMMARY We report a 10-mo-old female infant with RDD presenting multiple splenic masses without cervical lymphadenopathy.She had fever,and blood tests showed leukocytosis,anemia,and elevated erythrocyte sedimentation rate and Creactive protein.Ultrasound,computed tomography,and magnetic resonance images demonstrated multiple splenic masses.Despite antibiotic therapy,her symptoms were not relived.She underwent diagnostic splenectomy and was discharged with recovery.CONCLUSION In pediatric patients with refractory infectious symptoms or hematological abnormalities,clinicians should suspect RDD,even in patients without significant lymphadenopathy.

FE Dynamic Analysis Using Moving Support Element on Multi-Span Beams Subjected to Support Motions

In the present study, finite element dynamic analysis or time history analysis of two-span beams subjected to asynchronous multi-support motions is carried out by using the moving support finite element. The elemental equation of the element is based on total displacements and is derived under the concept of the quasi-static displacement decomposition. The use of moving support element shows that the element is very simple and convenient to represent continuous beam moving, deforming and vibrating simultaneously due to support motions. The comparison between the numerical results and analytical solutions indicates that the FE result agrees with the analytical solution.