The swine surgical expermental study of laser-assisted liposuction / 中华整形外科杂志

<p><b>OBJECTIVE</b>To evaluate the advantage and disadvantage of laser-assisted liposuction compared with conventional liposuction.</p><p><b>METHODS</b>Ten swines were devided into three groups, the laser liposuction group, conventional liposuction group and control group. We compared the two surgical groups with the following aspects: ecchymosi, edema, lipocrit study, hemoglobin studies and blood biochemical changes, etc.</p><p><b>RESULTS</b>There is a benefit of laser-assisted liposuction in the following aspects such as ecchymosi, edema, lipocrit and postoperative complications. The two aspects, that is, ecchymosi and lipocrit study was statistically significant. Hemoglobin change was not statistically significant between the two groups. Laser-assisted liposuction did not lead to dysfunction of organs such as liver and kidney.</p><p><b>CONCLUSIONS</b>Laser-assisted liposuction can significantly decrease the blood lose, ecchymosis and edema compared with conventional liposuction, and it did not give rise to dysfunction of organs.</p>

Study on the collagen constitution of hyperplastic scar in different ages and its influencing factors / 中华烧伤杂志

<p><b>OBJECTIVE</b>To investigate the collagen constitution of hyperplastic scar (HS) in different ages and the change of relative factors.</p><p><b>METHODS</b>Thirty cases with HS were divided into two groups according to patients' age: group 1 (1 - 19 years, A) and group 2 (20 - 50 years, B). The normal skin (NS) from corresponding age of volunteers was employed as control group. The changes in TGFbeta1, collagenase (MMP-1) and tissue inhibitor of metalloproteinase (TIMP-1beta) and the collagen ratio were observed by means of in situ hybridization technique and SABC (Strept-Avidin-Biotin complex) immunohistochemistry and image analysis.</p><p><b>RESULTS</b>The ratio of type I to type III collagen in A group was 6.48 in average and 3.76 in B group, but there was no evident difference in the ratio during the disease process in both groups. The expression of TGFbeta1 in A group was much higher than that in B group (P < 0.01). The TIMP-1 mRNA expression showed no difference among all age groups in HS patients, but it was much higher than that in NS group. The MMP-1 expression was evidently lower than TIMP-1 expression, and there was no difference in MMP-1 expression compared with NS group.</p><p><b>CONCLUSION</b>(1) The TGFbeta1 expression in HS patients was negatively correlated with age, and the increased expression of TGFbeta1 produced an increase ratio of type I to type III collagen. (2) High level expression of TIMP-1 led to the formation of HS by inhibiting MMP-1 expression, and the expression was not related to age.</p>