Pazzini J.M., Serafim E.L., Gärtner F., Amorim I., Faria F., Rêma A., Moraes P.C. & De Nardi A.B. 2017. Histochemical and immunohistochemical evaluation of angiogenesis in rabbits (Oryctolagus cuniculus) submitted to skin grafts associated with platelet-rich plasma. Pesquisa Veterinária Brasileira 37(12):1519-1525. Histochemical staining consists of a set of specific chemical reactions of structures or tissueendogenous substances. Immunohistochemistry allows verification of proteins in tissues related to biological and pathological factors. The standardization of methods to assess angiogenesis resulting from formation of new blood vessels in procedures with sti mulants is important to facilitate the implementation of research as well as to assist inter pretation of data. In rabbits some markers of angiogenesis antibodies in the skin are not standardized because of crossreactions that may occur because the antibodies are made from such animals.The aim of this study was to analyze the immunohistochemical metho ds through dyes and immunohistochemical markers angiogenesis in rabbits (Oryctolagus cuniculus) having undergone reconstructive surgery with skin grafts associated with plas ma angiogenesis stimulator rich in platelets, in order to evaluate which method would be better to visualize the vessels, as well as to evaluate which antibody would promote better immunostaining, and find the differences between the methods and to standardize the me thodology to be applied in experiments using rabbits. Sixteen rabbits were used, split into two groups of eight animals: Gprp (plasma rich in platelets) and Gc (control, saline solution, 9%). The same technique of reconstructive surgery using graft mesh was performed on each rabbit. The groups differed only in the application of plateletrich plasma before the surgical wound synthesis. Samples for evaluation of angiogenesis were collected 15 days after the surgical procedure. The dyes Hematoxylin & Eosin and Masson's Trichrome were used in the histochemical study to evaluate vascular proliferation. Markers CD31, CD34 and Caveolin1 was used for the immunohistochemical study. The evaluation between the groups (Gprp and Gc) in regard to the categorical variable (vascular proliferation intensity) used the KruskalWallis test with p values equal to or less than 0.05 being considered sig nificant. The immunohistochemistry was subjected to analysis of variance for a completely randomized design, with two groups and five repetitions (medium) and 5% significance 1

The aim of this study was to evaluate of the efficacy of PRP employment associated with surgical sponges to improve the integration of the graft in the recipient bed. It was held at the Veterinary Hospital UNESP, Campus of Jaboticabal - SP, a study of 64 rabbits, divided into eight groups with eight animals. The groups were divided in control with saline solution 0,9%, control with PRP both without the sponge, surgical sponge with PRP, surgical sponge without PRP, and were used mesh and layer grafts in the respective groups. The data were submitted to statistical analysis (paired t-test, Kruskal-Wallis test, with subsequent use of the multiple comparison tests of Dunn, analysis of variance (F) test, Tukey test, P< 0.05). Edema and exudate with 3 and 3 and 7 days (P= 0,03 e P= 0,0049); coloring on the 14th day (P= 0,0001); cosmetic appearance on the 7th and 14th day (P= 0,0026 and P= 0,0001); mononuclear cells (P= 0,01) and polymorphonuclear (P= 0,01); fibroblast proliferation (P= 0,01); collagenous (P= 0,05); hemorrhage (P-007); necrosis and re-epithelialization (P= 0,2928 and P= 0,1). We concluded that the use of Platelet Rich Plasma Gel on skin grafts associated with a sponge as a compressive dressing promote the skin graft survival without a previous granulation tissue.

Skin graft is one of the techniques used to reconstruct surgical wounds. The graft is composed of epidermal and dermal segments that are completely removed from the donor region and transferred to the recipient bed. After its implantation it's recommended to make compressive dressing in the receiver bed. Since the grafts do not have a vascular pedicle, it's important to make the compressive dressing to improve graft contact with the wound and allow adequate angiogenesis. The compressive dressing is made with a sponge or foam, which offers adequate protection and reduces the discomfort of the patient in the postoperative period. The use of platelet-rich plasma (PRP) is the objective of several studies associated with the reduction of postoperative surgical complications, especially necrosis. This product is a result of the centrifugation of the patient's blood that promotes the separation of its constituents and allows the extraction of plasma with higher concentration of platelets. PRP improves the tissue healing process by releasing biological mediators and growth factors at the site of application. Researches on platelet-rich plasma used in reconstructive surgery are important because this product has therapeutic characteristics to promote healing. When it's used in skin grafts, platelet-rich plasma is able to improve graft integration in the recipient bed, and reduce necrosis after the surgical procedure. The use of postoperative surgical sponges associated with platelet-rich plasma is indicated to improve the healing of the graft and to avoid its displacement of the recipient bed.

The use of tumescent anesthesia with lidocaine can provide better intra- and postoperative analgesia that would benefit extensive reconstructive surgery. However, lidocaine can interfere with the healing process. Therefore, this study aimed to assess the local interference of the healing of induced and closed skin defects in a geometric pattern associated with the use of tumescent anesthesia with lidocaine in rabbits. Furthermore, we assessed its influence on cardiorespiratory parameters and postoperative analgesia. This study included 27 rabbits divided into three groups: GC (without the use of tumescence), GS (use of tumescence with 0.9% NaCl solution), and GL (use of tumescent anesthesia with lidocaine). There was no statistically significant intergroup difference in any stage of the wound healing process on macroscopic evaluations, in the angiogenesis process, or in the process of collagenization and fibroblast deposition. There were significant differences in heart rate (lower in GL), respiratory rate (higher in GC), mean arterial pressure (higher in GL), and expired concentration of isoflurane (lower in GL). There was no significant intergroup difference in the von Frey filament test or the visual analog scale score used to evaluate postoperative analgesia. We concluded that tumescent anesthesia with lidocaine does not impair postoperative tissue repair. Its use features benefits such as reducing the volume of inhaled anesthetic, maintaining the anesthesia plan, stable heart and respiratory rates, and lower hypotension during the surgical procedure.