Analysis of the healing process of the wounds occurring in rats using lasertherapy in association with hydrocolloid

To evaluate wound healing in rats by using low-level laser therapy (LLLT) associated with hydrocolloid occlusive dressing . METHODS: Forty male, adult, Wistar rats were used, distributed into four groups: LG (received 2 J/cm² of laser therapy); HG (treated with hydrocolloid); LHG (treated with 2 J/cm² of laser therapy and hydrocolloid); and the CG (treated with 1 mL of 0.9% saline). The wound was evaluated at pre-determined periods 3rd and 7th days, considering the macroscopic and histological parameters (inflammatory cells, capillary neoformation, fibroblasts, collagen formation and reepithelialization). RESULTS: The LG group at seven days showed increased collagen formation, the LHG group at 3 days showed mild collagen formation. The HG group and the CG at 7 days showed complete reepithelialization. CONCLUSION: Low-level laser therapy as well as the hydrocolloid dressing have favored the wound-healing process in rats.(AU)

Effects of oxygen in lungs of rats

PURPOSE: To analyze microscopically the effects of different concentrations of oxygen in the lungs of rats. METHODS: There were 20 rats distributed in three experimental groups (concentration of oxygen to 40%, 70% and 100%) and a control group. The animals were exposed to the oxygen in a chamber of acrylic during three days and after exposition, the animals were submitted to median thoracotomia to remove the lungs. The lung tissue of all of the animals was analyzed as regards presence of acute and chronic inflammation, capillary congestion, alveolar walls thick, interstitial and alveolar edema, alveolar hemorrhage, denudation capillary and alveolar endothelium areas and atelectasis. RESULTS: The analysis histopathologic revealed significant statistics difference for acute and chronic inflammation, capillary congestion, alveolar walls thick, interstitial and alveolar edema, alveolar hemorrhage, denudation capillary and alveolar epithelium areas. CONCLUSIONS: Exposition to the oxygen during 72 hours in the concentration of 40% does not produce significant histopathologic alterations in the lung tissue; in the concentration of 70%, can promotes the alveolar walls thick and capillary congestion and in the concentration of 100% can cause death and originate diffuse pulmonary lesion.(AU)

Evaluation of the use of raw extract of Euphorbia tirucalli L. in the healing process of skin wounds in mice

PURPOSE: To evaluate the effects of crude extract of Euphorbia tirucalli in cutaneous wound healing. METHODS: A total of 20 Swiss mice were randomly divided into two groups, aveloz (GA) and control (CG), and each group was further divided into two subgroups based on the deaths scheduled for the 7th and 14th days after surgery. The animals underwent a resection of cutaneous fragment with 1cm in diameter on the dorsum; the GA was applied in each animal on the subsequent days, 0.1 mL (30 mg/mL) hydroalcoholic extract of Euphorbia tirucalli was applied on the wound, while the same volume of 0.9% saline solution was applied to the GC. It was evaluated the lesion diameter and after programmed death, a surgical specimen was resected for histopathology. RESULTS: In the macroscopic analysis, no statistically significant difference was observed (p = 0.120 and p = 0.186, for the 7th and 14th days of death, respectively). The histological evaluation revealed no statistically significant difference in the variables acute inflammation (p = 0.014) and fibrosis (p = 0.018), when compared the group aveloz with the control group on day 14. CONCLUSION: The crude hydroalcoholic extract of Euphorbia tirucalli L. demonstrated better outcomes in the healing process, acute inflammation and fibrosis on the 14 day postoperatively.(AU)

Use of 2-octyl cyanoacrylate adhesive in rat liver induced lesion / Uso adesivo de 2-octil cianoacrilato em lesão induzida de fígado de ratos

PURPOSE: To evaluate the healing process of rat traumatic liver lesion corrected with the use of 2-octyl cyanoacrylate adhesive, compared to the use of biologically absorbable chromed catgut thread suture. METHODS: Thirty mail adult rats were divided into two groups (15 per group) according to the used method for liver lesion correction as follows: adhesive group (AG), and catgut group (CG); each group being divided into three subsets of five animals (7th, 14th, and 21st day), respectively, according to post-surgery evaluation. All animals were submitted to homogeneous lesion applying synthetic bonding to AG and using chromed catgut suture to CG for lesion correction. Macroscopic and microscopic parameters of healing processes were evaluated. RESULTS: Both groups of animals showed excellent abdominal wall healing, with no evidence of infection, and no abdominal cavity peritonitis or abscess. The presence of adherence was observed in both groups with no statistically significant difference. As to macroscopic evaluation, there was statistically significant difference with respect to specific factors of clinical inflammation (ischemic inflammation and giant celular inflammatory reaction) between animals evaluated on the 10th day (ischemic necrosis and giant celular inflammatory reaction) among animals evaluated on the 14th day (A14 versus C14). CONCLUSION: Applying 2-octyl-cyanoacrylate adhesive for correcting rat liver lesion does not change healing process when compared to the use of chromed catgut stitch.(AU)

OBJETIVO: Avaliar o processo de cicatrização de lesão induzida em fígado de rato utilizando adesivo de 2-octil cianoacrilato em comparação com a sutura com catgut cromado. MÉTODOS: Utilizou-se 30 ratos adultos, machos, distribuídos em dois grupos de 15 animais denominados de grupo adesivo (GA) e grupo catgut (GC); cada grupo foi dividido em três subgrupos, cada um com cinco animais, de acordo com a data marcada para avaliação pós-operatória (sétimo, décimo quarto e vigésimo primeiro dia). Todos os animais foram submetidos à lesão homogênea, aplicando o adesivo sintético no GA e utilizando sutura com catgut cromado no GC para correção das lesões. Foram avaliados parâmetros de macroscópicos e microscópicos do processo de cicatrização. RESULTADOS: Em ambos os grupos os animais evoluíram com boa cicatrização da parede abdominal, sem evidência clínica de infecção, sem abscessos ou peritonite na cavidade abdominal; a presença de aderências foi observada em ambos os grupos sem diferenças estatisticamente significantes; quanto à avaliação microscópica só houve diferença estatisticamente significante quanto aos parâmetros específicos de inflamação crônica (necrose isquêmica e reação gigantocelular) entre os animais avaliados no décimo quarto dia (A14 vs. C14). CONCLUSÃO: O emprego de adesivo de 2-octil cianoacrilato na correção de lesão em fígado de rato não altera o processo de cicatrização quando comparado ao uso de sutura com fio de categute cromado.(AU)

Avaliação da ação da Aroeira (Schinus terebinthifolius Raddi) na cicatrização de feridas cirúrgicas em bexiga de ratos / Evaluation of the aroreira (Schinus terebinthifolius Raddi) in the healing process of surgical incision in the bladder of rats

OBJETIVO: Avaliar a ação cicatrizante do extrato hidroalcoólico da aroeira em bexigas de ratos.MÉTODOS: Foram utilizados 40 ratos machos da linhagem Wistar, divididos em dois grupos de 20, denominados grupo aroeira (GA) e grupo controle (GC). Todos foram submetidos à incisão abdominal mediana com cistotomia de 1 cm, seguida de cistorrafia em plano único com pontos separados de poliglactina 910 5-0 (Vicryl®). Após este procedimento, nos animais GA injetou-se 100mg por quilo de peso de extrato hidroalcoólico da aroeira na cavidade peritoneal e nos GC injetou-se 1 ml por quilo de peso de solução salina a 0,9% . Cada grupo foi dividido em dois sub-grupos de 10 animais de acordo com a data da morte: sub-grupo A3 e C3, sacrificados no 3º dia pós-operatório e sub-grupo A7 e C7, sacrificados no 7º dia. A parede, a cavidade abdominal e a sutura da bexiga foram avaliadas macroscopicamente. Amostras de tecido da bexiga foram retiradas e analisadas histologicamente, utilizando a coloração de Hematoxilina-Eosina (HE) e tricrômio de Masson.RESULTADOS: Na análise macroscópica observou-se infecção na incisão cirúrgica em três ratos do GC e em um do GA, e aderências peritoneais em 29 ratos do GC controle e 17 no GA. A avaliação microscópica mostrou processo inflamatório agudo mais severo no 3° (p=0,045) e no 7° dia (p=0,002). Evidenciou-se ainda diferença estatística nos parâmetros utilizados para a avaliação histológica da cicatrização da bexiga nas variáveis colagenização (p = 0.001), reepitelização (p = 0,046) e neoformação (p = 0) nos subgrupos GC e GA no 3º dia e na variável neoformação vascular (p=0,001) no subgrupo do 7º dia.CONCLUSÃO: O uso de extrato hidroalcoólico de aroeira mostrou efeito cicatrizante favorável nas cistotomias em ratos. (AU)

PURPOSE: To evaluate the hydroalcoholic aroeira extract in the healing process of surgical incisions in the bladder of rats in an experimental comparative study.METHODS: Forty male Wistar rats were used. All of them underwent a median abdominal incision, with an 1cm cistotomy, followed by one plan suture with separated stitches of poliglactine 910 5-0. The animals were then divided into two groups of 20 rats each, and named the aroeira group (GA) and the control group (GC). In the first one, 80% hydro-alcoholic plant extract was injected in the peritoneal cavity, in a one dose of 100mg/kg. The second group, a 0.9% saline solution was injected in place of aroeira extract. Each group was divided into two subgroups (SGA and SGC) of 10 animals. According to their scheduled death, they were named subgroups SGA3 and SGC3 when killed in the 3th day after surgery and subgroups SGA7 and SGC7 in the 7th day. The abdominal cavity and the bladder suture were macroscopically evaluated.RESULTS: The microscopic analysis of the surgical incision in the bladder was performed by means of the hematoxilin-eosine stain and the trichrome of Masson. The macroscopic analysis showed an infection in the surgical incision in three rats of the SGC group and in one of the SGA, and peritoneal adhesion in the 26 rats belonging nine to SGC and 17 in the SGA. The microscopic evaluation revealed a more severe acute inflammation process in the SGC on the 3th (p=0.045) and in the 7th (0=0.002) days. In the SGA, a more significant colagenization (p=0.001) could be seen, as far as the evidence of vascular neoformation (p=0.002) on the 3th day. Chronic inflammatory reaction (p=0.006) and a more intense vascular neoformation (p=0.001) were observed in the 7th day.CONCLUSION: The hydroalcoholic aroeira extract have a favorable effect in the healing process of cystotomies done in rats. (AU)

Avaliação do extrato de Aroeira (Schinus terebinthifolius Raddi) no processo de cicatrização de gastrorrafias em ratos / Evaluation of the aroeira (Schinus terebinthifolius Raddi) extract on the healing process of gastroraphy in rats

OBJETIVO: Avaliar a cicatrização de ferida provocada no estômago de ratos com uso do extrato hidroalcoólico de aroeira (Schinus terebinthifolius Raddi). MÉTODOS: Foram utilizados 40 ratos, adultos, machos, divididos em dois grupos de vinte, denominados: grupo aroeira e grupo controle, cada grupo foi dividido em dois subgrupos de dez animais conforme o momento das mortes (três e sete dias). Em cada animal foi realizado o mesmo procedimento cirúrgico, ou seja, lesão do estômago e rafia com fio polipropileno (Prolene®) 6-0, diferindo apenas que os animais do grupo aroeira receberam dose única de 100mg/kg do extrato hidroalcóolico via intraperitoneal no dia do procedimento e aqueles do grupo controle a mesma quantidade em mililitros de solução salina isotônica. Os parâmetros avaliados foram: alterações macroscópicas, teste de resistência à insuflação de ar atmosférico e alterações microscópicas durante a evolução pós-operatória. RESULTADOS: Todos os animais demonstraram boa cicatrização da parede abdominal, sem sinais clínicos de infecção ou deiscência, isentos de complicações como abscessos e peritonites; ambos os grupos apresentaram aderências à superfície das gastrorrafias com órgãos vizinhos, principalmente com fígado, intestino delgado e parede abdominal. O teste de resistência não mostrou diferença estatisticamente significante nos grupos estudados. A análise microscópica evidenciou somente a inflamação crônica como possuidora de diferença significativa entre os grupos aroeira e controle no 3º dia de observação. CONCLUSÃO: O extrato hidroalcoólico de aroeira não alterou o processo de cicatrização do estômago quanto à avaliação macroscópica, tensiométrica e microscópica.(AU)

PURPOSE: To evaluate the healing process of gastric suture in rats using hydroalcoholic aroeira (Schinus terebinthifolius Raddi) extract. METHODS: Forty adult male rats, divided into two groups of 20 animals were operated and named as follows: aroeira group (Ga), and the control group (Gc). Each group was divided into two subgroups (SG) of 10 animals (SGa and SGc) according to the time of provoked death (three and seven days). The same surgical procedure was performed in all animals consisting in incision and simple suture of the stomach (Prolene® 6-0). The only difference was on the type of medical treatment. The aroeira group received a single 100mg/kg of aroira extract in an intraperitoneal dose and the animals from the control group received the same quantity in milliliters (ml) of the isotonic saline solution. The evaluated parameters were: macroscopic alterations, microscopic healing process and toleration to atmospheric air insufflation. RESULTS: All animals had good healing process of abdominal wall with no clinical evidence of infection, dehiscence, abscesses and peritonitis. Both groups presented adherences to gastric suture line area with surrounding organs, mainly the liver, lower intestines and the abdominal wall. Microscopic analysis showed only chronic inflammation significant difference between the aroeira and control groups on the third day of observation. Resistance tests did not present significant statistical differences in the studied groups. CONCLUSION: The use of aroeira (Schinus terebinthifolius Raddi) hydro-alcoholic extract did not alter the stomach healing process, considered on macroscopic, tensiometric and microscopic assessment.(AU)