RESUMO

PURPOSE: To evaluate the effect of preoperative intravenous chemotherapy with 5-fluorouracil on liver regeneration in an experimental model of major hepatectomy in rats. METHODS: Wistar rats were divided into two groups of 20 animals each and submitted to 70% hepatectomy 24 h after intravenous injection of 5-fluorouracil 20 mg/kg (fluorouracil group, FG) or 0.9% saline (control group, CG). After hepatectomy, each group was subdivided into two subgroups of 10 animals each according to the day of sacrifice (24 h or 7 days). Liver weight during regeneration, liver regeneration rate using Kwon formula, and the immunohistochemical markers proliferating cell nuclear antigen (PCNA) and Ki-67 were used to assess liver regeneration. RESULTS: At early phase (24 h after hepatectomy) it was demonstrated the negative effect of 5-fluorouracil on liver regeneration when assessed by Kwon formula (p < 0.0001), PCNA analysis (p = 0.02). With regeneration process complete (7 days), it was possible to demonstrate the sustained impairment of chemotherapy with 5-fluorouracil on hepatocytes regeneration phenomenon when measured by Kwon formula (p = 0.009), PCNA analysis (p = 0.0001) and Ki-67 analysis (0.001). CONCLUSIONS: Preoperative chemotherapy with intravenous 5-fluorouracil negatively affected the mechanisms of liver regeneration after major hepatectomy in rats.

Assuntos

RESUMO

Video 1Magnetic compression anastomosis for the treatment of complete gastric outlet obstruction.

Assuntos

RESUMO

Purpose: To evaluate the effect of preoperative intravenous chemotherapy with 5-fluorouracil on liver regeneration in an experimental model of major hepatectomy in rats. Methods: Wistar rats were divided into two groups of 20 animals each and submitted to 70% hepatectomy 24 h after intravenous injection of 5-fluorouracil 20 mg/kg (fluorouracil group, FG) or 0.9% saline (control group, CG). After hepatectomy, each group was subdivided into two subgroups of 10 animals each according to the day of sacrifice (24 h or 7 days). Liver weight during regeneration, liver regeneration rate using Kwon formula, and the immunohistochemical markers proliferating cell nuclear antigen (PCNA) and Ki-67 were used to assess liver regeneration. Results: At early phase (24 h after hepatectomy) it was demonstrated the negative effect of 5-fluorouracil on liver regeneration when assessed by Kwon formula (p < 0.0001), PCNA analysis (p = 0.02). With regeneration process complete (7 days), it was possible to demonstrate the sustained impairment of chemotherapy with 5-fluorouracil on hepatocytes regeneration phenomenon when measured by Kwon formula (p = 0.009), PCNA analysis (p = 0.0001) and Ki-67 analysis (0.001). Conclusions: Preoperative chemotherapy with intravenous 5-fluorouracil negatively affected the mechanisms of liver regeneration after major hepatectomy in rats.

Assuntos

RESUMO

PURPOSE: To evaluate the effects of low-frequency electric stimulation on biomechanics following surgical treatment of the Achilles tendon in rats. METHODS: Forty-two rats were divided into two groups. One was given electric stimulation and the other was not. All were submitted to Achilles tenotomy and tenorrhaphy performed with a modified Kessler stitch. The experiment group underwent electric stimulation with 2 Hz, a nonpolarized current of 1 mA intensity for 14 days. The animals were euthanized at 2, 4 and 6 weeks for the biomechanical study. RESULTS: The work performed, that is, the tendon's capacity to absorb energy until rupture, was greater in the electrically stimulated group in the 2nd (p = 0.032) and in the 6th week (p = 0.010). The maximum tension, which is the capacity to support a load, was higher in the treated group in the 2nd (p = 0.030) and the 6th week (p = 024). These results indicate greater resistance of the electrically stimulated tendons. An analysis of the elastic module showed no differences. CONCLUSION: Low-frequency electric stimulation increased the resistance of the tendons at 2 and 6 weeks of evolution in rats.

Assuntos

RESUMO

BACKGROUND: Hepatectomies promote considerable amount of blood loss and the need to administrate blood products, which are directly linked to higher morbimortality rates. The blood-conserving hepatectomy (BCH) is a modification of the selective vascular occlusion technique. It could be a surgical maneuver in order to avoid or to reduce the blood products utilization in the perioperative period. AIM: To evaluate in rats the BCH effects on the hematocrit (HT) variation, hemoglobin serum concentration (HB), and on liver regeneration. METHODS: Twelve Wistar rats were divided into two groups: control (n=6) and intervention (n=6). The ones in the control group had their livers partially removed according to the Higgins and Anderson technique, while the rats in the treatment group were submitted to BCH technique. HT and HB levels were measured at day D0, D1 and D7. The rate between the liver and rat weights was calculated in D0 and D7. Liver regeneration was quantitatively and qualitatively evaluated. RESULTS: The HT and HB levels were lower in the control group as of D1 onwards, reaching an 18% gap at D7 (p=0.01 and p=0.008, respectively); BCH resulted in the preservation of HT and HB levels to the intervention group rats. BCH did not alter liver regeneration in rats. CONCLUSION: The BCH led to beneficial effects over the postoperative HT and serum HB levels with no setbacks to liver regeneration. These data are the necessary proof of evidence for translational research into the surgical practice. A) Unresected liver; B) liver appearance after the partial hepatectomy (1=vena cava; 2=portal vein; 3=hepatic vein; 4=biliary drainage; 5=hepatic artery).

Assuntos

RESUMO

Purpose: To evaluate the effects of low-frequency electric stimulation on biomechanics following surgical treatment of the Achilles tendon in rats. Methods: Forty-two rats were divided into two groups. One was given electric stimulation and the other was not. All were submitted to Achilles tenotomy and tenorrhaphy performed with a modified Kessler stitch. The experiment group underwent electric stimulation with 2 Hz, a nonpolarized current of 1 mA intensity for 14 days. The animals were euthanized at 2, 4 and 6 weeks for the biomechanical study. Results: The work performed, that is, the tendons capacity to absorb energy until rupture, was greater in the electrically stimulated group in the 2nd (p = 0.032) and in the 6th week (p = 0.010). The maximum tension, which is the capacity to support a load, was higher in the treated group in the 2nd (p = 0.030) and the 6th week (p = 024). These results indicate greater resistance of the electrically stimulated tendons. An analysis of the elastic module showed no differences. Conclusion: Low-frequency electric stimulation increased the resistance of the tendons at 2 and 6 weeks of evolution in rats.(AU)

Assuntos

RESUMO

ABSTRACT Background: Hepatectomies promote considerable amount of blood loss and the need to administrate blood products, which are directly linked to higher morbimortality rates. The blood-conserving hepatectomy (BCH) is a modification of the selective vascular occlusion technique. It could be a surgical maneuver in order to avoid or to reduce the blood products utilization in the perioperative period. Aim: To evaluate in rats the BCH effects on the hematocrit (HT) variation, hemoglobin serum concentration (HB), and on liver regeneration. Methods: Twelve Wistar rats were divided into two groups: control (n=6) and intervention (n=6). The ones in the control group had their livers partially removed according to the Higgins and Anderson technique, while the rats in the treatment group were submitted to BCH technique. HT and HB levels were measured at day D0, D1 and D7. The rate between the liver and rat weights was calculated in D0 and D7. Liver regeneration was quantitatively and qualitatively evaluated. Results: The HT and HB levels were lower in the control group as of D1 onwards, reaching an 18% gap at D7 (p=0.01 and p=0.008, respectively); BCH resulted in the preservation of HT and HB levels to the intervention group rats. BCH did not alter liver regeneration in rats. Conclusion: The BCH led to beneficial effects over the postoperative HT and serum HB levels with no setbacks to liver regeneration. These data are the necessary proof of evidence for translational research into the surgical practice.

RESUMO Racional: As hepatectomias compreendem considerável perda sanguínea e utilização de hemoderivados, o que diretamente estão relacionados com maior morbimortalidade. A hepatectomia hemoconservadora (HH) é modificação da técnica de oclusão vascular seletiva em hepatectomia. Ela pode ser alternativa cirúrgica para evitar ou diminuir o uso de hemoderivados no perioperatório. Objetivo: Avaliar os efeitos da HH sobre o volume globular (VG), concentração de hemoglobina (HB) e sobre a regeneração hepática em ratos. Métodos: Dois grupos de ratos Wistar foram constituídos: controle (n=6) e intervenção (n=6). Os do grupo controle foram submetidos à hepatectomia parcial de Higgins e Anderson e os do grupo Intervenção à HH. VG e HB foram medidos nos dias D0, D1 e D7. A relação peso do fígado/peso do rato foi calculada em D0 e D7. A regeneração hepática foi analisada qualitativamente e quantitativamente. Resultados: Houve diminuição dos níveis de VG e HB nos ratos do grupo controle a partir de D1, atingindo decréscimo de 18% em D7 (p=0,01 e p=0,008 respectivamente); a HH permitiu a manutenção dos níveis de VG e HB nos ratos do grupo intervenção. A HH não alterou a regeneração hepática. Conclusão: HH resultou em níveis maiores de VG e HB pós-operatórios sem alterar a regeneração hepática. Pode-se considerar estes dados como a prova necessária para a translação à pesquisa clinicocirúrgica.

Assuntos

RESUMO

Abstract Purpose: To evaluate the effects of low-frequency electric stimulation on biomechanics following surgical treatment of the Achilles tendon in rats. Methods: Forty-two rats were divided into two groups. One was given electric stimulation and the other was not. All were submitted to Achilles tenotomy and tenorrhaphy performed with a modified Kessler stitch. The experiment group underwent electric stimulation with 2 Hz, a nonpolarized current of 1 mA intensity for 14 days. The animals were euthanized at 2, 4 and 6 weeks for the biomechanical study. Results: The work performed, that is, the tendon's capacity to absorb energy until rupture, was greater in the electrically stimulated group in the 2nd (p = 0.032) and in the 6th week (p = 0.010). The maximum tension, which is the capacity to support a load, was higher in the treated group in the 2nd (p = 0.030) and the 6th week (p = 024). These results indicate greater resistance of the electrically stimulated tendons. An analysis of the elastic module showed no differences. Conclusion: Low-frequency electric stimulation increased the resistance of the tendons at 2 and 6 weeks of evolution in rats.

Assuntos

RESUMO

BACKGROUND: Endoscopic ultrasound training has a learning curve greater than the other endoscopic therapeutic techniques. One of the preclinical teaching methods is the use of ex vivo porcine models. AIM: To describe five ex vivo porcine models for training in therapeutic echoendoscopic procedures. MATERIALS AND METHODS: Using porcine digestive tract containing esophagus, stomach, duodenum, spleen, liver and gallbladder, five models for therapeutic echoendoscopy training were described. With other segments of the porcine pieces (such as the bladder, spleen segment and omentum segment) and with easily accessible materials (such as grape and ultrasound gel), lesions were simulated to be treated. These models were applied in the Hands on course at the IRCAD (Institut de recherche contre les cancers de l'appareil digestif) Barretos of 2017. Endoscopic equipment and instruments are the same as those used in clinical practice. RESULT: The models are easily reproducible and do not require exchange during the hands on course period. Endoscopic and echographic imaging and tactile sensitivity are similar to the real one. CONCLUSION: The models described in this study demonstrated to be realistic, easy to reproduce and allow repetition during the same session. However, comparative studies are necessary to verify the real impact on teaching.

Assuntos

RESUMO

Background: Endoscopic ultrasound training has a learning curve greater than the other endoscopic therapeutic techniques. One of the preclinical teaching methods is the use of ex vivo porcine models. Aim: To describe five ex vivo porcine models for training in therapeutic echoendoscopic procedures. Materials and methods: Using porcine digestive tract containing esophagus, stomach, duodenum, spleen, liver and gallbladder, five models for therapeutic echoendoscopy training were described. With other segments of the porcine pieces (such as the bladder, spleen segment and omentum segment) and with easily accessible materials (such as grape and ultrasound gel), lesions were simulated to be treated. These models were applied in the Hands on course at the IRCAD (Institut de recherche contre les cancers de l'appareil digestif) Barretos of 2017. Endoscopic equipment and instruments are the same as those used in clinical practice. Result: The models are easily reproducible and do not require exchange during the hands on course period. Endoscopic and echographic imaging and tactile sensitivity are similar to the real one. Conclusion: The models described in this study demonstrated to be realistic, easy to reproduce and allow repetition during the same session. However, comparative studies are necessary to verify the real impact on teaching

Racional: El entrenamiento de la ecoendoscopía tiene una curva de aprendizaje mayor que las demás técnicas endoscópicas terapéuticas. Uno de los métodos de enseñanza preclínica es el uso de modelos porcinosex vivos. Objetivo: Describir cinco modelos porcino sex vivo para entrenamiento de procedimientos ecoendoscópicos terapéuticos. Materiales y método: Utilizando el tracto digestivo porcino, que contiene esófago, estómago, duodeno, delgado, hígado y vesícula biliar, se han descrito cinco modelos para el entrenamiento de ecoendoscopía terapéutica. Con otros segmentos de la pieza porcina (como vejiga, segmento de delgado, bazo y omento) y con materiales de fácil acceso (como uva y gel de ecografía), se simularon lesiones a ser tratadas. Estos modelos se aplicaron en el curso Handsonenel IRCAD (Institut de recherche contre les cancers de l'appareil digestif) Barretos de 2017. Los aparatos e instrumentos endoscópicos son los mismos utilizados en la práctica clínica. Resultado: Los modelos forman de fácil reproducibilidad, no siendo necesario el cambio de la pieza porcina durante el período del curso Handson. La imagen endoscópica y ecográfica y la sensibilidad táctil son similares a la real. Conclusión: Los modelos descritos en este trabajo han demostrado ser realistas, de fácil reproducción y permiten repetición durante la misma sesión. Sin embargo, los estudios comparativos son necesarios para verificar el impacto real en la enseñanza

Assuntos

RESUMO

BACKGROUND: The double balloon enteroscopy is an important method for the endoscopic approach of the small bowel that provides diagnosis and therapy of this segment's disorders, with low complication rate. AIM: Analysis of patients undergoing double balloon enteroscopy. The specific objectives were to establish the indications for this method, evaluate the findings by the double balloon enteroscopy, analyze the therapeutic options and the complications of the procedure. METHODS: It is a retrospective analysis of 65 patients who underwent double balloon enteroscopy. RESULTS: Sixty-five procedures were performed in 50 patients, 63.1% were women and 36.9% were men. The mean age was 50.94 years. The main indication it was gastrointestinal bleeding, followed by abdominal pain and Crohn's disease. Most procedures were considered normal. Polyps were the most prevalent finding, followed by angioectasias and duodenitis. In 49.2% of the cases, one or more therapeutic procedures were performed, (biopsy was the most prevalent). There was only one case of acute pancreatitis, which was treated clinically. CONCLUSION: The enteroscopy is good and safe method for the evaluation of the small bowel, and its main indications are gastrointestinal bleeding and abdominal pain. It has low complications rates and reduces the necessity of surgery.

Assuntos

RESUMO

ABSTRACT Background: The double balloon enteroscopy is an important method for the endoscopic approach of the small bowel that provides diagnosis and therapy of this segment's disorders, with low complication rate. Aim: Analysis of patients undergoing double balloon enteroscopy. The specific objectives were to establish the indications for this method, evaluate the findings by the double balloon enteroscopy, analyze the therapeutic options and the complications of the procedure. Methods: It is a retrospective analysis of 65 patients who underwent double balloon enteroscopy. Results: Sixty-five procedures were performed in 50 patients, 63.1% were women and 36.9% were men. The mean age was 50.94 years. The main indication it was gastrointestinal bleeding, followed by abdominal pain and Crohn's disease. Most procedures were considered normal. Polyps were the most prevalent finding, followed by angioectasias and duodenitis. In 49.2% of the cases, one or more therapeutic procedures were performed, (biopsy was the most prevalent). There was only one case of acute pancreatitis, which was treated clinically. Conclusion: The enteroscopy is good and safe method for the evaluation of the small bowel, and its main indications are gastrointestinal bleeding and abdominal pain. It has low complications rates and reduces the necessity of surgery.

RESUMO Racional: A enteroscopia por duplo balão é importante método endoscópico para abordagem do intestino delgado, permitindo o diagnóstico e a terapêutica de afecções com baixa taxa de complicações. Objetivo: Análise de pacientes submetidos à enteroscopia por duplo balão, estabelecendo as indicações para realização do exame e seus achados, analisando a terapêutica realizada e observando as complicações decorrentes do procedimento. Métodos: Estudo retrospectivo de análise de 65 prontuários de pacientes submetidos à enteroscopia por duplo balão. Os dados foram armazenados em planilhas e foi realizada a análise estatística. Resultados: Foram 65 enteroscopias em 50 pacientes, sendo 63,1% mulheres e 36,9% homens, com média de idade de 50,94 anos. A principal indicação foi sangramento intestinal, seguida por dor abdominal e doença de Crohn. A maioria dos procedimentos foi considerada normal, sendo que o achado mais prevalente foram os pólipos, seguido por angioectasias e duodenites. Em 49,2% dos exames foi realizado algum procedimento terapêutico, sendo a biópsia o mais prevalente. Houve apenas um caso de complicação de pancreatite aguda. Conclusão: A enteroscopia por duplo balão é bom e seguro método para a avaliação do intestino delgado, possuindo como principais indicações o sangramento intestinal e a dor abdominal. Possui baixas taxas de complicações e, por meio de suas opções terapêuticas, diminui a necessidade de procedimentos cirúrgicos.

Assuntos

RESUMO

ABSTRACT Background: Models for endoscopic retrograde cholangiopancreatography training allow practice with an expert feedback and without risks. A method to rapidly exchange the papilla can be time saving and accelerate the learning curve. Aim: To demonstrate a newly method of rapid exchange papilla in ex-vivo models to teach retrograde cholangiopancreatography advanced procedures. Methods: A new model of ex-vivo papilla was developed in order to resemble live conditions of procedures as cannulation, papilotomy or fistula-papilotomy, papiloplasty, biliary dilatation, plastic and metallic stentings. Results: The ex-vivo model of papilla rapid exchange is feasible and imitates with realism conditions of retrograde cholangiopancreatography procedures. Conclusion: This model allows an innovative method of advanced endoscopic training.

RESUMO Racional: Nas últimas décadas os simuladores de colangiopancreatografia retrógrada tiveram grande evolução. Atualmente dispõem-se de vários métodos para realizar o treinamento minimizando os riscos de complicações e tornando a curva de aprendizagem muito rápida. Objetivo: Demonstrar uma variação dos modelos ex-vivos desenvolvidos para o treinamento avançado em colangiopancreatografia retrograda. Método: Foi criado um modelo ex-vivo simulando fatores e condições reais para o treinamento avançado de colangiopancreatografia retrograda como canulação, papilotomia, fistulotomia, papiloplastia e uso de próteses plásticas e metálicas. Resultados: Esse modelo ex-vivo, com a possibilidade de troca rápida da papila, mostrou-se viável e no treinamento simula condições muito próximas às reais. Conclusão: Neste modelo há grande inovação para o treinamento de novos endoscopistas em procedimento avançados na colangiopancreatografia retrógrada.

Assuntos

RESUMO

Teaching models in endoscopy are important tools to minimize risks derived from endoscopic procedures, taking into account that therapeutic endoscopy, also known as surgical endoscopy, has greatly developed during the last decade. This results from the fact that minimally invasive procedures present relevant contributions and promote more comfort to patients. In this context, ex vivo teaching models and virtual simulators are important tools to the safe acquisition of abilities. In this article, the Brazilian Society of Digestive Endoscopy presents and describes its first course of therapeutic ERCP and EUS in models of laboratory teaching.

Assuntos

RESUMO

Teaching models in endoscopy are important tools to minimize risks derived from endoscopic procedures, taking into account that therapeutic endoscopy, also known as surgical endoscopy, has greatly developed during the last decade. This results from the fact that minimally invasive procedures present relevant contributions and promote more comfort to patients. In this context, ex vivo teaching models and virtual simulators are important tools to the safe acquisition of abilities. In this article, the Brazilian Society of Digestive Endoscopy presents and describes its first course of therapeutic ERCP and EUS in models of laboratory teaching.

Los modelos de enseñanza en endoscopía son herramientas importantes para minimizar los riesgos de los procedimentos endoscópicos. En la última década la endoscopía terapéutica o también llamada endoscopía-quirúrgica, tuvo gran desarollo debido a que los procedimentos minimamente invasivos tienen mejores resultados para la calidad de vida del paciente. En este contexto, los modelos experimentales y animales son herramientas muy importantes para los alumnos. En este artículo de revisión y presentación, los miembros de la Sociedad Brasilera de Endoscopía Digestiva presentan el primer Curso Taller en Ecoendoscopía terapéutica y CPRE en el Congreso Nacional del 2015.

RESUMO

Background: Models for endoscopic retrograde cholangiopancreatography training allow practice with an expert feedback and without risks. A method to rapidly exchange the papilla can be time saving and accelerate the learning curve. Aim: To demonstrate a newly method of rapid exchange papilla in ex-vivo models to teach retrograde cholangiopancreatography advanced procedures. Methods: A new model of ex-vivo papilla was developed in order to resemble live conditions of procedures as cannulation, papilotomy or fistula-papilotomy, papiloplasty, biliary dilatation, plastic and metallic stentings. Results: The ex-vivo model of papilla rapid exchange is feasible and imitates with realism conditions of retrograde cholangiopancreatography procedures. Conclusion: This model allows an innovative method of advanced endoscopic training.

Racional: Nas últimas décadas os simuladores de colangiopancreatografia retrógrada tiveram grande evolução. Atualmente dispõem-se de vários métodos para realizar o treinamento minimizando os riscos de complicações e tornando a curva de aprendizagem muito rápida. Objetivo: Demonstrar uma variação dos modelos ex-vivos desenvolvidos para o treinamento avançado em colangiopancreatografia retrograda. Método: Foi criado um modelo ex-vivo simulando fatores e condições reais para o treinamento avançado de colangiopancreatografia retrograda como canulação, papilotomia, fistulotomia, papiloplastia e uso de próteses plásticas e metálicas. Resultados: Esse modelo ex-vivo, com a possibilidade de troca rápida da papila, mostrou-se viável e no treinamento simula condições muito próximas às reais. Conclusão: Neste modelo há grande inovação para o treinamento de novos endoscopistas em procedimento avançados na colangiopancreatografia retrógrada.

Assuntos

RESUMO

Análise de pacientes que foram submetidos à cirurgia bariátrica. Casuística e métodos- Foram analisados 92 pacientes que se submeteram a cirurgia bariátrica pelas técnicas Bypass Gástrico em Y de Roux, Scopinato e Mason, utilizando o "Bariatric Analysis and Reporting Outcome System". Resultado - Dos pacientes que se submeteram ao Bypass Gástrico em Y de Roux 95,4 por cento apresentaram resultado de "melhor" e 4,6 por cento de "não melhor"; na técnica de Scopinaro 93,8 por cento mostraram-se "melhor" e 6,4 por cento "não melhor"; e na de Mason foram 90 por cento "melhor" contra 10 por cento "não melhor". Com relação à qualidade de vida, a maioria dos pacientes encaixou-se no perfil de "muito melhor", "melhor" e o "mesmo" e uma minoria em "pior" e "muito pior", independente da idade, sexo e perda do excesso de peso dos pacientes. Conclusão - Em todas as técnicas cirúrgicas houve melhora nos aspectos psicossociais e físicos na grande maioria dos pacientes, porém, comparando os três tipos de cirurgia, o Bypass Gástrico em Y de Roux apresentou-se mais eficaz.

Assuntos