Therapeutic alternatives for the treatment of infected pancreatic necrosis: an overview / Alternativas terapéuticas para el tratamiento de la necrosis pancreática infecciosa: una visión general

Despite diagnostic and therapeutic advances, the treatment of infected pancreatic necrosis (IPN) continues to be a complex problem to solve. The aim of this study is to evaluate the effectiveness of different surgical alternatives for the treatment of IPN. Articles published between 2000 to 2013, and related to effectiveness of open surgery (OS) and minimally invasive treatmente (MIT) in patients with IPN were evaluated. PubMed, MEDLINE, The Cochrane Database of Systematic Reviews, Cochrane Central Register RCT, DARE, IBECS, SciELO, LILACS, PAHO, WHOLIS, ASERNIP-S, NIHR, HTA, Clinical Excellence, York Health Economic Consortium and Tripdatabase were reviewed, searching systematic reviews (SR), randomized clinical trials (RCT) and observational studies (OST), in which the effectiveness of OS and MIT was evaluated in relation to the variables mortality, intra-abdominal bleeding, development of enterocutaneous fistula or hollow viscera perforation, development of pancreatic fistula, reoperations for complications, reoperations for new necrosectomy, development of diabetes mellitus and pancreatic enzyme requirements. Three hundred eighty-nine articles were retrieved, 10 of which met the selection criteria (2 SR, 1 RCT and 7 OST). The studies have a level of evidence of 2a, 2b, 3a and 4. MIT are associated with better results than OS in all variables analyzed, but significantly only in the development of diabetes mellitus and pancreatic enzyme requirement. Articles found are few and heterogeneous, making meaningful conclusions difficult. Studies with a better level of evidence, methodological quality and population size are needed to make conclusions and recommendations.

A pesar de los avances diagnósticos y terapéuticos, el tratamiento de la necrosis pancreática infecciosa (NPI) sigue siendo un problema complejo de resolver. El objetivo de este estudio es evaluar la eficacia de las diferentes alternativas quirúrgicas para el tratamiento del NPI. Fueron evaluados artículos publicados entre 2000 y 2013, relacionados con la efectividad de la cirugía abierta (CA) y el tratamiento mínimamente invasivo (TMI) en pacientes diagnosticados con NPI. Se PubMed, MEDLINE, The Cochrane Database of Systematic Reviews, Cochrane Central Register RCT, DARE, IBECS, SciELO, LILACS, PAHO, WHOLIS, ASERNIP-S, NIHR, HTA, Clinical Excellence, York Health Economic Consortium y Tripdatabase, en búsqueda de revisiones sistemáticas (RS), ensayos clínicos aleatorios (ECA) y estudios observacionales (EO). En estos estudios se evaluó la eficacia de la cirugía y el TMI en relación con diferentes variables, como la mortalidad, el sangrado intra-abdominal, el desarrollo de fístula enterocutánea o la perforación de víscera hueca, el desarrollo de fístula pancreática, reintervenciones por complicaciones, reintervenciones por necrosectomía, el desarrollo de diabetes mellitus y la necesidad de enzimas pancreáticas. Se consiguieron 389 artículos, de los cuales 10 cumplieron con los criterios de selección (2 RS, 1 ECA y 7 EO). Los estudios presentaron un nivel de evidencia de 2a, 2b, 3a y 4. El TMI se asocia con mejores resultados que la CA en todas las variables analizadas, pero en forma significativa sólo en el desarrollo de la diabetes mellitus y la necesidad de enzimas pancreáticas. Los artículos encontrados son pocos y heterogéneos, lo que hace difícil poder alcanzar conclusiones significativas. Se necesitan estudios con un mejor nivel de evidencia, calidad metodológica y tamaño de población estudiada para poder establecer conclusiones y recomendaciones.

Experimental model of severe acute pancreatitis in rabbits

PURPOSE: To develop an experimental model of severe acute pancreatitis in rabbits through a pancreatic ductal injection of sodium taurocholate. METHODS: Twenty-four albino rabbits of the New Zealand lineage were distributed into four groups of six animals (A, B, C and S). The rabbits of three experimental groups (A, B and C) were submitted to a laparatomy and received a pancreatic ductal injection of 1ml/kg sodium taurocholate 5 percent. Also, they were submitted to further laparatomies after 4h, 8h and 12h, respectively. The control group (S) was subdivided into two groups of three animals: in subgroup S1 only the pancreatic duct catheterization was performed whereas in subgroup S2 the pancreatic duct catheterization as well as an injection of 1ml/kg physiologic solution 0.9 percent were carried out. After 12 hours, the rabbits were evaluated. In the re-intervention, blood was collected to determine the amylasemia and a pancreatectomy was carried out to investigate interstitial infiltration, steatonecrosis and necrosis of the organ, using an optical microscope. RESULTS: There was an elevation of amylase in all groups thus proving the existence of acute pancreatitis. The size of the interlobular septum increased progressively with a greater variation between group S1 (0.13) and group C (0. 53) (p=0.035). While all the animals in group A exhibited focal cellular necrosis, it was more intense in the rabbits of group B and culminated with a high proportion of severe pancreatic necrosis in group C animals. The difference in the intensity of cellular necrosis showed statistic significance (p=0.001). CONCLUSION: The proposed experimental model demonstrated its reproducibility and effectiveness in producing severe acute pancreatitis in rabbits.

OBJETIVO: Desenvolver modelo experimental de pancreatite aguda grave em coelhos por meio da injeção de taurocolato de sódio no ducto pancreático. MÉTODOS: Vinte e quatro coelhos albinos da linhagem Nova Zelândia foram distribuídos em quatro grupos de seis animais (A, B, C e S). Os coelhos dos três grupos experimentais (A, B e C) foram submetidos a laparotomia e injetou-se taurocolato de sódio a 5 por cento, 1ml/Kg no ducto pancreático. Realizou-se nova laparotomia, respectivamente, após 4h, 8h e 12h. No grupo controle (S), subdividido em dois grupos de três animais, foi realizada no subgrupo S1 apenas cateterização do ducto pancreático e no subgrupo S2 cateterização do ducto pancreático e injeção de solução fisiológica 0,9 por cento, 1ml/Kg. Estes animais foram reavaliados após 12 horas. Na reintervenção coletou-se sangue para determinação da amilasemia e realizou-se pancreatectomia para análise histológica do infiltrado intersticial, da esteatonecrose e da necrose do órgão. RESULTADOS: Houve elevação da amilase em todos os grupos, demonstrando a presença da pancreatite aguda. O tamanho do septo interlobular aumentou progressivamente, observando-se maior diferença entre os grupos S1 (0,13) e C (0,53) (p=0,035). Todos os animais do grupo A apresentaram necrose celular focal que se tornou mais intensa nos coelhos do grupo B, culminando com o predomínio de necrose pancreática acentuada nos animais do grupo C. A diferença na intensidade da necrose celular apresentou significância estatística (p=0,001). CONCLUSÃO: O modelo experimental proposto se mostrou reprodutível e efetivo em provocar pancreatite aguda grave em coelhos.