ABSTRACT BACKGROUND: The preoperative nutritional state has prognostic postoperative value. Tomographic density and area of psoas muscle are validated tools for assessing nutritional status. There are few reports assessing the utility of staging tomography in gastric cancer patients in this field. AIMS: This study aimed to determine the influence of sarcopenia, measured by a preoperative staging computed tomography scan, on postoperative morbimortality and long-term survival in patients operated on for gastric cancer with curative intent. METHODS: This retrospective study was conducted from 2007 to 2013. The definition of radiological sarcopenia was by measurement of cross-sectional area and density of psoas muscle at the L3 (third lumbar vertebra) level in an axial cut of an abdominopelvic computed tomography scan (in the selection without intravascular contrast media). The software used was OsirixX version 10.0.2, with the tool “propagate segmentation”, and all muscle seen in the image was manually adjusted. RESULTS: We included 70 patients, 77% men, with a mean cross-sectional in L3 of 16.6 cm2 (standard deviation+6.1) and mean density of psoas muscle in L3 of 36.1 mean muscle density (standard deviation+7.1). Advanced cancers were 86, 28.6% had signet-ring cells, 78.6% required a total gastrectomy, postoperative surgical morbidity and mortality were 22.8 and 2.8%, respectively, and overall 5-year long-term survival was 57.1%. In the multivariate analysis, cross-sectional area failed to predict surgical morbidity (p=0.4) and 5-year long-term survival (p=0.34), while density of psoas muscle was able to predict anastomotic fistulas (p=0.009; OR 0.86; 95%CI 0.76–0.96) and 5-year long-term survival (p=0.04; OR 2.9; 95%CI 1.04–8.15). CONCLUSIONS: Tomographic diagnosis of sarcopenia from density of psoas muscle can predict anastomotic fistulas and long-term survival in gastric cancer patients treated with curative intent.

RESUMO RACIONAL: O estado nutricional pré-operatório tem valor prognóstico pós-operatório. A densidade tomográfica e a área do músculo psoas é uma ferramenta validada para o estado nutricional. Existem poucos estudos avaliando a utilidade da tomografia de estadiamento em pacientes com câncer gástrico neste campo. OBJETIVOS: Determinar a influência da sarcopenia, medida por tomografia computadorizada de estadiamento pré-operatório, na morbimortalidade pós-operatória e sobrevida em longo prazo em pacientes operados de câncer gástrico com intenção curativa. MÉTODOS: Estudo retrospectivo de 2007 a 2013. A definição de sarcopenia radiológica foi pela medida da área (PA) e densidade do músculo psoas (PD) a nível de L3 (Terceira vertebra lombar), em um corte axial de tomografia computadorizada abdominopélvica (na seleção sem meio de contraste intravascular). O Software utilizado foi o OsirixX v 10.0.2, com a ferramenta “propagar segmentação”, ajustando manualmente todos os músculos vistos na imagem. RESULTADOS: Foram incluídos 70 pacientes, 77% homens, PA média em L3: 16,6 cm2 (desvio padrão+6,1), PD média em L3: 36,1 mean muscle density (desvio padrão+7,1). Os cânceres avançados foram de 86, 28,6% tinham células em anel de sinete, 78,6% necessitaram de gastrectomia total, a morbidade e mortalidade cirúrgica pós-operatória foi de 22,8 e 2,8%, respectivamente, a sobrevida global de 5 anos a longo prazo (SV5) foi de 57,1%. Na análise multivariada, PA falhou em prever morbidade cirúrgica (p=0,4) e sobrevida global de 5 anos (p=0,34), enquanto PD foi capaz de prever fístulas anastomóticas (p=0,009; OR 0,86; IC95% 0,76–0,96) e SV5 (p=0,04; OR 2,9; IC95% 1,04–8,15). CONCLUSÕES: O diagnóstico tomográfico de sarcopenia por desvio padrão é capaz de predizer fístulas anastomóticas e sobrevida a longo prazo em pacientes com câncer gástrico tratados com intenção curativa.

ABSTRACT BACKGROUND: The addition of endoscopic ablative therapy plus proton pump inhibitors or fundoplication is postulated for the treatment of patients with long-segment Barrett´s esophagus (LSBE); however, it does not avoid acid and bile reflux in these patients. Fundoplication with distal gastrectomy and Roux-en-Y gastrojejunostomy is proposed as an acid suppression-duodenal diversion procedure demonstrating excellent results at long-term follow-up. There are no reports on therapeutic strategy with this combination. AIMS: To determine the early and long-term results observed in LSBE patients with or without low-grade dysplasia who underwent the acid suppression-duodenal diversion procedure combined with endoscopic therapy. METHODS: Prospective study including patients with endoscopic LSBE using the Prague classification for circumferential and maximal lengths and confirmed by histological study. Patients were submitted to argon plasma coagulation (21) or radiofrequency ablation (31). After receiving treatment, they were monitored at early and late follow-up (5–12 years) with endoscopic and histologic evaluation. RESULTS: Few complications (ulcers or strictures) were observed after the procedure. Re-treatment was required in both groups of patients. The reduction in length of metaplastic epithelium was significantly better after radiofrequency ablation compared to argon plasma coagulation (10.95 vs 21.15 mms for circumferential length; and 30.96 vs 44.41 mms for maximal length). Intestinal metaplasia disappeared in a high percentage of patients, and histological long-term results were quite similar in both groups. CONCLUSIONS: Endoscopic procedures combined with fundoplication plus acid suppression with duodenal diversion technique to eliminate metaplastic epithelium of distal esophagus could be considered a good alternative option for LSBE treatment.

RESUMO RACIONAL: A adição de terapia ablativa endoscópica associado a inibidores da bomba de prótons ou fundoplicatura tem sido postulada para o tratamento de pacientes com esôfago de Barrett de segmento longo (EBSL), no entanto, essa conduta não evita o refluxo ácido/biliar nesses pacientes. A fundoplicatura com gastrectomia distal e gastrojejunostomia em Y de Roux (FGD-Y) foi proposta como procedimento de supressão de ácido, demonstrando excelentes resultados no seguimento a longo prazo. Não há relatos na literature com a combinação dessa estratégia terapêutica. OBJETIVOS: Determinar os resultados precoces e a longo prazo observados em pacientes com EBSL com ou sem dysplasia de baixo grau, submetidos a FGD-Y, combinado com terapia endoscópica. MÉTODOS: Estudo prospectivo incluindo pacientes com EBSL, empregando a classificação de Praga, sendo o comprimento circunferencial (C) e máximo (M) e confirmado por estudo histológico. Os pacientes foram submetidos à coagulação com plasma de argônio (CPA, 21 pacientes) ou ablação por radiofrequência (ARF, 31 pacientes). Após o tratamento, eles foram seguidos precoce e tardiamente (5–12 anos), mediante avaliação endoscópica e histológica. RESULTADOS: Foram observadas poucas complicações após o procedimento (úlcera ou estenose). Re-tratamento foi necessário em ambos os grupos de pacientes. A redução do comprimento do epitélio metaplásico foi significativamente melhor após ARF em comparação com CPA (10,95 versus 21,15 mm para C e 30,96 versus 44,41 mm para M). A metaplasia intestinal desapareceu em elevada porcentagem de pacientes, e os resultados histológicos a longo prazo foram bastante semelhantes em ambos os grupos. CONCLUSÕES: Procedimentos endoscópicos combinados com fundoplicatura e gastrectomia distal e gastrojejunostomia em Y de Roux, para eliminar o epitélio metaplásico do esôfago distal podem ser considerados uma boa opção alternativa para o tratamento da EBSL.

RESUMO - RACIONAL: Disfunção do esfíncter esofágico inferior (EEI), doença do refluxo gastroesofágico e esofagite erosiva em pacientes submetidos à gastrectomia subtotal são ocorrências comumente reconhecidas, mas até agora as causas permanecem obscuras. OBJETIVO: A hipótese deste estudo é que a gastrectomia subtotal provoque alterações na pressão de repouso do EEI e na sua competência, devido ao dano anatômico desta, visto que as fibras oblíquas “Sling”, um dos componentes musculares do EEI, são seccionadas durante este procedimento cirúrgico. MÉTODOS: Sete cães adultos sem raça definida (18-30 kg) foram anestesiados e submetidos à transecção do estômago proximal. Em seguida, o remanescente gástrico proximal foi fechado por sutura. No intraoperatório, manometria lenta foi realizada em cada cão, em condições basais (com estômago intacto) e no remanescente gástrico proximal fechado. A média dessas medidas é apresentada, com cada cão servindo como seu próprio controle. RESULTADOS: A pressão média do EEI medida no remanescente gástrico proximal, em comparação com a pressão do EEI no estômago intacto, foi diminuída em cinco cães, aumentada em um cão e sem alterações no outro cão. CONCLUSÃO: A secção transversa superior do estômago e o fechamento do remanescente do estômago por sutura provocam alterações na pressão do EEI. Sugerimos que essas mudanças na pressão do EEI são secundárias à secção das fibras oblíquas “Sling” do esfíncter, um de seus componentes musculares. A sutura e o fechamento do remanescente gástrico proximal, reancora essas fibras com mais, menos ou a mesma tensão, modificando ou não a pressão do EEI.

ABSTRACT - BACKGROUND: Dysfunction of the lower esophageal sphincter (LES), gastroesophageal reflux disease, and erosive esophagitis in patients undergoing subtotal gastrectomy are commonly recognized occurrences, but until now the causes remain unclear. AIM: The hypothesis of this study is that subtotal gastrectomy provokes changes on the LES resting pressure and its competence, due to the anatomical damage of it, given that the oblique “Sling” fibers, one of the muscular components of the LES, are transected during this surgical procedure. METHODS: Seven adult mongrel dogs (18-30 kg) were anesthetized and admitted for transection of the proximal stomach. Later, the proximal gastric remnant was closed by a suture. Intraoperatively, slow pull-through LES manometries were performed on each dog, under basal conditions (with the intact stomach), and in the closed proximal gastric remnant. The mean of these measurements is presented, with each dog serving as its control. RESULTS: The mean LES pressure (LESP) measured in the proximal gastric remnant, compared with the LESP in the intact stomach, was decreased in five dogs, increased in one dog, and remained unchanged in other dogs. CONCLUSION: The upper transverse transection of the stomach and closing the stomach remnant by suture provoke changes in the LESP. We suggested that these changes in the LESP are secondary to transecting the oblique “Sling” fibers of the LES, one of its muscular components. The suture and closing of the proximal gastric remnant reanchor these fibers with more, less, or the same tension, whether or not modifying the LESP.

Abstract Background: Helicobacter pylori is detected by pathogen recognition receptors including toll–like receptors (TLR) and nucleotide–binding oligomerization domain (NOD)–like receptors, eliciting an innate immune response against this bacteria. The aim of this study was to assess if polymorphisms of TLR2, TLR4, TLR5, NOD1 and NOD2 genes are associated with gastric cancer, in particular in individuals infected with H. pylori. Results: A case–control study of 297 gastric cancer patients and 300 controls was performed to assess the association of 17 polymorphisms. Analyses performed under the allele model did not find association with gastric cancer. However, NOD1 rs2075820 (p.E266K) showed association with intestinal–type gastric cancer among H. pylori infected subjects (OR = 2.69, 95% CI 1.41–5.13, p = 0.0026). The association was not statistically significant in diffuse–type gastric cancer cases (OR = 1.26, 95% CI 0.63–2.52, p = 0.51). When the analyses were performed in patients carrying H. pylori strains harboring the cag pathogenicity island (cagPAI), we noticed significant association with NOD1 rs2075820 (OR = 4.90, 95% CI 1.80–3.36, p = 0.0019), in particular for intestinal–type gastric cancer cases (OR = 7.16, 95% CI 2.40–21.33, p = 4.1 × 10−4) but not among diffuse–type gastric cancer cases (OR = 3.39, 95% CI 1.13–0.10, p = 0.03). Conclusions: NOD1 rs2075820 increases the risk of intestinal–type gastric cancer among individuals infected with H. pylori, particularly in those harboring the cagPAI.

RESUMO Racional: A identificação de fatores prognósticos do câncer de esôfago permitiu prever a evolução dos pacientes. Objetivo: Avaliar diferentes fatores prognósticos da sobrevida em longo prazo do câncer de esôfago e avaliar um novo fator prognóstico da sobrevida em longo prazo chamado índice linfoparietal (N+/T). Método: Estudo prospectivo do Hospital Clínico da Universidade do Chile, entre janeiro de 2004 e dezembro de 2013. Incluiu todas as operações de câncer de esôfago com intenção curativa e anastomose cervical. Os critérios de exclusão incluíram: câncer em estágio 4, ressecções R1, procedimentos paliativos e operações de emergência. Resultados: Cinquenta e oito pacientes foram incluídos, 62,1% eram homens, a idade média foi de 63,3 anos. Um total de 48,3% eram escamosos, 88% eram cânceres avançados, a colheita média de linfonodos foi de 17,1. A morbidade cirúrgica pós-operatória foi de 75%, com 17,2% de reoperações e 3,4% de mortalidade. A sobrevida global média foi de 41,3 meses, a sobrevida em três anos foi de 31%. A análise multivariada dos fatores prognósticos mostrou que variáveis significativas foram elevação pelo mediastinal anterior (p=0,01, OR: 6,7 [1,43-31,6]), fístula anastomótica (p=0,03, OR: 0,21 [0,05-0,87]), classificação N (p=0,02, OR: 3,8 [1,16-12,73]), estágio TNM (p=0,04, OR: 2,8 [1,01-9,26]) e índice linfoparietal (p=0,04, RR: 3,9 [1,01-15,17]. As curvas ROC do índice linfoparietal, classificação N e estádio TNM apresentam áreas abaixo da curva de 0,71, 0,63 e 0,64, respectivamente, com diferença estatística significativa (p=0,01). Conclusão: Os fatores prognósticos independentes de sobrevida em longo prazo no câncer de esôfago são a elevação mediastinal anterior, fístula anastomótica, classificação N, estágio TNM e índice linfoparietal. No câncer de esôfago, o novo índice linfoparietal é mais forte que o estágio TNM no prognóstico de sobrevida em longo prazo.

ABSTRACT Background: The identification of prognostic factors of esophageal cancer has allowed to predict the evolution of patients. Aim: Assess different prognostic factors of long-term survival of esophageal cancer and evaluate a new prognostic factor of long-term survival called lymphoparietal index (N+/T). Method: Prospective study of the Universidad de Chile Clinical Hospital, between January 2004 and December 2013. Included all esophageal cancer surgeries with curative intent and cervical anastomosis. Exclusion criteria included: stage 4 cancers, R1 resections, palliative procedures and emergency surgeries. Results: Fifty-eight patients were included, 62.1% were men, the average age was 63.3 years. A total of 48.3% were squamous, 88% were advanced cancers, the average lymph node harvest was 17.1. Post-operative surgical morbidity was 75%, with a 17.2% of reoperations and 3.4% of mortality. The average overall survival was 41.3 months, the 3-year survival was 31%. Multivariate analysis of the prognostic factors showed that significant variables were anterior mediastinal ascent (p=0.01, OR: 6.7 [1.43-31.6]), anastomotic fistula (p=0.03, OR: 0.21 [0.05-0.87]), N classification (p=0.02, OR: 3.8 [1.16-12.73]), TNM stage (p=0.04, OR: 2.8 [1.01-9.26]), and lymphoparietal index (p=0.04, RR: 3.9 [1.01-15.17]. The ROC curves of lymphoparietal index, N classification and TNM stage have areas under the curve of 0.71, 0.63 and 0.64 respectively, with significant statistical difference (p=0.01). Conclusion: The independent prognostic factors of long-term survival in esophageal cancer are anterior mediastinal ascent, anastomotic fistula, N classification, TNM stage and lymphoparietal index. In esophageal cancer the new lymphoparietal index is stronger than TNM stage in long-term survival prognosis.

RESUMO Racional: A cirurgia laparoscópica tem sido gradualmente aceita como opção para o tratamento cirúrgico do câncer gástrico. Ainda existem pontos controversos ou situações eventualmente associadas a dificuldades intra-operatórias ou complicações pós-operatórias. Objetivo: Estabelecer a relação entre as dificuldades durante a execução da gastrectomia total e a ocorrência de eventuais complicações pós-operatórias. Método: Foram revisados os protocolos operatórios e a evolução pós-operatória de 74 pacientes operados por câncer gástrico, submetidos à gastrectomia total laparoscópica (critérios de inclusão). Foram analisadas as dificuldades intraoperatórias registradas no protocolo operatório e as complicações pós-operatórias de natureza cirúrgica (critérios de inclusão). As complicações médicas pós-operatórias foram excluídas (critérios de exclusão). Para a discussão, foi realizada extensa revisão bibliográfica. Resultados: Dificuldades ou complicações intraoperatórias relatadas corresponderam a 33/74 e destas 18 (54,5%) foram relacionadas com complicações pós-operatórias e seis absolutamente inesperadas. As mais frequentes foram vazamentos da anastomose e do coto duodenal; no entretanto, outras complicações raras foram observadas. Sete foram tratados com medidas conservadoras e 17 (22,9%) necessitaram de re-exploração cirúrgica, com mortalidade pós-operatória de dois pacientes (2,7%). Conclusão: Aprendemos que existem complicações infrequentes e inesperadas; a equipe de tratamento deve estar atenta e diante da suspeita de complicação, decisão apropriada pode incluir uma nova exploração precoce. Finalmente, após a experiência relatada, algumas complicações devem ser evitadas.

ABSTRACT Background: Laparoscopic surgery has been gradually accepted as an option for the surgical treatment ofgastric cancer. There are still points that are controversial or situations that are eventually associated with intra-operative difficulties or postoperative complications. Aim: To establish the relationship between the difficulties during the execution of total gastrectomy and the occurrence of eventual postoperative complications. Method: The operative protocols and postoperative evolution of 74 patients operated for gastriccancer, who were subjected to laparoscopic total gastrectomy (inclusion criteria) were reviewed. The intraoperative difficulties recorded in the operative protocol and postoperative complications of a surgical nature wereanalyzed (inclusion criteria). Postoperative medical complications were excluded (exclusion criteria). For the discussion, an extensive bibliographical review was carried out. Results: Intra-operative difficulties or complications reported correspond to 33/74 and of these; 18 events (54.5%) were related to postoperative complications and six were absolutely unexpected. The more frequent were leaks of the anastomosis and leaks of the duodenal stump; however, other rare complications were observed. Seven were managed with conservative measures and 17 (22.9%) required surgical re-exploration, with a postoperative mortality of two patients (2.7%). Conclusion: We have learned that there are infrequent and unexpected complications; the treating team must be mindful of and, in front of suspicion of complications, anappropriate decision must be done which includes early re-exploration. Finally, after the experience reported, some complications should be avoided.

RESUMO Racional: A identificação de fatores prognósticos do câncer gástrico (GC) permitiu predizer a evolução dos pacientes. Objetivo: Avaliar a confiabilidade do índice linfoparietal na predição de sobrevida em longo prazo em pacientes tratados com intenção curativa. Método: Estudo prospectivo do Hospital das Clínicas da Universidade de Chile, entre maio de 2004 e maio de 2012. Todas as operações de câncer gástrico foram com intenção curativa. Os critérios de exclusão foram: gastrectomia por lesões benignas, cânceres estágio 4, ressecções R1, procedimentos paliativos, esofagogastrectomias completas e operações de emergência. Resultados: Foi incluído um total de 284 pacientes; da amostra 65,4% eram homens, com média de idade de 64,5 anos, 75% eram cânceres avançados, 72,5% necessitaram de gastrectomia total e 30 coletas de linfonodos. A morbimortalidade cirúrgica foi de 17,2% e 1,7%. Sobrevida em cinco anos foi de 56,9%. O índice N +/T pôde predizer a sobrevida em longo prazo em todos os subgrupos (p<0,0001), embora tivesse previsão confiável em GC precoce (p=0,005), GC avançado (p<0,0001), célula GC de anel de sinete (p< 0,0001), GC proximal (p<0,0001) e GC distal (p<0,0001). As curvas ROC N +/T, LNR e T apresentaram áreas abaixo da curva de 0,789, 0,786 e 0,790, respectivamente, sem diferença estatística significativa (p=0,96 ). Conclusão: O índice N +/T é um quociente confiável no prognóstico na avaliação de pacientes com adenocarcinoma gástrico que foram ressecados com intenção curativa.

ABSTRACT Background: The identification of prognostic factors of gastric cancer (GC) has allowed to predict the evolution of patients. Aim: Assess the reliability of the lymphoparietal index in the prediction of long-term survival in GC treated with curative intent. Method: Prospective study of the Universidad de Chile Clinical Hospital, between May 2004 and May 2012. Included all gastric cancer surgeries with curative intent. Exclusion criteria were: gastrectomies due to benign lesions, stage 4 cancers, R1 resections, palliative procedures, complete esophagogastrectomies and emergency surgeries. Results: A total of 284 patients were included; of the sample 65.4% were male,mean age of 64.5 years,75% were advanced cancers, 72.5% required a total gastrectomy, 30 lymph nodes harvest. Surgical morbidity and mortality were 17.2% and 1.7%. 5-year survival was 56.9%. The N+/T index could predict long-term survival in all de subgrups (p<0.0001), although had a reliable prediction in early GC (p=0.005), advanced GC (p<0.0001), signet ring cell GC (p<0.0001), proximal GC (p<0.0001) and distal GC (p<0.0001). The ROC curves N+/T index, LNR and T classification presented areas below the curve of 0.789, 0.786 and 0,790 respectively, without a significant statistical difference (p=0.96). Conclusion: The N+/T index is a reliable quotient in the prognostic evaluation of gastric adenocarcinoma patients who have been resected with curative intent.

Diabetes Mellitus (DM) and obesity are a public health problem in Chile. Bariatric surgery is the most effective treatment alternative to achieve a significant and sustained weight reduction in patients with morbid obesity. The results of controlled clinical trials indicate that, compared to medical treatment, surgery for obese patients with DM2 allows a better control of blood glucose and cardiovascular risk factors, reduces the need for medications and increases the likelihood for remission. Consensus conferences and clinical practice guidelines support bariatric surgery as an option to treat DM2 in Class III Obesity (Body Mass Index (BMI) > 40) regardless of the glycemic control and the complexity of pharmacological treatment and in Class II Obesity (BMI 35-39,9) with inadequate glycemic control despite optimal pharmacological treatment and lifestyle. However, surgical indication for patients with DM2 and BMI between 30-34.9, the most prevalent sub-group, is only suggested. The Chilean Societies of Endocrinology and Diabetes and of Bariatric and Metabolic Surgery decided to generate a consensus regarding the importance of other factors related to DM2 that would allow a better selection of candidates for surgery, particularly when weight does not constitute an indication. Considering the national reality, we also need a statement regarding the selection and characteristics of the surgical procedure as well as the role of the diabetologist in the multidisciplinary team.

RESUMO Racional: A necrose esofagogástrica completa após ingestão cáustica é um cenário cirúrgico desafiador para a reconstrução do trânsito digestivo alto. Objetivo: Apresentar uma técnica cirúrgica para reconstrução do trato digestivo superior após esofagectomia total e gastrectomia por necrose esofágica e gástrica. Método: O trânsito foi restabelecido por interposição faringo-íleo-cólica com anastomose arterial e venosa microcirúrgica com aumento do suprimento sanguíneo. Adicionalmente, anastomose colo-duodeno-anastomótica e íleo-transversa foram realizadas para reconstrução completa do trânsito digestivo. Resultado: Este procedimento foi aplicado em um homem de 41 anos com tentativa de suicídio pela ingestão de líquido cáustico alcalino (hidróxido de sódio concentrado). Ocorreu necrose total do esôfago e do estômago, o que exigiu inicialmente esofagogastrectomia total, fechamento ao nível do esfíncter cricofaríngeo e jejunostomia para alimentação enteral produzindo qualidade de vida altamente deteriorada. O procedimento foi realizado mais tardiamente e não houve maiores complicações pós-operatórias precoces e tardias e condições nutricionais normais foram restabelecidas. Conclusão: O procedimento é viável e deve ser manejado por equipe multidisciplinar a fim de restabelecer a qualidade de vida normal.

ABSTRACT Background : Complete esophago-gastric necrosis after caustic ingestion is a challenging surgical scenario for reconstruction of the upper digestive transit. Aim : To present a surgical technique for reconstruction of the upper digestive tract after total esophagectomy and gastrectomy due to esophageal and gastric necrosis Method: The transit was re-established by means of a pharyngo-ileo-colic interposition with microsurgical arterial and venous anastomosis for augmentation of blood supply. Colo-duodeno-anastomosis and ileo-transverse colic anastomosis were performed for complete digestive transit reconstruction. Result: This procedure was applied in a case of 41 years male attempted suicide by ingesting alkali caustic liquid (concentrated sodium hydroxide). Total necrosis of the esophagus and stomach occurred, which required initially total esophago-gastrectomy, closure at the level of the crico-pharyngeal sphincter and jejunostomy for enteral feeding with a highly deteriorated quality of life . The procedure was performed later and there were no major early and late postoperative complications and normal nutritional conditions were re-stablished. Conclusion: The procedure is feasible and must be managed by multidisciplinary team in order to re-establish a normal quality of life.

Introduction: The longevity of Chilean population has increased greatly in the last 25 years, similar to world population. Gastric cancer in Chile is the first cause of death due to malignant tumors. Purpose: To determine operative mortality of subtotal or total gastrectomy in patients with gastric cancer older than 80 years, and the rate 5 year-survival. Material and method: This is an retrospective-prospective study of all patients with 80 years of age or more submitted to gastric resection due to gastric cancer between 1988 and 2016. Patients submitted to non-resective procedures were excluded. The following parameters were analized: symptoms and signs, comorbidities, pathologic features of the gastric cancer, operative mortality according to the gastrectomy and 5-year survival rate. Results: There were 70 patients with gastric cancer older than 80 years of age, which represented 7.4% of all patients with gastric cancer submitted to gastric resection in the same period of time. Most frequent symptoms were epigastric pain, loss of weight and chronic microcitic anemia. There were 66% of the patients with comorbidities. The tumor was located mainly in the upper third of the stomach, being an adenocarcinoma in 66 patients (94%). There were also 2 linfomas, one GIST and one patient with a malignant carcinoid. Early cancer was observed in 12% of the adenocarcinomas. Global operative mortality was 17% being 5% for subtotal and 22% for total gastrectomy. Mean 5-year survival rate was 26%. Conclusions: Subtotal or total gastrectomy in patients with gastric cancer with 80 years of age or more is possible to perform in selected patients, but the risk of operative mortality is 7 to 10 times greater than below 75 years of age.

Introducción: La población chilena, al igual que la mundial, ha presentado un importante envejecimiento en los últimos 25 años. El cáncer gástrico ocupa la primera causa de mortalidad por tumores malignos en Chile. Objetivo: Determinar la mortalidad operatoria de la gastrectomía total o subtotal en pacientes con cáncer gástrico de 80 o más años y la sobrevida a 5 años. Material y método: Estudio retrospectivo y prospectivo de todos los pacientes sometidos a resección gástrica por cáncer gástrico entre 1988 y 2016, con 80 o más años. Se excluyeron los pacientes sometidos a técnicas quirúrgicas no resectivas. Se analizaron las siguientes variables: síntomas y signos, comorbilidades, características anatomopatológicas, mortalidad según el tipo de gastrectomía y sobrevida global a 5 años. Resultados: En el periodo de tiempo analizado hubo 70 pacientes con cáncer gástrico y edad igual o mayor de 80 años, que representan al 7,4% del total de pacientes con resección gástrica. Los síntomas más frecuentes fueron dolor, baja de peso y anemia crónica microcítica. Hubo un 66% de pacientes con comorbilidades. El cáncer se ubicó preferentemente en el tercio superior, siendo un adenocarcinoma en 66 pacientes. En 4 pacientes hubo 2 linfomas, un GIST maligno y un carcinoide maligno. El carcinoma incipiente correspondió al 12% de los adenocarcinomas. La mortalidad global de la gastrectomía fue del 17%, siendo el 5% para la subtotal y el 22% para la total. La sobrevida promedio a 5 años fue del 26%. Conclusiones: La gastrectomía subtotal o total en pacientes con cáncer gástrico sobre 80 años es factible de realizar en pacientes seleccionados, pero el riesgo de mortalidad operatoria es de 7 a 10 veces mayor que en pacientes bajo los 75 años.

Surgical site infections are frequent adverse events in surgery, its presence determines increased morbidity and mortality plus hospital stay and economic costs for those affected. Obesity is a risk factor for this disease by multifactorial aspects. Considering the Western epidemic overweight and obesity, as well as the massification of bariatric surgery, it is important to keep updated concepts. Obesity determines a state of basal systemic inflammatory response, which can be decompensated by a second hit, this decompensation can determine a higher rate of infections associated to surgery. There is evidence that fails to demonstrate statistical significance in relation to the presence of diabetes or H. pylori infection as a risk factor. As a complement, some paradigms as the highest rate of lung infections or the need for antibiotic prophylaxis use in bariatric surgery remains.

Las infecciones de sitio operatorio son eventos adversos frecuentes en cirugía, su presencia determina una mayor morbimortalidad, además de estancia hospitalaria y costos económicos para los afectados. La obesidad constituye un factor de riesgo para dicha enfermedad por aspectos multifactoriales. Considerando la epidemia occidental del sobrepeso y la obesidad, así como la masificación de la cirugía bariátrica, es importante mantener conceptos actualizados. La obesidad determina un estado de respuesta inflamatorio sistémico basal, el cual puede ser descompensado por segundas injurias, dicha descompensación puede determinar en una mayor tasa de infecciones asociadas a la intervención quirúrgica. Existe evidencia que no logra demostrar significación estadística con relación a la presencia de diabetes o H. pylori como factor de riesgo. De forma complementaria, algunos paradigmas como la mayor tasa de infecciones pulmonares o la necesidad de uso de antibiótico-profilaxis en cirugía bariátrica se mantiene.

Background: Plasma ghrelin levels may decrease after vertical sleeve gastrectomy, probably due to the excision of a large portion of the gastric fundus. It is worth exploring the long term effects of this surgical procedure on ghrelin levels and their associations with changes in body weight. Aim: To assess ghrelin levels and changes in body weight, one and five years after a vertical sleeve gastrectomy. Material and Methods: Plasma ghrelin was measured prior to gastric sleeve gastrectomy, immediately after surgery and BMI was controlled at one and five years of the postoperative period in 16 and 10 obese patients, respectively. Mean baseline body mass index was 40.4 ± 6 kg/m². Results: Ghrelin decreased in 10 patients and increased in six during the long term postoperative period. At one year, mean body mass index decreased to 25.1 ± 1.6 kg/m². Changes in weight and ghrelin levels had no relationship whatsoever. At five years of follow up, body mass index had increased to 29.9 ± 2.5 kg/m², again without any association with ghrelin levels. Conclusions: Ghrelin levels may decrease or increase after vertical sleeve gastrectomy and have no association with changes in body weight.

Background: Cyanoacrylate can be used for incision closure with better esthetical results, less pain and lower incidence of infections. However, it could have a lower resistance to tension. Aim: To compare tensile strength of wounds closed with a non reabsorbable monofilament suture and octylcyanoacrylate. Material and Methods: Two skin incisions were done in the dorsal area of 20 rabbits. One incision was closed with nylon 5-0 with stitches every 0.5 cm and the other was closed with 2 layers of octylcyanoacrylate. Groups of nine rabbits were killed at seven and ten days after the procedure. A skin rectangle of the wound area was removed and the tensile force of the suture was measured with a specially devised instrument. A histological study of the incision was also done. Results: At seven days, tensile strength of sutures closed with cyanoacrylate and nylon were 9.65 + 2.72 and 9.28 + 2.38 Newtons, respectively, p=NS. At ten days, the figures were 10.98 + 4.8 and 9.08 + 3.58 Newtons respectively, p=NS. The histological study showed more inflammation, cellularity, fibrosis and vascular proliferation in sutures closed with nylon. Conclusions: No differences in tensile strength of sutures closed with cyanoacrylate or nylon were observed in this animal model. Sutures closed with nylon had a higher inflammatory reaction

Objetivo: Comparar la fuerza tensil de heridas cerradas mediante una sutura monofilamento no reabsorbible (nylon 5-0) y un polímero adhesivo (2-octylcianoacrilato). Material y Método: Estudio experimental. En incisiones de piel, utilizando conejos de la misma raza, se han realizado dos grupos de diez conejos, con dos incisiones cada uno, cerradas con 2-octycianoacrilato y con nylon 5-0 como control. Se ha valorado la fuerza tensil mediante un tensiómetro, en 2 tiempos: al 7º día (grupo I) y al 10° día (grupo II) post cirugía, y se ha tomado una muestra para análisis histológico. Los cálculos estadísticos se hicieron a través de prueba T-Student, y un p < 0,05 se tomó como significación estadística. Resultados: El valor medio de la fuerza tensil en el grupo I fue de 9,65 + 2,72 Newtons para las incisiones cerradas con 2-octylcianoacrilato y 9,28 + 3,28 Newtons para las cerradas con nylon 5-0, no existiendo diferencia estadísticamente significativa (P = 0,801). En el grupo II el valor medio de la fuerza tensil fue 10,98 +4,80 Newtons para las incisiones cerradas con 2-octylcianoacrilato, y 9,08 + 3,58 Newtons para las cerradas con nylon 5-0, no existiendo diferencia estadísticamente significativa (p = 0,357). El estudio histológico mostró mayor inflamación, celularidad, fibrosis y proliferación vascular en incisiones cerradas con nylon 5-0. Conclusiones: La sutura de piel realizada con el polímero adhesivo 2-octylcianoacrilato es tan resistente a la tracción como la realizada con la sutura monofilamento no reabsorbible nylon 5-0 y presenta menor reacción inflamatoria local al estudio histológico