Introduction: The treatment of Hiatal Hernias (HH) type III and IV is surgical. There is controversy about reinforcement with mesh. Our objective was to compare the long-term results between the use or not of prosthetic reinforcements. Materials and Methods: Prospective cohort of 95 patients with HH type III and IV, between 1997 and 2015 at the Clinical Hospital of the University of Chile. Pre and postoperative radiological, endoscopic and functional characteristics were evaluated. Recurrence defined as a recurrence greater than 3 cm. Statistical analysis with chi2 and U-Mann-Whitney test. p-value < 0.05. Results: Complete follow-up in 82% of patients, with a mean of 117 months. In 63% of the cases, the hernia size was < 10 cm, with a mean of 9 cm. 25% presented a gastric volvulus, with an average size of 10.9 cm, being significantly larger than those who did not present (p < 0.0001). The median percentage of time with pH<4 in 24 hours was 9.6%, without encountering hernia size (R = 0.009). The mean lower esophageal sphincter pressure was 8.9 mm Hg, without connection to the size of the hernia (R = 0.0004). Mesh was removed in 41% of cases. Recurrence occurred in 29.7% of the group with prosthesis and in 28.6% of the group without mesh, without significant differences (p = 0.84). Conclusions: In long-term follow-up (> 10 years) of surgically repaired type III and IV HH, there are no differences in clinical recurrence with or without the use of mesh.

Resumen Introducción: El tratamiento de las Hernias Hiatales (HH) tipo III y IV es quirúrgico. Hay controversia sobre el refuerzo con malla. Nuestro objetivo fue comparar los resultados a largo plazo entre el uso o no de refuerzos protésicos. Materiales y Métodos: Cohorte prospectiva de 95 pacientes con HH tipo III y IV, entre los años 1997 y 2015 en el Hospital Clínico de la Universidad de Chile. Se evaluaron las características radiológicas, endoscópicas y funcionales pre y postoperatorias. Recidiva definida como recurrencia mayor a 3 cm. Análisis estadístico con chi2 y Test U-Mam-Whitney. P-value < 0,05. Resultados: Seguimiento completo en el 82% de los pacientes, con una media de 117 meses. En 63% de los casos el tamaño hernia- rio fue < 10 cm, con una media de 9 cm. El 25% presentó vólvulo gástrico, con un tamaño promedio de 10,9 cm siendo, significativamente mayor, que los que no presentaron (p < 0,0001). El porcentaje mediano de tiempo con pH<4 en 24 h fue 9,6%, sin encontrarse correlación con el tamaño herniario (R= 0,009). La media de la presión del esfínter esofágico inferior fue 8,9 mm Hg, sin encontrar correlación con el tamaño de la hernia (R = 0,0004). Se utilizó malla en el 41% de los casos. Recidiva ocurrió en el 29,7% del grupo con prótesis y en el 28,6% del sin malla, sin diferencias significativas (p = 0,84). Conclusiones: En el seguimiento a largo plazo (> a 10 años) de HH tipo III y IV reparadas quirúrgicamente, no hay diferencias en la recidiva clínica con o sin el uso de mallas.

Objective: To evaluate the impact of a simulated open intestinal anastomosis course on general surgery residents. Materials and Methods: Prospective non-randomized study. A course was applied to residents in the general surgery program at the Clinical Hospital of the University of Chile in 2021 for its first version and a second time in 2022. Perception and confidence were evaluated with pre-and post-course surveys. Results: Seventeen residents participated. Of these, 16 residents had previously attended the basic technique, 10 had never performed an intestinal anastomosis as a first surgeon on a real patient, mostly second and third-year residents. The average confidence level for performing an intestinal anastomosis on patients prior to the course was 1.86/7, 3/7, and 5.38/7 for the first, second, and third year, respectively. Overall, prior to the course, residents averaged a confidence of 3.09/7. After the course, 15/16 residents agreed or strongly agreed that it improved their confidence in the technique; that the model accurately represents the real situation, and that simulated models are more effective for learning than clinical experience alone. Residents increased their confidence by 2.47 points, reaching an average of 5.56/7 for the technique (p = 0.001). Conclusions: The open intestinal anastomosis course is perceived by residents as effective, realistic, and significantly increases confidence in performing this technique.

Resumen Objetivo: Evaluar el impacto de un curso de anastomosis intestinal abierta simulada en residentes de cirugía general. Materiales y Métodos: Estudio prospectivo no aleatorizado. Se aplicó un curso para residentes del programa de cirugía general del Hospital Clínico Universidad de Chile en 2021 en su primera versión y una segunda vez en 2022. Se evaluó la percepción y confianza con encuestas pre y post curso. Resultados: Participaron diecisiete residentes. De ellos, 16 residentes habían asistido previamente en la técnica básica, 10 nunca habían realizado una anastomosis intestinal a un paciente real como primer cirujano, en su mayoría residentes de segundo y tercer año. El nivel de confianza promedio para realizar una anastomosis intestinal en pacientes previo al curso fue de 1,86/7, 3/7 y 5,38/7 para el primer, segundo y tercer año, respectivamente. De manera global, previo al curso, los residentes promediaron una confianza de 3,09/7. Después del curso, 15/16 residentes estuvieron de acuerdo o muy de acuerdo en que mejoró la confianza en la técnica; que el modelo representa correctamente la situación real, y que los modelos simulados son más efectivos para el aprendizaje que la experiencia clínica por sí sola. Los residentes aumentaron su confianza en 2,47 puntos, alcanzando un promedio de 5,56/7 para la técnica (p = 0,001). Conclusiones: El curso de anastomosis intestinal abierta es percibido por los residentes como efectivo, realista y aumenta, significativamente, la confianza en la realización de esta técnica.

ABSTRACT BACKGROUND: Small bowel obstruction (SBO) is a major problem in emergencies. Comorbidities increase morbimortality, which is reflected in higher costs. There is a lack of Latin American evidence comparing the differences in postoperative results and costs associated with SBO management. AIMS: To compare the risk of surgical morbimortality and costs of SBO surgery treatment in patients older and younger than 80 years. METHODS: Retrospective analysis of patients diagnosed with SBO at the University of Chile Clinic Hospital from January 2014 to December 2017. Patients with any medical treatment were excluded. Parametric statistics were used (a 5% error was considered statistically significant, with a 95% confidence interval). RESULTS: A total of 218 patients were included, of which 18.8% aged 80 years and older. There were no differences in comorbidities between octogenarians and non-octogenarians. The most frequent etiologies were adhesions, hernias, and tumors. In octogenarian patients, there were significantly more complications (46.3 vs. 24.3%, p=0.007, p<0.050). There were no statistically significant differences in terms of surgical complications: 9.6% in <80 years and 14.6% in octogenarians (p=0.390, p>0.050). In medical complications, a statistically significant difference was evidenced with 22.5% in <80 years vs 39.0% in octogenarians (p=0.040, p<0.050). There were 20 reoperated patients: 30% octogenarians and 70% non-octogenarians without statistically significant differences (p=0.220, p>0.050). Regarding hospital stay, the average was significantly higher in octogenarians (17.4 vs. 11.0 days; p=0.005, p<0.050), and so were the costs, being USD 9,555 vs. USD 4,214 (p=0.013, p<0.050). CONCLUSIONS: Patients aged 80 years and older with surgical SBO treatment have a higher risk of medical complications, length of hospital stay, and associated costs compared to those younger. BACKGROUND (SBO emergencies management AIMS 8 METHODS 201 2017 excluded 5 95 interval. interval . interval) RESULTS 21 included 188 18 18.8 nonoctogenarians. nonoctogenarians non octogenarians. adhesions hernias tumors 46.3 463 46 3 (46. 243 24 24.3% p0007 p 0 007 p=0.007 p<0.050. p0050 p<0.050 050 p<0.050) 96 9 6 9.6 <8 146 14 14.6 p=0.390, p0390 390 (p=0.390 p>0.050. p>0.050 p>0.050) 225 22 22.5 39 39.0 p=0.040, p0040 040 (p=0.040 2 30 70 p=0.220, p0220 220 (p=0.220 stay 17.4 174 17 4 (17. 110 11 11. days p0005 005 p=0.005 p<0.050, , 9555 555 9,55 4214 214 4,21 p=0.013, p0013 013 (p=0.013 CONCLUSIONS 1 18. 46. (46 24.3 p000 00 p=0.00 p005 p<0.05 05 9. < 14. p=0.390 p039 (p=0.39 p>0.05 22. 39. p=0.040 p004 04 (p=0.04 7 p=0.220 p022 (p=0.22 17. (17 955 55 9,5 421 4,2 p=0.013 p001 01 (p=0.01 (4 24. p00 p=0.0 p<0.0 p=0.39 p03 (p=0.3 p>0.0 p=0.04 (p=0.0 p=0.22 p02 (p=0.2 (1 9, 42 4, p=0.01 ( p0 p=0. p<0. p=0.3 (p=0. p>0. p=0.2 p=0 p<0 (p=0 p>0 p= p< (p= p> (p

RESUMO RACIONAL: A obstrução do intestino delgado (OID) é um grande problema em emergências. As comorbidades aumentam a morbimortalidade, o que se reflete no aumento dos custos. Há uma falta de evidência latino-americana comparando as diferenças nos resultados pós-operatórios e custos associados ao manejo da OID. OBJETIVOS: Comparar o risco de morbimortalidade cirúrgica e os custos de tratamento cirúrgico da OID em pacientes com idade inferior e superior a 80 anos. MÉTODOS: Análise retrospectiva de pacientes diagnosticados com OID no Hospital Clínico da Universidade do Chile entre janeiro de 2014 e dezembro de 2017. Pacientes com qualquer tratamento médico foram excluídos. Estatísticas paramétricas foram usadas: erro de 5% foi considerado estatisticamente significante, com intervalo de confiança de 95%. RESULTADOS: Um total de 218 pacientes foram incluídos, dos quais 18,8% tinham 80 anos ou mais. Não houve diferenças nas comorbidades entre octogenários e não octogenários. As etiologias mais frequentes foram aderências, hérnias e tumores. Nos pacientes octogenários houve significativamente mais complicações (46,3 vs. 24,3%, p=0,007, p<0,050). Não houve diferenças estatisticamente significativas quanto às complicações cirúrgicas: 9,6% em <80 anos e 14,6% em octogenários (p=0,390, p>0,050). Nas complicações médicas foi evidenciada diferença estatisticamente significativa com 22,5% em <80 anos vs. 39.0% em octogenários (p=0,040, p<0,050). Foram reoperados 20 pacientes: 30% octogenários e 70% não octogenários, sem diferenças estatisticamente significativas (p=0,220, p>0,050). Em relação ao tempo de internação, a média foi significativamente maior nos octogenários (17,4 v/s 11,0 dias; p=0,005, p<0,050). Da mesma forma, também foram os custos com 9.555 USD vs. 4.214 USD (p=0,013, p<0,050). CONCLUSÕES: Pacientes com 80 anos ou mais com tratamento cirúrgico de OID têm maior risco de complicações médicas, tempo de internação e custos associados em comparação aos mais jovens. RACIONAL (OID emergências latinoamericana latino americana pósoperatórios pós operatórios OBJETIVOS 8 MÉTODOS 201 2017 excluídos usadas 5 significante 95 95% RESULTADOS 21 incluídos 188 18 18,8 aderências tumores 46,3 463 46 3 (46, vs 243 24 24,3% p0007 p 0 007 p=0,007 p<0,050. p0050 p<0,050 . 050 p<0,050) cirúrgicas 96 9 6 9,6 <8 146 14 14,6 p=0,390, p0390 390 (p=0,390 p>0,050. p>0,050 p>0,050) 225 22 22,5 39 39.0 p=0,040, p0040 040 (p=0,040 2 30 70 p=0,220, p0220 220 (p=0,220 17,4 174 17 4 (17, v s 110 11 11, dias p0005 005 p=0,005 forma 9555 555 9.55 4214 214 4.21 p=0,013, p0013 013 (p=0,013 CONCLUSÕES jovens 1 18, 46, (46 24,3 p000 00 p=0,00 p005 p<0,05 05 9, < 14, p=0,390 p039 (p=0,39 p>0,05 22, 39. p=0,040 p004 04 (p=0,04 7 p=0,220 p022 (p=0,22 17, (17 955 55 9.5 421 4.2 p=0,013 p001 01 (p=0,01 (4 24, p00 p=0,0 p<0,0 p=0,39 p03 (p=0,3 p>0,0 p=0,04 (p=0,0 p=0,22 p02 (p=0,2 (1 9. 42 4. p=0,01 ( p0 p=0, p<0, p=0,3 (p=0, p>0, p=0,2 p=0 p<0 (p=0 p>0 p= p< (p= p> (p

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. BACKGROUND value status field AIMS longterm long term intent METHODS 200 2013 crosssectional cross sectional L third vertebra media. media . media) 1002 10 0 2 10.0.2 propagate segmentation, segmentation , segmentation” adjusted RESULTS 7 77 men 166 16 6 16. cm standard deviation+6.1 deviation61 deviation 1 361 36 36. deviation+7.1. deviation71 deviation+7.1 deviation+7.1) 86 286 28 28.6 signetring signet ring cells 786 78 78.6 gastrectomy 228 22 8 22. 2.8% respectively 5year year 5 571 57 57.1% analysis p=0.4 p04 p 4 (p=0.4 p=0.34, p034 p=0.34 34 (p=0.34) p=0.009 p0009 009 (p=0.009 0.86 086 95CI CI 95 0.76–0.96 076096 76 96 p=0.04 p004 04 (p=0.04 2.9 29 9 1.04–8.15. 104815 1.04–8.15 15 1.04–8.15) CONCLUSIONS 20 201 100 10.0. deviation+6. deviation6 3 deviation7 deviation+7. 28. 78. 2.8 57.1 p=0. p0 (p=0. p03 p=0.3 (p=0.34 p=0.00 p000 00 (p=0.00 0.8 08 0.76–0.9 07609 p=0.0 p00 (p=0.0 2. 10481 1.04–8.1 10.0 deviation+6 deviation+7 57. p=0 (p=0 (p=0.3 0. 0.76–0. 0760 1048 1.04–8. 10. deviation+ p= (p= 0.76–0 076 104 1.04–8 (p 0.76– 07 1.04– 0.76 1.04 0.7 1.0 1.

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. RACIONAL préoperatório pré operatório pósoperatório. pósoperatório pós operatório. pós-operatório campo OBJETIVOS préoperatório, operatório, pósoperatória operatória curativa MÉTODOS 200 2013 (PA (PD L Terceira lombar, lombar , lombar) intravascular. intravascular . intravascular) 1002 10 0 2 10.0.2 propagar segmentação, segmentação segmentação” imagem RESULTADOS 7 77 homens 166 16 6 16, cm padrão+6,1, padrão61 padrão+6,1 1 padrão+6,1) 361 36 36, padrão+7,1. padrão71 padrão+7,1 padrão+7,1) 86 286 28 28,6 sinete 786 78 78,6 total 228 22 8 22, 2,8% respectivamente SV (SV5 571 57 57,1% multivariada p=0,4 p04 p 4 (p=0,4 p=0,34, p034 p=0,34 34 (p=0,34) p=0,009 p0009 009 (p=0,009 0,86 086 IC95 IC 0,76–0,96 076096 76 96 p=0,04 p004 04 (p=0,04 2,9 29 9 1,04–8,15. 104815 1,04–8,15 15 1,04–8,15) CONCLUSÕES 20 201 100 10.0. padrão6 padrão+6, 3 padrão7 padrão+7, 28, 78, 2,8 (SV 57,1 p=0, p0 (p=0, p03 p=0,3 (p=0,34 p=0,00 p000 00 (p=0,00 0,8 08 IC9 0,76–0,9 07609 p=0,0 p00 (p=0,0 2, 10481 1,04–8,1 10.0 padrão+6 padrão+7 57, p=0 (p=0 (p=0,3 0, 0,76–0, 0760 1048 1,04–8, 10. padrão+ p= (p= 0,76–0 076 104 1,04–8 (p 0,76– 07 1,04– 0,76 1,04 0,7 1,0 1,

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. BACKGROUND longsegment long segment Barretts Barrett s (LSBE) however RouxenY Roux en Y suppressionduodenal longterm term followup. followup follow up. up combination AIMS lowgrade low grade METHODS 21 (21 31. 31 . (31) 5–12 512 5 12 (5–1 years evaluation RESULTS ulcers strictures Retreatment Re 10.95 1095 10 95 (10.9 2115 15 21.1 3096 30 96 30.9 4441 44 41 44.4 length. length) CONCLUSIONS (LSBE 2 (2 3 (31 5–1 51 1 (5– 10.9 109 9 (10. 211 21. 309 30. 444 4 44. ( (3 5– (5 10. (10 (1

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. RACIONAL , (EBSL) entanto ácidobiliar ácido biliar FGDY FGD (FGD-Y terapêutica OBJETIVOS grau FGDY, Y, FGD-Y MÉTODOS Praga (C M (M histológico CPA, (CPA 2 ARF, (ARF 3 . 5–12 512 5 12 (5–1 anos, anos anos) histológica RESULTADOS úlcera estenose. estenose estenose) Retratamento Re 10,95 1095 10 95 (10,9 2115 15 21,1 3096 30 96 30,9 4441 44 41 44,4 M. M) CONCLUSÕES (EBSL 5–1 51 1 (5– 10,9 109 9 (10, 211 21, 309 30, 444 4 44, 5– (5 10, (10 ( (1

Background: Gallbladder Cancer (GBC) prevalence varies among countries, associated with different geographical and genetic factors. The Mapuche ethnicity (Ethnia mostly located between the VIII and X Chilean regions) stands out in Chile due to its high GBC prevalence. Aim: To estimate the GBC prevalence in patients undergoing cholecystectomy at a public hospital in the Northern region of Chile (Tarapaca), where other ethnical groups are common. Material and methods: Pathological reports of 3270 patients (72% women) who underwent cholecystectomy between January 2016 and December 2019 were revised. Subsequently, the accreditation of ethnic belonging for each patient to one of the ten native communities in Chile was requested to the National Corporation for Native Communities Development (CONADI). Results: According to the analysis of pathological reports, the global GBC prevalence was 0.3 %. The prevalence in Aymaras was 0.4% and 0% in Mapuches. The distribution of ethnic origins among analyzed patients was Aymara in 14.3, Mapuche in 2.7%, Diaguita in 1.7%, Quechua in 1.3%, Atacameña in 0.2%, and Colla in 0.2%. No specific ethnic origin was found in 79% of patients. Conclusions: There was a low GBC prevalence rate in Northern Chile and among the Aymara population.

RESUMO - RACIONAL: A obstrução do intestino delgado (OID) é uma causa frequente de admissões ao Serviço de Emergência. OBJETIVO: Determinar os fatores de risco de reoperações, eventos adversos pós-operatórios e mortalidade operatória (MO) em pacientes com OID tratados cirurgicamente. MÉTODOS: Estudo retrospectivo entre 2014 e 2017. Critérios de exclusão: obstrução da saída do estômago, obstrução do intestino grosso e história clínica incompleta. O STATA 14 foi utilizado para análise estatística, considerando significância estatística p<0,05 com IC de 95%. RESULTADOS: Duzentos e dezoito pacientes foram incluídos, 61,9% mulheres, 88,5% dos pacientes tinham cirurgia abdominal anterior. A ressecção intestinal foi necessária em 28,4% dos pacientes. O evento adverso pós-operatório (EAPO) esteve presente em 28,4%, a reoperação foi necessária em 9,2% dos casos e a mortalidade cirúrgica em 90 dias foi de 5,9%. A análise multivariada determinou que a ressecção intestinal, > 3 dias em UTI, > 7 dias com sonda nasogástrica (SNG), dor após o 3º dia de pós-operatório, EAPO cirúrgico foram fatores de risco para reoperações, enquanto idade, proteína C reativa, ressecção intestinal, > 3 dias em UTI, > 7 dias com SNG foram fatores de risco para EAPO. A MO foi determinada em > 5 dias com SNG e EAPO. CONCLUSÕES: A evolução pós-operatória é determinada principalmente pela idade do paciente, nível pré-operatório de proteína C reativa, necessidade de ressecção intestinal, variáveis clínicas pós-operatórias e presença de EAPO.

ABSTRACT - BACKGROUND: Small bowel obstruction (SBO) is a frequent cause of emergency department admissions. AIM: This study aimed to determine risk factors of reoperations, postoperative adverse event, and operative mortality (OM) in patients surgically treated for SBO. METHODS: This is a retrospective study conducted between 2014 and 2017. Exclusion criteria include gastric outlet obstruction, large bowel obstruction, and incomplete clinical record. STATA version 14 was used for statistical analysis, with p-value <0.05 with 95% confidence interval considered statistically significant. RESULTS: A total of 218 patients were included, in which 61.9% were women. Notably, 88.5% of patients had previous abdominal surgery. Intestinal resection was needed in 28.4% of patients. Postoperative adverse event was present in 28.4%, reoperation was needed in 9.2% of cases, and a 90-day surgical mortality was 5.9%. Multivariate analysis determined that intestinal resection, >3 days in intensive care unit (ICU), >7 days with nasogastric tube (NGT), pain after postoperative day 3, POAE, and surgical POAE were the risk factors for reoperations, while age, C-reactive protein, intestinal resection, >3 days in ICU, and >7 days with NGT were the risk factors for POAE. OM was determined by >5 days with NGT and POAE. CONCLUSIONS: Postoperative course is determined mainly for patient’s age, preoperative level of C-reactive protein, necessity of intestinal resection, clinical postoperative variables, and the presence of POAE.

Upper gastrointestinal bleeding (UHD) is a common medical-surgical emergency that must be treated early due to its high morbidity and mortality. It corresponds to bleeding from the esophagus, stomach, or proximal duodenum, and is divided into non-variceal and variceal etiology. Among the non-variceal, the peptic ulcer stands out as the most frequent, being this produced by an imbalance between protective and aggressive factors. On the other hand, in variceal hemorrhages gastroduodenal varices stand out, are a consequence of increased portal pressure. The incidence of HDA worldwide varies between 37 to 172 cases per 100,000 inhabitants per year and mortality between 5 to 14% according to different studies. Unfortunately, there are no reliable national statistics of incidence and prevalence. The physician must have a good understanding of the clinical presentation and pathophysiology to be assertive in the suspicion, diagnosis, and management of this pathology. Regarding treatment, the confrontation is divided into emergency management and then endoscopic, because early intensive resuscitation can reduce morbidity and mortality in patients with UHD. This is an updated review which will be focused on the most relevant aspects of the management of this pathology. Data were obtained from Pubmed and Scielo, specifically searching for original articles and systematic reviews with the words “upper gastrointestinal bleeding”, “peptic ulcer”, “esophageal varices” and other related words. The criteria used were articles preferably less than 5 years old in scientific journals with a high impact index.

Resumen La hemorragia digestiva alta (HDA) es una emergencia médico-quirúrgica común que debe ser tratada precozmente por su alta morbimortalidad. Corresponde a sangrado del esófago, estómago o del duodeno proximal, y se divide en etiología no variceal y variceal. Dentro de las no variceales destaca la úlcera péptica como la más frecuente, siendo esta producida por un desbalance entre factores protectores y agresivos. Por otro lado, en las hemorragias variceales destacan las várices gastroduodenales, las cuales son consecuencia del aumento de la presión portal. La incidencia de la HDA a nivel mundial varía entre 37 a 172 casos por cada 100.000 habitantes por año y la mortalidad entre un 5 y un 14% según diferentes estudios. Lamentablemente, no existen cifras nacionales fidedignas de incidencia y prevalencia. El médico debe conocer bien la presentación clínica y la fisiopatología para ser asertivo en la sospecha, diagnóstico y manejo de esta patología. En cuanto al tratamiento, el enfrentamiento se divide en el manejo de urgencias y luego endoscópico, puesto que la resucitación temprana intensiva puede reducir la morbimortalidad en pacientes con HDA. A continuación se hará una revisión actualizada enfocada en los aspectos más relevantes del manejo de esta patología. Se obtuvieron los datos de Pubmed y Scielo, específicamente la búsqueda de artículos originales y de revisiones sistemáticas con las palabras “hemorragia digestiva alta”, “úlcera péptica”, “várices esofágicas” y otras relacionadas. Los criterios usados fueron artículos preferentemente menores a 5 años de publicación en revistas científicas de alto índice de impacto.

Laparoscopic Nissen Fundoplication (LNF) is the gold standard of surgical treatment for patients with Gastroesophageal Reflux Disease (GER), with safety profile and long term results satisfactory in 80%. In the last decade, the use of a Lower Esophageal Sphincter Enhancement Device (LESD), marketed as LINX® (from Ethicon, Johnson & Johnson), has been proposed as an alternative to Anti-Reflux Surgery. The device consists of an expandable chain of titanium beads with a magnetic core designed to increase the tone of the lower esophageal sphincter (LES) and prevent its improper relaxation. Preliminary results have been encouraging; however, it is not without complications. The most accepted indications are: GER with normal esophageal motility and without erosive esophagitis, hiatal hernia < 3 cm, BMI <35 kg/m2, and patients without previous gastroesophageal surgeries. It is installed by laparoscopy. The most important adverse effects are: dysphagia with the need for endoscopic dilations, and, removal of the device, between 1 and 7% at 2.5 years. Most of the studies have methodological limitations, conflicts of interest, lack of objective results and long-term follow-up, preventing the reaching of extrapolable conclusions regarding the efficacy of MSA.

Resumen La fundoplicatura de Nissen laparoscópica (FNL) es el gold standard del tratamiento quirúrgico de pacientes con reflujo gastroesofágico patológico (RGE), con perfil de seguridad y resultados a largo plazo satisfactorios en un 80%. En la última década, se ha propuesto el uso de un dispositivo de potenciación del esfínter esofágico inferior (MSA) comercializado como LINX® (de Ethicon, Johnson & Johnson), como alternativa a la cirugía antirreflujo. El dispositivo consiste en una cadena expansible de cuentas de titanio con un núcleo magnético diseñadas para aumentar el tono del esfínter esofágico inferior (EEI) y evitar su relajación inadecuada. Los resultados preliminares han sido alentadores, sin embargo, no está exento de complicaciones. Las indicaciones más aceptadas son: RGE con motilidad esofágica normal y sin esofagitis erosiva, hernia hiatal < 3 cm, IMC <35 kg/m2 y pacientes sin cirugías gastroesofágicas previas. Se instala por vía laparoscópica. Los efectos adversos más importantes son: disfagia con necesidad de dilataciones endoscópicas, y, retiro del dispositivo, entre 1% y 7% a los 2,5 años. La mayoría de los estudios tienen limitaciones metodológicas, conflictos de interés, falta de resultados objetivos y seguimientos a largo plazo, impidiendo llegar a conclusiones extrapolables respecto a la eficacia del MSA.

Achalasia is a primary motor disorder of the esophageal smooth muscle characterized by dysphagia, pseudoregurgitation, and weight loss. Treatment can be endoscopic or surgical. The long-term results are only known from surgery, while endoscopic results still have a very short follow-up and do not allow us to draw valid conclusions. Achalasia is a lesión that has a significantly higher probability of developing esophageal cancer, whether of the epidermoid type, due to chronic inflammation and food retention in the esophagus, or an adenocarcinoma, secondary to gastroesophageal reflux, which appears after any treatment. Publications show that about 3 to 4% of patients present in time, about 10 to 15 years after treatment, the development of advanced cancer of the esophagus. It is concluded that clinical and endoscopic follow-up is essential in these patients on a routine basis.

Resumen La acalasia es un trastorno motor primario de la musculatura lisa esofágica que se caracteriza por disfagia, pseudorregurgitación y baja de peso. El tratamiento puede ser endoscópico o quirúrgico. Sólo se conocen los resultados a largo plazo de la cirugía, mientras que los endoscópicos tienen aún un seguimiento muy corto y no permiten sacar conclusiones valederas. La acalasia es una lesión que tiene una probabilidad significativamente mayor de desarrollar un cáncer esofágico, ya sea de tipo epidermoide, por inflamación crónica y retención de comida en el esófago, o un adenocarcinoma, secundario a reflujo gastroesofágico, que aparece posterior a cualquier tratamiento. Las publicaciones muestran que alrededor de 3% a 4% de los pacientes presentan a largo plazo, sobre 10 a 15 años postratamiento, el desarrollo de un cáncer avanzado del esófago. Se concluye que es indispensable un seguimiento clínico y endoscópico en forma rutinaria a estos pacientes.

Background: The worldwide incidence of acute pancreatitis (AP) is increasing. Aim: To determine the national incidence of AP between 2013 and 2018. Material and Methods: Analysis of hospital discharge records available at the web page of the Statistical and Information Service of the Chilean Ministry of Health. We recorded the number of patients discharged with a diagnosis of AP, excluding chronic pancreatitis and pancreatic cancer, between 2013 and 2018. We also recorded length of hospital stay, age, etiology, and lethality. Rates of raw and age-adjusted incidence were calculated. Results: During the study period, 46,420 patients with AP were discharged, with an incidence rate ranging between 39 and 43.7/100,000 inhabitants, and a non-significant increase along time of 8.6%. There are important differences between the average adjusted rates of Northern (Arica to Metropolitan) and Southern regions (O’Higgins to Magallanes), with rates of 36.9 and 53.6/100,000 inhabitants respectively (p < 0.01). The average hospital stay was 11 days. Two thirds of cases were aged between 20 and 64 years. The case fatality was 4.2%, with no decrease between 2013 and 2018. The mortality rate was 1.6/100,000 inhabitants. Conclusions: The annual incidence of AP is 42.6/100,000 inhabitants, with geographical differences from North to South, which can be associated with the high frequency of biliary tract disease in aboriginal ethnic groups. The age distribution and length hospital stay were stable over time.

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.

Background: The prevalence of cholelithiasis and gallbladder cancer may be different across ethnic groups. Aim: To study the prevalence of cholelithiasis and gallbladder cancer among Aymara individuals. Material and Methods: An abdominal ultrasound was carried out in a sample of 182 Aymara women aged 46 ± 16 years and 76 Aymara men aged 55 ± 16 years. In addition, the histopathological reports of both patients with a history of previous cholecystectomy and those operated after the study were reviewed. Results: Ultrasound was normal in 150 participants (58%), 76 had cholelithiasis (30%) and 32 (12%) had a history of cholecystectomy. Pathological reports of the excised gallbladder were available for 106 cases and showed a chronic cholecystitis in 98% of cases. Gallbladder cancer was not reported. Conclusions: There is a 42% prevalence of cholelithiasis and no gallbladder cancer in this sample of Aymara population.

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.