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BACKGROUND: This study aimed to evaluate the use of artificial intelligence (AI) to detect the critical view of safety during elective laparoscopic cholecystectomy. METHODS: This was a prospective, observational study evaluating the detection of the critical view of safety with an AI software in a consecutive series of elective laparoscopic cholecystectomies compared with the blinded evaluation of 3 surgeons. The program was created using the digital tools PyCharm (JetBrains), Google Colab Pro (https://colab.google/), and YOLOv8 (Ultralytics). RESULTS: A total of 40 consecutive elective laparoscopic cholecystectomies were included in the study. The program was able to detect the critical view of safety in all cases following the experts' blinded opinion. CONCLUSION: In this preliminary experience, an AI software was able to detect the critical view of safety in elective laparoscopic cholecystectomies. Its application during nonelective cases, in which the critical view of safety is harder to achieve, might warrant further studies.

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RESUMEN La litiasis vesicular asociada a coledocolitiasis puede tener distintos tratamientos, endoscópicos o quirúrgicos, dependiendo del paciente, el entrenamiento del personal médico y de la disponibilidad de instrumental. Ninguno ha demostrado estar exento de complicaciones. Presentamos dos técnicas tendientes a mejorar los resultados del tratamiento quirúrgico de la coledocolitiasis. Una es la extracción transcística de coledocolitiasis y stent, en pacientes que fueron tratados endoscópicamente por colangitis, tendiente a resolver el problema (la litiasis vesicular, la coledocolitiasis y el stent) en un solo tiempo por cirugía laparoscópica. La segunda es una nueva indicación de una técnica ya descripta, la dilatación papilar anterógrada con balón, utilizada en este caso para disminuir las fugas biliares tras un cierre primario de colédoco.

ABSTRACT Cholelithiasis associated with choledocholithiasis may have different treatments, either by endoscopy or surgery, depending on the patient, level of training of the medical staff and availability of instruments. None of them is free of complications. We report two non-conventional techniques aimed at improving the results of the management of choledocholithiasis. Transcystic removal of common bile duct stones and stent in patients who underwent endoscopic treatment for cholangitis is one of these new techniques to manage cholelithiasis, choledocholithiasis and stent removal in a single procedure through laparoscopy. The second technique is a new indication of a previously described procedure, antegrade balloon papillary dilation to reduce biliary leaks after primary closure of the common bile duct.

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Antecedentes: La retroperitonitis es una rara y severa complicación de la apendicitis. Hasta el presente solo unos pocos reportes de casos han sido publicados en la literatura inglesa. Objetivo: El objetivo de este trabajo es analizar una serie consecutiva de 11 casos tratados en nuestra institución. Materiales y Método: Análisis retrospectivo de una base de datos recolectada en forma prospectiva de todos los pacientes admitidos por retroperitonitis de origen apendicular durante el período marzo 2017-septiembre 2020. Se analizarán las variables asociadas con esta complicación y su manejo. Resultados: 11 pacientes de un total de 601 con diagnóstico de apendicitis presentaron una retroperitonitis durante el período analizado (1,83%). El retardo en el diagnóstico fue en promedio de 8 días (rango 3 - 14 días). Todos los pacientes tuvieron un apéndice retrocecal y 81% presentaron un coprolito asociado. 45% fueron manejados inicialmente con abdomen abierto y contenido, y 55% con cierre fascial primario (50% de fracaso). La morbilidad y mortalidad fueron del 81% y 18%, respectivamente Discusión: La localización retrocecal del apéndice, la presencia de un coprolito y la presentación atípica, con demora en el diagnóstico, fueron factores comunes presentes en nuestra experiencia. El manejo con cierre fascial primario fracasó en la mitad de los casos. La morbimortalidad fue elevada. Conclusión: La retroperitonitis es una infrecuente pero severa complicación de la apendicitis, con elevada morbimortalidad.

Background: Retroperitonitis is a rare and life-threatening complication of appendicitis. So far, only a few cases have been described so far in the English literature. Aim: The objetive of this paper is to analyze a consecutive series of 11 patients treated at our institution. Materials and Method: Retrospective analysis of a prospectively collected database of all patients admitted for appendicular retroperitonitis during the period March 2017-September 2020. The variables associated with this complication and its management are analyzed. Results: 11 patients from 601 with a diagnosis of appendicitis presented with retroperitonitis during the study period (1.83%). Mean delay in diagnosis was 8 days (range 3-14 days). The location of the appendix was retrocecal in all cases and 81% had an appendicolith associated. 45% were initially managed with open abdomen. A 50% failure rate occurred after primary fascial closure. Morbidity and mortality rates were 81% and 18%, respectively. Discussion: Retrocecal location of the appendix, the presence of an appendicolith and atypical presentation with delayed diagnosis were common factors present in our experience. Primary fascial closure was associated with a 50% failure rate. Morbidity and mortality were high. Conclusion: Retroperitonitis is a rare but severe complication of appendicitis, with high morbidity and mortality rates.

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RESUMEN Antecedentes: la pandemia de COVID-19 alteró la formación de los residentes de cirugía, disminuyendo sus oportunidades de aprendizaje. La lectura y análisis de trabajos científicos a través de pódcast podrían ser una opción para atenuar ese problema. Objetivo: evaluar la aceptación por parte de los residentes de Cirugía del uso de pódcast como una nueva herramienta educativa. Material y métodos: estudio exploratorio, analítico y longitudinal, realizado desde mayo hasta diciembre de 2020. Cada semana, un residente fue el encargado de leer, analizar y confeccionar una presentación grabada en forma de pódcast sobre un artículo seleccionado por médicos de planta. Se evaluó la experiencia de los residentes mediante un cuestionario tipo Likert diseñado por los investigadores. Resultados: se realizaron 37 pódcast, que se reprodujeron 2091 veces. El 100% de los residentes informó que esta herramienta fomentó la discusión académica entre pares, el 88% que le generó preguntas de investigación y el 43% que lo inspiró a una revisión bibliográfica. Conclusión: la lectura y análisis de trabajos a través de pódcast es bien aceptada y puede ser una herramienta adicional para el aprendizaje en épocas atípicas.

ABSTRACT Background: COVID-19 pandemic altered the training of residents in surgery, reducing their opportunities to learn. Reading and analyzing scientific paper via podcasts could be an option to mitigate such problem. Objective: The aim of this study is to evaluate residents in surgery acceptance of the use of podcasts as a new educational tool. Material and methods: We conducted a longitudinal, analytical and exploratory study between May and December 2020. Each week, a resident was in charge of reading, analyzing and preparing a recorded presentation in the format of a podcast of an article selected by a staff physician. The residents' experience was assessed by means of a Likert-type questionnaire designed by the investigators. Results: A total of 37 podcasts were recorded with a total number of plays of 2091. All the residents reported that this tool encouraged the academic peer discussion, 88% responded that it generated research questions and 43% agreed that listening to the podcasts served as inspiration to perform a bibliographic search. Conclusion: Reading and analyzing scientific papers via podcasts is well accepted and could be an additional tool for learning in atypical times.

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RESUMEN Antecedentes: el manejo laparoscópico en un tiempo de la coledocolitiasis se acompaña de una tasa de éxito elevada en la mayoría de los casos. Una excepción a esto son los cálculos coledocianos difi cultosos. Objetivo: describir los resultados del manejo de cálculos coledocianos dificultosos. Material y métodos: revisión retrospectiva de una serie consecutiva de casos de cálculos coledocianos dificultosos tratados durante el período 2018-2020. Resultados: 8 pacientes cumplieron con el criterio de inclusión. El manejo en un tiempo por videola paroscopia (5 casos) tuvo un 60% de conversión a cirugía abierta. Los otros pacientes (3 casos) fueron manejados inicialmente con endoscopia biliar por colangitis grave y fueron resueltos luego en forma electiva por instrumentación transcística. Conclusión: esta experiencia inicial sugiere que el abordaje en dos tiempos podría favorecer la resolu ción mininvasiva de los cálculos coledocianos dificultosos.

ABSTRACT Background: Single-stage procedure for the treatment of choledocholithiasis by laparoscopy is associated with high success rate in most cases. Difficult common bile duct stones are an exception to this rule. Objective: The aim of this study is to describe the results obtained with the management of difficult common bile duct stones. Material and methods: We conducted a retrospective review of a consecutive series of cases of difficult common bile duct stones treated between 2018-2020. Results: Eight patients fulfilled the inclusion criteria. Of the 5 patients managed with single-stage approach through video-assisted laparoscopy, 60% required conversion to open surgery. The other 3 cases were initially managed with endoscopic cholangiography due to severe cholangitis and were solved with elective transcystic instrumentation. Conclusion: This initial experience suggests that the two-stage approach could be better to treat difficult common bile duct stones with a minimally invasive approach.

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RESUMEN Antecedentes: la prevalencia conjunta de litiasis vesicular y coledociana aumenta con la edad y llega al 15% en la octava década de la vida. Su manejo continúa siendo controvertido: algunos profesionales prefieren el abordaje en un tiempo por videolaparoscopia, y otros, el abordaje en dos tiempos con endoscopia (CPRE preoperatoria) seguida de colecistectomía laparoscópica. Objetivo: evaluar la eficacia y seguridad del manejo en un tiempo por videolaparoscopia en pacientes consecutivos con diagnóstico de litiasis vesicular y coledociana. Material y métodos: estudio retrospectivo con datos de una base de datos prospectiva, entre julio de 2008 y julio de 2018. Resultados: sobre un total de 2447 colecistectomías laparoscópicas realizadas en el citado período, 416 (17%) presentaron litiasis coledociana. El éxito global de la vía transcística en la extracción de litiasis coledociana fue del 81,2%: del 70,4% en los casos con diagnóstico prequirúrgico de colestasis extrahepática litiásica y del 92,9% en los otros diagnósticos. La morbilidad fue del 4%, sin mortalidad ni lesiones quirúrgicas de la vía biliar. Conclusión : el manejo en un tiempo por videolaparoscopia es eficaz y seguro debido al elevado éxito global de la instrumentación transcística (ITC). El diagnóstico preoperatorio de coledocolitiasis condi ciona una disminución de esa eficacia, por mayor indicación de coledocotomía, con un aumento de la morbilidad y del tiempo de internación.

ABSTRACT Background: The prevalence of common bile duct stones associated with cholelithiasis increases with age and is about 15 % in the 8th decade of life but its management is still controversial. Some surgeons prefer the single-stage approach with laparoscopy while others suggest the two-stage management with preoperative endoscopic retrograde cholangiopancreatography (ERCP) followed by laparoscopic cholecystectomy. Objective: The aim of the present study was to evaluate the efficacy of feasibility of single-stage laparoscopic surgery in patients with cholelithiasis and choledocholithiasis. Material and methods: We conducted a retrospective study with prospectively collected data between July 2008 and July 2018. Results: Of 2447 laparoscopic cholecystectomies performed during the study period, 416 presented common bile duct stones. The global success of the transcystic approach to clear common bile duct stones was 81.2%, 70.4% in the cases with preoperative diagnosis of choledocholithiasis and 92.9% for other diagnoses. The rate of complications was 4% without deaths or bile duct injuries. Conclusion: Single-stage laparoscopic surgery is an efficient and safe approach based on the high global success of transcystic exploration. The preoperative diagnosis of choledocholithiasis reduces the efficacy of the procedure due to greater indication of choledocotomy, with complications and longer length of hospital stay.

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Paraesophageal hernia (PEH) repair is one of the most challenging upper gastrointestinal operations. Its high rate of recurrence is due mostly to the low quality of the crura and size of the hiatal defect. In an attempt to diminish the recurrence rates, some clinical investigators have begun performing mesh-reinforced cruroplasty with nonabsorbable meshes like polypropylene or polytetrafluoroethylene. The main problem with these materials is the occurrence, in some patients, of serious mesh-related morbidities, such as erosions into the stomach and the esophagus, some of which necessitate subsequent esophagectomy or gastrectomy. Absorbable meshes can be synthetic or biological and were introduced in recent years for PEH repair with the intent of diminishing the recurrence rates observed after primary repair alone but, theoretically, without the risks of morbidities presented by the nonabsorbable meshes. The current role of absorbable meshes in PEH repair is still under debate, since there are few data regarding their long-term efficacy, particularly in terms of recurrence rates, morbidity, need for revision, and quality of life. In this opinion review, we analyze all the presently available evidence of reinforced cruroplasty for PEH repair using nonabsorbable meshes (synthetic or biological), focusing particularly on recurrence rates, mesh-related morbidity, and long-term quality of life.

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Bariatric surgery is performed usually in a videolaparoscopic form. This involves that surgeons must have the abilities of advanced laparascopy. The learning curve was previously analyzed in numerous reports. This curriculums for the fellowships include the development of cognitive abilities and clinicotechnical training. Through the Course of Specialists for Metabolic and Bariatric Surgery from the Buenos Aires University, four fellows have been formed. In this study, the training modality is described

La cirugía bariátrica se realiza generalmente de forma videolaparoscópica. Esto implica que los cirujanos tengan habilidades de laparoscopía avanzada. La curva de aprendizaje se ha analizado en numerosos trabajos. Las currículas para los fellowship incluyen el desarrollo de habilidades cognitivas y clínico-técnicas. A través de la Carrera de Especialista en Cirugía Bariátrica y Metabólica de la UBA se han formado cuatro fellows. En este trabajo se describe la modalidad de aprendizaje

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Antecedentes: la colecistts xantogranulomatosa es una enfermedad infamatoria con destrucción de la pared vesicular, cuya prevalencia oscila entre el 0.7 y 13,2% de las colecistectomías. Objetvos: analizar la incidencia, forma de presentación y resultados del tratamiento de esta patología en un Centro de Cirugía HPB de la Ciudad de Buenos Aires. Lugar de aplicación: Departamento de Cirugía HIGA Dr. Cosme Argerich. Diseño: retrospectvo Población: colecistectomías realizadas en el HIGA Argerich, entre abril de 2008 y abril de 2010. Método: análisis histopatológico de las piezas de colecistectomía. Estratificación de la presentación clínica en formas incidentales o pseudotumorales. Análisis de las complicaciones intraoperatorias y posoperatorias, estadía hospitalaria y mortalidad. Resultados: de 815 colecistectomías videolaparoscópicas 32 (3,9%) fueron colecistts xantogranulo-matosas. Dieciocho fueron hombres y 14 mujeres. Edad media 40,6 años. Los pacientes se evaluaron por ecografa y en las formas pseudotumorales se agregó una tic abdominal. Veintsiete fueron formas incidentales y 5 pseudotumorales. El tempo operatorio promedio fue de 114 minutos y no hubo conversiones. Dos bilirragias intraoperatorias se controlaron en las formas pseudotumorales y una bilirragia y 2 pseudoaneurismas rotos de la arteria hepática fueron reoperados en las formas incidentales. La estadía posoperatoria promedio fue de 2,6 días. Conclusión: la colecistts xantogranulomatosa puede presentarse como un proceso infamatorio habitual o remedar un cáncer de vesícula. Las imágenes son imprescindibles para el diagnóstico diferencial. Fueron más frecuentes las complicaciones intraoperatorias en las formas pseudotumo-rales y las posoperatorias en las incidentales. El cirujano debe conocer esta entdad y sus eventuales complicaciones.

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Since the realization in 1991 of the National Institutes of Health Consensus Development Conference Draft Statement on Gastrointestinal Surgery for Severe Obesity, the bariatric surgery become accepted by the medical community as the most long-term efficient procedure for the treatment of morbid obesity. The surgical suggestion is based mainly in the Body Mass Index of the patient wight/height (kg/m2). Bariatric surgical techniques can be classified according to their main mechanism of action in: restrictives (adjustable gastric banding, sleeve gastrectomy, open vertical banded gastroplasty), malabsorptives: biliopancreatic derivation Scopinaro type or biliopancreatic derivation with duodenal switch (Marceau) and finally the Roux-en-Y gastric bypass. All these aspects are treated in the article.(AU)

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Since the realization in 1991 of the National Institutes of Health Consensus Development Conference Draft Statement on Gastrointestinal Surgery for Severe Obesity, the bariatric surgery become accepted by the medical community as the most long-term efficient procedure for the treatment of morbid obesity. The surgical suggestion is based mainly in the Body Mass Index of the patient wight/height (kg/m2). Bariatric surgical techniques can be classified according to their main mechanism of action in: restrictives (adjustable gastric banding, sleeve gastrectomy, open vertical banded gastroplasty), malabsorptives: biliopancreatic derivation Scopinaro type or biliopancreatic derivation with duodenal switch (Marceau) and finally the Roux-en-Y gastric bypass. All these aspects are treated in the article.

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INTRODUCTION: The management of patients with gallstone disease and ductal calculi is controversial. The main options are one-stage or two-stage management. MATERIAL AND METHOD: We performed a retrospective analysis of the experience gained over 10 years in the one-stage management of common duct stones in a high-volume tertiary hospital. RESULTS: A total of 569 patients were initially treated by laparoscopy. Of these, 412 (76.3%) underwent the transcystic approach, 128 (23.7%) underwent laparoscopic choledochotomy and 29 (5%) were converted to open surgery. Overall morbidity and mortality were 2.46% and 0.52%, respectively. CONCLUSIONS: In high-volume centers, one-stage laparoscopic management of common duct stones is safe and feasible, with a high proportion of patients that only require a transcystic approach.

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