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Accumulation of visceral adipose tissue is associated with metabolic syndrome (MS), insulin resistance, and dyslipidemia. Here we examined several morphometric and biochemical parameters linked to MS in a rodent litter size reduction model, and how a 30-day fish oil (FO) supplementation affected these parameters. On day 3 post-birth, pups were divided into groups of ten or three. On day 22, rats were split into control (C) and small litter (SL) until 60 days old. Then, after metabolic disturbance and obesity were confirmed, FO supplementation started for 30 days and the new groups were named control (C), FO supplemented (FO), obese (Ob), and obese FO supplemented (ObFO). Comparison was performed by Student t-test or 2-way ANOVA followed by Tukey post hoc test. At the end of the 60-day period, SL rats were hyperphagic, obese, hypoinsulinemic, normoglycemic, and had high visceral fat depot and high interleukin (IL)-6 plasma concentration. Obese rats at 90 days of age were fatter, hyperphagic, hyperglycemic, hypertriacylgliceromic, hipoinsulinemic, with low innate immune response. IL-6 production ex vivo was higher, but in plasma it was not different from the control group. FO supplementation brought all biochemical changes to normal values, normalized food intake, and reduced body weight and fat mass in obese rats. The innate immune response was improved but still not as efficient as in lean animals. Our results suggested that as soon MS appears, FO supplementation must be used to ameliorate the morpho- and biochemical effects caused by MS and improve the innate immune response.

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INTRODUCTION: The objective is to produce an average brain activation mapping template in healthy children using functional magnetic resonance imaging (fMRI), with specific paradigms for activating inhibitory attention and working memory functions. SUBJECTS AND METHODS: A nutritional and neuropsychological evaluation was performed on 87 right-handed children. The inclusion criteria were met by 30 children (15 boys and 15 girls) between 9 and 11 years old, who were studied with fMRI in two inhibitory attention tests (Go/No Go), with food cues, a working memory test (Continuous Performance Test Identical Pairs) and measurement of anatomical volumes. These data were subsequently processed with the FSL-v5 program, with a threshold of p < 0.05 (cluster-wise). The brain areas activated were located using a standard Montreal Neurological Institute brain template and the Harvard-Oxford structural cortical atlas. RESULTS: The inhibitory attention tests showed activation frontal areas predominantly on the right, and the cingulate, parietal and occipital areas, with preponderance in occipital areas in the food cues test. In the Continuous Performance Test-Identical Pairs test, activation was obtained predominantly in the occipital, frontal and parietal areas. CONCLUSIONS: Brain activity mapping templates are obtained in healthy children with tests for inhibitory attention, food cues and working memory. The activation areas are mostly those reported in the literature. This provides baseline brain activation patterns for studying pathologies related to inhibitory attention, impulsivity and working memory.

TITLE: Mapeo neuroanatómico de atención inhibitoria y memoria de trabajo con resonancia magnética funcional en niños sanos.Introducción. El objetivo es lograr una plantilla de mapeo de activación cerebral promedio en niños sanos usando la resonancia magnética funcional (RMf), con paradigmas específicos para activar funciones de atención inhibitoria y de memoria de trabajo. Sujetos y métodos. Se realizó una evaluación nutricional y neuropsicológica a 87 niños diestros. Cumplieron los criterios de inclusión 30 (15 niños y 15 niñas) entre 9 y 11 años, a quienes se estudió con RMf con realización de dos pruebas de atención inhibitoria (Go/No Go), con letras e imágenes de alimentos, un test de memoria de trabajo (Test de Atención Continua-Pares Idénticos) y obtención de volúmenes anatómicos. Los datos posteriormente se procesaron con el programa FSL-v5 con un umbral de p < 0,05 (cluster-wise). Las áreas cerebrales activadas se localizaron utilizando una plantilla cerebral estándar del Montreal Neurological Institute y el atlas cortical estructural de Harvard-Oxford. Resultados. En las pruebas de atención inhibitoria hay activación en áreas frontales de predominio derecho, cíngulo, parietales y occipitales, con preponderancia en áreas occipitales en la prueba con alimentos. En la prueba Test de Atención Continua-Pares Idénticos se obtuvo activación de predominio en áreas occipitales, frontales y parietales. Conclusiones. Se obtienen plantillas de mapeo de actividad cerebral en niños sanos con test de atención inhibitoria, de alimentos y de memoria de trabajo. Las áreas de activación corresponden mayoritariamente a las descritas en la bibliografía. Esto nos permite tener patrones basales de activación cerebral para estudiar patologías relacionadas con la atención inhibitoria, la impulsividad y la memoria de trabajo.

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Los procedimientos intratimpánicos se realizan frecuentemente de manera ambulatoria en los policlínicos de otorrinolaringología. Dada la inervación de la membrana timpánica, estos procedimientos generan disconfort y dolor, por lo que la aplicación previa de anestésicos tópicos sobre la membrana timpánica y el conducto auditivo externo es habitual. Pese a su uso, no hay evidencia clara sobre la efectividad de estos y el correcto modo de aplicación. Se realizó una revisión de la literatura sobre la aplicación y uso de anestésicos tópicos previo a procedimientos intratimpánicos, donde pudimos concluir que actualmente no hay un estándar de oro para prevenir el dolor en los pacientes sometidos a procedimientos intratimpánicos, ya que en la mayoría de los estudios no se logró diferencia significativa entre el uso de anestésicos tópicos v/s placebo, al comparar dolor a los 5 y 45 minutos post procedimiento.

A literature review was performed to assess the use and efficacy of topical anesthetics in intratympanic procedures. The analysis led to the conclusion that a gold standard for pain prevention procedures is still lacking, as the majority of studies revised did not show statically significant differences between the use of topic anesthetics and placebo when compared pain at 5 and 45 minutes after procedures.

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Accumulation of visceral adipose tissue is associated with metabolic syndrome (MS), insulin resistance, and dyslipidemia. Here we examined several morphometric and biochemical parameters linked to MS in a rodent litter size reduction model, and how a 30-day fish oil (FO) supplementation affected these parameters. On day 3 post-birth, pups were divided into groups of ten or three. On day 22, rats were split into control (C) and small litter (SL) until 60 days old. Then, after metabolic disturbance and obesity were confirmed, FO supplementation started for 30 days and the new groups were named control (C), FO supplemented (FO), obese (Ob), and obese FO supplemented (ObFO). Comparison was performed by Student t-test or 2-way ANOVA followed by Tukey post hoc test. At the end of the 60-day period, SL rats were hyperphagic, obese, hypoinsulinemic, normoglycemic, and had high visceral fat depot and high interleukin (IL)-6 plasma concentration. Obese rats at 90 days of age were fatter, hyperphagic, hyperglycemic, hypertriacylgliceromic, hipoinsulinemic, with low innate immune response. IL-6 production ex vivo was higher, but in plasma it was not different from the control group. FO supplementation brought all biochemical changes to normal values, normalized food intake, and reduced body weight and fat mass in obese rats. The innate immune response was improved but still not as efficient as in lean animals. Our results suggested that as soon MS appears, FO supplementation must be used to ameliorate the morpho- and biochemical effects caused by MS and improve the innate immune response.

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INTRODUCTION: revision total knee arthroplasty (TKA) is a challenging procedure that requires proper alignment, restoration of bone loss, and prevention of instability. Modern revision systems offer progressive implant constriction with multiple options for offset, augmentation, and fixation stems. OBJECTIVE: to evaluate the clinical outcomes of a modular implant with hybrid fixation in revision TKA with a minimum follow-up of two years. MATERIAL AND METHODS: we retrospectively included all revision TKA surgeries performed between September 2018 and September 2019, using the same implant. Patient demographics, comorbidities, and data on bone defects were recorded. Clinical outcomes were assessed using subjective roles and Maudsley scores and the Knee Society Score (KSS). Complications during follow-up were also documented. RESULTS: a total of 23 patients were analyzed, comprising 65% females and 35% males, with a median age of 71.1 years. Bone defects following implant removal were classified as F2.T2 in 39.13% of cases, F1.T2 in 8.69%, and F1.T1 in the remaining 52.17%. There were significant improvements in the KSS score (preoperative: 53 points, postoperative: 79 points; p < 0.001). Three (13%) complications were reported, two of which were directly related to the surgery, and two patients required subsequent revision surgery. The 2-year survival rate was 91.3%. CONCLUSION: the use of a modular implant with hybrid fixation in revision TKA demonstrated a high 2-year survival rate, significant improvements in clinical scores, and a low incidence of short-term complications. These findings support the efficacy and safety of this approach, providing favorable clinical outcomes and high patient satisfaction.

INTRODUCCIÓN: la artroplastía total de rodilla (ATR) de revisión es un procedimiento desafiante que requiere alineación adecuada, restauración ósea y estabilidad. Los sistemas modernos de revisión ofrecen opciones de implantes modulares con fijación híbrida. OBJETIVO: evaluar los resultados clínicos de un implante modular de fijación híbrida con seguimiento mínimo de dos años. MATERIAL Y MÉTODOS: se incluyeron retrospectivamente cirugías de revisión de ATR realizadas entre Septiembre de 2018 y Septiembre de 2019 con el mismo implante. Se registraron datos demográficos, comorbilidades y se evaluaron los resultados clínicos utilizando puntuaciones subjetivas y la Knee Society Score (KSS). RESULTADOS: se analizaron 23 pacientes (65% mujeres, 35% hombres; edad mediana: 71.1 años). Los defectos óseos posteriores a la extracción del implante se clasificaron como F2.T2 en 39.13% de los casos, F1.T2 en 8.69%, y F1.T1 en 52.17%. Se observaron mejoras significativas en la puntuación de la KSS (preoperatoria: 53 puntos, postoperatoria: 79 puntos; p < 0.001). Se registraron tres (13%) complicaciones totales, dos relacionadas directamente con la cirugía, y dos casos requirieron una nueva cirugía de revisión. La tasa de supervivencia a los dos años fue de 91.3%. CONCLUSIÓN: el uso del implante modular con fijación híbrida en la revisión de ATR mostró una alta tasa de supervivencia a dos años, mejoras significativas en las puntuaciones clínicas y baja incidencia de complicaciones a corto plazo. Estos resultados respaldan la eficacia y seguridad de este enfoque, proporcionando resultados clínicos favorables y alta satisfacción del paciente.

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INTRODUCTION AND AIM: Hepatocellular carcinoma (HCC) is the third most frequent cancer of digestive tract tumors in Peru, with a high mortality rate of 17.7 per 100,000 inhabitants. A significant number of HCC cases in Peru do not follow the classic clinical epidemiology of the disease described in other parts of the world. Those patients present with a distinct transcriptome profile and a singular tumor process, suggesting a particular type of hepatocarcinogenesis in a portion of the Peruvian population. Our aim was to understand the clinical and biologic involvement of the epigenetic profile (methylation) and gene expression (transcriptome) of HCC in Peruvian patients. METHODS: HCC and liver transcriptome and DNA methylation profiles were evaluated in 74 Peruvian patients. RESULTS: When grouped by age, there was greater DNA methylation in younger patients with HCC but no differences with respect to the transcriptomic profile. A high prevalence of the hepatitis B virus (HBV) (>90%) was also observed in the younger patients with HCC. Enrichment analyses in both molecular profiles pinpointed PRC2 as an important molecular effector of that liver tumor process in Peruvian patients. CONCLUSION: HCC in Peruvian patients has a unique molecular profile, associated with the presence of HBV, as well as overall DNA hypermethylation related to undifferentiated liver cells or cellular reprogramming.

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Resumen Introducción: Los cuerpos extraños (CE) en oído, nariz y vía aéreodigestiva superior son el 30% de las urgencia en otorrinolaringología (ORL). No existen datos epidemiológicos nacionales que describan la casuística de CE. Objetivo: Describir la epidemiología de pacientes con diagnóstico de CE evaluados, entre el 2013-2018 en Clínica Santa María de Santiago, Chile. Describir las características de los CE, ubicación, método de extracción y complicaciones. Material y Método: Estudio descriptivo y retrospectivo, basado en revisión de fichas clínicas de pacientes con diagnóstico de CE, analizando variables epidemiológicas y clínicas. Resultados: Se revisaron 1.847 casos con diagnóstico de CE, confirmando 1.494. La mayoría de sexo masculino (53,3%), con un promedio de edad de 16,5 años (rango de 0-95 años). Los CE más prevalentes fueron ótico (52,9%) y nasal (27,9%). El síntoma asociado más frecuente fue la sensación de CE (18,1%). El diagnóstico fue principalmente por examen físico (84%), requiriéndose exámenes complementarios en 18,2%. La extracción fue ambulatoria en su mayoría (84,6%), requiriendo extracción en pabellón el 12,5%. El 5,5% presentó complicaciones, y la tasa de letalidad fue de 0,07%. Conclusión: Esta casuística, única a nivel nacional, nos permite conocer la epidemiología de los CE. Un bajo porcentaje de pacientes fue de riesgo vital, pero el manejo oportuno permite una baja tasa de complicaciones y letalidad.

Abstract Introduction: Foreign bodies (FB) in the ear, nose and upper airway-digestive tract are 30% of the emergencies in otolaryngology (ORL). There is no national epidemiological data that describes the FB casuistry. Aim: To describe the epidemiology of patients who have a diagnosis of a FB evaluated, between 2013-2018, at Santa María Clinic in Santiago, Chile. To describe the characteristics of FB, location, method of removal, and complications. Material and Method: A descriptive and retrospective study, based on review of clinical records of patients with the diagnosis of FB, analyzing epidemiological and clinical variables. Results: 1847 cases with a diagnosis of FB were reviewed, of which 1494 were confirmed. Most were male (53.3%), with an average age of 16.5 years (range 0-95 years). The most prevalent FB locations were otic (52.9%) and nasal (27.9%). The most frequent associated symptom was sensation of a FB (18.1%). The diagnosis was fundamentally based on physical examination (84%), requiring complementary tools in 18.2%. The extraction was mostly ambulatory (84.6%), requiring extraction in the operation room in 12.5%. 5.5% presented complications, and the fatality rate was 0.07%. Conclusion: This casuistry is unique at the national level, and allows us to know the epidemiology of FB. A low percentage of patients correspond to life-threatening locations, but timely management allows a low rate of complications and fatality.

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INTRODUCTION: The SARS-CoV-2 virus that causes the COVID-19 disease is transmitted through the inhalation of droplets or aerosols and inoculation via the oronasal or ocular routes, transforming the management of swallowing disorders into a challenge for healthcare teams, given their proximity to the aerodigestive tract and the high probability of aerosol generation during patient evaluation and treatment. AIM: To provide essential guidance for Latin American multidisciplinary teams, regarding the evaluation and treatment of oropharyngeal and esophageal dysphagia, at the different levels of healthcare. The position statement was formulated for the purpose of maintaining medical service continuity, in the context of a pandemic, and minimizing the propagation and infection risks of the virus. METHODS: Thirteen experts in swallowing disorders were summoned by the Latin American Dysphagia Society to formulate a series of clinical suggestions, based on available evidence and clinical experience, for the management of dysphagia, taking the characteristics of Latin American healthcare systems into account. RESULTS: The position statement of the Latin American Dysphagia Society provides a series of clinical suggestions directed at the multidisciplinary teams that manage patients with oropharyngeal and esophageal dysphagia. It presents guidelines for evaluation and treatment in different contexts, from hospitalization to home care. CONCLUSIONS: The present statement should be analyzed by each team or healthcare professional, to reduce the risk for COVID-19 infection and achieve the best therapeutic results, while at the same time, being mindful of the reality of each Latin American country.

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INTRODUCTION: The SARS-CoV-2 virus that causes the COVID-19 disease is transmitted through the inhalation of droplets or aerosols and inoculation via the oronasal or ocular routes, transforming the management of swallowing disorders into a challenge for healthcare teams, given their proximity to the aerodigestive tract and the high probability of aerosol generation during patient evaluation and treatment. AIM: To provide essential guidance for Latin American multidisciplinary teams, regarding the evaluation and treatment of oropharyngeal and esophageal dysphagia, at the different levels of healthcare. The position statement was formulated for the purpose of maintaining medical service continuity, in the context of a pandemic, and minimizing the propagation and infection risks of the virus. METHODS: Thirteen experts in swallowing disorders were summoned by the Latin American Dysphagia Society to formulate a series of clinical suggestions, based on available evidence and clinical experience, for the management of dysphagia, taking the characteristics of Latin American healthcare systems into account. RESULTS: The position statement of the Latin American Dysphagia Society provides a series of clinical suggestions directed at the multidisciplinary teams that manage patients with oropharyngeal and esophageal dysphagia. It presents guidelines for evaluation and treatment in different contexts, from hospitalization to home care. CONCLUSIONS: The present statement should be analyzed by each team or healthcare professional, to reduce the risk for COVID-19 infection and achieve the best therapeutic results, while at the same time, being mindful of the reality of each Latin American country.

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We evaluated the potential for mosquitoes collected in the Amazon Basin, near Iquitos, Peru, to become infected with and transmit Murutucu (MURV) and Itaqui viruses (ITQV) (Order Bunyavirales, Family: Peribunyaviridae, Genus: Orthobunyavirus). Viremia levels in Syrian hamsters peaked 2 d after infection with either virus, and both viruses were highly lethal in hamsters with virtually all hamsters dying prior to 3-d postinfection. For almost all of the mosquito species tested some individuals were susceptible to infection and some developed a disseminated infection after oral exposure to either MURV or ITQV. However, only the Culex species (Culex (Culex) coronator Dyar and Knab [Diptera, Culicidae], Culex (Melanoconian) gnomatos Sallum, Huchings, and Ferreira [Diptera, Culicidae], Culex (Mel.) pedroi Sirivanakarn and Belkin [Diptera, Culicidae], and Culex (Mel.) vomerifer Komp [Diptera, Culicidae]) successfully transmitted virus by bite. However, even among these species, only about 37% of the individuals with a disseminated infection successfully transmitted these viruses, indicating a significant salivary gland barrier. Although little is known about the medical or veterinary importance of many members of the genus Orthobunyavirus, we have demonstrated that Culex spp. (Diptera, Culicidae) could be potential vectors.

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Resumen La otalgia es un motivo de consulta frecuente en otorrinolaringología que se puede clasificar en dos tipos: primaria y secundaria. La otalgia primaria es una consecuencia de una enfermedad otológica mientras que la secundaria o referida, surge de procesos patológicos que se originan en estructuras distintas del oído, pero que comparten vías neuronales comunes. Estas vías la componen los nervios craneales V, VII, IX y X y los nervios cervicales C2 y C3. Las causas más comunes de otalgia secundaria son la patología musculoesquelética como la disfunción de la articulación temporomandibular y el síndrome miofascial, la patología dental y las infecciones orofaríngeas. Para encontrar la etiología de la otalgia secundaria, en la mayoría de los casos, una historia clínica y examen físico acucioso resultarán suficientes, sin embargo, existe un grupo de pacientes con factores de riesgo que pudiesen requerir estudios adicionales. El objetivo de esta revisión es otorgar herramientas al lector para comprender los distintos procesos involucrados en la otalgia secundaria, conocer las patologías más relevantes relacionadas y de esta forma entregar al clínico una pauta para enfrentar este motivo de consulta.

Abstract Otalgia is a common reason for consultation in otolaryngology and can be classified into two types: primary or secondary otalgia. Primary otalgia is a consequence of an otological disease while secondary otalgia arises from pathological processes that originate in other structures different than the ears, but share common neuronal pathways. These pathways involve cranial nerves V, VII, IX and X and cervical nerves C2 and C3. The most common causes of secondary otalgia are musculoskeletal pathology such as temporomandibular joint dysfunction and myofascial syndrome, dental pathology and oropharyngeal infections. To find the etiology of secondary otalgia, in most cases a medical history and physical examination will be sufficient, however there is a group of patients with risk factors that may require additional studies. The objective of this review is to give the reader tools to understand the different processes involved in secondary otalgia, know the most relevant related pathologies and thus give the clinician a guide to deal with this problem.

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Resumen Los pacientes trasplantados presentan mayor vulnerabilidad a complicaciones infecciosas, no solo debido al uso de drogas inmunosupresoras, sino que también, a las enfermedades subyacentes que presentan y a la falla de órganos primarios. A pesar de que las infecciones otorrinolaringológicas no son frecuentes en estos pacientes, es importante establecer un adecuado estudio y tratamiento de ellas. A través del siguiente artículo se aportan directrices en el estudio pretrasplante desde un enfoque otorrinolaringológico, generando recomendaciones de acuerdo a la patología del paciente y el órgano a trasplantar. Si bien, las recomendaciones se realizan según evaluación rinosinusal, otológica y faringoamigdalina, una adecuada anamnesis y examen físico son los pilares de la evaluación pretrasplante en otorrinolaringología, reservándose el estudio con imágenes para aquellos pacientes con alteraciones sospechosas.

Abstract Transplanted patients have higher frequency of infectious complications, not only due to the use of immunosuppressive drugs, but also the underlying diseases that present and the failure of primary organs. Although ear, nose and throat (ENT) infections are not frequent in these patients, it is important to establish an adequate study and treatment of them. Through the following article, guidelines are provided in the pretransplant study from an ENT approach, generating recommendations according to the pathology of the patient and the organ to be transplanted. Although, the recommendations are made according to rhinosinusal, otological and pharyngotonsiline evaluation, adequate anamnesis and physical examination are the pillars of the pretransplant evaluation in otolaryngology, reserving the study with images for patients with suspicious alterations.

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Resumen Los pacientes con COVID-19 pueden presentar dificultades en la alimentación por distintos factores, entre los que destacan el aumento del esfuerzo respiratorio, uso de dispositivos de apoyo ventilatorio, compromiso neurológico y disfagia postextubación. La evaluación clínica es fundamental, pero debe ser realizada con precaución y con elementos de protección personal, ya que es un procedimiento generador de aerosoles, al igual que la evaluación instrumental mediante videofluoroscopía y evaluación fibroendoscópica de la deglución. Las recomendaciones de manejo deben basarse en la evaluación clínica adaptada, tanto para pacientes ambulatorios como hospitalizados, y debe incluir el manejo nutricional, compensatorio y el seguimiento clínico periódico para evitar las consecuencias de la disfagia orofaríngea, y así disminuir la tasa de neumonía aspirativa, causa importante de morbimortalidad.

Abstract Patients with COVID-19 may present feeding difficulties due to different factors, like the increase in respiratory effort, use of ventilatory support devices, neurological compromise and post-extubation dysphagia. Clinical evaluation is essential, but it must be carried out with caution and using personal protection elements, since it is an aerosol-generating procedure, as well as the instrumental evaluation by videofluoroscopy and fiberoptic endoscopic evaluation of swallowing. Treatment should be based on adapted clinical evaluation, for both outpatients and hospitalized patients, and should include nutritional treatment, compensatory management and periodic clinical follow-up to avoid the consequences of oropharyngeal dysphagia and decrease the rate of aspiration pneumonia major cause of morbidity and mortality.

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Resumen Introducción: Uno de los mayores avances de las últimas décadas en la cirugía de tórax ha sido el desarrollo de la cirugía mínimamente invasiva. Objetivos: Describir la experiencia en videotoracoscopía (VATS) Uniportal de miembros del equipo de Cirugía de Tórax de la Universidad de Chile en 2 campos clínicos, (Clínica Las Condes y Hospital Clínico de la Universidad de Chile). Materiales y Método: Se estudiaron 105 pacientes sometidos a VATS uniportal entre enero de 2016 y enero de 2019. Los datos se analizaron de manera retrospectiva considerando variables demográficas (edad, sexo) y clínicas (diagnóstico, cirugía, estadía hospitalaria, días de pleurostomía, conversión y complicaciones). Resultados: De las 105 cirugías realizadas, 28 (26,6%) correspondieron a cirugías mayores complejas lobectomías y segmentectomías anatómicas. En 4 pacientes se agregó un 2° puerto, uno se convirtió a minitoracotomía y uno a toracotomía (5,7% conversión global). La estadía hospitalaria fue en promedio 3,07 ± 3,1 días y el promedio de mantención de pleurostomía de 2,67 ± 1,61 días. Siete pacientes (6,6%) presentaron complicaciones postoperatorias. Un paciente falleció por progresión de su enfermedad, no hubo mortalidad relacionada a la cirugía. Discusión: Las contraindicaciones de la VATS uniportal son las mismas que en la VATS multipuerto. En manos experimentadas, las complicaciones en cirugía por puerto único son bajas. Impresiona tener menos dolor postoperatorio, menor estadía hospitalaria y reintegración precoz a las actividades diarias comparado con la VATS tradicional. Conclusiones: Se presenta la primera serie de VATS uniportal publicada en Chile. Los resultados obtenidos son comparables a los observados en la literatura. Su implementación y desarrollo requiere de una curva de aprendizaje similar a cualquier nueva técnica quirúrgica.

Objective: To describe the initial results with uniportal Video-Thoracoscopic Surgery (VATS) performed in two campuses by members of the Section of Thoracic Surgery of the University of Chile ("Clínica Las Condes" and University of Chile Clinical Hospital). Materials and Method: Between January 2016 and January 2019, a total of 105 patients underwent uniportal VATS. Clinical data was collected retrospectively from digital records including demographic (age, sex) and clinical variables (diagnosis, surgery, duration of the chest tube, length of stay, conversion rate and postoperative complications). Results: Uniportal VATS was performed on 105 patients during the study period. Twenty-eight cases (26.6%) corresponded to lobectomy or anatomic segmentectomy. In 4 cases a 2nd port was required, 1 patient had to be converted to mini-thoracotomy and 1 to thoracotomy (5.8% global conversion). Overall, the median length of stay was 3.07 ± 3.1 days and the median duration of chest tube drainage was 2.67 ± 1.61 days. Seven patients (6.6%) presented complications. One patient died due to progression of his disease, there were no deaths related to the procedures. Discussion: Uniportal VATS has similar indications than multiportal VATS. On experienced hands, uniportal VATS has a low morbidity rate. Uniportal VATS appears to produce less post-operative pain, with shorter hospital stay and a faster return to normal life compared to standard VATS. Conclusion: We present the first uniportal VATS series in Chile. Results were similar to published series. Implementation and development of uniportal VATS requires a learning curve similar to any new surgical procedure.

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INTRODUCCIÓN: El gasto de bolsillo en medicamentos e insumos puede afectar financieramente los hogares. Objetivo: Determinar el gasto de bolsillo en medicamentos e insumos en Perú y las características de la población con mayor gasto de este tipo en los años 2007 y 2016. MÉTODOS: Estudio transversal analítico de la Encuesta Nacional de Hogares sobre Condiciones de Vida y Pobreza 2007 y 2016. Se determinó la media y mediana del gasto de bolsillo en medicamentos e insumos en dólares americanos para la población general, y según la presencia de factores descritos en la literatura como asociados al gasto de bolsillo en medicamentos e insumos. RESULTADOS: Se incluyeron datos de 92 148 encuestados en 2007 y de 130 296 en 2016. En 2007, se encontró una mediana de 3,19 (rango intercuartílico: 0,96 a 7,99) y una media de 8,14 (intervalo de confianza 95%: 7,80 a 8,49) para el gasto de bolsillo en medicamentos. En 2016, la mediana y media de este gasto fueron de 3,55 (rango intercuartílico: 1,48 a 8,88) y 9,68 (intervalo de confianza 95%: 9,37 a 9,99), respectivamente. Para 2016, se encontró un mayor gasto de bolsillo en medicamentos en mujeres, menores de cinco y mayores de 60 años; personas de mayor nivel educativo; tener seguro privado o de las fuerzas armadas; vivir en la región costa y en zona urbana; tener una enfermedad crónica; y ser de los quintiles de gasto per cápita más altos. Entre 2007 y 2016, se incrementó significativamente (p < 0,05) el gasto de bolsillo en medicamentos e insumos en los menores de cinco años (p < 0,001), personas no aseguradas (p < 0,001), asegurados en el Seguro Integral de Salud (p < 0,001) o a las fuerzas armadas, para el área urbana y rural (p < 0,001, ambos), y en personas sin enfermedades crónicas (p < 0,001). CONCLUSIONES: Se obtuvo el gasto de bolsillo en medicamentos e insumos en población peruana en 2007 y 2016, encontrándose un incremento del mismo entre los años de estudio, existiendo grupos poblacionales con mayor gasto y con aumentos significativos. Se requiere profundizar el estudio de factores asociados al gasto de bolsillo en medicamentos en grupos de mayor vulnerabilidad económico frente al gasto directo en salud en Perú.

BACKGROUND: Out-of-pocket spending on medicines and supplies can lead to a heavy financial burden in households. OBJECTIVE: To determine the out-of-pocket spending on medicines and supplies in Peru and the population groups with the highest out-of-pocket spending on medicines and supplies in 2007 and 2016. METHODS: We conducted an analytical cross-sectional study of the Peruvian National Household Survey on Living and Poverty Conditions for the years 2007 and 2016. Mean and median out-of-pocket spending on medicines and supplies are reported in USD for the general population, and according to the presence or not of factors described in the literature as associated with out-of-pocket spending on medicines and supplies. RESULTS: 92 148 and 130 296 participants from 2007 and 2016 were included. In 2007, a median of 3.19 (interquartile range: 0.96 to 7.99) and an average of 8.14 (95% confidence interval: 7.80 to 8.49) were found for the out-of-pocket spending on medicines and supplies. In 2016, the median and mean out-of-pocket spending on medicines and supplies were 3.55 (interquartile range: 1.48 to 8.88) and 9.68 (95% confidence interval: 9.37 to 9.99), respectively. For 2016, higher out-of-pocket spending on medicines and supplies was found in women, children under five and over 60 years of age, people of higher educational level, having private or armed forces insurance, living in the coastal region, and being in one of the highest per capita quintile of expenditure. Between 2007 and 2016, the out-of-pocket spending on medicines and supplies was significantly increased in children under five (p < 0.001), uninsured persons (p < 0.001), insured to the Seguro Integral de Salud (p < 0.001) or the Armed Forces (p = 0.035), for the urban and rural area (both p < 0.001), and in people without chronic diseases (p < 0.001). CONCLUSIONS: An increase in out-of-pocket spending on medicines and supplies was found in the study period. There were population groups with significant increases in out-of-pocket spending on medicines and supplies. It is necessary to explore further the factors associated with out-of-pocket spending on medicines and supplies in groups of greater economic vulnerability regarding direct health spending in Peru.

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INTRODUCTION: A large number of patients have chronic back pain, producing disability. Consequently, there is a need to validate instruments for pain measurement. The aim of this study was to determine the validity and reliability of the Oswestry Disability Scale for Low Back Pain in the population with chronic back pain in Cienfuegos. MATERIAL AND METHOD: The investigation consisted of the development of an instrument to validate the scale through content validity, construct validity and reliability analysis. The validation included linguistic and cultural adaptation of the instrument. The study was conducted at the Dr. Gustavo Aldereguía Lima University Hospital in Cienfuegos, Cuba, from September 2017 to October 2018. Systematic randomised sampling was used. The sample included 162 patients. The statistical analysis was performed with the SPSS statistical package. RESULTS: The experts considered that the instrument should remain unchanged. Factorial analysis identified the presence of three intercorrelated factors that represented 63% of the total. A global Cronbach α of 0.801 was obtained and the temporal stability of the instrument was demonstrated. CONCLUSIONS: The results confirm the validity and reliability of the Oswestry Disability Scale for Low Back Pain in the Cienfuegan population with chronic back pain.

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Previous studies found that calcium sensing receptor (CaSR) it's expressed in intercalated cells of the collecting duct and that its activation by calcium in the luminal membrane promotes acidification of urine. Therefore, the aim of the study was to analyze the effects of CaSR stimulus on the biochemical activity of the vacuolar H+-ATPase in a cellular model of intercalated cells, MDCK-C11 cells. Biochemical activity of H+-ATPase was performed using cell homogenates and the inorganic phosphate released was determined by a colorimetric method. Changes in cytosolic ionized calcium ([Ca2+]i) were also determined using Fluo-4. A significant increase of vacuolar H+-ATPase activity was observed when the CaSR was stimulated with agonists such as Gd3+ (300 µM), neomycin (200 µM) and by the calcimimetic R-568 (1 µM). This activity was also stimulated in a dose-dependent fashion by changes in extracellular Ca2+ concentration ([Ca2+]o) between 10-2 and 2 mM. The calciolytic NPS 2143 (150 nM) significantly reduced the vacuolar H+-ATPase activity observed with 2 mM [Ca2+]o. Inhibition of phospholipase C (PLC) activity with U73122 (5 x 10-7 M) reversed the increase in pump activity observed in the presence of Gd3+. Activation of CaSR by the specific CaSR agonist R-568 produced a sustained rise of [Ca2+]i, an effect that disappears when extracellular calcium was removed in the presence of thapsigargin. In summary, CaSR stimulation induces an increase in the vacuolar H+-ATPase activity of MDCK-C11 cells, an effect that involves an increase in [Ca2+]i and require PLC activity. The consequent decrease in intratubular pH could lead to increase ionization of luminal calcium, potentially reducing the formation of calcium phosphate stones.

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BACKGROUND: Salmonella Heidelberg (S. Heidelberg) causes gastroenteritis and sometimes bacteremia and endocarditis. In other countries, this serovar has multidrug resistance including extended-spectrum ß-lactamases (ESBLs) and AmpC (ß-lactamases (AmpC), associated with the blaCMY-2 gene. In Chile, an outbreak by S. Heidelberg occurred in 2011, the phenotypic and genetic characteristics of Chilean strains are unknown. AIM: To determine the antimicrobial susceptibility, presence of plasmids and virulence factor genes in S. Heidelberg strains isolated in Chile over the period 2006-2011. MATERIAL AND METHODS: In sixty-one S. Heidelberg clinical and environmental strains collected by the Public Health Institute in Chile during 2006-2011, antimicrobial susceptibility, plasmids and virulence factor genes (invA, sifA, pefA, agfA, lpfA and, stkD) were studied. RESULTS: S. Heidelberg had a high susceptibility to sulfamethoxazole-trimethoprim, gentamicin, ceftriaxone, ceftiofur, chloramphenicol, amoxicillin-clavulanic acid and ampicillin. However, 52% had decreased susceptibility to ciprofloxacin and 33% resistance to tetracycline. ESBLs were detected in three strains isolated from blood cultures, environment and human feces. The latter strain was positive for AmpC and blaCMY-2 gene. Fifty three of 61 strains showed one to seven plasmids of 0.8 to approximately 30 kb. Most plasmids were small with sizes between 0.8 and 2 kb. All isolates were positive for all genes except pefA. CONCLUSIONS: S. Heidelberg isolated from Chilean samples was susceptible to first-line antimicrobials, except tetracycline and ciprofloxacin. The emergence of strains with ESBLs and AmpC should be a warning. The strains were homogeneous for virulence genes, but heterogeneous in their plasmids.

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