Abstract: SARS-CoV-2 infection can trigger the occurrence of numerous pathologies, some of them endocrinological. The present narrative review works on the association between COVID-19 and subacute thyroiditis, which describes epidemiological and pathophysiological aspects, clinical and laboratory manifestations, treatment, and prognosis. The prevalence of thyroid dysfunction in COVID-19 patients fluctuates between 13 and 64%, explicitly concerning subacute thyroiditis; it has been described as a change in prevalence from 0.5% to 10% between 2019 and 2020. The binding of the SARS-CoV-2 virus with the angiotensin-converting enzyme 2 receptor (ACE-2) widely expressed in the thyroid gland causes subacute thyroiditis, generating thyrotoxicosis-like clinical manifestations. However, the presentation of subacute thyroiditis associated with COVID-19 may be atypical. The central elements of the treatment are similar to those used in any subacute thyroiditis. We conclude that this entity must be considered in differential diagnoses of patients currently or previously infected with SARS-CoV-2 that present a febrile syndrome, elevated inflammatory parameters, or persistent tachycardia without a specified aetiology.

Resumen: La infección por SARS-CoV-2 podría gatillar la ocurrencia de numerosas patologías, algunas de ellas de tipo endocrinológico. Se presenta una revisión narrativa sobre la asociación entre COVID-19 y tiroiditis subaguda, en la que se describen aspectos epidemiológicos, fisiopatológicos, manifestaciones clínicas y de laboratorio, tratamiento y pronóstico. La prevalencia de alguna disfunción tiroidea en pacientes COVID-19 fluctúa entre 13 y 64%, específicamente en relación con tiroiditis subaguda se describe un cambio en la prevalencia de 0,5% a 10% entre los años 2019 y 2020. La tiroiditis subaguda se produce por la unión del virus SARS-CoV-2 con la enzima convertidora de angiotensina 2 (ACE-2) ampliamente expresada en la glándula tiroides, generando manifestaciones clínicas tipo tirotoxicosis, aunque la presentación de la tiroiditis subaguda asociada a COVID-19 puede ser atípica. Los elementos centrales del tratamiento son similares a los empleados ante cualquier tiroiditis subaguda. Se concluye la necesidad de considerar esta entidad en el diagnóstico diferencial de pacientes actual o previamente infectados por SARS-CoV-2 que presenten síndrome febril, elevación de parámetros inflamatorios o taquicardia persistente, sin etiología precisada.

Abstract: One of the fundamental components of smart cities is the smart grid characterized by various information and operational technologies that guarantee reliable and clean energy supply. For this reason, they are a fundamental pillar for achieving sustainability in the world in which we live. Despite the enormous advantages of the smart grid, it has quite a few challenges; one that has been fundamental in recent years is cybersecurity. The traditional approach to address cybersecurity issues generally does not consider the human factor as the main component. Recently, the concept of cyber hygiene has emerged, where the social and human aspect is fundamental since in the same similarity with traditional hygiene, the fact of carrying out personal care practices can contribute to improving people’s health, in this sense, having better personal cybersecurity practices will allow for better cybersecurity performance of systems. This work shows the implementation of cyber hygiene in the context of smart grid, showing a methodology to carry it out and applying it in the context of smart metering systems. The results show that the proposed method can successfully be used in the smart grid and can be applied to other contexts.

Abstract: Central precocious puberty is the premature activation of the hypothalamic-pituitary-gonadal axis, leading to an early epiphyseal fusion and, in many cases, heights below the genetic target. Therefore, a proper adult stature prediction is essential for the treatment decision. Objective: To compare the concordance of final height using height prediction made by two validated methods versus the ge netic target height in girls who consulted due to central precocious puberty. Patients and Method: Retrospective, non-concurrent cohort study including 93 girls with central precocious puberty, who were not treated with LHRH analogs and had reached their final adult height. The data was obtained from the clinical records. To predict height, the Bayley-Pinneau method and the Roche-Wainer- Thissen method were applied, and the results were compared with the genetic target height. The concordance between the estimated final height and the final height obtained was evaluated using the Bland-Altman method. Results: When comparing the final height obtained with that predicted by the Bayley-Pinneau method, there was a mean difference of 1.01 cm, and using the Rocke-Wainer-Thissen method, there was a difference of +0.96 cm. The calculation of the genetic target height showed a difference of +0.05 cm with respect to the final height. Conclusion: The prediction of height made by the Bayley-Pinneau and Roche-Wainer-Thissen methods was adequate and, contrary to expectations, it was similar to the calculation of the genetic target height that does not use the age of bone maturation. This also presented better concordance and less dispersion of the results with respect to the final height obtained.

Resumen: La pubertad precoz central consiste en una activación prematura del eje hipotálamo-hipófisis-gonadal, lo que produce una fusión temprana del cartílago de crecimiento y, en muchos casos, una talla inferior al objetivo genético. Un adecuado pronóstico de estatura final es fundamental para definir el tratamiento. Objetivo: Comparar la concordancia de la talla final utilizando la predicción de la esta tura efectuada por dos métodos validados versus la talla diana o talla objetivo genético, en niñas que consultaron por pubertad precoz central. Pacientes y Método: estudio retrospectivo de cohorte no concurrente en el que participaron 93 niñas con pubertad precoz central no tratadas con análogos de LHRH y que alcanzaron su talla final. Los datos iniciales se obtuvieron de sus fichas clínicas. Para pre decir la talla se aplicaron los métodos más utilizados en la práctica clínica, Bayley-Pinneau y Roche- Wainer-Thissen, y luego se compararon los resultados con la talla objetivo genético. La concordancia entre la talla final estimada y la talla final obtenida se evaluó mediante el método de Bland y Altman. Resultados: Al comparar la talla final obtenida con la predicha por el método de Bayley-Pinneau se observó una diferencia promedio de 1,01 cm. Mediante el método de Roche-Wainer-Thissen, se observó una diferencia de +0,96 cm. El cálculo de la talla objetivo genético, arrojó una diferencia de +0,05 cm respecto a la talla final. Conclusión: La predicción de estatura realizada por los métodos Bayley-Pinneau y Roche-Wainer-Thissen fue adecuada, y contrario a lo esperado, fue similar al cálcu lo de la talla objetivo genético que no utiliza la edad de maduración ósea. Esta además presentó mejor concordancia y menor dispersión de los resultados respecto a la talla final obtenida.

Abstract This paper tries to establish the philosophical roots of Don Quixote, using three different strategies. Firstly, looking for the names of relevant philosophers in Cervantes’ work (Socrates, Plato, Aristotle), with a rather null result. Secondly, bringing to light the abundant references to scholastic philosophy that appear in Cervantes’ work, related to epistemology, logic, metaphysics, rational theology, anthropology, ethics, politics and aesthetics. Thirdly, presenting the philosophical reference texts that Cervantes would surely possess in his personal library, based on Eisenberg’s work and dividing the influences on the philosophy of love, moral and political philosophy, popular philosophy or paremiology and miscellaneous.

Resumen El trabajo se propone establecer las raíces filosóficas del Quijote por medio de tres estrategias: en primer lugar, buscando el nombre de filósofos relevantes en la obra (Sócrates, Platón, Aristóteles); en segundo lugar, explicitando las referencias a la filosofía escolástica que aparecen en la obra, relativas a la epistemología, la lógica, la metafísica, la teología racional, la antropología, la ética, la política y la estética; por último, presentando los textos filosóficos de referencia que Cervantes poseería en su biblioteca personal, a partir del trabajo de Eisenberg, y dividiendo las influencias en filosofía del amor, filosofía moral y política, filosofía estética, filosofía popular o paremiología y misceláneas.

Resumen El uso excesivo del plástico, debido a sus excelentes propiedades y su bajo costo, ha llevado a la acumulación ubicua de residuos, ya que se biodegradan a muy largo plazo. Hasta ahora, varias investigaciones han desarrollado diferentes plásticos biodegradables y se siguen haciendo las pruebas para validarlos. En esta investigación, la prueba de biodegradabilidad se realizó sobre un bioplástico sintetizado a partir de xiloglucano de tamarindo y acrilato de etilo (b-XgT), diseñado como sustituto del poliestireno. Se sometió a compostaje una muestra del b-XgT en condiciones de laboratorio y se midió la liberación de CO2. Los resultados mostraron un tiempo de biodegradación de 18 días con una pérdida de masa de 40,3% y un pH final de 7,1. Se comprobó que el b-XgT es degradable de tipo compostable por vía anaeróbica, lo que favorece la digestión de compuestos como la xilosa que contribuyen a la degradación de todo el polímero.

Abstract Plastic is used excessively due to its excellent properties and its low cost. This has led to the ubiquitous accumulation of waste as it takes a very long time to biodegrade. Until now, several research projects have developed different biodegradable plastics, and the tests to validate them are still being undertaken. In this research, a biodegradability test was performed on a bioplastic synthesized from tamarind xyloglucan and ethyl acrylate (b-XgT), designed to be a substitute for polystyrene. A sample of the b-XgT was composted in laboratory conditions and CO2 release measurements were made. The results showed a biodegradation time of 18 days with a loss of mass of 40.3% and a final pH of 7.1. The b-XgT was found to be biodegradable of the compostable type through the anaerobic route, which promotes the digestion of compounds such as xylose that contribute to the degradation of the whole polymer.

Background: Hospitalization and deaths due to cardiovascular diseases (CVD), have a peak in frequency during winter. Aim: To assess the existence of seasonal variation in deaths due to acute myocardial infarction (AMI) in Chile. Material and Methods: Analysis of death report databases available at the website of the Chilean Ministry of Health. The seasonality of deaths due to AMI (codes ICD-10 I21, I22, I23) occuring in Chile between 2001-2016 were analyzed using a geometric model assuming a sinusoidal cyclic pattern. Results: During the period 2001-2016, a total of 94,788 deaths due to AMI were registered, corresponding to 93,349 corrected deaths. Of the latter, 29.2% occurred in winter, 24.9% in spring, 24.0% in autumn and 21.8% in summer. The geometric model showed a marked sinusoidal pattern for the aggregated data. The peak-to-low ratio of deaths was 1.41 (95% CI 1.38-1.44). The peak of deaths occurred during July in 14 out of 16 years analyzed. Conclusions: In Chile, deaths due to AMI have a marked seasonal pattern, characterized by a higher number of deaths in winter and a lower number in summer.

Abstract COVID-19 is a global public health issue due to its epidemic nature that, to date, lacks pharmacological treatment. However, some COVID-19 vaccines have been authorized for emergency use, although the duration of their protection, their ability to interrupt viral transmission, and their efficacy against emerging variants of SARS-CoV-2 are being studied. Chile's SARS-CoV-2 vaccination campaign required design and planning, like any other campaign. This process included the prioritization of risk groups for vaccination given the limited supply of COVID-19 vaccines globally. Throughout 2020, CAVEI issued recommendations on the prioritization of population groups to be vaccinated against SARS-CoV-2 in response to different needs and in accordance with available evidence. These recommendations are consolidated in Table 1 in this report. In summary, it was recommended that healthcare workers, people in long-term residences and essential State personnel be vaccinated in phase 1. In phase 2, persons over 65 years of age and people with comorbidities. In phase 3, essential tasks workers and, lastly, the general population.

Resumen El COVID-19 es un problema de salud pública mundial por su carácter epidémico que, a la fecha, carece de tratamiento farmacológico. Sin embargo, ya se cuenta con algunas vacunas autorizadas para uso en emergencia, aunque la duración de su protección, su capacidad para interrumpir la transmisión viral y su eficacia frente a variantes emergentes de SARS-CoV-2 se encuentran en estudio. La campaña de vacunación contra SARS-CoV-2 de Chile requirió de diseño y planificación, como toda campaña. Parte de estos fue la priorización de grupos objetivo de vacunar, necesaria debido a que el mundo se vería enfrentado a un suministro limitado de vacunas COVID-19. En distintos momentos del año 2020, el CAVEI emitió recomendaciones sobre priorización de grupos de población a vacunar contra SARS-CoV-2, respondiendo a diferentes necesidades y según la evidencia disponible en cada instancia. Éstas se consolidan en la Tabla 1 de este informe. Resumidamente, en fase 1 se recomendó vacunar al personal de salud, residencias de larga estadía y personal crítico del Estado. En fase 2, a personas mayores de 65 años y población con comorbilidades. En fase 3, a personas que cumplen labores esenciales y, finalmente, a la población general.

Abstract Background: The etiology of Kawasaki disease (KD) is unknown. It is believed that viral infections could trigger the disease in susceptible patients. Aim: To study the temporal association between the circulation of respiratory viruses and KD hospitalizations in the Metropolitan Region (MR), Chile, between 2010-2017. Methods: Ecologic study consisting of a review of KD cases in children under 18 years of age based on hospital discharges. The circulation of respiratory viruses was analyzed using the report of the metropolitan surveillance network. Moving averages for KD (MAKD) and respiratory viruses (MARV) were used. Results: 14,902 cases of respiratory virus infections were recorded between 2010-2017. A direct correlation was found between MARV-respiratory syncytial virus (RSV) of one month and year and MAKD of the subsequent month (correlation coefficient (ρ) = +0.441; p < 0.001). A similar association was found for MARV-influenza A (FLU A) (ρ = + 0.362; p < 0.001). MARV-influenza B (FLU B) and MARV-metapneumovirus (MPV) had direct correlations with MAKD (ρ = +0.443; p < 0.001 and ρ = +0.412; p < 0.001, respectively), being FLU B contemporary in month and year with KD, and MPV presenting a one-month lag. Conclusion: There is a direct temporal correlation between RSV, FLU A, FLU B and MPV circulation and KD in children from RM, Chile.

Resumen Introducción: La etiología de la enfermedad de Kawasaki (EK) es desconocida, planteándose que infecciones virales la gatillan en pacientes susceptibles. Objetivo: Estudiar la asociación temporal entre la circulación de virus respiratorios y hospitalizaciones por EK en la Región Metropolitana (RM), Chile, entre 2010-2017. Metodología: Estudio ecológico retrospectivo de casos de EK en pacientes bajo 18 años de edad, en base a egresos hospitalarios. La circulación de virus se analizó mediante el reporte de la red de vigilancia metropolitana. Se utilizaron promedios móviles para EK (PMEK) y virus respiratorios (PMVR). Resultados: Se registraron 14.902 casos de infecciones virales respiratorias entre 2010-2017. Se observó correlación directa entre PMVR-virus respiratorio sincicial (VRS) de un mes y año y PMEK del mes subsiguiente (coeficiente de correlación (ρ) = +0,441; p < 0,001), y una asociación similar para PMVR-influenza A (FLU A) (ρ = +0,362; p < 0,001). PMVR-influenza B (FLU B) y PMVR-metapneumovirus (MPV) presentan correlaciones directas con PMEK (ρ = +0,443; p < 0,001 y ρ = +0,412; p < 0,001, respectivamente), siendo contemporáneo en mes y año con EK para FLU B, mientras que MPV presenta un desfase de un mes entre PMVR y PMEK. Conclusión: Existe correlación temporal directa entre la circulación de VRS, FLU A, FLU B y MPV con EK en niños de la RM, Chile.

Abstract Background: Necrotizing enterocolitis (NEC) presents high mortality and postoperative, gastrointestinal and neurodevelopmental morbidity. There is limited information about NEC in Chile. Aim: To describe the clinical/epidemiological behavior of newborns who underwent NEC. Methods: Multicenter descriptive study of patients with NEC from seven hospitals of Santiago, Chile, during 2016. Descriptive statistics and univariate/multivariate analysis were performed (SPSS v22 software). Results: 75 cases were collected. Median days of life at diagnosis was 11, gestational age was 29 weeks, birth weight 1,114 g. The incidence was 2.6 per 1,000 live newborns and mortality was 18.6%, higher in ≤ 750 g, ≤ 25 weeks and surgical NEC. There was 45.3% microbiological isolation and 19 different empirical antibiotic schemes were used for the treatment of NEC. The multivariate analysis showed a higher risk of surgery in umbilical arterial catheter users, CRP > 10 mg/L and positive microbiological isolation. The highest risk of death was in umbilical arterial catheter users. Discussion: This ie the first multicenter study that collects local data information. The incidence was similar to that found in medical reports but with a lower mortality. There is no consensus of antibiotic treatment to use. With these results we hope to advance in improving the diagnosis and unify antimicrobial treatments, to reduce morbidity and mortality figures.

Resumen Introducción: Enterocolitis necrosante (ECN) representa una elevada mortalidad y morbilidad post-quirúrgica, gastrointestinal y del neuro-desarrollo. Existe limitada información en Chile. Objetivo: Describir el comportamiento clínico/epidemiológico de recién nacidos que cursaron con ECN. Pacientes y Métodos: Estudio multicéntrico descriptivo de pacientes con ECN de siete hospitales de Santiago, Chile, durante el 2016. Se realizó estadística descriptiva y análisis univariable/multivariable (software SPSS v22). Resultados: Se recolectaron 75 casos. Mediana de edad al diagnóstico fue 11 días, el promedio de edad gestacional 29 semanas y peso de nacimiento 1.285 g. La incidencia fue 2,6 por 1.000/recién nacidos vivos y letalidad de 18,6%, mayor en ≤ 750 g, ≤ 25 semanas y ECN quirúrgica. Hubo aislamiento microbiológico en 45,3% y se utilizaron 19 distintos esquemas antimicrobianos empíricos para el tratamiento de ECN. El análisis multivariable mostró tendencia a que la ECN fuese quirúrgica en usuarios de catéter umbilical arterial, PCR > 10 mg/L y aislamiento microbiológico, y hubo tendencia a fallecer en usuarios de catéter umbilical arterial. Discusión: Es el primer estudio multicéntrico que recopila información de datos locales. La incidencia fue similar a la descrita en la literatura médica, en cambio la letalidad fue algo menor. No existen consensos del tratamiento antimicrobiano a utilizar. Con estos resultados esperamos avanzar en mejorar el diagnóstico y unificar tratamientos antimicrobianos, para reducir cifras de morbimortalidad.

Abstract: Introduction: Hypoplastic left heart syndrome (HLHS) is the main cause of mortality due to congenital heart disea se. The Norwood surgery is the first procedure of the surgical staging process towards a single ventri cle physiology or Fontan-type operation and has a mortality rate of 10% to 30%. Extubation failure during the postoperative period occurs in up to 18% of these patients and is associated with increased mortality. Objective: To describe extubation failure rates and risk factors in pediatric patients with HLHS who underwent Norwood procedure. Patients and Method: Case-control study that included all the patients with HLHS managed with Norwood surgery at the Hospital Clínico de la Pontificia Universidad Catolica between January 2000 and February 2018. Cases and controls were defined as patients with extubation failure and as patients without this complication, respectively. The following variables were recorded demographic, surgical, and post-surgical ones, and univariate and multivariate analyses (logistic regression) were performed to determine risk factors associated with extubation failure. Results: Out of 107 patients, 26 of them presented extubation failure (24.3%). In the univariate analysis, longer mechanical ventilation time during the postsurgical period, atelectasis, pleural effusion, chylothorax, other respiratory morbidities (i.e. apneas and tracheitis), and longer infusion times of morphine and midazolam, all were associated with a higher extubation failure rate in this population. In the multivariable analysis, chylothorax, other respiratory comorbidities, and longer infusion time of midazolam remained associated with this complication, however, it was not associated with higher mortality. Conclusions: Chylothorax, respiratory comorbidities, and longer use of Midazolam should be addressed before planning airway extubation in order to avoid failure.

Resumen: Introducción: En pacientes con Síndrome de Hipoplasia de Ventrículo Izquierdo (SHVI) la primera etapa hacia una fisiología univentricular de Fontan es la operación de Norwood, cuya mortalidad es 10-30%. En estos pacientes la extubación fallida se presenta en un 18% y se ha asociado a aumento de la mortali dad. Objetivo: Describir la frecuencia de extubación fallida y sus factores de riesgo en pacientes con SHVI operados (Norwood). Pacientes y Método: Estudio de casos y controles que incluyó a todos los pacientes con SHVI manejados con cirugía de Norwood en el Hospital Clínico de la Pontificia Universidad Católica (enero-2000 a febrero-2018). Se define como casos a pacientes con falla en la extubación y como controles a los pacientes sin esta complicación. Se registraron variables demográficas, quirúrgicas, y post-quirúrgicas, y se realizó análisis univariado y multivariado (regresión logística) para determinar los factores de riesgo asociados a la falla en la extubación. Resultados: De un total de 107 pacientes, 26 pacientes tuvieron extubación fallida (24,3%). En el análisis univariado los factores asociados a extubación fallida fueron: mayor tiempo de ventilación mecánica postquirúrgico, desarrollar atelectasias, derrame pleural, quilotórax, tener otras comorbilidades respiratorias (apnea y traqueítis), y mayor tiempo de uso de morfina y midazolam. En el análisis multivariado, la presencia de quilotórax, otras comorbilidades respiratorias, y mayor tiempo de uso de midazolam fueron variables asociadas a extubación fallida (p<0,03). La extubación fallida no se asoció a mayor mortalidad. Conclusiones: La presencia de quilotórax, complicaciones respiratorias y uso de mida zolam prolongado deben considerarse para definir el momento de la extubación, con el objetivo de evitar su fracaso.

Abstract Background: Gallbladder cancer (GBC) is the most common tumor of the biliary tract. The incidence of GBC shows a large geographic variability, being particularly frequent in Native American populations. In Chile, GBC represents the second cause of cancer-related death among women. We describe here the establishment of three novel cell lines derived from the ascitic fluid of a Chilean GBC patient, who presented 46% European, 36% Mapuche, 12% Aymara and 6% African ancestry. Results: After immunocytochemical staining of the primary cell culture, we isolated and comprehensively characterized three independent clones (PUC-GBC1, PUC-GBC2 and PUC-GBC3) by short tandem repeat DNA profiling and RNA sequencing as well as karyotype, doubling time, chemosensitivity, in vitro migration capability and in vivo tumorigenicity assay. Primary culture cells showed high expression of CK7, CK19, CA 19-9, MUC1 and MUC16, and negative expression of mesothelial markers. The three isolated clones displayed an epithelial phenotype and an abnormal structure and number of chromosomes. RNA sequencing confirmed the increased expression of cytokeratin and mucin genes, and also of TP53 and ERBB2 with some differences among the three cells lines, and revealed a novel exonic mutation in NF1. The PUC-GBC3 clone was the most aggressive according to histopathological features and the tumorigenic capacity in NSG mice. Conclusions: The first cell lines established from a Chilean GBC patient represent a new model for studying GBC in patients of Native American descent.

Background: Passive surveillance systems for adverse events following immunization (AEFI) allow the monitoring of known adverse effects (AE) and the investigation of infrequent AE. Aim: To describe the AEFI notified in Chile between 2014 and 2016. Methodology: This was a study of epidemiological surveillance. A general analysis of AEFI and sub-analysis for pentavalent vaccine was carried out. It was calculated the global reporting rate of AEFI every 100,000 doses of vaccines, the reporting rate of AEFI considered of interest and the odds ratio of reporting (ROR) of apneas for pentavalent. Results: The total AEFI reported was 2,552 with a global reporting rate of 9,13. 13.4% of AEFI were serious. The vaccine reporting rate of events of interest was generally lower than the reference rates. The vaccine with the highest reporting rate (44.3) was pentavalent, with an ROR of apnea versus other vaccines of 10.5 (95% CI 3.77-29.47). Discussion: This study provides an overview of the AEFI notified in Chile. The global reporting rate was similar to other studies, but those of events of interest were lower than international references. A possible association between apnea and pentavalent vaccine is shown.

Resumen Introducción: Los sistemas de vigilancia pasiva de los eventos supuestamente atribuidos a vacunación o inmu nización (ESAVI) permiten monitorizar efectos adversos (EA) conocidos y pesquisar EA infrecuentes. El objetivo de este estudio fue describir los ESAVI notificados en Chile entre los años 2014 y 2016. Material y Método: Estudio de vigilancia epidemiológica. Se realizó un análisis general y un sub-análisis para vacuna pentavalente. Se calculó la tasa de reporte (TR) global de ESAVI cada 100.000 dosis de vacunas, la TR de ESAVI considerados de interés y el odds ratio de reporte (ROR) de apneas para pentavalente. Resultados: El total de ESAVI notificados fue de 2.552 con una TR global de 9,13. Un 13,4% de los ESAVI fueron serios. La TR de eventos de interés fue en general menor a las tasas de referencia. La vacuna con mayor TR (44,3) fue pentavalente, con un ROR de apnea versus otras vacunas de 10,5 (IC 95% 3,77-29,47). Discusión: Este estudio entrega una visión general de los ESAVI notificados en Chile. La TR global fue similar a otras reportadas, pero las de eventos de interés fueron menores a las referencias internacionales. Se muestra una posible asociación entre apneas y vacuna pentavalente.