Hyponatremia and malnutrition: a comprehensive review.

BACKGROUND: Hyponatremia (serum sodium lower than 135 mmol/L) is the most frequent electrolyte alteration diagnosed in medical practice. It has deleterious clinical effects, being an independent predictor of mortality. Malnutrition encompasses pathological states caused by both nutrients excess and deficiency, being frequently documented in chronic kidney disease patients. In addition, chronic hyponatremia promotes adiposity loss and sarcopenia, while malnutrition can induce hyponatremia. This pathological interaction is mediated by four main mechanisms: altered electrolyte body composition (low sodium, low potassium, low phosphorus, or high-water body content), systemic inflammation (cytokines increase), hormonal mechanisms (renin-angiotensin-aldosterone system activation, vasopressin release), and anorexia (primary or secondary). CONCLUSION: Malnutrition can induce hyponatremia through hydro-electrolytic, hormonal, inflammatory, or nutritional behavior changes; while hyponatremia per se can induce malnutrition, so there is a pathophysiological feedback between both conditions.

Non-Chinese herbal medicines for functional dyspepsia.

BACKGROUND: One-third of people with gastrointestinal disorders, including functional dyspepsia, use some form of complementary and alternative medicine, including herbal medicines. OBJECTIVES: The primary objective is to assess the effects of non-Chinese herbal medicines for the treatment of people with functional dyspepsia. SEARCH METHODS: We searched the following electronic databases on 22 December 2022: Cochrane Central Register of Controlled Trials, MEDLINE, Embase, Allied and Complementary Medicine Database, Latin American and Caribbean Health Sciences Literature, among other sources, without placing language restrictions. SELECTION CRITERIA: We included RCTs comparing non-Chinese herbal medicines versus placebo or other treatments in people with functional dyspepsia. DATA COLLECTION AND ANALYSIS: Two review authors independently screened references, extracted data and assessed the risk of bias from trial reports. We used a random-effects model to calculate risk ratios (RRs) and mean differences (MDs). We created effect direction plots when meta-analysis was not possible, following the reporting guideline for Synthesis without Meta-analysis (SWiM). We used GRADE to assess the certainty of the evidence (CoE) for all outcomes. MAIN RESULTS: We included 41 trials with 4477 participants that assessed 27 herbal medicines. This review evaluated global symptoms of functional dyspepsia, adverse events and quality of life; however, some studies did not report these outcomes. STW5 (Iberogast) may moderately improve global symptoms of dyspepsia compared with placebo at 28 to 56 days; however, the evidence is very uncertain (MD -2.64, 95% CI -4.39 to -0.90; I2 = 87%; 5 studies, 814 participants; very low CoE). STW5 may also increase the improvement rate compared to placebo at four to eight weeks' follow-up (RR 1.55, 95% CI 0.98 to 2.47; 2 studies, 324 participants; low CoE). There was little to no difference in adverse events for STW5 compared to placebo (RR 0.92, 95% CI 0.52 to 1.64; I2 = 0%; 4 studies, 786 participants; low CoE). STW5 may cause little to no difference in quality of life compared to placebo (no numerical data available, low CoE). Peppermint and caraway oil probably result in a large improvement in global symptoms of dyspepsia compared to placebo at four weeks (SMD -0.87, 95% CI -1.15 to -0.58; I2 = 0%; 2 studies, 210 participants; moderate CoE) and increase the improvement rate of global symptoms of dyspepsia (RR 1.53, 95% CI 1.30 to 1.81; I2 = 0%; 3 studies, 305 participants; moderate CoE). There may be little to no difference in the rate of adverse events between this intervention and placebo (RR 1.56, 95% CI 0.69 to 3.53; I2 = 47%; 3 studies, 305 participants; low CoE). The intervention probably improves the quality of life (measured on the Nepean Dyspepsia Index) (MD -131.40, 95% CI -193.76 to -69.04; 1 study, 99 participants; moderate CoE). Curcuma longa probably results in a moderate improvement global symptoms of dyspepsia compared to placebo at four weeks (MD -3.33, 95% CI -5.84 to -0.81; I2 = 50%; 2 studies, 110 participants; moderate CoE) and may increase the improvement rate (RR 1.50, 95% CI 1.06 to 2.11; 1 study, 76 participants; low CoE). There is probably little to no difference in the rate of adverse events between this intervention and placebo (RR 1.26, 95% CI 0.51 to 3.08; 1 study, 89 participants; moderate CoE). The intervention probably improves the quality of life, measured on the EQ-5D (MD 0.05, 95% CI 0.01 to 0.09; 1 study, 89 participants; moderate CoE). We found evidence that the following herbal medicines may improve symptoms of dyspepsia compared to placebo: Lafonesia pacari (RR 1.52, 95% CI 1.08 to 2.14; 1 study, 97 participants; moderate CoE), Nigella sativa (SMD -1.59, 95% CI -2.13 to -1.05; 1 study, 70 participants; high CoE), artichoke (SMD -0.34, 95% CI -0.59 to -0.09; 1 study, 244 participants; low CoE), Boensenbergia rotunda (SMD -2.22, 95% CI -2.62 to -1.83; 1 study, 160 participants; low CoE), Pistacia lenticus (SMD -0.33, 95% CI -0.66 to -0.01; 1 study, 148 participants; low CoE), Enteroplant (SMD -1.09, 95% CI -1.40 to -0.77; 1 study, 198 participants; low CoE), Ferula asafoetida (SMD -1.51, 95% CI -2.20 to -0.83; 1 study, 43 participants; low CoE), ginger and artichoke (RR 1.64, 95% CI 1.27 to 2.13; 1 study, 126 participants; low CoE), Glycyrrhiza glaba (SMD -1.86, 95% CI -2.54 to -1.19; 1 study, 50 participants; moderate CoE), OLNP-06 (RR 3.80, 95% CI 1.70 to 8.51; 1 study, 48 participants; low CoE), red pepper (SMD -1.07, 95% CI -1.89 to -0.26; 1 study, 27 participants; low CoE), Cuadrania tricuspidata (SMD -1.19, 95% CI -1.66 to -0.72; 1 study, 83 participants; low CoE), jollab (SMD -1.22, 95% CI -1.59 to -0.85; 1 study, 133 participants; low CoE), Pimpinella anisum (SMD -2.30, 95% CI -2.79 to -1.80; 1 study, 107 participants; low CoE). The following may provide little to no difference compared to placebo: Mentha pulegium (SMD -0.38, 95% CI -0.78 to 0.02; 1 study, 100 participants; moderate CoE) and cinnamon oil (SMD 0.38, 95% CI -0.17 to 0.94; 1 study, 51 participants; low CoE); moreover, Mentha longifolia may increase dyspeptic symptoms (SMD 0.46, 95% CI 0.04 to 0.88; 1 study, 88 participants; low CoE). Almost all the studies reported little to no difference in the rate of adverse events compared to placebo except for red pepper, which may result in a higher risk of adverse events compared to placebo (RR 4.31, 95% CI 1.56 to 11.89; 1 study, 27 participants; low CoE). With respect to the quality of life, most studies did not report this outcome. When compared to other interventions, essential oils may improve global symptoms of dyspepsia compared to omeprazole. Peppermint oil/caraway oil, STW5, Nigella sativa and Curcuma longa may provide little to no benefit compared to other treatments. AUTHORS' CONCLUSIONS: Based on moderate to very low-certainty evidence, we identified some herbal medicines that may be effective in improving symptoms of dyspepsia. Moreover, these interventions may not be associated with important adverse events. More high-quality trials are needed on herbal medicines, especially including participants with common gastrointestinal comorbidities.

Adapting medical education to the COVID-19 pandemic: the experience of 1520 students / [Adaptación de la educación médica a la pandemia COVID-19: la experiencia de 1520 alumnos]

Introduction: Due to the measures imposed by the argentine government during the SARS-CoV-2 pandemic, the capacity of universities and hospitals for the development of face-to-face educational activities has been restricted. Therefore, we set out to explore the perceptions of the educational impact and the experience in the virtual environment of Argentine medical students. Methods: We carried out an observational, analytical, cross-sectional study. The data collection was carried out through a national questionnaire in the period between April 19 and June 15, 2020 through a "snowball" type sampling. Results: The study population involved medical students from Argentina (n = 1520 students). From which we observed that 95.41% (n = 1505) believed that their formation was affected, only 56.14% (n = 850) of the universities were able to virtualize all the subjects, and 97.69% (n = 1479) believed that argentine universities were not fully prepared. As for their experience in virtuality; 92.98% (n = 1364) reported that virtual education allowed them to advance in their career, 76.89% (n = 1128) indicated that the quality of the virtual classes got worse compared to the face-to-face ones, and 58.55% (n = 859) did not have the possibility to take an exam virtually. Conclusion: Consequently, we concluded that the COVID-19 pandemic exposed the need to prepare medical careers for the management of educational contingencies. The results of this research reflect a student population affected in their learning by this situation. Educational policies that take into account the needs expressed by students are crucial.

Introducción: Debido al aislamiento impuesto por el gobierno durante la pandemia por SARS-CoV-2, se restringió la presencialidad en actividades educativas de universidades y hospitales. Objetivo: Nos propusimos explorar el efecto de la pandemia sobre el sistema educativo y la experiencia en el entorno virtual de los estudiantes de medicina de Argentina. Métodos: Llevando a cabo un estudio observacional, analítico, de tipo corte transversal. La recolección de  datos se realizó mediante un cuestionario nacional en el período comprendido entre el 19 de abril y el 15 de junio del 2020 a través de un muestreo tipo "bola de nieve". La población en estudio involucró a estudiantes de medicina de la República Argentina (n=1520 estudiantes). Resultados: Observamos que el 95.41% (n=1505) señaló que su formación se vio afectada, tan solo el 56.14% (n=850) de las universidades pudo virtualizar todas las asignaturas, y el 97.69% (n=1479) expresó que las universidades argentinas no estaban completamente preparadas. En cuanto a la experiencia en virtualidad; el 92.98% (n=1364) comunicó que la educación virtual le permitió avanzar en la carrera, el 76.89% (n=1128) indicó que la calidad de las clases virtuales fue peor que las presenciales, y el 58.55% (n=859) no tuvo posibilidad de rendir algún examen de manera virtual. Conclusión: Concluimos que la pandemia expone la necesidad de preparar a las carreras de medicina para el manejo de las contingencias educativas. Los resultados reflejan una población estudiantil afectada en sus aprendizajes por esta situación coyuntural. Políticas educativas que tomen en cuenta las necesidades expuestas por los estudiantes resultan cruciales.

Análisis de causas de muerte intrahospitalarias mal definidas e imprecisas / Analysis of ill-defined and imprecise in-hospital causes of death

Introducción: la información sobre las causas de muerte es de gran importancia tanto para los países como para las instituciones sanitarias, en la medida en que contribuye a la evaluación y el seguimiento del estado de salud de la población y a la planificación de intervenciones sanitarias. El objetivo del estudio fue evaluar la proporción de causas de muerte mal definidas e imprecisas y su relación con el día de la semana y período lectivo de médicos residentes en el Hospital Italiano de Buenos Aires (HIBA) durante 2020. Métodos: se realizó un estudio analítico de corte transversal a partir de certificados médicos de defunción de pacientes fallecidos en el ámbito intrahospitalario, evaluando las causas de muerte mal definidas (términos médicos que no aportan información desde el punto de vista clínico y epidemiológico) y las imprecisas (no resultan lo suficientemente específicas como para identificar entidades nosológicas que permitan establecer acciones de prevención y control). Resultados: se analizaron 1030 certificados de defunción, con una proporción de certificados con causa básica de muerte mal definida del 2,3% (n = 24), mientras que en el 17,4% (n = 180) fue imprecisa. No se hallaron diferencias entre la proporción de causas básicas mal definidas y las imprecisas según el día de la semana o período lectivo. Al extender el análisis a todas las causas (básicas, mediatas e inmediatas), la proporción de causas mal definidas fue del 1,6% (n = 40) y la de imprecisas del 51% (n = 1212). Conclusiones: los resultados definen al HIBA como un centro de mediana calidad estadística en el registro de causas de muerte. Se concluye que es necesario mejorarla, para lo que resulta de interés la creación de un plan de capacitación y entrenamiento de los médicos en el grado y el posgrado. (AU)

Introduction: information on causes of death is of great importance both for countries and for health institutions, as it contributes to the evaluation and monitoring of the health status of the population and to the planning of health interventions. The purpose of this study was to evaluate the proportion of ill-defined and imprecise causes of death and its relationship with the day of the week and academic calendar during 2020 at the Hospital Italiano de Buenos Aires. Methods: a cross-sectional study was carried out from data recorded in the death certificates of patients who died in the intrahospital setting, evaluating ill-defined causes of death (medical terms that do not provide clinical or epidemiological information) and imprecise ones (not specific enough to identify nosological entities susceptible to prevention or control). Results: 1030 death certificates were analyzed. The proportion of certificates with ill-defined underlying causes of death was 2.3% (n=24), while 17.4% (n=180) was imprecise. No significant differences were found between the ill-defined and imprecise underlying causes of death and the day of the week and academic calendar. When extending the analysis to all causes (underlying, intermediate, and immediate) the percentage of ill-defined causes was 1.6% (n=40) and 51% (n=1212) was imprecise. Conclusions: results define our hospital as of medium statistical quality on medical death certification. It is concluded that it is necessary to improve the quality of the registry, for which the creation of a training plan for undergraduate and graduate physicians is of interest. (AU)

A qualitative study on the elderly and mental health during the COVID-19 lockdown in Buenos Aires, Argentina - Part 1. / Estudio cualitativo sobre los adultos mayores y la salud mental durante el confinamiento por COVID-19 en Buenos Aires, Argentina - parte 1.

INTRODUCTION: On March 19, 2020, preventive and mandatory social isolation was decreed in Argentina in response to the pandemic caused by the SARS-CoV-2 virus and the disease it causes (COVID-19). This measure aimed to reduce the transmission of the virus and the resulting severe respira-tory condition that frequently besets older adults. However, this measure can also affect the support networks of these isolated people. OBJECTIVES: To explore the emerging needs related to the mental health of isolated older adults in this period and to identify the main support networks they have and the emerging coping strategies in the face of the situation. METHODOLOGY: We carried out an exploratory qualitative study, summoning participants over 60 years of age. Using snowball sampling, a group of researchers contacted them by phone to collect data. The analysis of the findings was triangulated among researchers with different academic backgrounds (medicine, psychology, and sociology). The concepts emerging from the interviews were linked in conceptual networks using an inductive methodology and were mapped into conceptual frameworks available to researchers. Atlas.ti 8 software was used for coding. RESULTS: Thirty-nine participants belonging to the Buenos Aires Metropolitan Area were interviewed between April and July 2020. For greater clarity, the main themes were described in five cross-sectional axes: network configurations, resources and coping strategies, affective states and emo-tions, perceptions and reflections on the future, and actions emerging from the participatory approach. Participants reported distress, anxiety, anger, uncertainty, exhaustion, and expressed fear of contagion from themselves and their loved ones. We identify greater vulnerability in people living alone, in small and closed environments, with weak linkages and networks, or limited access to technologies. We also found vari-ous coping strategies and technology was a fundamental factor in maintaining the bonds. CONCLUSIONS: The findings of this research have implications for decision-making at the individual level, health systems, professional care, and policy devel-opment. Future research may elucidate the regional, temporal, and socioeconomic variations of the phenomena explored in our research.

INTRODUCCIÓN: El 19 marzo de 2020 se decretó el aislamiento social preventivo y obligatorio en Argentina como respuesta a la pandemia por el virus SARS-CoV-2 y la enfermedad que causa (COVID-19). Esta medida tiene por objetivo disminuir la transmisión del virus que puede generar un cuadro respiratorio severo, más frecuentemente en adultos mayores. Sin embargo, esta medida puede afectar sus redes de contención por encontrarse previamente aislados. OBJETIVOS: Explorar las necesidades emergentes relacionadas a la salud mental de adultos mayores aislados en este periodo, e identificar las principales redes de contención con que estos cuentan, como así también las estrategias de afrontamiento emergentes frente a la situación. METODOLOGÍA: Se realizó un estudio cualitativo exploratorio convocando a participantes mayores de 60 años de edad. Mediante un muestreo en bola de nieve, un grupo de investigadores los contactó por teléfono para la recolección de datos. Se trianguló el análisis de los hallazgos entre los investigado-res con distinta formación académica (medicina, psicología y sociología). Los conceptos emergentes de las entrevistas fueron vinculados en redes conceptuales utilizando una metodología inductiva, y mapeando en marcos conceptuales disponibles para los investigadores. Para la codi-ficación se usó el software Atlas.ti 8. RESULTADOS: Se entrevistaron a 39 participantes pertenecientes al área metropolitana de Buenos Aires durante los meses de abril y julio de 2020. Para una presentación más clara, los principales temas fueron descritos en cinco ejes transversales: configuraciones vinculares; recursos y estrategias de afrontamiento; estados afectivos y emociones; percepciones y reflexiones sobre el futuro; y acciones emergentes del enfoque participativo. Los participantes del estudio relataron angustia, ansiedad, enojo, incertidumbre, hartazgo y expresaron el temor al contagio de sí mismos y de sus seres queridos. Se identificaron personas en situación de mayor vulnerabilidad al vivir solas, en ambientes pequeños y cerrados, con redes vinculares frágiles o con limitado manejo de las tecnologías. También encontramos estrategias de afrontamiento variadas para atravesar la situación y la tecnología fue un actor fundamental en el mantenimiento de los vínculos. CONCLUSIONES: Los hallazgos de esta investigación tienen implicancias en la toma de decisiones a nivel individual, de los sistemas de salud, atención profesional y el desarrollo de políticas. Futuras investigaciones pueden dilucidar las variaciones regionales, temporales y socioeconómicas de los fenómenos explorados en nuestra investigación.

A qualitative study on the elderly and accessibility to health services during the COVID-19 lockdown in Buenos Aires, Argentina - Part 2. / Estudio cualitativo sobre los adultos mayores y la accesibilidad a los servicios de salud durante el confinamiento por COVID-19 en Buenos Aires, Argentina - parte 2.

INTRODUCTION: On March 19, 2020, a mandatory lockdown was imposed in Argentina due to the global pandemic caused by SARS-CoV-2. OBJECTIVES: To explore the elderlys healthcare experiences during the lockdown and the problems that may have arisen regarding accessibility to the healthcare system and emerging adaptations to medical care. METHODS: We coded the data using Atlas.ti 8 software and then triangled the analysis among researchers from different backgrounds. Finally, concept maps were developed and themes arising from these were described. RESULTS: Thirty-nine participants were interviewed from the metropolitan area in Buenos Aires from April to July of 2020. The main emerging themes were: 1) access to regularly scheduled consults, 2) access to chronic medication, 3) emergency consultations, and 4) the role of information and communication technologies. Accessibility to the healthcare system was compromised due to reduced outpatient consultations, affecting health checkups, diagnosis, and treatment. However, participants tried to keep their immunizations up to date. Information and communication technologies were used to fill digital prescriptions and online medical consultations. While this was a solution to many, others did not have access to these technologies or had trouble using them. CONCLUSIONS: The global pandemic caused a reduction in outpatient medical consultations. Emerging needs originated new ways of carrying out medical consultations, mainly through information and communication technologies, which was a solution for many but led to the exclusion of others because of the preexisting technology gap.

INTRODUCCIÓN: El 19 marzo de 2020 se decretó el aislamiento social preventivo y obligatorio en Argentina como respuesta a la pandemia por el virus SARS-CoV-2 y la enfermedad que causa, COVID-19. OBJETIVOS: Explorar las experiencias de los adultos mayores con relación al cuidado de su salud durante el confinamiento por COVID-19, los problemas en la accesibilidad al sistema de salud y las adaptaciones emergentes. MÉTODOS: Investigación con abordaje cualitativo. Los participantes fueron adultos mayores de 60 años. Mediante un muestreo en bola de nieve, el equipo investigador contactó telefónicamente a los participantes donde se realizó una entrevista semiestructurada. Se trianguló el análisis de los hallazgos entre los investigadores con distinta formación académica. Se realizaron mapas conceptuales a través de los cuales se eligieron los ejes temáticos a abordar. RESULTADOS: Se entrevistaron a 39 participantes de la Ciudad Autónoma de Buenos Aires y Gran Buenos Aires en el período de abril y julio del año 2020. Los principales temas emergentes fueron: acceso a consultas programadas habituales, acceso a la medicación crónica, consultas agudas y emergentes, y el rol de las tecnologías de información y comunicación. La accesibilidad al sistema de salud se vio comprometida por la disminución de oferta de consultas presenciales, afectando los controles de salud, el diagnóstico y tratamiento de enfermedades. Sin embargo, los participantes intentaron mantener al día sus inmunizaciones. Las tecnologías de la información y comunicación permitieron la emisión de recetas virtuales y las teleconsultas. Si bien esto representó una solución para muchos adultos mayores, también generó un problema para otros que no tenían acceso o no sabían utilizarlas. CONCLUSIÓN: La pandemia afectó la accesibilidad al sistema de salud, principalmente a expensas de un menor acceso a consultas de modalidad presencial. Las necesidades emergentes forzaron la aparición de nuevas estrategias de atención, como las tecnologías de información y comunicación. Esto, si bien significó una solución, también generó nuevos excluidos debido a la brecha tecnológica preexistente.

Métodos de rastreo del cáncer de colon / Colon cancer screening methods

El cáncer colorrectal presenta un problema para la salud pública a nivel mundial. En Argentina, se diagnostican aproximadamente 13.500 casos cada año. El tamizaje como medida de prevención secundaria es una medida beneficiosa para lograr un abordaje temprano con mejores resultados. Los dos métodos más utilizados para el tamizaje son la videocolonoscopía y la prueba de sangre oculta en materia fecal, sobre todo la de tipo inmunoquímico que con el paso de los años fue reemplazando a la prueba de guayaco por su mayor practicidad. El primero es un método invasivo y que requiere anestesia, mientras que el segundo no tiene un efecto adverso directo pero debe realizarse con una cadencia mayor. El objetivo de los autores de este artículo fue evaluar la evidencia sobre la sensibilidad y especificidad de ambos métodos, como también sus beneficios y daños a partir de la consulta de un paciente a su médico de familia. Ninguna prueba parecería ser inferior para el tamizaje de cáncer colorrectal en una población de riesgo promedio, y ambas pueden usarse en programas de rastreo. Sin embargo, no existen estudios que comparen ambos métodos de manera directa, y toda prueba inmunoquímica fecal positiva debe ser seguida de una colonoscopía. La elección de la prueba puede depender de los valores y preferencias de los pacientes. (AU)

Colorectal cancer presents a public health problem worldwide. In Argentina, approximately 13,500 cases appear each year. Screening as a secondary prevention measure is a beneficial measure to achieve an early approach with better results. The two most used methods for screening are video colonoscopy and faecal immunochemical test, the former being invasiveand requiring anaesthesia, while the latter does not have a direct adverse effect but must be performed at a higher rate. The objective of this article was to evaluate the evidence for the sensitivity and specificity of both methods, as well as their benefits and harms. No test would appear to be inferior for colorectal cancer screening in an average-risk population, and both can be used in screening programs. However, there are no studies comparing both methods directly, and any positive faecal immunochemical test should be evaluated with a colonoscopy. The choice of the test may depend on the values and preferences of the patients. (AU)

Métodos diagnósticos para la infección por SARS-CoV-2 / Diagnostic methods for SARS-CoV-2 infection

En diciembre de 2019 se identificó el virus SARS-CoV-2, cuya rápida propagación global puso en estado de emergencia al mundo entero, llevando al ser humano a una situación sin antecedente cercano. El objetivo de esta revisión es describir los métodos diagnósticos utilizados actualmente para identificar la infección por SARS-CoV-2. Las manifestaciones clínicas y el espectro imagenológico de la enfermedad son muy inespecíficos y no permiten realizar un diagnóstico certero. Por esta razón, es esencial una apropiada toma de muestra respiratoria en el momento y sitio anatómico adecuado para un diagnóstico preciso de COVID-19. La técnica de muestreo más utilizada es el hisopado nasofaríngeo y la prueba diagnóstica más fiable se basa en la retrotranscripción seguida por reacción en cadena de la polimerasa en tiempo real (RT-PCR). No obstante, existen otras técnicas moleculares, como también tests serológicos para detectar anticuerpos o fragmentos antigénicos del SARS-CoV-2. Más allá de la precisión diagnóstica, es importante tener en cuenta la probabilidad basal (pretest) para interpretar correctamente el resultado obtenido y aislar aquellos posibles falsos negativos. Con el objetivo de evitar la saturación del sistema de salud es imprescindible contar con información y métodos diagnósticos precisos para detectar tempranamente los focos de infección y reducir la transmisión comunitaria, utilizando eficazmente los diferentes recursos diagnósticos. (AU)

In December 2019, the SARS-CoV-2 virus was identified for the first time, whose rapid global spread put the entire world in a state of emergency, leading humans to an unprecedented situation with no immediate history. The main purpose of this review is to describe the diagnostic methods currently used to identify SARS-CoV-2 infection. The clinical manifestations and the imaging spectrum of the disease are nonspecific and do not allow an accurate diagnosis to be made. For this reason, an appropriate respiratory sampling at the right time and anatomical site is essential for an accurate diagnosis of COVID-19. The most widely used sampling technique is nasopharyngeal swab, and the most reliable diagnostic test is by reverse transcription followed by real-time polymerase chain reaction (RT-PCR). However, there are other molecular techniques, as well as serological tests to detect antibodies or antigenic fragments of SARS-CoV-2. Beyond the diagnostic precision, it is important to take into account the baseline probability (pre-test) to correctly interpret the result obtained and isolate those possible false negatives. In order to avoid saturation of the health system, it is essential to have accurate information and diagnostic methods to detect outbreaks of infection in early stages and to reduce communitary transmission, making effective use of the various diagnostic resources. Coronavirus infections/diagnosis, viral/diagnosis, pandemics, clinical laboratory techniques, real-time polymerase chain reaction, antigens, viral/analysis. (AU)

Recomendación rápida sobre el uso de antihipertensivos IECA/ARA II en pacientes con riesgo o documentación de COVID-19 / Rapid recommendation on the use of ACEI/ARA antihypertensives in patients at risk or with documented COVID-19

Ciertos hallazgos preclínicos generaron preocupación en la comunidad científica y en la población general sobre el uso de inhibidores de la enzima convertidora de angiotensina (IECA) y los antagonistas del receptor de la angiotensina II (ARAII), y los posibles desenlaces adversos asociados con relación a la infección por el nuevo Coronavirus (SARS-Cov-2).Por este motivo, nos planteamos como objetivo proveer de recomendaciones dinámicas (living recommendations) para el tratamiento con fármacos IECA o ARA II en pacientes con riesgo o documentación de infección por SARS-CoV-2 (en todo su espectro de gravedad). Se utilizó como metodología la adaptación/adopción de guías de práctica clínica bajo el enfoque GRADE, actualizando la evidencia al 7 de abril de 2020 mediante búsquedas en múltiples bases de datos y consultando a un panel multidisciplinario libre de conflictos de interés. Como resultado de este proceso se arribó a la siguiente afirmación: se recomienda, en contexto de la pandemia de COVID-19, en personas que se encuentran en tratamiento con IECA/ARAII, mantener el tratamiento sin cambios por sobre suspenderlo o reemplazarlo por otros fármacos (Recomendación fuerte a favor - calidad de evidencia baja). (AU)

Certain preclinical findings raised concerns in the scientific community and in the general population about the use ofangiotensin-converting enzyme inhibitors (ACEI) and angiotensin II receptor antagonists (ARA) and the possible adverse outcomes associated with the infection with the new Coronavirus (SARS-Cov-2). For this reason, our objective is to provide living recommendations for treatment with ACEI or ARA in patients with risk or documentation of SARS-CoV-2 infection (inall its severity spectrum). The adaptation/adoption of clinical practice guidelines under the GRADE approach was used as a methodology, updating the evidence as of April 7, 2020, by searching multiple databases and consulting a multidisciplinary panel free of conflicts of interest. As a result of this process, the following statement was reached: it is recommended, in the context of the COVID-19 pandemic, in people who are undergoing treatment with ACEI/ARA, to maintain the treatment unchanged instead of its suspension or replacement with other drugs (Strong recommendation in favor - low quality ofevidence). (AU)

Physicochemical Characterization of a Heat Treated Calcium Alginate Dry Film Prepared with Chicken Stock.

Solid sodium alginate was dissolved into chicken stock in order to give a final alginate concentration of 0.9 percent (w/v). Calcium ions present in chicken stock were enough to induce ionic gelation. After drying, Fourier transform infrared spectroscopy, thickness and mechanical properties of films obtained were determined. Calcium alginate-chicken stock films were heated at 130 °C for different times between 0 and 15 min. Mechanical and optical studies, differential scanning calorimetry, visual aspect and scanning electron microscopy were carried out to describe physicochemical properties of heat treated films. Heating developed a maroon ochre color and increased the brittleness (crispness) of the films related to the intensity of the treatment. Differential scanning thermometry and study on appearance of the films suggested that Maillard reactions may be responsible for the observed changes. Maillard reactions mainly occurred between reducing sugar monomers and free amino groups of gelatin peptides present in the chicken stock, and between alginate and gelatin peptides to a lesser extent. In addition, the plasticizing effect of fat added with chicken stock was also studied. These studies suggest a potential use of heat treated chicken stock films as a substitute of roasted chicken skin.