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How does the brain simultaneously process signals that bring complementary information, like raw sensory signals and their transformed counterparts, without any disruptive interference? Contemporary research underscores the brain's adeptness in using decorrelated responses to reduce such interference. Both neurophysiological findings and artificial neural networks support the notion of orthogonal representation for signal differentiation and parallel processing. Yet, where, and how raw sensory signals are transformed into more abstract representations remains unclear. Using a temporal pattern discrimination task in trained monkeys, we revealed that the second somatosensory cortex (S2) efficiently segregates faithful and transformed neural responses into orthogonal subspaces. Importantly, S2 population encoding for transformed signals, but not for faithful ones, disappeared during a nondemanding version of this task, which suggests that signal transformation and their decoding from downstream areas are only active on-demand. A mechanistic computation model points to gain modulation as a possible biological mechanism for the observed context-dependent computation. Furthermore, individual neural activities that underlie the orthogonal population representations exhibited a continuum of responses, with no well-determined clusters. These findings advocate that the brain, while employing a continuum of heterogeneous neural responses, splits population signals into orthogonal subspaces in a context-dependent fashion to enhance robustness, performance, and improve coding efficiency.

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INTRODUCCIÓN: En la diarrea asociada a Clostridioides dfficile (DACD) leve-moderada se recomienda tratar con vancomicina por sobre metronidazol, a pesar de su difícil acceso y poca evidencia en el medio ambulatorio. OBJETIVO: Comparar la tasa de cura clínica y recurrencia entre vancomicina y metronidazol en adultos chilenos con primer episodio leve-moderado de DACD de manejo ambulatorio. MÉTODOS: Cohorte retrospectiva entre enero 2015 y diciembre 2020 en centros de una red de salud universitaria de pacientes de ≥ 18 años con DACD tratados ambulatoriamente. RESULTADOS: Se obtuvieron 161 pacientes, 59% mujeres, edad promedio de 53 años (entre 18 y 94 años). De ellos, 109 (67,7%) usaron metronidazol y 52 (32,3%) vancomicina. En el análisis multivariado ajustado por edad y comorbilidades se obtuvo un OR 3,00 (IC 95% 1,12-9,59) para cura clínica y 0,27 (IC 95% 0,06-0,88) para recurrencia a ocho semanas, ambos a favor de vancomicina, sin diferencias en recurrencia a 12 meses, necesidad de hospitalización o mortalidad. CONCLUSIÓN: La terapia con vancomicina comparada contra metronidazol en el tratamiento ambulatorio de la infección leve-moderada por C. dfficile se asocia a mayor cura clínica y menor tasa de recurrencia a corto plazo, sin diferencias en desenlaces a largo plazo.

BACKGROUND: Recommended treatment against mild cases of Clostridioides difficile associated diarrhea is vancomycin despite the difficulties of access compared to metronidazole. AIM: To compare the effectiveness of vancomycin and metronidazole in Chilean adults with first mild-moderate episode of Clostridiodes difficile infection (CDI). METHODS: Retrospective cohort of patients with CDI between January 2015 and December 2020 treated in centers of a university health network. The patients were adults treated for C. difficile infection on an outpatient basis. Recurrent and severe cases were excluded. Outcomes included clinical cure and recurrence rate. RESULTS: Data from 161 patients was recovered. Fifty-nine percent were women and average age was 53 (18-94). One hundred and nine patients were treated with metronidazole (67.7%) and 52 (32.3%) used vancomycin. Multivariate analysis adjusted by age and comorbidities showed an Odds Ratio of 3.00 (IC 95% 1.12-9.59) for clinical cure and 0.27 (IC 95% 0.06-0.88) for 8-week recurrence rate, both in favor of vancomycin, without differences in 12-month recurrence rate, hospitalization rate nor mortality. CONCLUSIONS: Vancomycin is associated with better short-term outcomes in the treatment of outpatient mild-moderate first episode C. difficile infection, without differences in long term recurrence or mortality when compared with metronidazole.

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Objetivo: Mostrar las características y seguimiento de la dilatación del tracto urinario en recién nacidos con infección del tracto urinario. Métodos: Estudio observacional, descriptivo, realizado desde 1992 hasta 2019, en neonatos ingresados con infección del tracto urinario. A todos se les realizó ultrasonido renal y uretrocistografía miccional. Se analizaron las características clínicas y de radioimagen de presentación en el seguimiento de la dilatación del tracto urinario. Resultados: Se estudiaron 403 pacientes. La mediana de seguimiento fue de 13 meses. El ultrasonido renal resultó positivo para dilatación del tracto urinario en 148 (36,7 por ciento). Predominaron los grados de dilatación ligera (5-10 mm.) sobre grados moderados y severos. En 38 casos (9,4 por ciento) la dilatación del tracto urinario se asoció a reflujo vésico-ureteral. La condición más común fue la dilatación transitoria con una mediana de desaparición de la dilatación 5 meses. Hubo asociación estadística significativa de la desaparición de la dilatación del tracto urinario con el grado de esta y entre aquellos casos calificados de transitoria con los otros portadores de alguna anomalía del tracto urinario que también tuvieron desaparición de la dilatación en algún momento de su evolución. Conclusiones: Cerca de una tercera parte de los neonatos con infección del tracto urinario tuvieron dilatación del tracto urinario en ultrasonido renal, con predominio de grado ligero, como probable expresión de una anomalía del tracto urinario subyacente. Con frecuencia ocurre resolución de la dilatación del tracto urinario en aquellos casos no asociados con anomalía del tracto urinario, habitualmente dentro del primer año de vida(AU)

OBjective: To show the characteristics and follow-up of urinary tract dilatation in neonates with urinary tract infection. Methods: Observational, descriptive study performed from 1992 to 2019, in neonates admitted with urinary tract infection. All underwent renal ultrasound and voiding urethrocystography. The clinical and radioimaging features of presentation were analyzed in the follow-up of urinary tract dilatation, Results: 403 patients were studied. The median follow-up was 13 months. Renal ultrasound was positive for urinary tract dilatation in 148 (36.7 percent). Mild degrees of dilatation (5-10 mm) predominated over moderate and severe degrees. In 38 cases (9.4 percent) urinary tract dilatation was associated with vesico-ureteral reflux. The most common condition was transient dilatation with a median disappearance of dilatation 5 months. There was significant statistical association of the disappearance of urinary tract dilatation with the degree of dilatation and between those cases qualified as transient with the other carriers of some urinary tract anomaly who also had disappearance of dilatation at some point in their evolution. Conclusions: About one third of neonates with urinary tract infection had dilatation of the urinary tract on renal ultrasound, predominantly of mild degree, probably expression of an underlying anomaly. Resolution of dilatation frequently occurs in those cases not associated with urinary tract anomaly, usually within the first year of life(AU)

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Do sensory cortices process more than one sensory modality? To answer these questions, scientists have generated a wide variety of studies at distinct space-time scales in different animal models, and often shown contradictory conclusions. Some conclude that this process occurs in early sensory cortices, but others that this occurs in areas central to sensory cortices. Here, we sought to determine whether sensory neurons process and encode physical stimulus properties of different modalities (tactile and acoustic). For this, we designed a bimodal detection task where the senses of touch and hearing compete from trial to trial. Two Rhesus monkeys performed this novel task, while neural activity was recorded in areas 3b and 1 of the primary somatosensory cortex (S1). We analyzed neurons' coding properties and variability, organizing them by their receptive field's position relative to the stimulation zone. Our results indicate that neurons of areas 3b and 1 are unimodal, encoding only the tactile modality in both the firing rate and variability. Moreover, we found that neurons in area 3b carried more information about the periodic stimulus structure than those in area 1, possessed lower response and coding latencies, and had a lower intrinsic time scale. In sum, these differences reveal a hidden processing-based hierarchy. Finally, using a powerful nonlinear dimensionality reduction algorithm, we show that the activity from areas 3b and 1 can be separated, establishing a clear division in the functionality of these two subareas of S1.

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The dorsal premotor cortex (DPC) has classically been associated with a role in preparing and executing the physical motor variables during cognitive tasks. While recent work has provided nuanced insights into this role, here we propose that DPC also participates more actively in decision-making. We recorded neuronal activity in DPC while two trained monkeys performed a vibrotactile categorization task, utilizing two partially overlapping ranges of stimulus values that varied on two physical attributes: vibrotactile frequency and amplitude. We observed a broad heterogeneity across DPC neurons, the majority of which maintained the same response patterns across attributes and ranges, coding in the same periods, mixing temporal and categorical dynamics. The predominant categorical signal was maintained throughout the delay, movement periods and notably during the intertrial period. Putting the entire population's data through two dimensionality reduction techniques, we found strong temporal and categorical representations without remnants of the stimuli's physical parameters. Furthermore, projecting the activity of one population over the population axes of the other yielded identical categorical and temporal responses. Finally, we sought to identify functional subpopulations based on the combined activity of all stimuli, neurons, and time points; however, we found that single-unit responses mixed temporal and categorical dynamics and couldn't be clustered. All these point to DPC playing a more decision-related role than previously anticipated.

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OBJECTIVES: To: 1. Describe the frequency of viral RNA detection in stools in a cohort of patients infected with SARS-CoV-2, and 2. Perform a systematic review to assess the clearance time in stools of SARS-CoV-2. METHODS: We conducted a prospective cohort study in two centers between March and May 2020. We included SARS-CoV-2 infected patients of any age and severity. We collected seriated nasopharyngeal swabs and stool samples to detect SARS-CoV-2. After, we performed a systematic review of the prevalence and clearance of SARS-CoV-2 in stools (PROSPERO-ID: CRD42020192490). We estimated prevalence using a random-effects model. We assessed clearance time by using Kaplan-Meier curves. RESULTS: We included 32 patients; mean age was 43.7±17.7 years, 43.8% were female, and 40.6% reported gastrointestinal symptoms. Twenty-five percent (8/32) of patients had detectable viral RNA in stools. The median clearance time in stools of the cohort was 11[10-15] days. Systematic review included 30 studies (1392 patients) with stool samples. Six studies were performed in children and 55% were male. The pooled prevalence of viral detection in stools was 34.6% (twenty-four studies, 1393 patients; 95%CI:25.4-45.1); heterogeneity was high (I2:91.2%, Q:208.6; p≤0.001). A meta-regression demonstrates an association between female-gender and lower presence in stools (p=0.004). The median clearance time in stools was 22 days (nineteen studies, 140 patients; 95%CI:19-25). After 34 days, 19.9% (95%CI:11.3-29.7) of patients have a persistent detection in stools. CONCLUSIONS: Detection of SARS-CoV-2 in stools is a frequent finding. The clearance of SARS-CoV-2 in stools is prolonged and it takes longer than nasopharyngeal secretions.

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We examined respiratory disease short-term disability claims submitted to the Mexican Social Security Institute during 2020. A total of 1,631,587 claims were submitted by 19.1 million insured workers. Cumulative incidence (8.5%) was 3.6 times higher than that for January 2015‒December-2019. Workers in healthcare, social assistance, self-service, and retail stores were disproportionately affected.

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Resumen: Introducción: el retraso en el inicio de la nutrición enteral (NE), a diferencia de la NE precoz, está asociado a resultados adversos en los pacientes críticos. Objetivos: correlacionar el tiempo de inicio de la nutrición con la mortalidad, días de ventilación mecánica, estancia en la unidad de cuidados intensivos (UCI) y estancia hospitalaria. Material y métodos: se realizó un estudio tipo cohorte, retrospectivo, comparativo de los pacientes hospitalizados durante un periodo de enero a julio de 2022 en la Unidad de Cuidados Intensivos del Hospital Centro Médico ABC Campus Observatorio. Se incluyeron todos los pacientes ingresados que recibieron nutrición enteral. Resultados: de 242 pacientes, 62.8% son masculinos, con una mediana de edad de 65 (62.8-67.7) años, de los cuales 22% de la población requirió ventilación mecánica, encontrando una mortalidad global de 6.3%. Se observó diferencia significativa con p = 0.001, con un OR 0.210 (0.087-0.509) en la mortalidad de los pacientes con nutrición temprana 5.5 versus 13.2% nutrición tardía, sin diferencia en días de ventilación, estancia en la unidad de cuidados intensivos adultos (UCIA) ni hospitalización. Conclusiones: el retraso en la NE se asoció significativamente con menos días libres de UCI, estancia más prolongada en la UCI, hospitalizaciones más largas y mortalidad en comparación con la NE temprana.

Abstract: Introduction: the delay in the start of enteral nutrition (EN) or late EN, unlike early EN, is associated with adverse outcomes in critically ill patients. Objectives: to correlate the start time of nutrition with mortality, days of mechanical ventilation, Intensive Care Unit (ICU) and hospital length of stay. Material and methods: a retrospective, comparative, cohort study of hospitalized patients during the period from January to July 2022 in the ICU of the ABC Medical Center Observatory Campus was carried out. All hospitalized patients who received enteral nutrition were included. Results: of 242 patients, 62.8% were male, with a median age of 65 (62.8-67.7) years, 22% of the population required mechanical ventilation, finding an overall mortality of 6.3%. A significant difference was found with p = 0.001, with an OR 0.210 (0.087-0.509) in the mortality of patients with early nutrition 5.5 vs 13.2% late nutrition, without difference in days of mechanical ventilation, ICU or hospitalization length of stay. Conclusions: delayed EN was significantly associated with less ICU-free days, longer intrahospital length of stay and mortality, compared with early EN.

Resumo: Introdução: o atraso no início da nutrição enteral (NE) ou NE tardia, ao contrário da NE precoce, está associado a desfechos adversos em pacientes críticos. Objetivos: correlacionar o tempo de início da nutrição com mortalidade, dias de ventilação mecânica, internação na UTI e internação. Material e métodos: realizou-se um estudo de coorte, retrospectivo e comparativo de pacientes internados no período de janeiro a julho de 2022 na UTI do Hospital Centro Médico ABC Campus Observatorio. Todos os pacientes admitidos que receberam nutrição enteral foram incluídos. Resultados: dos 242 pacientes, 62.8% são do sexo masculino, com idade média de 65 (62.8-67.7) anos, dos quais 22% da população necessitou de ventilação mecânica, encontrando-se uma mortalidade geral de 6.3%. Uma diferença significativa foi encontrada com p = 0.001, com OR 0.210 (0.087-0.509) na mortalidade de pacientes com nutrição precoce 5.5 vs 13.2% nutrição tardia, sem diferença em dias de ventilação, permanência na UTI ou hospitalização. Conclusões: o atraso da NE foi significativamente associada a menos dias livres de UTI, estadias mais longas na UTI, internações mais longas e mortalidade, em comparação com NE precoce.

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Introducción: Las instituciones penitenciarias en muchos países han sido escenarios de brotes de la COVID-19, debido a los inconvenientes para mantener el distanciamiento social, a la falta de protección individual y la mala cobertura sanitaria, que se conjugan para condicionar esta situación. Objetivo: Caracterizar el cumplimiento de la vigilancia y las medidas de prevención y control de la COVID-19 en instituciones penitenciarias. Métodos: Se realizó un estudio descriptivo y transversal en 8 centros penitenciarios de la provincia de Santiago de Cuba durante mayo del 2020. Con independencia de los datos numéricos aportados, se decidió efectuar resúmenes fundamentalmente cualitativos de los aspectos considerados en cada una de las visitas. Resultados: En la evaluación de la organización y la estructura de cada una de las instituciones visitadas, así como del cumplimiento de las medidas de control y prevención individuales y colectivas, se obtuvieron resultados satisfactorios. También se comprobó que las unidades disponían de los recursos humanos y materiales que garantizaban la observancia de las medidas. Conclusiones: Quedaron demostrados el cuidado y la atención sanitaria a este grupo vulnerable a la COVID-19 y se identificaron otras posibles acciones para ello.

Introduction: In many countries penal institutions have been scenary of COVID-19 outbreaks, due to the adverse conditions for maintaining social distancing, lack of individual protection and bad sanitary structure, which confluence to make possible this situation. Objective: To characterize the fulfilment of survillance and the control and prevention measures for COVID-19 in penal institutions. Methods: A descriptive and cross-sectional study was carried out in 8 penal institutions from Santiago de Cuba during May, 2020. Independently from the obtained numerical data, it was decided to carry out summaries mainly of qualitative type, of those aspects considered in each of the visits. Results: Satisfactory results were obtained in the evaluation of the organization and the structure of each of the visited institutions, as well as in the fulfilment of the individual and collective control and prevention measures. It was also verified that the institutions had the human and material resources guarranting the fulfilment of the measures. Conclusions: Care and sanitary survillance to this vulnerable group to COVID-19 were demostrated, and other possible actions were identified for this purpose.

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Resumen: Objetivo: Describir el comportamiento de la epidemia de SARS-CoV-2 entre los trabajadores afiliados al Instituto Mexicano del Seguro Social (IMSS). Material y métodos: Se analizaron las incapacidades temporales para el trabajo por enfermedades respiratorias (ITT-ER), las hospitalizaciones y defunciones asociadas durante el periodo del 1 marzo al 31 diciembre 2020. Se estimó la tasa de ataque (TA) por SARS-CoV-2, así como los riesgos relativos (RR) de ITT-ER, hospitalización y defunción. Resultados: De los trabajadores afiliados al IMSS, 8.8% (n=1 730 334) recibió al menos una ITT-ER. La TA fue mayor en mujeres y en ambos sexos fue menor en el grupo de >60 años. Los RR de hospitalización y defunción fueron mayores en hombres y aumentaron con la edad. Comparado con las ITT-ER de 2015-2019, Durango, Tamaulipas y Nuevo León tuvieron un RR mayor de ITT-ER que el resto del país. Conclusiones: La epidemia de SARS-CoV-2 tuvo repercusiones importantes en los trabajadores afiliados al IMSS; se observó un exceso de ITT-ER de 4.6 veces respecto a la frecuencia esperada y cerca de un millón de casos de SARS-CoV-2. Los datos sugieren que el sistema de ITT-ER puede ser utilizado como elemento adicional para la vigilancia epidemiológica de enfermedades emergentes.

Abstract: Objective: To describe the behavior of SARS-CoV-2 epidemic among workers affiliated to the Mexican Social Security Institute. Materials and methods: We analyzed Short Term Disability Claims due to Respiratory Diseases (RD-STDC), associated hospitalizations and deaths (March 1 - December 31, 2020). We estimated the attack rate (AR) for SARS-CoV-2, and relative risks (RR) of TWD-RD, hospitalization and deaths. Results: 1 730 334 workers received at least one RD-STDC. AR was higher in women and in both sexes it was lower in >60 years old. RR of hospitalization and death were higher in men and increased with age. Compared with RD-STDC of 2015-2019, the states of Durango, Tamaulipas and Nuevo Leon had a higher RR of RD-STDC than the rest of the country. Conclusions: The SARS-CoV-2 epidemic impacted IMSS-affiliated workers significantly. We observed a 4.6 fold excess in RD-STDC compared to the expected frequency and nearly 1 million SARS-CoV-2 cases in this population. Our data suggest that the RD-STDC system can be used as an additional resource for epidemiological surveillance of emerging diseases.

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Malakoplakia is a rare disease. Clinical presentation is non-specific, making its diagnosis an incidental finding on histopathological analysis. The aim of this case report is to describe a patient diagnosed with colon, renal and soft tissue malacoplakia mimicking a locally advanced colorectal cancer. A 75-year-old man was admitted due to intense abdominal pain. No relevant findings at the physical examination. Computed tomography showed parietal thickening of the descending colon with left kidney, iliopsoas muscle and retroperitoneum involvement. An elevated blood serum creatinine, elevated glycated hemoglobin and urinary infection were detected. Surgery was decided for suspicious symptomatic colonic neoplasm. Left segmental colectomy with left partial nephrectomy and retroperitoneal soft tissue resection was performed. Pathology report was compatible with malakoplakia. Malakoplakia is a rare disease and may affect multiple organs. Because there are no clinical-specific findings, diagnosis is usually made with histopathological study of the surgical specimen.

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Una manera para lograr más efectividad en la decisión terapéutica en recién nacidos que cursan con infecciones, es tener conocimiento del microorganismo causal más común, según el tipo de infección por la cual cursa el paciente. Por ello el médico debe estar familiarizado con el mapa microbiológico de la institución donde trabaja y estar actualizado en el espectro de microorganismos habituales que informa la literatura, así como aquellos emergentes y reemergentes. Se revisa el estado actual de reportes de frecuencia de los microorganismos causales en recién nacidos con infecciones, tomados de la literatura médica nacional e internacional con el propósito de orientar al médico de asistencia del posible microorganismo causal más probable en base a la clínica del paciente y además, a tomar la clasificación de las infecciones como herramienta que aporta una guía de los agentes que afectan con más frecuencia al paciente recién nacido, y los factores de riesgo asociados. Se concluye que es factible y beneficioso este enfoque que le permite al médico asistencial ser más efectivo en la decisión del tratamiento a seguir. Es su deber estar familiarizado con el mapa microbiológico de la institución donde trabaja y estar actualizado en el espectro de microorganismos habituales que informa la literatura, así como aquellos emergentes y reemergentes(AU)

One way to achieve more effectiveness in therapeutic decisions related to newborns with infections is to be aware of the most common causal microorganism, depending on the type of infection the patient is suffering. Therefore, the physician should be familiar with the microbiological map of the institution where he/she works and be updated in the spectrum of common microorganisms reported by the literature, as well as those emerging and re-emerging. The current status of frequency reports of causal microorganisms in newborns with infections, taken from national and international literature, is reviewed to guide the assistance physician on the most likely possible causal microorganism based on the patient's clinic and also to use the classification of infections as a tool that provides guidance on the agents that most often affect the newborn patients, and associated risk factors. It is concluded that this approach that allows the assistance physician to be more effective in the decision of treatment to follow is feasible and beneficial. It is the physician's duty to be familiar with the microbiological map of the institution where he/she works and be updated on the spectrum of common microorganisms reported by the literature, as well as those emerging and re-emerging(AU)

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A crucial role of cortical networks is the conversion of sensory inputs into perception. In the cortical somatosensory network, neurons of the primary somatosensory cortex (S1) show invariant sensory responses, while frontal lobe neuronal activity correlates with the animal's perceptual behavior. Here, we report that in the secondary somatosensory cortex (S2), neurons with invariant sensory responses coexist with neurons whose responses correlate with perceptual behavior. Importantly, the vast majority of the neurons fall along a continuum of combined sensory and categorical dynamics. Furthermore, during a non-demanding control task, the sensory responses remain unaltered while the sensory information exhibits an increase. However, perceptual responses and the associated categorical information decrease, implicating a task context-dependent processing mechanism. Conclusively, S2 neurons exhibit intriguing dynamics that are intermediate between those of S1 and frontal lobe. Our results contribute relevant evidence about the role that S2 plays in the conversion of touch into perception.

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Resumen: Objetivo: Establecer criterios médicos de retorno al trabajo en personal con riesgo de complicaciones por Covid-19. Material y métodos. Se realizó una revisión sistemática para identificar las condiciones y las características clínicas que influyen en el riesgo de desarrollar Covid-19 grave. Resultados: Se ha demostrado incremento del riesgo en obesidad, edad >60 años, diabetes mellitus, hipertensión arterial, enfermedad pulmonar obstructiva crónica, enfermedad cardiovascular, enfermedad renal crónica y cáncer. Solamente en diabetes se ha estudiado si el control previo influye. Se proponen condiciones específicas y el nivel de riesgo epidemiológico para el retorno al trabajo. Conclusiones: El retorno laboral de estos grupos debe priorizarse buscando favorecer el control de la enfermedad, identificando el estado de salud que incrementa el riesgo y protegiendo el derecho al trabajo. Se presentan recomendaciones para guiar la reincorporación al trabajo.

Abstract: Objective: To establish medical criteria for return to work to people with increased risk of severe illness from Covid-19. Materials and methods. We performed a systematic review to identify the conditions and clinical characteristics that influence the risk of developing severe Covid-19. Results: Increased risk has been shown in obesity, age >60 years old, diabetes mellitus, arterial hypertension, chronic obstructive pulmonary disease, cardiovascular disease, chronic kidney disease and cancer. Only in diabetes it has been studied whether prior control influences. Specific medical conditions and epidemiological risk level for return to work are proposed. Conclusions: Return to work of vulnerable groups should be prioritized, seeking to promote disease control, identifying health conditions that increase risk, and protecting the right to work. We present recommendations to guide the return to work.

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Resumen El ácido acetilsalicílico (Aspirina) es un inhibidor irreversible de la acetil ciclooxigenasa (COX) y su actividad no es restaurada hasta la formación de nuevas plaquetas. Sus efectos benéficos terapéuticos cardiovasculares lo han convertido en la piedra angular del tratamiento del paciente con enfermedad arterial coronaria. Existe una población de pacientes con indicación absoluta para su uso; sin embargo, la presencia o antecedente de hipersensibilidad a esta molécula conlleva un alto riesgo de complicaciones no relacionadas con enfermedad cardiovascular. En algunos de estos pacientes es crucial conocer e implementar protocolos de desensibilización para el ácido acetilsalicílico y, de esta manera, continuar con el uso de esta estrategia terapéutica necesaria e idónea en esta población.

Abstract Acetylsalicylic acid (Aspirin) is an irreversible inhibitor of acetyl cyclooxygenase (COX) and its activity is not restored until new platelets are formed. Its beneficial therapeutic cardiovascular effects have made it the cornerstone of the treatment of patients with coronary artery disease. There is a population of patients with absolute indication for its use, however, the presence or history of hypersensitivity to this molecule leads to a high risk of complications unrelated to their cardiovascular disease. It is vital to know and implement in some of these patients, desensitization protocols for acetyl salicylic acid and in this way to continue the use of this therapeutic strategy necessary and appropriate in this population.

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La Encefalitis por Anticuerpos contra el Receptor NMDA es un reto debido a la amplia lista de posibilidades diagnósticas a las que se asemeja la sintomatología inicial. Es una enfermedad cuya fisiopatología está dada por la generación y acción de anticuerpos, inducidos mayormente por agentes externos (virus) e internos (algunos tumores), sobre NMDAR (receptor N-metil-D-aspartato) que puede cursar con alteraciones neurológicas, psiquiátricas y autonómicas, usualmente afectando a población femenina adulta joven y que en ocasiones forma parte de un síndrome paraneoplásico. Su manejo se basa en inmunoterapia con corticosteroides, inmunoglobulina intravenosa o en casos refractarios, plasmaféresis. La eficacia de estas terapias aumenta con el diagnóstico oportuno, sin embargo con frecuencia el tratamiento se aplica tardíamente por lo difícil del acierto diagnóstico. Presentamos el caso clínico de una femenina de 22 años, que debutó con manifestaciones neuropsiquiátricas, inicialmente medicada con antipsicóticos y que desarrolló rigidez, aumento de creatina quinasa y estatus epiléptico, por lo cual se sospechó síndrome neuroléptico maligno, ameritando hospitalización en la unidad de cuidados intensivos. Ante la nula mejoría, se replanteó el diagnóstico, con sospecha de encefalitis autoinmune y se instauró el tratamiento específico, con lo cual la paciente pudo retornar a su vida diaria sin déficit. (provisto por Infomedic International)

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Objetivo. Describir el comportamiento de la epidemia de SARS-CoV-2 entre los trabajadores afiliados al Instituto Mexicano del Seguro Social (IMSS). Material y métodos. Se analizaron las incapacidades temporales para el trabajo por enfermedades respiratorias (ITT-ER), las hospitalizaciones y defunciones asociadas durante el periodo del 1 marzo al 31 diciembre 2020. Se estimó la tasa de ataque (TA) por SARS-CoV-2, así como los riesgos relativos (RR) de ITT-ER, hos-pitalización y defunción. Resultados. De los trabajadores afiliados al IMSS, 8.8% (n=1 730 334) recibió al menos una ITT-ER. La TA fue mayor en mujeres y en ambos sexos fue menor en el grupo de >60 años. Los RR de hospitalización y defunción fueron mayores en hombres y aumentaron con la edad. Comparado con las ITT-ER de 2015-2019, Durango, Tamaulipas y Nuevo León tuvieron un RR mayor de ITT-ER que el resto del país. Conclusiones. La epidemia de SARS-CoV-2 tuvo repercusiones importantes en los trabajadores afiliados al IMSS; se observó un exceso de ITT-ER de 4.6 veces respecto a la frecuencia esperada y cerca de un millón de casos de SARS-CoV-2. Los datos sugieren que el sistema de ITT-ER puede ser utilizado como elemento adicional para la vigilancia epidemiológica de enfermedades emergentes.

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We report the case of a patient with ruptured middle cerebral artery aneurysm, subarachnoid hemorrhage and frontal intracerebral hemorrhage, who secondarily presented with delayed cerebral ischemia and bilateral occipital infarcts, with complete vision loss, visual anosognosia, and confabulations as the main symptoms. Additionally, the patient had defined features of Cotard syndrome, as revealed by persistent nihilistic delusions. The brain imaging studies showed a bilateral occipital ischemic lesion, as well as frontal and parietal hemorrhagic lesions in the right hemisphere. We address the general theories of anosognosia, confabulation and the problem of why a bilateral occipital lesion is not enough for these metacognitive defects to exist. The presence of right frontal and or parietal hemisphere lesions could be necessary features in most cases.

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Introducción: La presencia de leucocituria nos orienta hacia la probabilidad de infección del tracto urinario en niños. Objetivo: Determinar si la leucocituria significativa es un marcador de infección urinaria aun sin cultivo de orina positivo. Métodos: Estudio descriptivo y retrospectivo en pacientes egresados de los Servicios de Neonatología y Nefrología del Hospital Pediátrico Universitario Juan Manuel Márquez, entre enero 2018-diciembre 2019, que incluyó 124 niños de 2 años de edad; un grupo con infección del tracto urinario confirmada (clínica, leucocituria mayor 10 000 leucocitos/ml y con urocultivos positivos) y otro sospechada (clínica, con leucocituria significativa de más 100 000 leucocitos/ml, pero sin cultivo de orina positivo). Se compararon variables clínicas, de laboratorio y de radioimagen. Resultados: En 78,6 por ciento de los niños se aisló Escherichia coli. La fiebre fue un hallazgo clínico frecuente. El reactante de fase aguda con mayor variación fue la velocidad de sedimentación globular (71,0 por ciento), presentaron alteraciones del ultrasonido (79,8 por ciento) y uretrocistografía miccional (50,0 por ciento). No hubo diferencias estadísticamente significativas al comparar las variables clínicas, de laboratorio y de radioimagen entre el grupo de pacientes con infección del tracto urinario confirmada por urocultivo positivo y el grupo sospechado por la clínica, con leucocituria significativa de más 100 000 leucocitos/ml, pero sin urocultivo positivo. Conclusiones: En los niños con manifestaciones clínicas de infección, con presencia de una leucocituria significativa (más 100 000 leucocitos/ml), aunque no cuenten con un resultado positivo del urocultivo, se les debe proporcionar la atención médica establecida para un paciente con infección del tracto urinario(AU)

Introduction: The presence of leukocyturia guides towards the probability of urinary tract infection in children. Objective: Determine whether significant leukocyturia is a marker of urinary tract infection even without positive urine culture. Methods: Descriptive and retrospective study in patients discharged from the Neonatology and Nephrology Services of Juan Manuel Márquez University Pediatric Hospital, from January 2018 to December 2019, which included 124 children of 2 years of age; one group with confirmed urinary tract infection (clinical, leukocyturia of more than 10 000 leukocytes/ml and with positive urine cultures) and another group of suspected ones (clinical, with significant leukocyturia of more than 100 000 leukocytes/ml, but without positive urine culture). Clinical, laboratory and radioimaging variables were compared. Results: Escherichia coli was isolated in 78.6 percent of the children. Fever was a common clinical finding. The reactant acute phase with the greatest variation was the erythrocyte sedimentation rate (71.0 percent), there were ultrasound alterations (79.8 percent) and voiding urethrocystography (50.0 percent). There were no statistically significant differences when comparing clinical, laboratory and radioimaging variables between the group of patients with urine tract infection confirmed by positive urine culture and the group suspected by the clinic findings, with significant leukocyturia of more than 100 000 leukocytes/ml, but without positive urine culture. Conclusions: In children with clinical manifestations of infection, with the presence of significant leukocyturia (more than 100 000 leukocytes/ml), even if they do not have a positive urine culture result, they should be provided with the medical care established for a patient with urinary tract infection(AU)

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Objetivo. Establecer criterios médicos de retorno al trabajo en personal con riesgo de complicaciones por Covid-19. Material y métodos. Se realizó una revisión sistemática para identificar las condiciones y las características clínicas que influyen en el riesgo de desarrollar Covid-19 grave. Resultados. Se ha demostrado incremento del riesgo en obesidad, edad >60 años, diabetes mellitus, hipertensión arterial, enfermedad pulmonar obstructiva crónica, enfermedad cardiovascular, enfermedad renal crónica y cáncer. Solamente en diabetes se ha estudiado si el control previo influye. Se proponen condiciones específicas y el nivel de riesgo epidemiológico para el retorno al trabajo. Conclusiones. El retorno laboral de estos grupos debe priorizarse buscando favorecer el control de la enfermedad, identificando el estado de salud que incrementa el riesgo y protegiendo el derecho al trabajo. Se presentan recomendaciones para guiar la reincorporación al trabajo.

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