Challenges in treating children with optic pathway gliomas: an 18-year experience from a middle-income country.

Introduction: Patients with optic pathway gliomas (OPG) have good survival rates although their long-term quality of life can be affected by the tumor or treatment-related morbidity. This retrospective study sought to describe the clinical presentation and outcomes of children with OPG at a tertiary center in Mexico. Methods: Consecutive patients <18 years-of-age with newly diagnosed OPG between January 2002 and December 2020 at the Hospital Civil de Guadalajara Dr. Juan I. Menchaca in Guadalajara, Mexico were included. Results: Thirty patients were identified with a median age of six years. The most frequent clinical manifestations were loss of visual acuity (40%) and headaches (23%). Neurofibromatosis-1 was found in 23.3% of the patients. Surgery, either biopsy or resection, was done in 20 of 30 patients. Two patients died shortly after initial surgery. The 5-year event-free survival (EFS) was 79.3% ± 10.8% and the 5-year overall survival was 89.5% ± 6.9%. Lower EFS was associated with age less than 3 years, intracranial hypertension at presentation, and diencephalic syndrome. Patients who received surgery as first-line treatment had a 3.1 times greater risk of achieving a performance score of less than 90 points at 6 months after diagnosis (p=0.006). Of 10 patients with vision testing, 5 had improvement in visual acuity, 4 had no changes, and one patient showed worsening. Conclusion: Our data suggests that favorable outcomes can be achieved with OPG in low- and middle-income countries, although a high rate of surgical complications was described leading to a lower overall survival. These data can be used prospectively to optimize treatment at this institute and other middle-income countries through a comprehensive, multidisciplinary approach.

Show us the data: global COVID-19 wastewater monitoring efforts, equity, and gaps.

A year since the declaration of the global coronavirus disease 2019 (COVID-19) pandemic, there were over 110 million cases and 2.5 million deaths. Learning from methods to track community spread of other viruses such as poliovirus, environmental virologists and those in the wastewater-based epidemiology (WBE) field quickly adapted their existing methods to detect SARS-CoV-2 RNA in wastewater. Unlike COVID-19 case and mortality data, there was not a global dashboard to track wastewater monitoring of SARS-CoV-2 RNA worldwide. This study provides a 1-year review of the "COVIDPoops19" global dashboard of universities, sites, and countries monitoring SARS-CoV-2 RNA in wastewater. Methods to assemble the dashboard combined standard literature review, Google Form submissions, and daily, social media keyword searches. Over 200 universities, 1400 sites, and 55 countries with 59 dashboards monitored wastewater for SARS-CoV-2 RNA. However, monitoring was primarily in high-income countries (65%) with less access to this valuable tool in low- and middle-income countries (35%). Data were not widely shared publicly or accessible to researchers to further inform public health actions, perform meta-analysis, better coordinate, and determine equitable distribution of monitoring sites. For WBE to be used to its full potential during COVID-19 and beyond, show us the data.

Why Do Not All Living Kidney Donor Candidates Are Accepted for Donation? A Pediatric Center Experience.

BACKGROUND: Living donor kidney transplantation is the best type of renal replacement therapy for patients with end-stage renal disease. Living kidney donors (LKDs) undergo an extensive evaluation before donating, and many potential LKDs are declined. This study aimed to define the reasons for the decline in LKD candidates referred to our center. METHODS: We retrospectively analyzed clinical data of all potential LKDs evaluated between January 2001 and December 2021 at our institution,Western National Medical Center, Pediatric Hospital. Data were obtained by review of an electronic database. RESULTS: A total of 1332 potential LKDs were evaluated, 796 (59.7%) successfully donated; 20 (1.5%) had a complete evaluation, were accepted for donation, and were on the waiting list for intervention; 56 (4.2%) continued in the evaluation process; 200 (15%) were discharged from the program due to administrative aspects, death (donor or receptor), or cadaveric renal transplantation in order of frequency; 56 (4.2%) withdraw by personal choice; and 204 (15.3%) were rejected for donation. Donor-related reasons included medical contraindications (n = 134, 65.7%), anatomic contraindications (n = 38, 18.6%), immunologic barriers (n = 18, 8.8%), and psychological reasons (n = 11, 5.4%). CONCLUSIONS: Despite the large number of potential LKDs, a significant proportion did not proceed for donation for different reasons; in our description, it represents 40.3%. The largest proportion is because of donor-related causes, and most of the reasons result from the candidate's unnoticed chronic diseases.

Effect of single infusion of ketamine on depressive symptoms in elderly patients undergoing ophthalmological surgery: a randomized controlled trial / Efecto de una sola infusión de ketamina sobre síntomas depresivos en pacientes geriátricos sometidos a cirugía oftalmológica: ensayo controlado aleatorizado

Abstract: Introduction: Depressive symptoms are common in elderly surgical patients and are associated with negative outcomes. Although medication can relieve symptoms, only 50% of patients achieve remission using conventional treatments. Recently, ketamine has been shown to improve depression rapidly. However, its use and tolerability in elderly patients has not been widely studied. Material and methods: We conducted a randomized, double-blind, comparative study in patients aged 60 and over who required ophthalmological surgery. Experimental group received 0.5 mg/kg ketamine, whereas the control group received NaCl solution at 0.9%. Both groups received a standardized regimen of conscious sedation. Depressive symptom severity was assessed using the Geriatric Depression Scale-Short Form (GDS-SF) before and after exposure to ketamine infusion; tolerability was also evaluated. A repeated univariate analysis of variance (ANOVA) model examined the direction of changes in depressive symptom severity among groups. Results: 90 patients were randomized. A significant reduction in symptom severity was observed after ketamine infusion (mean change from baseline: -1.6 vs -0.3 in the control group; p = 0.003). No differences emerged between groups in the presence of adverse effects with ketamine infusion. Conclusions: A single infusion of ketamine in elderly patients undergoing ophthalmological surgery is associated with improved depressive symptoms in the first 24 hours of exposure to the drug with a good tolerability profile.

Resumen: Introducción: Los síntomas depresivos son comunes en pacientes quirúrgicos de edad avanzada y se asocian con resultados negativos. Aunque la medicación pueda aliviar los síntomas, sólo el 50% de los pacientes que están envejeciendo alcanzan la remisión usando tratamientos convencionales. Se ha demostrado que la ketamina mejora rápidamente la depresión, sin embargo, su uso y tolerabilidad en pacientes mayores no ha sido estudiada ampliamente. Material y métodos: Se realizó un estudio aleatorizado, doble ciego, comparativo en pacientes de 60 años o más que requirieron cirugía oftalmológica. Un grupo experimental recibió 0.5 mg/kg de ketamina, mientras que el grupo control recibió solución de NaCl al 0.9%. Ambos grupos recibieron un régimen estandarizado de sedación consciente. La severidad de los síntomas depresivos fue evaluada usando la versión acortada de la escala de depresión geriátrica (GDS-SF) antes y después de la exposición a la infusión de la ketamina, la tolerabilidad también fue evaluada. Un modelo de análisis de varianza univariada de medidas repetidas (ANOVA) examinó la dirección de los cambios en la gravedad de los síntomas depresivos entre los grupos. Resultados: 90 pacientes fueron aleatorizados. Se observó, una reducción significativa en la severidad de los síntomas después de la infusión de la ketamina (cambio de la media desde el valor basal: -1.6 versus -0.3 en el grupo de control; p = 0.003). No surgieron diferencias entre los grupos en la presencia de efectos adversos con la infusión de ketamina. Conclusiones: Una sola infusión de ketamina en pacientes geriátricos sometidos a cirugía oftalmológica se asocia con la mejoría de síntomas depresivos en las primeras 24 horas de exposición al fármaco con un buen perfil de tolerabilidad.

Revisión integrativa de la calidad de vida en el trabajo de enfermeras latinoamericanas

Resumen: Introducción: La calidad de vida en el trabajo (CVT) o calidad de vida laboral (CVL) expresa la satisfacción de los trabajadores, en este caso enfermeras, que está directamente relacionada con la seguridad y calidad del cuidado del paciente. Objetivo: Identificar, desde la literatura científica, niveles de satisfacción con la calidad de vida en el trabajo de las enfermeras latinoamericanas, factores de riesgo asociados y repercusiones en la salud. Metodología: Se realizó una revisión integrativa en bases de datos PubMed, SciELO, BVS y Google Académico relacionado con estudios publicados en el período enero 2011 - agosto 2021, en inglés, portugués y español. Resultados: Se seleccionaron 13 artículos que cumplieron los criterios de inclusión, realizados en personal de salud que incluyeron a enfermeras. Se establecieron tres categorías de análisis: Satisfacción e insatisfacción con la calidad de vida en el trabajo por niveles, dimensiones y dominios; Factores sociolaborales asociados a la CVT, y Calidad de vida en el trabajo y sus repercusiones en salud. Conclusión: La revisión permitió identificar aun de forma limitada que la calidad de vida en el trabajo de las enfermeras latinoamericanas mayoritariamente alcanzó niveles medio a bajo, con influencia de factores sociodemográficos y laborales, y con repercusiones en la salud de las enfermeras. Por lo tanto, es emergente profundizar en el estudio del tema, considerando que la insatisfacción con la calidad de vida en el trabajo de estas profesionales puede repercutir tanto en su propia salud como en la calidad del cuidado.

Resumo: Introdução: Qualidade de vida no trabalho (QVT) ou qualidade de vida laboral (QVL) expressa a satisfação dos trabalhadores, neste caso enfermeiras, que é diretamente relacionada com a segurança e a qualidade do atendimento ao paciente. Objetivo: Identificar, a partir da literatura científica, os níveis de satisfação com a qualidade de vida no trabalho das enfermeiras latino-americanas, os fatores de risco associados e as repercussões na saúde. Metodologia: Foi realizada uma revisão integrativa nas bases de dados PubMed, SciELO, BVS e Google Scholar relacionadas a estudos publicados no período de janeiro de 2011 a agosto de 2021, em inglês, português e espanhol. Resultados: Foram selecionados treze artigos que preenchiam os critérios de inclusão, conduzidos em profissionais da saúde que incluía enfermeiras. Foram estabelecidas três categorias de análise: satisfação e insatisfação com a qualidade de vida no trabalho por níveis, dimensões e domínios; fatores sócio-ocupacionais associados ao QVT; e qualidade de vida no trabalho e seu impacto na saúde. Conclusão: A revisão permitiu identificar, mesmo de forma limitada, que a qualidade de vida no trabalho das enfermeiras latino-americanas atingiu em sua maioria níveis médios a baixos, influenciada por fatores sócio-demográficos e de trabalho, com repercussões na saúde das enfermeiras. Portanto, é importante estudar o assunto com mais profundidade, considerando que a insatisfação com a qualidade de vida no trabalho dessas profissionais pode ter repercussões tanto sobre sua própria saúde quanto sobre a qualidade do atendimento.

Abstract: Introduction: Quality of life at work (QOL) or quality of work life (QWL) expresses the satisfaction of workers, in this case nurses, which is directly related to the safety and quality of patient care. Objective: To identify, from the scientific literature, levels of satisfaction with quality of life at work among Latin American nurses, associated risk factors and repercussions on health. Methodology: An integrative review was carried out in PubMed, SciELO, BVS and Google Scholar databases related to studies published in the period January 2011 - August 2021, in English, Portuguese and Spanish. Results: 13 articles were selected that met the inclusion criteria, conducted in health personnel that included nurses. Three categories of analysis were established: satisfaction and dissatisfaction with quality of life at work by levels, dimensions and domains; social and labor factors associated with QOL; and quality of life at work and its impact on health. Conclusion: The review made it possible to identify, even in a limited way, that the quality of life at work of Latin American nurses mostly reached medium to low levels, influenced by sociodemographic and labor factors, and with repercussions on nurses' health. Therefore, it is important to study the subject in depth, considering that dissatisfaction with the quality of life at work of these professionals can have repercussions on their own health as well as on the quality of care.

Aceptabilidad de la vacuna contra la COVID-19 en alumnos de una universidad pública de Honduras / Acceptability of the COVID-19 vaccine in students of a public university in Honduras

La pandemia de la COVID-19 continúa reportando casos y fallecimientos a nivel mundial y nacional. La vacuna contra COVID-19, ha logrado contener la propagación de la enfermedad, sin embargo, todavía no tiene una aceptación total. Objetivo: Determinar el nivel de conocimiento, actitudes y aceptabilidad de la vacuna contra la COVID-19 y factores asociados, en estudiantes de la Universidad Nacional Autónoma de Honduras (UNAH) en año 2021. Métodos: Estudio observacional, transversal, descriptivo con análisis de asociación. La población de estudio fueron los estudiantes de la UNAH. Resultados: Un total de 1,417 estudiantes participaron, de los cuales el 52.3% (741) no estaban vacunados contra la COVID-19. Se encontró que el 93.5% (693/741) aceptaría aplicarse la vacuna. Se realizó una regresión logística binaria múltiple reportando que, el grupo de edad de 40 a 44 años tendrían mayor posibilidad de no aceptabilidad de la vacuna (OR=17, IC95% 2.462-120.661; p=0.004). Con respecto a los factores psicosociales se encontró que, la norma subjetiva y el control conductual inadecuado conllevaría a mayor posibilidad de no aceptación de la vacuna. (OR=11.4, IC95% 3.605- 36.664; p=0.000) y (OR=4.6, IC95% 1.678-12.281; p=0.003), respectivamente. Finalmente, la actitud social y la percepción de riesgo inadecuado implicaría no aceptar la vacuna (OR=13, IC95% 5.683-30.322; p=0.000) y (OR=6, IC95% 2.189- 15.159; p=0.000), respectivamente. Discusión: Según los resultados de este estudio, los estudiantes que no aceptaron vacunarse tuvieron influencia en su entorno familiar, social y de su propia capacidad para decidir, sumado a una percepción de riesgo inadecuada por una influencia directa en los mismos...(AU)

An Indoor Navigation Methodology for Mobile Devices by Integrating Augmented Reality and Semantic Web.

Indoor navigation systems incorporating augmented reality allow users to locate places within buildings and acquire more knowledge about their environment. However, although diverse works have been introduced with varied technologies, infrastructure, and functionalities, a standardization of the procedures for elaborating these systems has not been reached. Moreover, while systems usually handle contextual information of places in proprietary formats, a platform-independent model is desirable, which would encourage its access, updating, and management. This paper proposes a methodology for developing indoor navigation systems based on the integration of Augmented Reality and Semantic Web technologies to present navigation instructions and contextual information about the environment. It comprises four modules to define a spatial model, data management (supported by an ontology), positioning and navigation, and content visualization. A mobile application system was developed for testing the proposal in academic environments, modeling the structure, routes, and places of two buildings from independent institutions. The experiments cover distinct navigation tasks by participants in both scenarios, recording data such as navigation time, position tracking, system functionality, feedback (answering a survey), and a navigation comparison when the system is not used. The results demonstrate the system's feasibility, where the participants show a positive interest in its functionalities.

Asociación entre mortalidad por Covid-19 y contaminación atmosférica en ciudades mexicanas / Association between Covid-19 mortality and atmospheric pollution in Mexican cities

Resumen: Objetivo: Analizar la asociación entre la exposición crónica a contaminantes atmosféricos y la tasa de mortalidad por Covid-19 en ciudades mexicanas. Material y métodos: Estudio ecológico en 25 ciudades mexicanas utilizando el reporte de casos diarios de muertes por Covid-19 (febrero a junio 2020) y datos validados de contaminantes atmosféricos, considerando concentraciones promedio en cada ciudad en el último año. Se utilizaron modelos de regresión Poisson, con modelos aditivos generalizados y variables de ajuste. Resultados: Se encontró un incremento significativo de 3.5% (IC95% 2.3-4.7) en la tasa de mortalidad por Covid-19 por incremento de 1µg/m3 de NO2. La asociación con PM2.5 fue no significativa, con un incremento de 1.8% por cada µg/m3. Conclusiones: Los resultados sugieren una asociación entre la mortalidad por Covid-19 y la exposición a NO2. Esta primera aproximación del riesgo asociado con la contaminación del aire requiere de análisis más precisos, pero es consistente con estudios de otras regiones.

Abstract Objective: To analyze the relationship between chronic exposures to air pollution with Covid-19 death rate in Mexican cities. Materials and methods: Ecological study in 25 Mexican cities using the report of daily Covid-19 deaths (from February to June 2020) and validated data of air pollutants, considering average concentrations in each city for the last year. Poisson regression models using generalized additive models with adjustment variables (GAM) were used. Results: A significant increase of 3.5% (95% CI 2.3-4.7) was found in Covid-19 death rate for each 1µg/m3 in annual concentration of NO2. The association with PM2.5 was not significant, with an increase of 1.8% for each 1µg/m3. Conclusions: Results suggest an association between Covid-19 mortality and chronic exposure to NO2. This first approximation of the risk associated with air pollution requires a more precise analysis, but is consistent with what was observed in other studies.

Asociación entre mortalidad por Covid-19 y contaminación atmosférica en ciudades mexicanas.

Objetivo. Analizar la asociación entre la exposición crónica a contaminantes atmosféricos y la tasa de mortalidad por Covid-19 en ciudades mexicanas. Material y métodos. Estudio ecológico en 25 ciudades mexicanas utilizando el reporte de casos diarios de muertes por Covid-19 (febrero a junio 2020) y datos validados de contaminantes atmosféricos, considerando concentraciones promedio en cada ciudad en el último año. Se utilizaron modelos de regresión Poisson, con modelos aditivos generalizados y variables de ajuste. Resultados. Se encontró un incremento significativo de 3.5% (IC95% 2.3-4.7) en la tasa de mortalidad por Covid-19 por incremento de 1µg/m3 de NO2. La asociación con PM2.5 fue no significativa, con un incremento de 1.8% por cada µg/ m3. Conclusiones. Los resultados sugieren una asociación entre la mortalidad por Covid-19 y la exposición a NO2. Esta primera aproximación del riesgo asociado con la contami-nación del aire requiere de análisis más precisos, pero es consistente con estudios de otras regiones.

Supervivenciade pacientes pediátricos con inmunodeficiencias primarias en un hospital público del occidente de México / Survival of pediatric patients with primary immunodeficiencies in a public hospital in western Mexico

Se presenta una serie de casos de inmunodeficiencias primarias y se describen las variables asociadas a supervivencia en pacientes ≤ 16 años. Los diagnósticos fueron acordes a los criterios de la Unión Internacional de las Sociedades de Inmunología. Se realizó un análisis de supervivencia mediante curvas de Kaplan-Meier.Entre los años 2004 y 2019, se diagnosticaron 40 pacientes con inmunodeficiencias primarias. Las más frecuentes fueron inmunodeficiencias que afectaban la inmunidad celular y humoral, el 32,5 %, y deficiencias predominantemente de anticuerpos, el 32,5 %. La mediana de edad al inicio de los síntomas y al momento del diagnóstico fue de 3,01 y 10,4 meses, respectivamente. Fallecieron el 35 % y el riesgo fue mayor en pacientes con inmunodeficiencias que afectaban la inmunidad celular y humoral y en quienes presentaron manifestaciones clínicas y tuvieron el diagnóstico en los primeros seis meses de vida.

A case series of primary immunodeficiencies is presented and outcome measures associated with survival among patients ≤ 16 years old are described. Diagnoses were made based on the criteria by the International Union of Immunological Societies. Survival was analyzed using Kaplan-Meier curves.Between 2004 and 2019, 40 patients were diagnosed with primary immunodeficiencies. The most common were immunodeficiencies affecting humoral and cell-mediated immunity (32.5 %) and predominantly antibody deficiencies (32.5 %). The median age at the onset of symptoms and at the time of diagnosis was 3.01 and 10.4 months, respectively. Thirty-five percent of patients died, and the risk was higher among those with immunodeficiencies affecting humoral and cell-mediated immunity and those who developed clinical manifestations and were diagnosed in the first 6 months of life

Survival of pediatric patients with primary immunodeficiencies in a public hospital in western Mexico. / Supervivencia de pacientes pediátricos con inmunodeficiencias primarias en un hospital público del occidente de México.

A case series of primary immunodeficiencies is presented and outcome measures associated with survival among patients ≤ 16 years old are described. Diagnoses were made based on the criteria by the International Union of Immunological Societies. Survival was analyzed using Kaplan-Meier curves. Between 2004 and 2019, 40 patients were diagnosed with primary immunodeficiencies. The most common were immunodeficiencies affecting humoral and cell-mediated immunity (32.5 %) and predominantly antibody deficiencies (32.5 %). The median age at the onset of symptoms and at the time of diagnosis was 3.01 and 10.4 months, respectively. Thirty-five percent of patients died, and the risk was higher among those with immunodeficiencies affecting humoral and cell-mediated immunity and those who developed clinical manifestations and were diagnosed in the first 6 months of life.

Se presenta una serie de casos de inmunodeficiencias primarias y se describen las variables asociadas a supervivencia en pacientes ≤ 16 años. Los diagnósticos fueron acordes a los criterios de la Unión Internacional de las Sociedades de Inmunología. Se realizó un análisis de supervivencia mediante curvas de Kaplan-Meier. Entre los años 2004 y 2019, se diagnosticaron 40 pacientes con inmunodeficiencias primarias. Las más frecuentes fueron inmunodeficiencias que afectaban la inmunidad celular y humoral, el 32,5 %, y deficiencias predominantemente de anticuerpos, el 32,5 %. La mediana de edad al inicio de los síntomas y al momento del diagnóstico fue de 3,01 y 10,4 meses, respectivamente. Fallecieron el 35 % y el riesgo fue mayor en pacientes con inmunodeficiencias que afectaban la inmunidad celular y humoral y en quienes presentaron manifestaciones clínicas y tuvieron el diagnóstico en los primeros seis meses de vida.

[Association between Covid-19 mortality and atmospheric pollution in Mexican cities]. / Asociación entre mortalidad por Covid-19 y contaminación atmosférica en ciudades mexicanas.

Objective. To analyze the relationship between chronic exposures to air pollution with Covid-19 death rate in Mexican cities. Materials and methods. Ecological study in 25 Mexican cities using the report of daily Covid-19 deaths (from February to June 2020) and validated data of air pollutants, considering average concentrations in each city for the last year. Poisson regression models using generalized additive models with adjustment variables (GAM) were used. Results. A significant increase of 3.5% (95% CI 2.3-4.7) was found in Covid-19 death rate for each 1µg/m3 in annual concentration of NO2. The association with PM2.5 was not significant, with an increase of 1.8% for each 1µg/m3. Conclusions. Results suggest an association between Covid-19 mortality and chronic exposure to NO2. This first approximation of the risk associated with air pollution requires a more precise analysis, but is consistent with what was observed in other studies.

Duplicación de imagen ultrasonográfica de feto único intrauterino que emula un gemelo inexistente: reporte de un caso / Ultrasonographic image duplication of an intrauterine unique fetus mimicking non-existing twin: case report

Resumen ANTECEDENTES: En Obstetricia, las imágenes en espejo son artefactos ecográficos infrecuentes que, potencialmente, pueden confundirse con embarazos heterotópicos y propiciar errores diagnósticos e intervenciones iatrógenas. Estas imágenes ficticias se generan por la existencia de una superficie reflectora como, por ejemplo, el intestino distendido o la vejiga repleta. CASO CLÍNICO: Paciente de 39 años, con embarazo por fertilización in vitro, que asiste a evaluación ecográfica del primer trimestre. En la ecografía de rutina a las 11 semanas se observó una imagen en espejo y en la resonancia magnética: útero gestante con una estructura retrouterina hipoecoica, sin feto en el interior. La imagen ecográfica en espejo volvió a reproducirse en el tercer trimestre. El embarazo llegó a término y finalizó por vía abdominal, sin que pudieran demostrarse las estructuras que se advirtieron en la resonancia magnética. CONCLUSIONES: Las imágenes en espejo se han reportado en ultrasonidos de diversas localizaciones pero pocos en la Obstetricia. Todo hizo suponer que la superficie reflectora fue la estructura hipoecoica retrouterina observada, transitoriamente, en la resonancia magnética.

Abstract BACKGROUND: In obstetrics, ultrasonic artifactual mirror images are infrequent, but potentially dangerous since they can be mistakenly interpreted as heterotopic pregnancies, precluding diagnostic errors and iatrogenic interventions. These images require a reflection surface such as dilated bowl or plenty bladder to be generated. OBJECTIVE: We report a first trimester scan ghost twin, diagnosed since first trimester of pregnancy. CLINICAL CASE: 39-year-old patient, with pregnancy due to in vitro fertilization, who attends ultrasound evaluation of the first trimester. Routine ultrasound at 11 weeks showed a mirror image and magnetic resonance imaging: a pregnant uterus with a hypoechoic retrouterine structure, with no fetus inside. The ultrasound mirror image reproduced again in the third trimester. The pregnancy came to an end and ended by abdominal route, without being able to demonstrate the structures that were noticed on the MRI. CONCLUSION: Very few reports of obstetric ultrasound mirror images have been reported. We hypothesize that the transient retrouterine hypoecogenic structure observed by MRI was the reflective surface that create the ghost twin image.

La simulación clínica como estrategia de enseñanza-aprendizaje en ciencias de la salud / Clinical simulation as a teaching-learning strategy in health sciences

Las estrategias de enseñanza-aprendizaje en Salud han evolucionado sustancialmente, ubicando a la simulación clínica como parte esencial de los procesos curriculares y de acreditación; sin embargo, debido al tiempo e inversión que requiere, puede verse relegada de incorporarla de forma eficiente y temprana en los procesos educativos. Se expone una panorámica sobre su importancia en la docencia y cómo influye en las competencias clínicas para la atención de salud.

Health teaching-learning strategies have evolved substantially, locating clinical simulation as an essential part of curricular and accreditation processes; however, due to the time and the investment required, it can be relegated to incorporate efficiently and early to education processes. A panoramic view of its importance with teaching a

Estigma familiar percibido por los cuidadores primarios de personas con enfermedad mental / Family stigma perceived by primary caregivers of people with mental illness

Se planteó como objetivo describir el estigma familiar percibido por los cuidadores primarios de personas con enfermedad mental, para lo que empleamos como metodología un estudio de tipo exploratorio descriptivo, basado en la fenomenología eidética, en donde se describió de forma detallada la experiencia de vida frente al estigma de la enfermedad mental percibida por el cuidador primario, buscamos revelar, describir e interpretar el fenómeno. Fueron entrevistados en profundidad 14 cuidadores primarios de pacientes con la técnica de punto donde se presentó la saturación de datos cualitativos, fueron analizados estableciendo categorías y subcategorías que permitieron identificar claros patrones de estigma el estigma experimentado y el estigma por asociación, el estudio se desarrolló en una Institución Prestadora de Servicios de Salud mental. Podemos concluir que se logran identificar claros patrones de estigma asociados a una condición mental, estos patrones son percibidos por el cuidador principal del paciente con dicha alteración; esto abre la puerta a nuevas preguntas relacionadas con los alcances que tiene el rechazo social que sufren las familias y pacientes que adolecen alteraciones mentales; por lo tanto esta problemática deberá ser objeto para continuar con investigaciones de este fenómeno.

The objective was to describe the family stigma perceived by the primary caregivers of people with mental illness, for which we used as a methodology a descriptive exploratory study, based on the eidetic phenomenology, where the life experience was described in detail. To the stigma of mental illness perceived by the primary caregiver, we seek to reveal, describe and interpret the phenomenon. Fourteen primary caregivers of patients were interviewed in depth with the point technique where the saturation of qualitative data was presented, they were analyzed establishing categories and subcategories that allowed to identify clear patterns of stigma, stigma experienced and stigma by association, the study was developed in a Institution that provides mental health services. We can conclude that it is possible to identify clear stigma patterns associated with a mental condition, these patterns are perceived by the main caregiver of the patient with said alteration; this opens the door to new questions related to the scope of the social rejection suffered by families and patients who suffer from mental disorders; therefore, this problem should be the object to continue with investigations of this phenomenon.

[Comparative analysis of diagnostic scales of acute appendicitis: Alvarado, RIPASA and AIR]. / ARTÍCULO ORIGINAL Análisis comparativo de escalas diagnósticas de apendicitis aguda: Alvarado, RIPASA y AIR.

INTRODUCTION: Acute appendicitis is the most common surgical disease in emergency surgery, however, it remains a diagnostic problem and represents a challenge despite the experience and the different clinical and paraclinical diagnostic methods. OBJECTIVE: To evaluate in a comparative way the scale of Alvarado, AIR and RIPASA to determine which one is best as a diagnostic test of acute appendicitis in our population in order to arrive to an accurate diagnosis in the shortest possible time and cost. METHOD: Observational, prospective, transversal and comparative study of 137 patients to whom the scale of Alvarado, AIR and RIPASA was applied, who entered the emergency service of the Civil Hospital of Culiacán (México) with abdominal pain syndrome suggestive of acute appendicitis. RESULTS: The Alvarado scale presented sensitivity 97.2% and specificity of 27.6%. AIR presented sensitivity of 81.9% and specificity of 89.5%. RIPASA showed the same results as Alvarado. All tests showed diagnostic accuracy above 80. CONCLUSIONS: Alvarado and RIPASA presented good sensitivity, however, AIR is more specific, and has better accuracy for the diagnosis of acute appendicitis, making a better screening and thus reducing unnecessary surgeries. Therefore, it is recommended to use more AIR than Alvarado and RIPASA.

INTRODUCCIÓN: La apendicitis aguda es la enfermedad quirúrgica más común en cirugía de urgencia; sin embargo, sigue siendo un problema diagnóstico y representa un reto a pesar de la experiencia y los diferentes métodos de diagnóstico clínicos y paraclínicos. OBJETIVO: Evaluar en forma comparativa las escalas de Alvarado, AIR y RIPASA para determinar cuál es superior como prueba diagnóstica de apendicitis aguda en nuestra población, llegando a un diagnóstico preciso en el menor tiempo y costo posibles. MÉTODO: Estudio observacional, prospectivo, transversal y comparativo de 137 pacientes a quienes se aplicó las escalas de Alvarado, AIR y RIPASA, que ingresaron al servicio de urgencias del Hospital Civil de Culiacán (México) con síndrome doloroso abdominal sugestivo de apendicitis aguda. RESULTADOS: La escala de Alvarado presentó una sensibilidad del 97.2% y una especificidad del 27.6%. AIR tuvo una sensibilidad del 81.9% y una especificidad del 89.5%. RIPASA arrojó los mismos resultados que Alvarado. Todas las pruebas tuvieron una exactitud diagnóstica por arriba del 80. CONCLUSIONES: Alvarado y RIPASA presentaron buena sensibilidad, mientras que AIR es más específica y tiene mayor exactitud diagnóstica de apendicitis aguda, realizando un mejor tamizaje y permitiendo disminuir las cirugías innecesarias, por lo que se recomienda usar más AIR que Alvarado y RIPASA.

Utilidad de la 18F-FDG PET/TC en la valoración de tumores de la vaina nerviosa / The Value of 18F-FDG PET/TC in the Assessment of Peripheral Nerve Sheath Tumors

La 18F-FDG PET/TC tiene un papel importante en la evaluación de los tumores de la vaina nerviosa periférica, especialmente para determinar la posibilidad de malignidad y el sitio idóneo para la toma de biopsia. Se expone el caso de una mujer de 34 años de edad con diagnóstico de tumor de vaina nerviosa periférica, localizado en el mediastino posterior, que generó síndrome de vena cava superior y síndrome de Horner. Se realizó 18F-FDG PET/TC para hacer el diagnóstico diferencial entre benignidad y malignidad. Se encontró masa heterogénea con áreas hipermetabólicas que alcanzaban un SUVmax (valor de captación estándar máximo) de 8,5, hallazgos que sugerían origen maligno con diferentes grados de diferenciación. La biopsia de los lugares con mayor metabolismo arrojó el resultado de tumor maligno de vaina nerviosa periférica.

18F-FDG PET/CT is a useful imaging modality in the diagnosis and follow-up of peripheral nerve sheath tumors, especially in the assessment of tumor grade and biopsy guidance. The case of a 34-years-old woman diagnosed with peripheral nerve sheath tumor located in the posterior mediastinum that generated superior vena cava syndrome and Horner syndrome is presented. 18F-FDG PET/TC was performed to assess the possibility of malignancy. An 18F-FDG PET/CT was performed to determine whether it was benign or malignant, a heterogeneous mass with hypermetabolic areas with a maximum standardized uptake value (SUVmax) of 8.5 was found, and suggested malignancy with multiple grades of differentiation. A tumor biopsy from the region of higher metabolism was recommended with pathology result of malignant peripheral nerve sheath tumor.

Anillos vasculares, hallazgos por Resonancia Magnética / Vascular rings, Magnetic Resonance findings

Los anillos vasculares son un espectro de patologías en las que el arco aórtico, la arteria pulmonar o la ramificación de los vasos supraaórticos tienen un origen o trayecto anormal y pueden comprimir la tráquea o el esófago, lo cual genera diferentes síntomas, como los respiratorios, que son lo más comunes. Estas patologías pueden estar asociadas a malformaciones cardiacas, del tracto gastrointestinal y en otros sistemas. Se realiza una revisión de la literatura sobre la embriología, epidemiología, clínica y hallazgos imagenológicos en resonancia magnética de los principales anillos vasculares.

Vascular rings are a spectrum of pathologies where the aortic arch, pulmonary artery and/or the supra-aortic vessels have a different origin or an abnormal course; this may or may not produce tracheal and/or esophageal compression. These entities have a variable clinical presentation, with respiratory symptoms being the most common. They are associated with cardiac, gastrointestinal and other system malformations. We reviewed the available literature about the embryology, epidemiology, clinical and Magnetic resonance imaging findings of the most common vascular rings.

An Approach for Learning Expressive Ontologies in Medical Domain.

The access to medical information (journals, blogs, web-pages, dictionaries, and texts) has been increased due to availability of many digital media. In particular, finding an appropriate structure that represents the information contained in texts is not a trivial task. One of the structures for modeling the knowledge are ontologies. An ontology refers to a conceptualization of a specific domain of knowledge. Ontologies are especially useful because they support the exchange and sharing of information as well as reasoning tasks. The usage of ontologies in medicine is mainly focussed in the representation and organization of medical terminologies. Ontology learning techniques have emerged as a set of techniques to get ontologies from unstructured information. This paper describes a new ontology learning approach that consists of a method for the acquisition of concepts and its corresponding taxonomic relations, where also axioms disjointWith and equivalentClass are learned from text without human intervention. The source of knowledge involves files about medical domain. Our approach is divided into two stages, the first part corresponds to discover hierarchical relations and the second part to the axiom extraction. Our automatic ontology learning approach shows better results compared against previous work, giving rise to more expressive ontologies.

[Prevalence of postnatal depression in women attending public hospitals in Durango, Mexico]. / Prevalencia de depresión posnatal en mujeres atendidas en hospitales públicos de Durango, México.

OBJECTIVE: To determine the prevalence of postnatal depression and associated epidemiological features in a population of women from Durango, Mexico. METHODS: Applying a cross-sectional design in public hospitals from Durango, we studied 178 women during their 1 to 13 weeks postpartum. The Edinburg Postnatal Depression Scale was applied and depression was evaluated by using the DSM-IV criteria. In addition, socio-demographic, clinical, and psychosocial data from participants were obtained. RESULTS: Of the 178 women, 58 were depressed (32.6%). The prevalence of depression was significantly higher in women with low level of education, with more than 3 years of living with her partner, and in rural, non-insured women. Multivariate analysis showed that postnatal depression was significantly associated with previous depression, history of postnatal depression, depression, anxiety and stress during pregnancy, stress after pregnancy, trauma, bad relationship with partner, abandonment by partner, unwanted pregnancy, family problems, and living without partner. CONCLUSIONS: The prevalence of postnatal depression in women living in Durango, Mexico, is high. Several socio-demographic, clinical, and psychosocial factors appear to contribute to this condition.