Manejo clínico de la apoplejía en macroadenoma hipofisario no funcionante durante el embarazo: Reporte de un caso

La apoplejía hipofisaria es un evento infrecuente, especialmente en el embarazo, con pocos casos reportados en la literatura. Se presenta secundario a infartos hemorrágicos por cambios vasculares en un tumor hipofisario. Se puede manifestar con cambios hormonales cuando es secundario a tumores funcionantes o con síntomas neurológicos cuando ejerce efecto de masa en el caso de los tumores no funcionantes. El diagnóstico es por sospecha clínica, principalmente ante síntomas que sugieren efecto masa con compromiso neurológico y visual. Estudios como pruebas de función hormonal y resonancia magnética del cerebro son herramientas para confirmar la patología. Se describe el caso de una paciente de 30 años con embarazo de 28 semanas que presentó cefalea asociado a síntomas visuales que progresaron durante la gestación, con diagnóstico de apoplejía hipofisaria se presenta el abordaje clínico y opciones de manejo que buscaron preservar la viabilidad fetal e integridad materna.  (provisto por Infomedic International)

Pituitary apoplexy is a rare event, especially in pregnancy, with few cases reported in the literature. It occurs secondary to hemorrhagic infarcts due to vascular changes in a pituitary tumor. It may manifest with hormonal changes when secondary to functioning tumors or with neurological symptoms when it exerts mass effect in the case of non-functioning tumors. The diagnosis is based on clinical suspicion, mainly in the presence of symptoms suggesting mass effect with neurological and visual involvement. Studies such as hormone function tests and brain MRI are tools to confirm the pathology. We describe the case of a 30-year-old patient with a 28-week pregnancy who presented headache associated with visual symptoms that progressed during gestation, with a diagnosis of pituitary apoplexy, the clinical approach and management options that sought to preserve fetal viability and maternal integrity are presented. (provided by Infomedic International)

Technical Implications of the Chicken Embryo Chorioallantoic Membrane Assay to Elucidate Neuroblastoma Biology.

The chorioallantoic membrane (CAM) can be used as a valuable research tool to examine tumors. The CAM can be used to investigate processes such as migration, invasion, and angiogenesis and to assess novel antitumor drugs. The CAM can be used to establish tumors in a straightforward, rapid, and cost-effective manner via xenotransplantation of cells or tumor tissues with reproducible results; furthermore, the use of the CAM adheres to the three "R" principle, i.e., replace, reduce, and refine. To achieve successful tumor establishment and survival, several technical aspects should be taken into consideration. The complexity and heterogeneity of diseases including neuroblastoma and cancers in general and their impact on human health highlight the importance of preclinical models that help us describe tumor-specific biological processes. These models will not only help in understanding tumor biology, but also allow clinicians to explore therapeutic alternatives that will improve current treatment strategies. In this review, we summarize the technical characteristics as well as the main findings regarding the use of this model to study neuroblastoma for angiogenesis, metastasis, drug sensitivity, and drug resistance.

Normal development of the heart: a review of new findings.

Development and formation of the heart, the central organ of the circulatory system in vertebrates, starts early during embryonic development (second week), reaching maturity during the first few postnatal months. Cardiogenesis is a highly complex process that requires the active and orderly participation of different cardiac and non-cardiac cell populations. Thus, this process is sensitive to errors that may trigger a variety of heart-development defects, called congenital heart defects, which have a worldwide incidence of 8-10/1000 live births. A good understanding of normal cardiogenesis is required for better diagnosis and treatment of congenital heart diseases. This article reviews normal cardiogenesis by comparing information from classic studies with more recent findings. Information from descriptive anatomical studies of histological sections and selective in vivo marking of chicken embryos were emphasized. In addition, the discovery of heart fields has fueled the investigation of cardiogenic events that were believed to be understood and has contributed to proposals for new models of heart development.

El corazón, órgano central del aparato circulatorio de los vertebrados, comienza a formarse muy temprano en el desarrollo embrionario (segunda semana de gestación) y alcanza su forma madura durante los primeros meses posteriores al nacimiento. La cardiogénesis se caracteriza por ser un proceso altamente complejo, dependiente de la participación activa y ordenada de diferentes poblaciones celulares cardiacas y no cardiacas. Lo anterior hace que este proceso sea sensible a errores que pueden desencadenar una variedad de defectos del desarrollo cardiaco, llamados cardiopatías congénitas, con una incidencia mundial de 8 a 10/1000 nacidos vivos. Para mejorar el diagnóstico y el tratamiento de las cardiopatías congénitas es necesario comprender adecuadamente los eventos implicados en la cardiogénesis normal. En este artículo se revisa el desarrollo cardiaco normal, contrastando la información de los estudios clásicos con la de hallazgos recientes. Se hace hincapié en la información obtenida de los estudios de anatomía descriptiva de cortes histológicos y marcaje selectivo in vivo en embriones de pollo. Adicionalmente, el descubrimiento de los campos cardiogénicos ha estimulado la investigación de eventos cardiogénicos que se creían comprendidos, contribuyendo con propuestas de nuevos modelos del desarrollo del corazón.

Normal development of the heart: a review of new findings / Desarrollo normal del corazón: revisión de nuevos hallazgos

Abstract Development and formation of the heart, the central organ of the circulatory system in vertebrates, starts early during embryonic development (second week), reaching maturity during the first few postnatal months. Cardiogenesis is a highly complex process that requires the active and orderly participation of different cardiac and non-cardiac cell populations. Thus, this process is sensitive to errors that may trigger a variety of heart-development defects, called congenital heart defects, which have a worldwide incidence of 8-10/1000 live births. A good understanding of normal cardiogenesis is required for better diagnosis and treatment of congenital heart diseases. This article reviews normal cardiogenesis by comparing information from classic studies with more recent findings. Information from descriptive anatomical studies of histological sections and selective in vivo marking of chicken embryos were emphasized. In addition, the discovery of heart fields has fueled the investigation of cardiogenic events that were believed to be understood and has contributed to proposals for new models of heart development.

Resumen El corazón, órgano central del aparato circulatorio de los vertebrados, comienza a formarse muy temprano en el desarrollo embrionario (segunda semana de gestación) y alcanza su forma madura durante los primeros meses posteriores al nacimiento. La cardiogénesis se caracteriza por ser un proceso altamente complejo, dependiente de la participación activa y ordenada de diferentes poblaciones celulares cardiacas y no cardiacas. Lo anterior hace que este proceso sea sensible a errores que pueden desencadenar una variedad de defectos del desarrollo cardiaco, llamados cardiopatías congénitas, con una incidencia mundial de 8 a 10/1000 nacidos vivos. Para mejorar el diagnóstico y el tratamiento de las cardiopatías congénitas es necesario comprender adecuadamente los eventos implicados en la cardiogénesis normal. En este artículo se revisa el desarrollo cardiaco normal, contrastando la información de los estudios clásicos con la de hallazgos recientes. Se hace hincapié en la información obtenida de los estudios de anatomía descriptiva de cortes histológicos y marcaje selectivo in vivo en embriones de pollo. Adicionalmente, el descubrimiento de los campos cardiogénicos ha estimulado la investigación de eventos cardiogénicos que se creían comprendidos, contribuyendo con propuestas de nuevos modelos del desarrollo del corazón.

Embryonic Hyperglycemia Disrupts Myocardial Growth, Morphological Development, and Cellular Organization: An In Vivo Experimental Study.

Hyperglycemia during gestation can disrupt fetal heart development and increase postnatal cardiovascular disease risk. It is therefore imperative to identify early biomarkers of hyperglycemia during gestation-induced fetal heart damage and elucidate the underlying molecular pathomechanisms. Clinical investigations of diabetic adults with heart dysfunction and transgenic mouse studies have revealed that overexpression or increased expression of TNNI3K, a heart-specific kinase that binds troponin cardiac I, may contribute to abnormal cardiac remodeling, ventricular hypertrophy, and heart failure. Optimal heart function also depends on the precise organization of contractile and excitable tissues conferred by intercellular occlusive, adherent, and communicating junctions. The current study evaluated changes in embryonic heart development and the expression levels of sarcomeric proteins (troponin I, desmin, and TNNI3K), junctional proteins, glucose transporter-1, and Ki-67 under fetal hyperglycemia. Stage 22HH Gallus domesticus embryos were randomly divided into two groups: a hyperglycemia (HG) group, in which individual embryos were injected with 30 mmol/L glucose solution every 24 h for 10 days, and a no-treatment (NT) control group, in which individual embryos were injected with physiological saline every 24 h for 10 days (stage 36HH). Embryonic blood glucose, height, and weight, as well as heart size, were measured periodically during treatment, followed by histopathological analysis and estimation of sarcomeric and junctional protein expression by western blotting and immunostaining. Hyperglycemic embryos demonstrated delayed heart maturation, with histopathological analysis revealing reduced left and right ventricular wall thickness (-39% and -35% vs. NT). Immunoexpression levels of TNNI3K and troponin 1 increased (by 37% and 39%, respectively), and desmin immunofluorescence reduced (by 23%). Embryo-fetal hyperglycemia may trigger an increase in the expression levels of TNNI3K and troponin I, as well as dysfunction of occlusive and adherent junctions, ultimately inducing abnormal cardiac remodeling.

Stem-Loop Structures in Iron-Regulated mRNAs of Giardia duodenalis.

Giardia duodenalis is a significant cause of waterborne and foodborne infections, day-care center outbreaks, and traveler's diarrhea worldwide. In protozoa such as Trichomonas vaginalis and Entamoeba histolytica, iron affects the growth, pathogenicity mechanisms, and expression of virulence genes. One of the proposed iron regulatory mechanisms is at the post-transcriptional level through an IRE/IRP-like (iron responsive element/iron regulatory protein) system. Recently, the expression of many putative giardial virulence factors in the free-iron levels has been reported in subsequent RNAseq experiments; however, the iron regulatory mechanism remains unknown. Thus, this work aimed to determine the effects of iron on the growth, gene expression, and presence of IRE-like structures in G. duodenalis. First, the parasite's growth kinetics at different iron concentrations were studied, and the cell viability was determined. It was observed that the parasite can adapt to an iron range from 7.7 to 500 µM; however, in conditions without iron, it is unable to survive in the culture medium. Additionally, the iron modulation of three genes was determined by RT-PCR assays. The results suggested that Actin, glucosamine-6-phosphate deaminase, and cytochrome b5 mRNA were down-regulated by iron. To investigate the presence of IRE-like structures, in silico analyses were performed for different mRNAs from the Giardia genome database. The Zuker mfold v2.4 web server and theoretical analysis were used to predict the secondary structures of the 91 mRNAs analyzed. Interestingly, the iron-induced downregulation of the genes analyzed corresponds to the location of the stem-loop structures found in their UTR regions. In conclusion, iron modulates the growth and expression of specific genes, likely due to the presence of IRE-like structures in G. duodenalis mRNAs.

Human Heart Morphogenesis: A New Vision Based on In Vivo Labeling and Cell Tracking.

Despite the extensive information available on the different genetic, epigenetic, and molecular features of cardiogenesis, the origin of congenital heart defects remains unknown. Most genetic and molecular studies have been conducted outside the context of the progressive anatomical and histological changes in the embryonic heart, which is one of the reasons for the limited knowledge of the origins of congenital heart diseases. We integrated the findings of descriptive studies on human embryos and experimental studies on chick, rat, and mouse embryos. This research is based on the new dynamic concept of heart development and the existence of two heart fields. The first field corresponds to the straight heart tube, into which splanchnic mesodermal cells from the second heart field are gradually recruited. The overall aim was to create a new vision for the analysis, diagnosis, and regionalized classification of congenital defects of the heart and great arteries. In addition to highlighting the importance of genetic factors in the development of congenital heart disease, this study provides new insights into the composition of the straight heart tube, the processes of twisting and folding, and the fate of the conus in the development of the right ventricle and its outflow tract. The new vision, based on in vivo labeling and cell tracking and enhanced by models such as gastruloids and organoids, has contributed to a better understanding of important errors in cardiac morphogenesis, which may lead to several congenital heart diseases.

Confirmation of the presence of Rickettsia felis infecting Ornithodoros puertoricensis in Mexico.

Soft ticks are neglected competent vectors of a wide range of pathogenic microorganisms, among which bacteria of the genera Rickettsia and Borrelia stand out. In Mexico, previous studies have shown the presence of a member of the Ornithodoros talaje complex in the Virginia opossum (Didelphis virginiana Didelphimorphia: Didelphidae Kerr) from southeastern Mexico. However, its specific identification has not been achieved. Two D. virginiana were treated in a private clinic during the period of April-May 2022. Tick larvae were manually removed, DNA extraction was performed, and some genes from various bacterial and parasitic pathogens were amplified and sequenced. A total of 96 larvae were recovered, which were morphologically identified as Ornithodoros puertoricensis (Ixodida: Argasidae Fox); the 16 S sequences showed a similarity of 96.79%-99.51% with sequences of O. puertoricensis from Panama and Colombia. The presence of Rickettsia felis (Rickettsiales: Rickettsiaceae Bouyer et al.) was detected in 15 specimens from one host. The soft tick O. puertoricensis is recorded for the first time as an ectoparasite of the Virginia opossum in America and represents the second report for this soft tick in Mexico since 1963. This represents the most northern record of this tick species in its geographic distribution and brings a new soft tick-Rickettsia association.

Factores etiológicos de abscesos periodontales: Una patología emergente. Informe de tres casos / Etiological factors of periodontal abscesses: an emerging pathology. A three-case report

Introducción: La presencia de abscesos periodontales es la tercera emergencia dental más frecuente (6%-14%). Objetivo: Reportar información sobre diferentes factores etiológicos de absceso periodontal en tres pacientes. Descripción de casos: Primer caso, mujer de 52 años quien acudió a consulta por sangrado espontáneo, al examen clínico se evidenció sangrado al sondaje (SS), presencia de bolsas periodontales (BP) y cálculos (C); como tratamiento se realizó raspado y alisado radicular (RAR), complementado con detoxificación con tetraciclina y tratamiento farmacológico posoperatorio. Segundo caso, hombre de 27 años quien acudió a consulta por agrandamiento de encía, se observó (SS), y (BP); se retiró la lesión y se realizó (RAR). Tercer caso, hombre de 21 años quien acudió a consulta de control, al examen clínico se evidenció presencia de cálculos en órganos dentarios y bolsas periodontales en órganos dentarios 16-17; se utilizó (RAR) complementado con detoxificación con tetraciclina y tratamiento farmacológico posoperatorio. Conclusión: La etiología del absceso periodontal en el primer y último caso se basó en la falta de profundidad durante el raspado y alisado radicular, y en el segundo estuvo relacionado a impactación de alimentos. El identificar la etiología permite determinar diagnóstico, pronóstico y tratamiento ideal.

Introduction: Periodontal abscesses are the third most frequent dental emergency (6%-14%). Objective: To describe different etiological factors of periodontal abscesses in three patients. Case description: The first case was a 52-year-old woman who sought treatment due to spontaneous bleeding. During the examination, she revealed bleeding on probing (BP), presence of periodontal pockets (PP), and calculi (C). Scaling and root planning (SRP) was performed as treatment, which was complemented with detoxification with tetracycline and postoperative pharmacological treatment. The second case was a 27-year-old man who came to the clinic due to gum enlargement and showed BP and PP. The lesion was treated and SRP was performed. Finally, the third patient was a 21-year-old male who sought a follow-up consultation. The clinical examination showed the presence of dental calculi and periodontal pockets in teeth 16 and 17. SRP complemented with detoxification with tetracycline and postoperative pharmacology were used as treatments. Conclusion: The etiology of the periodontal abscesses in the first and third cases was based on the lack of depth during root scaling and planning. The cause in the second case was effects of food. Identifying this etiology is useful to achieve proper diagnosis, prognosis and treatment of periodontal abscesses.

Functional gastrointestinal disorders in children: agreement between Rome III and Rome IV diagnoses.

To evaluate the agreement between the Rome III and Rome IV criteria in diagnosing pediatric functional gastrointestinal disorders (FGIDs), we conducted a prospective cohort study in a public school in Cali, Colombia. Children and adolescents between 11 and 18 years of age were given the Spanish version of the Questionnaire on Pediatric Functional Gastrointestinal Disorders Rome III version on day 0 and Rome IV version on day 2 (48 h later). The study protocol was completed by 135 children. Thirty-nine (28.9%) children were excluded because of not following the instructions of the questionnaire. The final analysis included data of 96 children (mean 15.2 years old, SD ± 1.7, 54% girls). Less children fulfilled the criteria for an FGID according to Rome IV compared to Rome III (40.6% vs 29.2%, p=0.063) resulting in a minimal agreement between the two criteria in diagnosing an FGID (kappa 0.34, agreement of 70%). The prevalence of functional constipation according to Rome IV was significantly lower compared to Rome III (13.5% vs 31.3%, p<0.001), whereas functional dyspepsia had a higher prevalence according to Rome IV than Rome III (11.5% vs 0%).Conclusion: We found an overall minimal agreement in diagnosing FGIDs according to Rome III and Rome IV criteria. This may be partly explained by the differences in diagnostic criteria. However, limitations with the use of questionnaires to measure prevalence have to be taken into account. What is Known: • The Rome IV criteria replaced the previous Rome III criteria providing updated criteria to diagnose functional gastrointestinal disorders (FGIDs). • Differences found between Rome IV and historic Rome III FGID prevalence may have been affected by changes in prevalence over time or differences in sample characteristics. What is New: • We found a minimal agreement between Rome III and Rome IV FGID diagnosis, especially in the diagnoses of functional constipation, irritable bowel syndrome, and functional dyspepsia. • The minimal agreement may be partly explained by changes in diagnostic criteria, but limitations with the use of questionnaires to measure prevalence have to be taken into account.

Análisis de los métodos de detección de lesiones orales potencialmente malignas. Revisión sistemática tipo paraguas / Analysis of the detection methods for potentially malignant oral lesions. An umbrella systematic review

Resumen Propósito: determinar la efectividad de detección de lesiones orales potencialmente malignas de cuatro métodos por medio de revisión sistemática tipo paraguas. Fuente de los datos: la búsqueda fue realizada con bases de datos Pubmed y EBSCOhost. Restricción de los años 2013-2018. Estrategia de búsqueda: (early detection of cáncer) AND (mouth neoplasms), (early detection of cáncer) AND (diagnostic techniques and procedures), (mouth neoplasms) AND (diagnostic techniques and procedures). Selección de los estudios: fueron seleccionadas a través de lectura crítica y la lista de chequeo del formato PRISMA, aquellas revisiones sistemáticas cuyo objetivo sea evaluar la efectividad de al menos uno de los métodos de detección de lesiones orales potencialmente malignas, seis estudios cumplieron con los criterios de inclusión. Extracción de datos: mediante la realización de lectura crítica de las revisiones sistemáticas seleccionadas previamente. Resultado de síntesis de los datos: se determina la efectividad a través de la comparación de las medias de porcentajes de sensibilidad y especificidad. Las medias de sensibilidad y especificidad de Vizilite fueron de 81.31 y 25.4%, de Microlux DL de 82.63 y 69.52%, de azul de toluidina de 82.07 y 66.27% y de citología exfoliativa de 76.77 y 80.87%, respectivamente. Conclusiones: los métodos de detección de lesiones orales premalignas evaluados en el presente estudio requieren mayor respaldo de evidencia científica para validar su efectividad. El método con mayor eficacia es el Microlux/DL, debido a sus altos niveles de sensibilidad y especificidad.

Abstract Objective: to determine the effectiveness of four methods for detecting potentially malignant oral lesions through an umbrella systematic review. Source of data: the search was performed in the PubMed and EBSCOhost databases. Years of search limited to 2013-2018. Search strategy: (early detection of cancer) AND (mouth neoplasms), (early detection of cancer) AND (diagnostic techniques and procedures), (mouth neoplasms) AND (diagnostic techniques and procedures). Study selection: using critical reading and the PRISMA checklist, systematic reviews with the objective of evaluating the effectiveness of at least one of the detection methods for potentially malignant oral lesions were selected; six studies met the inclusion criteria. Data extraction: through critical reading of the previously selected systematic reviews. Results of data synthesis: effectiveness was determined by comparing the mean percentages of sensitivity and specificity. Vizilite's sensitivity and specificity means were 81.31 and 25.4%, Microlux DL's were 82.63 and 69.52%, toluidine blue's were 82.07 and 66.27%, and exfoliative cytology's were 76.77 and 80.87%, respectively. Conclusions: the detection methods for pre-malignant oral lesions evaluated in this study need greater scientific evidence to validate their effectiveness. The method with the greatest effectiveness is Microlux/DL, due to its high levels of sensitivity and specificity.

¿Quiste dentigero o ameloblastoma? Importancia del análisis histológico en el diagnóstico de estas patologías / Dentigerous cyst or ameloblastoma? importance of histological analysis in the diagnosis of these pathologies

El quiste dentígero y el ameloblastoma son patologías con poca sintomatología y características clínicas, las cuales son evidentes cuando las lesiones alcanzan dimensiones mayores y esto sucede cuando llevan un tiempo considerable de evolución, por lo cual son descubiertas generalmente en exámenes radiográficos de rutina. El presente artículo describe los hallazgos histológicos y su correlación clínico-patológica y radiográfica entre el quiste dentígero y el ameloblastoma, lo que permite un diagnóstico y un plan de tratamiento. Se presentan dos casos de pacientes masculinos, de 12 y 15 años, que asisten a consulta a la Facultad de Odontología de la Universidad de Cartagena en Colombia, por presentar tumefacción en zona de sínfisis mandibular y en zona de tercer molar inferior derecho. Se especifican hallazgos clínicos, radiográficos e histológicos. Para llegar a los diagnósticos de quiste dentígero y ameloblastoma se deben tener en cuenta todos los hallazgos del examen clínico y radiográfico, pero debe primar el dictamen del examen histopatológico para determinar un tratamiento adecuado. (AU)

Dentigerous cysts and ameloblastomas present with few symptoms, and clinical characteristics present when lesions reach larger dimensions following a considerable length of evolution, and thus, these lesions are often discovered in routine radiographic examinations. This study describes the histological findings and clinical, pathological, and radiographic correlations between dentigerous cysts and ameloblastomas which aid in diagnosis and treatment planning. Two male patients, aged 12 and 15, were attended at the Faculty of Dentistry of the Cartagena University in Colombia due to swelling at the mandibular symphysis and lower right third molar area. The clinical, radiographic and histological findings are described. Clinical and radiographic findings must be taken into account to diagnose dentigerous cysts and ameloblastomas, with histopathological examination providing the definitive diagnosis and allowing adequate patient management. (AU)

Angiolymphoid hyperplasia: report of an unusual case in the oral cavity / Hiperplasia angiolinfoide: reporte de un caso inusual en cavidad oral

Abstract Angiolymphoid hyperplasia with eosinophilia (ALHE) is a rare inflammatory disease of unknown origin, which may be asymptomatic or produce symptoms like pruritus, pain, or spontaneous bleeding, and which has no sex predilection. The treatment options are cryosurgery, pulsed dye laser, topical tacrolimus, surgery, curettage, and oral retinoids. Below is a report of a clinical case of angiolymphoid hyperplasia with eosinophilia in the oral cavity, as well as the treatment performed. This was a female patient who attended a stomatology and oral surgery clinic due to a localized lesion at the level of the vestibule between dental organs 11 and 12. Clinically, there was a nodular lesion of about 1 cm in diameter, located at the level of attached gingiva; it was asymptomatic on palpation and of unknown etiology. Angiolymphoid hyperplasia is an unusual pathology in the oral cavity; its etiology is unknown, and a definitive diagnosis should be made through histopathological examination and clinical signs.

Resumen La hiperplasia angiolinfoide con eosinofilia (HACE) es una enfermedad rara de origen desconocido, de carácter inflamatorio, que puede ser asintomática o presentarse con prurito, dolor o sangrado espontáneo, sin predilección por género. Las opciones de tratamiento son la criocirugía, el láser de colorante pulsado, el tacrolimus tópico, la cirugía, el curetaje y los retinoides orales. Se reporta un caso clínico de hyperplasia angiolinfoide con eosinofilia en cavidad oral, así como el tratamiento realizado. Paciente de sexo femenino, que acudió a consulta de estomatología y cirugía oral por presentar lesión localizada a nivel de vestíbulo entre órganos dentarios 11 y 12. Clínicamente se observó lesión nodular localizada en encía adherida de aproximadamente 1 cm de diámetro, asintomático a la palpación y de etiología desconocida. La hyperplasia angiolinfoide es una patología inusual en cavidad oral, de etiología desconocida, en la que el diagnóstico definitivo debe hacerse a través del examen histopatológico y los signos clínicos.

The Social Support Networks Scale (SSNS) for Family Caregivers of Children with Cancer: A Psychometric Evaluation.

Currently, information about the psychometric properties of the Social Support Networks Scale (SSNS) for family caregivers of children with cancer is not yet available; therefore, there is no empirical evidence of its validity and reliability to support its use in this population. The aim of this study is to determine a factorial model of the SSNS, estimate its internal consistency reliability, describe its distribution, and check its concurrent validity. A convenience sample of 633 family caregivers of children with cancer hospitalized in a National Institute of Health in Mexico City was collected. The SSNS, a sociodemographic variables questionnaire, and three instruments that evaluated family functioning, quality of life, and resilience were applied. The five-factor model had a poor data fit and lacked discriminant validity. The sample was divided. In a subsample of 316 participants, exploratory factor analysis suggested a four-factor model. When testing the four-factor model through confirmatory factor analysis, religious support was independent of family support, friend support, and lack of support. In the other subsample of 317 participants, the one-factor model for religious support had a good fit, and the correlated three-factor model, with the remaining factors, showed an acceptable fit. Reliability ranged from acceptable (Guttman's λ2 = 0.72) to good (λ2 = 0.88). Socio-family support and its three factors were correlated with family functioning, resilience, and quality of life. Religious support was correlated with four factors of resilience and quality of life. A scale of socio-family support with three factors and an independent scale for religious support are defined from the SSNS, and they showed internal consistency and construct validity.

Adaptación lingüística y psicométrica del Cuestionario de Estilos Atributivos Académicos (EAT-A) / Linguistic and psychometric adaptation of the Academic Attributional Style Questionnaire (EAT-A)

Resumen Antecedentes las atribuciones que los estudiantes hacen de sus resultados académicos pueden impactar en su rendimiento académico. Sin embargo, la medición de las atribuciones en este ámbito con frecuencia carece de evidencias de validez y confiabilidad. Objetivos: analizar la estructura factorial, validez convergente y confiabilidad de la adaptación para estudiantes mexicanos del Cuestionario de Estilos Atributivos Académicos (EAT-A). Método: participaron 557 estudiantes de ambos sexos, entre 15 y 19 años, de la Ciudad de México. Mediante el análisis factorial confirmatorio se sometió a prueba una estructura del EATA con siete factores y otra con cuatro que no distingue las atribuciones de éxito y fracaso. Se analizó la validez convergente, la consistencia interna y la confiabilidad compuesta del instrumento. Resultados: solo la estructura con siete factores presentó ajuste adecuado, con los índices RMSEA = .046; SRMR = .053; CFI = .961; TLI = .952 y χ²/gl = 2.72. El EAT-A muestra evidencias de validez convergente con la motivación de logro y de confiabilidad. Conclusión: El EAT-A se muestra como un instrumento de medida breve y fácil aplicación que dispone de evidencias de validez y estimación de confiabilidad para examinar las atribuciones que los estudiantes hacen de sus calificaciones.

Abstract Background Students' attributions of their grades may affect their academic performance. However, lack of evidence supporting the validity and reliability of the instruments measuring attribution is a major concern. Objective: To analyze the factor structure, convergent validity and reliability of the Academic Attributional Style Questionnaire adapted to Mexican high school students (EAT-A). Method: The sample consisted of 557 Mexico City students of both sexes aged between 15 and 19. Using a confirmatory factor analysis for both success and failure attributions, a 7-factor structure and a 4-factor structure of the EAT-A were tested. The instrument's convergent validity, internal consistency and reliability were examined. Results: Only the 7-factor structure showed adequate fit indices: RMSEA = .046; SRMR = .053; CFI = .961; TLI = .952 and χ²/gl = 2.72. In addition, the EAT-A evidenced convergent validity concerning success and reliability motivation. Conclusion: The EAT-A is a quick- and easyto- administer instrument for measuring students' attributions of their grades in a reliable and valid manner.

El miedo es contagioso: menoscabos por una pandemia / Fear is contagious: impairment of a pandemic

En los últimos meses la población del mundo ha estado sometida por la pandemia de COVID-19 a un reto emocional causado por el riesgo de pérdida de la salud (incluida la muerte) y del riesgo real o potencial de la alteración de la estabilidad socioeconómica personal y global. Por otro lado, los individuos reciben diariamente información de diversa valía en relación a veracidad y oportunismo, lo que los expone a incertidumbre respecto a la toma de decisiones relacionadas con el bienestar o asociadas con aspectos laborales y productivos. Debe observarse que esto está sucediendo con: pacientes, empleados, proveedores y profesionistas en el modelo odontológico. El miedo es la respuesta prevalente que induce este conjunto de estímulos amenazantes, en el que de manera secundaria se manifiestan otros estados emocionales, sentimentales y de conducta. Contrarrestar el miedo en todos los actores del concepto práctica dental debería ser la estrategia en la recuperación de la actividad odontológica en esta nueva realidad, siendo la palabra clave, seguridad; misma que no debe estar representada exclusivamente por la implantación de medidas sanitarias, también de manera muy principal por la comunicación y la estimulación positiva de emociones y sentimientos que alcancen la mente afectiva no sólo de los pacientes, sino también de los miembros del grupo de trabajo ­mente inconsciente­(AU)

In recent months the world's population has been exposed by the pandemic advent of COVID-19 to an emotional challenge caused by the risk of health disturbance, death encompassed, and the real or latent risk of disruption of personal and global socioeconomic steadiness. Individuals on the other hand, receive day-to-day information of varying connotation in relation to truthfulness and opportunism, exposing them to decision-making uncertainty regarding welfare, as well employment and productive subjects. At the dental scheme, this is happening with: patients, employees, providers and professionals themselves. The widespread reaction that brings this myriad of threatening stimuli is fear, where other emotional, sentimental and behavioral expressions, secondarily occur. In this new reality, disparate the fear in all and any participant of the dental practice concept should be the strategy applied for dental activity recovering; being the key word, safety. Concept that should not be represented exclusively by the implementation of sanitary actions and warnings, but in a conspicuous manner by communication of this safety concept and the induction of positive stimuli by means of emotions and feelings that could reach the affective mind of patients, and the working group ­unconscious mind­ (AU)

Propuesta del modelo para control de infecciones en la consulta odontológica ante la pandemia de COVID-19 / Proposal for an infection control protocol in the dental consultation against the COVID-19 pandemic

Catalogada su labor como Servicios de Salud Indispensables, el profesional de la odontología se ha mantenido al pendiente de sus pacientes durante la pandemia de COVID-19, brindando atención de urgencia a quien lo solicita. A su regreso a la práctica típica, el odontólogo encontrará un entorno distinto o NUEVA NORMALIDAD, viéndose obligado a hacer modificaciones clínicas pertinentes y preparar a su equipo de trabajo para continuar brindando atención de calidad con un margen de seguridad amplificado, que de igual manera proteja a pacientes y al equipo de trabajo. Ante la falta de una vacuna que brinde protección y de tratamiento específico contra el SARS-CoV-2 (COVID-19), elevar el nivel de control de infecciones en el consultorio se vuelve ineludible y posiblemente irreversible en el quehacer odontológico cotidiano. En este artículo se propone un Protocolo de Control de Infecciones en la consulta odontológica que permita brindar seguridad en la atención bucal, considerando COVID-19, útil también para control infeccioso de otros patógenos virales o bacterianos (AU)

Considered dentistry as an Indispensable Health Services, during the COVID-19 pandemic the dental professional has been providing mostly emergency care. Upon return to typical dental practice, the dentist will find a different environment or NEW NORMALLY, being forced to make relevant clinical modifications and prepare his team to continue providing quality care with an amplified safety margin, which equally protects patients and dental team. In the absence of an available vaccine that provides protection or a specific treatment against SARSCoV- 2 (COVID-19), raising the level of infection control at the dental office will become unavoidable and possibly irreversible in the future quotidian dental work. This article proposes an Infection Control Protocol for the dental consultation that allows provide safety oral care, considering COVID-19, also useful for other viral or bacterial pathogens control (AU)

A precipitation gradient drives change in macroinvertebrate composition and interactions within bromeliads.

Ecological communities change across spatial and environmental gradients due to (i) changes in species composition, (ii) changes in the frequency or strength of interactions or (iii) changes in the presence of the interactions. Here we use the communities of aquatic invertebrates inhabiting clusters of bromeliad phytotelms along the Brazilian coast as a model system for examining variation in multi-trophic communities. We first document the variation in the species pools of sites across a geographical climate gradient. Using the same sites, we also explored the geographic variation in species interaction strength using a Markov network approach. We found that community composition differed along a gradient of water volume within bromeliads due to the spatial turnover of some species. From the Markov network analysis, we found that the interactions of certain predators differed due to differences in bromeliad water volume. Overall, this study illustrates how a multi-trophic community can change across an environmental gradient through changes in both species and their interactions.