Improving the radiological diagnosis of hepatic artery thrombosis after liver transplantation: Current approaches and future challenges.

Hepatic artery thrombosis (HAT) is a devastating vascular complication following liver transplantation, requiring prompt diagnosis and rapid revascularization treatment to prevent graft loss. At present, imaging modalities such as ultrasound, computed tomography, and magnetic resonance play crucial roles in diagnosing HAT. Although imaging techniques have improved sensitivity and specificity for HAT diagnosis, they have limitations that hinder the timely diagnosis of this complication. In this sense, the emergence of artificial intelligence (AI) presents a transformative opportunity to address these diagnostic limitations. The develo pment of machine learning algorithms and deep neural networks has demon strated the potential to enhance the precision diagnosis of liver transplant com plications, enabling quicker and more accurate detection of HAT. This article examines the current landscape of imaging diagnostic techniques for HAT and explores the emerging role of AI in addressing future challenges in the diagnosis of HAT after liver transplant.

A pulmonary rehabilitation program is an effective strategy to improve forced vital capacity, muscle strength, and functional exercise capacity similarly in adults and older people with post-severe COVID-19 who required mechanical ventilation.

BACKGROUND: It is internationally known that our population is aging. At the same time, some patients with COVID-19, due to their symptoms, required mechanical ventilation (MV) and subsequent pulmonary rehabilitation (PR). This study aimed to compare the effects of a multimodal PR program "ADULT" versus "OLDER" people with COVID-19 who were on MV. METHODS: The intervention consisted of an 8-week hybrid PR program (2x week). Forced vital capacity (FVC) was measured at the beginning and end of PR, upper and lower limb strength was obtained through hand grip strength (HGS) and the sit-to-stand test (STST), respectively, and functional exercise capacity was measured with the 6-minute walking test (6MWT). RESULTS: The main results were an increase in the FVC in the ADULT and OLDER groups (time effect, P = 0.000; η2 = 0.27), an increase in HGS in the ADULT and OLDER groups (time effect, P = 0.000; η2 = 0.52), in the same way, the number of repetitions on the STST increased in the ADULT and OLDER groups (time effect, P = 0.000; η2 = 0.55). Finally, the distance covered on the 6MWT increased in the ADULT and OLDER groups (time effect, P = 0.000; η2 = 0.65). CONCLUSIONS: The PR program is an effective strategy to improve FVC, muscle strength, and functional exercise capacity similarly in adults and older people with post severe COVID-19 who required MV.

Effects of a pulmonary rehabilitation program on pulmonary function, exercise performance, and quality of life in patients with severe COVID-19.

BACKGROUND: Severe coronavirus 2019 disease (COVID-19) causes acute hypoxemic respiratory failure requiring invasive mechanical ventilation (IMV). Once these symptoms are resolved, patients can present systemic deterioration. OBJECTIVE: The two objectives of this study were as follows: to describe the results of a pulmonary rehabilitation program (PRP), which is divided into three groups with different numbers of sessions (12, 24, and 36), and to associate the variables of pulmonary function, exercise performance, and functionality with the number of sessions and functional improvement. DESIGN: Prospective, observational study. METHODS: PRP consisted of aerobic + strength + flexibility exercises under the supervision and individualized into 12, 24, or 36 sessions (12s, 24s, and 36s), depending on the evolution of each patient. At the beginning of the study and immediately after the intervention, forced vital capacity (FVC), maximal inspiratory pressure, 6-minute walk test (6MWT), sit-to-stand test (STS), maximal handgrip strength (HGS), Fatigue Assessment Scale, Post-COVID-19 Functional Status (PCFS), and health-related quality of life (HRQoL) were measured. RESULTS: The proposed PRP demonstrated a positive effect on pulmonary function, exercise performance, and HRQoL, regardless of the number of sessions. A higher score on the PCFS and more days on IMV were associated with the increased likelihood of needing more sessions, whereas more meters on the 6MWT in the initial evaluation was associated with a reduced likelihood of needing more sessions. Finally, more repetitions on the STS and less distance covered on the initial 6MWT were associated with a greater improvement in exercise performance evaluated with the 6MWT. CONCLUSION: Supervised and individualized PRP for patients with severe post-COVID-19 improves pulmonary function, exercise performance, functionality, and quality of life. Functionality, distance covered on the 6MWT, and the days on IMV are central to the scheduling of the number of sessions for these patients.

Learning-oriented motivation: Examining the impact of teaching practices with motivational potential.

This study compares the predictive ability of nine different types of motivational practices on the motivational orientation toward learning. Given the nature of undergraduate studies, identifying the most predictive motivational variables on learning orientation allows us to focus our efforts on those motivational practices to guide students to deploy their cognitive resources by focusing on learning and not only on obtaining good grades. The study included Chilean university students from health (n = 398) and education (n = 365) programs. A Bayesian multiple regression was carried out in both groups. The results show strong evidence of a specific effect of motivational practices on motivational orientation towards learning. Although the impact on motivational orientation toward learning may vary slightly across different fields of study, the primary predictors consistently are practices that emphasize importance and foster autonomy. The effect of utility-focused motivational practices is observed only within the predictive model for the group of health students.

An impact evaluation of conservation investments targeting long-distance migratory species.

We evaluated the impact of a philanthropic program investing in the conservation of sites along the Pacific Americas Flyway, which spans >16,000 km of coastline and is used by millions of shorebirds. Using a quasi-experimental, mixed methods approach, we estimated what would have happened to shorebird populations at 17 wintering sites without the sustained and additional investment they received. We modeled shorebird populations across the entire flyway and at sites with and without investment. Combining shorebird abundance estimates with a land-cover classification model, we used the synthetic control method to create counterfactuals for shorebird trends at the treatment sites. We found no evidence of an overall effect across three outcome variables. Species- and site-level treatment effects were heterogeneous, with a few cases showing evidence of a positive effect, including a site with a high level of overall investment. Results suggest six shorebirds declined across the entire flyway, including at many Latin American sites. However, the percentage of flyway populations present at the sites remained stable, and the percentage at the treatment sites was higher (i.e., investment sites) than at control sites. Multiple mechanisms behind our results are possible, including that investments have yet to mitigate impacts and negative impacts at other sites are driving declines at the treatment sites. A limitation of our evaluation is the sole focus on shorebird abundance and the lack of data that prohibits the inclusion of other outcome variables. Monitoring infrastructure is now in place to design a more robust and a priori shorebird evaluation framework across the entire flyway. With this framework, it will prove easier to prioritize limited dollars to result in the most positive conservation outcomes.

Evaluación del impacto de la inversión para la conservación enfocada en especies migratorias de largo recorrido Resumen Evaluamos el impacto de un programa filantrópico que invierte en la conservación de sitios a lo largo de la Ruta Migratoria Pacífico-Américas, la cual abarca >16,000 km de la línea costera y millones de aves playeras la usan. Estimamos con una estrategia cuasiexperimental y de métodos mixtos lo que habría pasado con las poblaciones de estas aves en 17 sitios invernales sin la inversión adicional y continua que recibieron. Modelamos estas poblaciones en toda la ruta y en sitios con y sin inversión. Combinamos las estimaciones de aves playeras con el modelo de clasificación de la cobertura del suelo y usamos el método de control sintético para crear contrafactuales para las tendencias de las aves playeras en sitios de tratamiento. No encontramos evidencia alguna de un efecto generalizado en las tres variables de los resultados. Los efectos del tratamiento de especies y de sitio fueron heterogéneos, con unos cuantos casos que mostraron evidencia de un efecto positivo, incluido un sitio con un nivel elevado de inversión general. Los resultados sugieren que seis especies de aves playeras declinaron a lo largo de toda la ruta, incluyendo en varios sitios de América Latina. Sin embargo, el porcentaje de poblaciones de la ruta presentes en los sitios permaneció estable y el porcentaje en los sitios de tratamiento (sitios de inversión) fue más elevado que en los sitios control. Muchos mecanismos son posibles detrás de nuestros resultados, incluidas las inversiones que todavía no han mitigado impactos y los impactos negativos en otros sitios que están causando las declinaciones en los sitios de tratamiento. Una limitación en nuestra evaluación es el enfoque único en la abundancia de aves playeras y la falta de datos que impiden la inclusión de otras variables de los resultados. El monitoreo de la infraestructura ahora está en una posición en la que puede diseñar un marco de evaluación más robusto y a priori de las aves playeras a lo largo de toda la ruta. Con este marco, será más fácil priorizar los dólares limitados para que los resultados de conservación sean lo más positivos posible.

GPS tracking analyses reveal finely-tuned shorebird space use and movement patterns throughout the non-breeding season in high-latitude austral intertidal areas.

BACKGROUND: Long-distance migratory birds spend most of their annual cycle in non-breeding areas. During this period birds must meet their daily nutritional needs and acquire additional energy intake to deal with future events of the annual cycle. Therefore, patterns of space use and movement may emerge as an efficient strategy to maintain a trade-off between acquisition and conservation of energy during the non-breeding season. However, there is still a paucity of research addressing this issue, especially in trans-hemispheric migratory birds. METHODS: Using GPS-tracking data and a recently developed continuous-time stochastic process modeling framework, we analyzed fine-scale movements in a non-breeding population of Hudsonian godwits (Limosa haemastica), a gregarious long-distance migratory shorebird. Specifically, we evaluated if these extreme migrants exhibit restricted, shared, and periodic patterns of space use on one of their main non-breeding grounds in southern South America. Finally, via a generalized additive model, we tested if the observed patterns were consistent within a circadian cycle. RESULTS: Overall, godwits showed finely-tuned range-residence and periodic movements (each 24-72 h), being similar between day and night. Remarkably, range-resident individuals segregated spatially into three groups. In contrast, a smaller fraction of godwits displayed unpredictable and irregular movements, adding functional connectivity within the population. CONCLUSIONS: In coastal non-breeding areas where resource availability is highly predictable due to tidal cycles, range-resident strategies during both the day and night are the common pattern in a long-distance shorebird population. Alternative patterns exhibited by a fraction of non-resident godwits provide functional connectivity and suggest that the exploratory tendency may be essential for information acquisition and associated with individual traits. The methodological approach we have used contributes to elucidate how the composition of movement phases operates during the non-breeding season in migratory species and can be replicated in non-migratory species as well. Finally, our results highlight the importance of considering movement as a continuum within the annual cycle.

Ética e integridad académica en la formación doctoral: el caso de los doctorados en educación en las universidades chilenas / Ethics and academic integrity in doctoral training: the case of doctorates in education in Chilean universities / Ética e integridade acadêmica na formação pós-graduada: o caso dos doutorados em educação nas universidades chilenas

El presente artículo analiza, a partir de una revisión documental de planes y programas de curso de los doctorados en Educación activos en Chile, en qué medida y cómo los programas de formación de futuros investigadores en educación doctoral abordan el desafío de integrar la educación ética en su diseño curricular. Mediante un análisis temático de la documentación oficial de los programas se identificaron y analizaron diversos elementos relacionados con ética de la investigación e integridad académica abordados en la formación doctoral, su enfoque prevalente (normativo o de discernimiento ético), su orientación (propositiva o de prevención) y la profundidad con que son tratados esos aspectos. Los resultados muestran que solo un tercio de los actuales programas abordan de manera explícita la formación ética en investigación, y que, en estos casos, su abordaje tiende a subrayar aspectos más formales que de fondo, acotados fundamentalmente al cumplimiento del protocolo de consentimiento informado.

This article analyzes to what extent and how training programs for future researchers in doctoral education address the challenge of integrating ethical training in their curricular design. Based on a documentary review of course plans and postgraduate programs in education active in Chile, the explicit presence of ethical aspects and academic integrity in their training plans was examined. Through a thematic analysis of the official documentation of the programs, we identified and analyzed various elements related to research ethics and academic integrity addressed in doctoral training, their prevalent approach normative or ethical discernment, their orientation proactive or preventive and the depth with which these aspects are treated. The results show that only one-third of the current programs explicitly address ethical training in research and that in these cases, their approach tends to emphasize more formal than substantive aspects, mainly limited to compliance with the informed consent protocol.

O presente artigo analisa, a partir de uma revisão documental de planos e programas de curso dos doutorados em Educação ativos no Chile, em que medida e como os programas de formação de futuros investigadores em educação pós-graduada abordam o desafio de integrar a educação ética em seu plano curricular. Mediante uma análise temática da documentação oficial dos programas se identificaram e analisaram diversos elementos relacionados com ética da investigação e integridade acadêmica abordados na formação pós-graduada, seu enfoque prevalente (normativo ou de discernimento ético), sua orientação (propositiva ou de prevenção) e a profundidade com que são tratados esses aspectos. Os resultados mostram que só um terço dos atuais programas abordam de maneira explícita a formação ética em investigação, e que, nestes casos, sua abordagem tende a ressaltar aspectos mais formais que substanciais, limitados fundamentalmente ao cumprimento do protocolo de consentimento informado.

Use of the speed achieved on the 6MWT for programming aerobic training in patients recovering from severe COVID-19: an observational study.

INTRODUCTION: Patients who suffered severe COVID-19 need pulmonary rehabilitation. Training may be prescribed objectively based on the maximum speed in the six-minute walk test. The objective of this study was to determine the effects of a personalized pulmonary rehabilitation program based on the six-minute walk test speed for post-COVID-19 patients. METHODS: Observational quasi-experimental study. The pulmonary rehabilitation program consisted of 8 weeks of training, twice a week for 60 minutes per session of supervised exercise. Additionally, the patients carried out home respiratory training. Patients were evaluated by exercise test, spirometry and the Fatigue Assessment Scale before and after the eight-week pulmonary rehabilitation program. RESULTS: After the pulmonary rehabilitation program, forced vital capacity increased from 2.47 ± 0.60 to 3.06 ± 0.77 L (p < .001) and the six-minute walk test result increased from 363.50 ± 88.87 to 480.9 ± 59.25 m (p < .001). In fatigue perception, a significant decrease was observed, from 24.92 ± 7.01 to 19.10 ± 7.07 points (p < .01). Isotime evaluation of the Incremental Test and the Continuous Test showed a significant reduction in heart rate, dyspnoea and fatigue. CONCLUSION: The eight-week personalized pulmonary rehabilitation program prescribed on the basis of the six-minute walk test speed improved respiratory function, fatigue perception and the six-minute walk test result in post-COVID-19 patients.KEY MESSAGESCOVID-19 is a multisystem disease with common complications affecting the respiratory, cardiac and musculoskeletal systems.The 6MWT speed-based training plan allowed for increased speed and incline during the eight-week RP program.Aerobic, strength and flexibility training reduced HR, dyspnoea and fatigue in severe post-COVID-19 patients.

Eight Weeks of Supervised Pulmonary Rehabilitation Are Effective in Improving Resting Heart Rate and Heart Rate Recovery in Severe COVID-19 Patient Survivors of Mechanical Ventilation.

Background and Objectives: Patients who survive severe COVID-19 require significant pulmonary rehabilitation. Heart rate (HR) has been used as a safety variable in the evaluation of the results of interventions in patients undergoing pulmonary rehabilitation. The aim of this research was to analyse HR during a pulmonary rehabilitation program in post-severe COVID-19 patients who survived mechanical ventilation (MV). The study includes the initial and final evaluations and aerobic training sessions. Materials and Methods: Twenty patients (58 ± 13 years, 11 men) were trained for 8 weeks. A 6-minute walk test (6 MWT) was performed and, subsequently, a supervised and individualised training plan was created. Resting heart rate (RHR), heart rate recovery (HRR), heart rate at minute 6 (HR6 min) and the product of HR6 min and systolic blood pressure (HR6 minxSBP) were measured at 6 MWT. In addition, HR was measured at each training session. Results: After 8 weeks of pulmonary rehabilitation, patients decreased their RHR from 81.95 ± 9.36 to 73.60 ± 9.82 beats/min (p < 0.001) and significantly increased their HRR from 12.45 ± 10.22 to 20.55 ± 7.33 beats/min (p = 0.005). HR6 min presented a significant relationship with walking speed and walked distance after the pulmonary rehabilitation period (r = 0.555, p = 0.011 and r = 0.613, p = 0.011, respectively). HR6 minxSBP presented a significant relationship with walking speed and walked distance after training (r = 0.538, p = 0.014 and r = 0.568, p = 0.008, respectively). In the pulmonary rehabilitation sessions, a significant decrease in HR was observed at minutes 1, 6 and 15 (p < 0.05) between sessions 1 and 6 and at minute 1 between sessions 1 and 12. Conclusions: Eight weeks of individualised and supervised pulmonary rehabilitation were effective in improving RHR and HRR in COVID-19 patients surviving MV. HR is an easily accessible indicator that could help to monitor the evaluation and development of a pulmonary rehabilitation program in COVID-19 patients who survived MV.

Shoulder Pain in COVID-19 Survivors Following Mechanical Ventilation.

COVID-19 has caused a certain proportion of patients to be hospitalized in intensive care units (ICU) and may cause musculoskeletal and neurological deficits following intubation and mechanical ventilation. The aim of this study was to quantify and describe the presence of shoulder pain in patients released from hospitals after suffering COVID-19. Patients with positive Apley tests were sent to a physiatrist for a clinical evaluation, ultrasound and electromyography (EMG). This evaluation was completed with a pain scale, joint range and shoulder muscle strength evaluations. Of the one-hundred-sixteen patients, seventy eight entered the respiratory rehabilitation program. Twenty patients were sent to the multidisciplinary shoulder team for positive Apley scratch tests. Of these twenty patients, one had only an EMG, ten had only ultrasounds, seven had an EMG and ultrasound and two did not need complementary tests. The twenty patients were sent to the physical therapist, with all presenting pain and diminished joint range and muscle strength in the affected shoulder. In this context, shoulder pain could be associated with the prone position in the ICU. We suggest time control and position change for patients on mechanical ventilation in a prone position with COVID-19.

Growth of Leucoagaricus gongylophorus Möller (Singer) and production of key enzymes in submerged and solid-state cultures with lignocellulosic substrates.

The aim of this study was to characterize the growth of the fungus Leucoagaricus gongylophorus LEU18496, isolated from the fungus garden of the nest of leaf cutter ants Atta mexicana. The fungus garden was cultivated in an artificial laboratory nest and the fungus further grown in submerged (SmC) and solid state (SSC) cultures with sugarcane bagasse, grass or model substrates containing CM-cellulose, xylan or lignin. The CO2 production rate with grass in SmC (Vmax 34.76 mg CO2 Lgas-1 day- 1) was almost four times than SSC (Vmax 9.49 mg CO2 Lgas-1 day- 1), while the production rate obtained in sugarcane bagasse in SmC (Vmax 16.02 mg CO2 Lgas-1 day- 1) was almost three times than that for SSC (Vmax 5.42 mg CO2 Lgas-1 day- 1). In addition, the fungus grew with defined carbon substrates mixtures in SmC, but at different rates, first xylan, followed by CM-cellulose and lignin. Endoglucanase and xylanase activities (U mgprotein-1) were detected in all cultures, the specific activity was higher in the fungus-garden, 5.2 and 1.8; followed by SSC-grass, 1.5 and 0.8, and SSC-bagasse, 0.9 and 0.8, respectively. Laccase activity in the fungus-garden was 44.8 U L- 1 and 10.9 U L- 1 in the SSC-grass. The gongylidia structures observed by environmental scanning electron microscopy were ca. 40 µm and the hyphae width ca. 5 µm. The results show that L. gongylophorus from A. mexicana have promising applications for the treatment of plant residues to release fermentable sugars and the production of high value lignocellulolytic enzymes such as endoglucanase, xylanase or laccases.

Motivation for Critical Thinking in Nursing Students in Chile.

Nursing education includes a constant challenge regarding the competencies that nurses must possess to provide high-quality nursing care. One of these competencies is critical thinking (CT), and motivation for critical thinking (MCT) has been identified as an element necessary to develop CT. Expectancy and value are important components of the MCT. This study aimed to analyze sociodemographic and academic factors related to MCT in Chilean nursing students. This study is an analytical-correlational, cross-sectional study conducted with 478 nursing students in Chile. The data were collected using an online questionnaire. The Critical Thinking Motivation Scale was used to measure MCT. Pearson's square, Chi-square, means comparison test, and binomial logistic regression were used to analyze the data. The expectancy component of the MCT had the lowest scores on the scale. Age was associated with the cost subcomponent (p < .03), and high school was associated with the interest subcomponent (p < .01). Academic factors contributing to MCT were problem-based learning, professor motivation, and the inclusion of MCT in nursing disciplinary subjects. Strategies that improve CT and MCT should be implemented and evaluated periodically from the beginning of a nursing career. Faculty should be trained to motivate students to think critically.

Efecto del componente arbóreo sobre la dinámica de crecimiento y calidad nutricional de una pradera mixta en trópico alto / Effect of tree component on the growth dynamics and nutritional quality of a mixed grassland in the high tropic

Resumen Los sistemas ganaderos se basan en el monocultivo de gramíneas. El pastoreo comúnmente no tiene en cuenta la fisiología de las especies, lo que afecta la persistencia y calidad del forraje. Los sistemas silvopastoriles favorecen la producción y calidad del forraje. Por eso es importante conocer la dinámica de crecimiento de la pastura para determinar el momento óptimo de pastoreo. Con base en esto, el objetivo de esta investigación fue evaluar el efecto de Acacia melanoxilum sobre la producción y calidad nutricional de una pradera mixta en trópico alto. La investigación se desarrolló en el Centro de Investigación y Capacitación "Santa María del Puyón", ubicado en Sopo, Colombia. Se evaluó una pradera de Cenchrus clandestinum y Lolium perenne, en pasturas en callejones se establecieron parcelas bajo y fuera de los árboles, y se evaluó el crecimiento (15, 30, 45 y 60 días) durante nueve meses. Luego se determinaron las propiedades fisicoquímicas del suelo, la altura sin disturbar del pasto, el número de hojas, el índice de área foliar y la producción y calidad de forraje. Después se utilizó un diseño al azar, y se realizó estadística descriptiva y análisis de varianza, mediante el programa Infostat® para el análisis de datos. Bajo los árboles se observó mayor pH, materia orgánica, minerales y capacidad de intercambio catiónico, mayor altura sin disturbar (p = 0,0001), diferencias en producción de forraje verde (p = 0,0128), composición botánica y mayor proteína cruda (p = 0,0061). Los árboles de A. melanoxilum favorecen el crecimiento y la calidad nutricional de praderas mixtas en trópico alto.

Abstract Livestock systems are based on the monoculture of grasses, grazing does not usually take into account the physiology of the species, this affects the persistence and quality of the forage. Silvopastoral systems favor forage production and quality, it is important to know the growth dynamics of the pasture to determine the optimal grazing moment. The objective of this work was to evaluate the effect of Acacia melanoxilum on the production and nutritional quality of a mixed meadow in the high tropics. The research was carried out at the "Santa María del Puyón" Research and Training Center, located in Sopo, Colombia. A meadow of Cenchrus clandestinum and Lolium perenne was evaluated, in alley pastures, plots were established under and outside the trees, the growth was evaluated (15, 30, 45 and 60 days) for nine months. The physicochemical properties of the soil, undisturbed height, number of leaves, leaf area index, production and quality of forage were determined. A random design was used, descriptive statistics and analysis of variance were performed. The Infostat® program was used for data analysis. Under the trees there is a higher ph, organic matter, minerals and cation exchange capacity, higher undisturbed height (p = 0.0001), differences in green forage production (p = 0.0128), botanical composition, and higher protein crude (p = 0.0061). A. Melanoxilum trees favor the growth and nutritional quality of mixed grasslands in the high tropics.

Partially Reversible H2S Adsorption by MFM-300(Sc): Formation of Polysulfides.

The metal-organic framework (MOF)-type MFM-300(Sc) exhibits a combined physisorption and chemisorption capture of H2S, leading to a high uptake (16.55 mmol g-1) associated with high structural stability. The irreversible chemisorbed sulfur species were identified as low-order polysulfide (n = 2) species. The isostructural MFM-300(In) was demonstrated to promote the formation of different polysulfide species, paving the way toward a new methodology to incorporate polysulfides within MOFs for the generation of novel MOF-lithium/sulfur batteries.

Motivación docente por el uso del juego como dispositivo para el aprendizaje / Teacher motivation for using game as a learning device

Resumen Aun cuando el juego ha sido ampliamente reconocido como práctica social y cultural en la que el niño aprende naturalmente, parece más bien estar ausente de las prácticas educativas. En este contexto, el presente trabajo tuvo como objetivo explorar la motivación de los profesores por la utilización del juego en contexto educativo. Para ello, se realizó un estudio en dos etapas. En la primera fueron encuestados 221 profesores de Educación Básica (primaria) por medio de la Escala de Motivación por el uso del Juego (EMJ), estructurada a partir del modelo motivacional de Expectativa / Valor; y, en una segunda etapa, se indagó acerca de las concepciones que sostienen estos profesores sobre el juego a través de cuatro grupos focales. Los resultados cuantitativos muestran, pese a la alta valoración en los distintos componentes de la motivación, diferencias significativas entre ellos, siendo la dimensión más valorada la de utilidad, mientras que las más descendidas corresponden a los componentes de expectativa y costo. Estos resultados son consistentes con los discursos de los profesores, en los que emergen el costo de tiempo que lleva la implementación del juego y la falta de conocimientos para esa implementación como los factores gravitantes para su inclusión efectiva en aula. Adicionalmente, se destaca una concepción de juego vaga e inespecífica, que, junto con los elementos anteriores, llama a formar de manera explícita a los futuros profesores en el uso e incorporación del juego como recurso educativo.

Abstract Even though play has been widely recognized as a social and cultural practice where children naturally learn, evidence shows that international school practices have tended to reduce spaces for play, relegating it to nearly sporadic levels. Teaching practices in initial education have become increasingly scholastic; despite being recognized as a foundational principle, play has been left to the side of central learning activities, which may affect the development of children. For Chile, a country where standardized assessments have permeated the entire educational system, research has reported a schema of classes centered on adulthood that progressively structure and stiffen classroom activities. Play makes its appearance only as an instructional resource (instructional play), and does so with no measurable certainty of its effectiveness on impacting learning. Given such a gap in the literature regarding how teachers understand play-based education and their motivations toward implementing it at school, this work aimed to explore teacher motivations toward game-based learning in educational contexts under a mixed-methods sequential design. The first stage of the research design surveyed 221 primary education teachers (87.8 % women; average, 29.05 years ± SD 8.74; average teaching experience, 3.67 years ± SD 6.15) with the Motivation Scale for the use of educational games (Muñoz & Valenzuela, 2014) based on the Expectancy Value motivational theory. In the second stage, four focus groups were formed to inquire about the conceptions that these teachers hold regarding play in school settings. Focus group participants were, in total, 29 currently-active primary education teachers (6 men, and 23 women; average age, 41 years ± SD 11.16). Quantitative results show high valuation for different components of motivation, though with significant differences. The most valued dimension corresponded to utility, while the least were expectancy and cost components. No differences were observed by sex or by years of professional experience. These results are consistent with teacher self-reports, who indicate that time, cost, and lack of knowledge in implementing games are inhibiting factors for effective inclusion in the classroom. Moreover, teachers tended not to recognize themselves as players, or engage in play with students; rather, they believe their function is to observe and monitor to maintain order. Within costs, teachers also included loss of control in the classroom as a relevant element: the freedom (or even chaos) that classroom play can lead to is seen as a threat to the teacher. Additionally, teachers have a vague, non-specific -or even idealized- conception of games. They may see play as a series of classroom activities that are decidedly not within educational play; or, even if characterizing games as spontaneous, voluntary, dynamic, and entertaining activities, do not recognize these attributes when placing games in educational contexts. Indeed, games are seen as tools rather than a methodology in itself. Some also idealize play from "the way things used to be", arguing that children no longer know how to play and blaming new technologies as responsible for this "lack of play" in present childhood. This background highlights the need for explicit evidence-based training of future teachers in the use and incorporation of games as an educational resource.

Academic Engagement in Preservice Teachers: Motivational Variables for a Chilean sample / Compromiso académico en futuros profesores: variables motivacionales en una muestra chilena

Abstract This quantitative study examines how pre-service teachers' personal motivations are related to engagement. Subjects were pre-service teachers (n=764) enrolled in nine Chilean universities. Multiple linear regression analysis and path analysis were conducted. Controlling for demographic and academic variables, we show a motivational variables model that significantly predicts engagement. Results indicate strong, positive relationships between engagement and expectancy/value components of motivation for professional training, task value of motivation for academic reading, and intellectual curiosity. Although weaker predictors of engagement, motivation to become a teacher and motivation to teach were still statistically significant and mediated other variables. Overall, the model shows good fit. The results of the present study call for, at least within the Chilean context, the careful consideration that "motivation to become a teacher" or "motivation to teach" may not be enough to explain the teacher training engagement.

Resumen Este estudio cuantitativo examina la relación entre diversas variables motivacionales y el compromiso académico en futuros docentes. Los participantes correspondieron a futuros profesores (n=764) de nueve universidades chilenas. Se realizaron análisis de regresión lineal múltiple y análisis de ruta. Se controlaron las variables demográficas y académicas y se propuso un modelo causal con variables motivacionales que predicen significativamente el compromiso académico. Los resultados muestran una relación fuerte y positiva entre el compromiso y los componentes de expectativa / valor de la motivación para la formación profesional, el valor de la tarea para la lectura académica y la curiosidad intelectual. Aunque las variables motivación para llegar a ser profesor y la motivación por enseñar resultaron predictores débiles del compromiso, fueron estadísticamente significativas y mediaron otras variables motivacionales. En general, el modelo muestra un buen ajuste. En conclusión, los resultados del presente estudio alertan de que, al menos dentro del contexto chileno, la consideración de las variables "motivación para convertirse en maestro" o "motivación por enseñar" pueden no ser suficientes para explicar el compromiso académico durante la formación inicial de los docentes.

La estrategia de vivienda saludable, una intervención en la población rural / The healthy housing strategy, an intervention in the rural population

Introducción: La estrategia de vivienda saludable fue aplicada en diversas comunidades con resultados positivos en el logro de entornos saludables. La estrategia, aplicada a través de una metodología educativa, favorece el empoderamiento y la toma de decisiones relacionadas con los conocimientos, actitudes y prácticas de las familias. Las localidades en el sector rural cuentan con viviendas de construcción precaria, en las que no se han tenido en cuenta para su edificación los factores internos y externos que influyen directamente en la salud de las familias. Objetivo: Determinar el efecto de una intervención educativa, que está enmarcada en la estrategia de vivienda saludable, en los conocimientos, actitudes y prácticas de las familias de una localidad rural de la ciudad de Bucaramanga. Métodos: Se efectuó un estudio cuasi-experimental a través de una intervención educativa, casa a casa. Se evaluaron al principio y al final de su aplicación los conocimientos, actitudes y prácticas de las familias. La muestra estuvo conformada por 31 viviendas rurales. Se tuvo como base metodológica el contenido teórico propuesto en la estrategia de vivienda saludable de la Organización Panamericana de la Salud. Resultados: De los 6 componentes de la estrategia, se lograron cambios significativos en 5 de los 31 ítems evaluados. Conclusión: La estrategia de vivienda saludable, desarrollada a través de la intervención educativa, demuestra ser una herramienta útil en la mejora de prácticas y costumbres sanitarias en la población(AU)

Introduction: The healthy housing strategy was applied in different communities with positive results in the achievement of healthy environments. The strategy, applied through an educational methodology, favors the empowerment and decision-making related to the knowledge, attitudes and family practices. The towns in the rural sector have houses with precarious constructions, in which have not been taken into account for their building the internal and external factors that directly affect the health of families. Objective: To determine the effect of an educational intervention that is framed in the healthy housing strategy, in the knowledge, attitudes and practices of families in a rural town of Bucaramanga city. Methods: It was performed a quasi-experimental study through an educational intervention house to house. Knowledge, attitudes and practices of families were evaluated at the beginning and at the end of the application. The sample consisted of 31 rural homes. It had as a methodological basis the theoretical content proposed in the healthy housing strategy of the Pan American Health Organization. Results: Of the 6 components of the strategy, there were significant changes in 5 of the 31 items evaluated. Conclusion: The healthy housing strategy developed through the educational intervention proves to be a useful tool in improving health practices and customs in the population(AU)

Respiratory mechanics in infants with severe bronchiolitis on controlled mechanical ventilation.

BACKGROUND: Analysis of respiratory mechanics during mechanical ventilation (MV) is able to estimate resistive, elastic and inertial components of the working pressure of the respiratory system. Our aim was to discriminate the components of the working pressure of the respiratory system in infants on MV with severe bronchiolitis admitted to two PICU's. METHODS: Infants younger than 1 year old with acute respiratory failure caused by severe bronchiolitis underwent neuromuscular blockade, tracheal intubation and volume controlled MV. Shortly after intubation studies of pulmonary mechanics were performed using inspiratory and expiratory breath hold. The maximum inspiratory and expiratory flow (QI and QE) as well as peak inspiratory (PIP), plateau (PPL) and total expiratory pressures (tPEEP) were measured. Inspiratory and expiratory resistances (RawI and RawE) and Time Constants (KTI and KTE) were calculated. RESULTS: We included 16 patients, of median age 2.5 (1-5.8) months. Bronchiolitis due to respiratory syncytial virus was the main etiology (93.8%) and 31.3% had comorbidities. Measured respiratory pressures were PIP 29 (26-31), PPL 24 (20-26), tPEEP 9 [8-11] cmH2O. Elastic component of the working pressure was significantly higher than resistive and both higher than threshold (tPEEP - PEEP) (P < 0.01). QI was significantly lower than QE [5 (4.27-6.75) v/s 16.5 (12-23.8) L/min. RawI and RawE were 38.8 (32-53) and 40.5 (22-55) cmH2O/L/s; KTI and KTE [0.18 (0.12-0.30) v/s 0.18 (0.13-0.22) s], and KTI:KTE ratio was 1:1.04 (1:0.59-1.42). CONCLUSIONS: Analysis of respiratory mechanics of infants with severe bronchiolitis receiving MV shows that the elastic component of the working pressure of the respiratory system is the most important. The elastic and resistive components in conjunction with flow profile are characteristic of restrictive diseases. A better understanding of lung mechanics in this group of patients may lead to change the traditional ventilatory approach to severe bronchiolitis.