Automated test apparatus for bench-testing the magnetic field homogeneity of NMR transceiver coils.

We describe an automated hands-off bench testing method for measuring the magnetic field profile of transceiver coils for nuclear magnetic resonance (NMR). The scattering parameter (S-parameter) data is measured using a portable network analyzer, and the results are automatically exported to a computer for plotting and viewing. This assay dramatically reduces the time needed to measure the magnetic field (B1) homogeneity profile of a transceiver coil while also improving accuracy relative to manual operation. Here, we demonstrate the method on a saddle coil of a solution-state NMR probe in comparison to profiles obtained using NMR spectroscopy measurements. We also measure the axial and radial homogeneity of a variable-pitch solenoid.

The Acute Optic Neuritis Network (ACON): Study protocol of a non-interventional prospective multicenter study on diagnosis and treatment of acute optic neuritis.

Optic neuritis (ON) often occurs at the presentation of multiple sclerosis (MS), neuromyelitis optica spectrum disorders (NMOSD), and myelin oligodendrocyte glycoprotein (MOG) antibody-associated disease (MOGAD). The recommended treatment of high-dose corticosteroids for ON is based on a North American study population, which did not address treatment timing or antibody serostatus. The Acute Optic Neuritis Network (ACON) presents a global, prospective, observational study protocol primarily designed to investigate the effect of time to high-dose corticosteroid treatment on 6-month visual outcomes in ON. Patients presenting within 30 days of the inaugural ON will be enrolled. For the primary analysis, patients will subsequently be assigned into the MS-ON group, the aquapotin-4-IgG positive ON (AQP4-IgG+ON) group or the MOG-IgG positive ON (MOG-IgG+ON) group and then further sub-stratified according to the number of days from the onset of visual loss to high-dose corticosteroids (days-to-Rx). The primary outcome measure will be high-contrast best-corrected visual acuity (HC-BCVA) at 6 months. In addition, multimodal data will be collected in subjects with any ON (CIS-ON, MS-ON, AQP4-IgG+ON or MOG-IgG+ON, and seronegative non-MS-ON), excluding infectious and granulomatous ON. Secondary outcomes include low-contrast best-corrected visual acuity (LC-BCVA), optical coherence tomography (OCT), magnetic resonance imaging (MRI) measurements, serum and cerebrospinal fluid (CSF) biomarkers (AQP4-IgG and MOG-IgG levels, neurofilament, and glial fibrillary protein), and patient reported outcome measures (headache, visual function in daily routine, depression, and quality of life questionnaires) at presentation at 6-month and 12-month follow-up visits. Data will be collected from 28 academic hospitals from Africa, Asia, the Middle East, Europe, North America, South America, and Australia. Planned recruitment consists of 100 MS-ON, 50 AQP4-IgG+ON, and 50 MOG-IgG+ON. This prospective, multimodal data collection will assess the potential value of early high-dose corticosteroid treatment, investigate the interrelations between functional impairments and structural changes, and evaluate the diagnostic yield of laboratory biomarkers. This analysis has the ability to substantially improve treatment strategies and the accuracy of diagnostic stratification in acute demyelinating ON. Trial registration: ClinicalTrials.gov, identifier: NCT05605951.

Geographical analysis of seroprevalence of Ehrlichia spp., Anaplasma spp., Borrelia burgdorferi and Dirofilaria immitis, in clinics and dog shelters in different Mexican states.

This study aimed to determine the seroprevalence and geographical distribution of Ehrlichia spp., Anaplasma spp., Borrelia burgdorferi and Dirofilaria immitis in dogs in Mexico, including owned dogs from veterinary clinics with regular medical care and shelter dogs. The Mexican territory was divided into eight geographical regions; 22 out of 32 states were included; 110 veterinary clinics and 53 dog shelters participated. SNAP® 4Dx Plus® (IDEXX® Laboratories) was used to detect antibodies against Ehrlichia spp., Anaplasma spp., Borrelia burgdorferi and Dirofilaria immitis antigens. A total of 3522 apparently healthy dogs were tested, 1648 from clinics and 1874 from shelters. The highest seroprevalence of infection/exposure was found for Ehrlichia spp. (30.9%), followed by Anaplasma spp. (14.6%), D. immitis (5.3%) and B. burgdorferi (0.1%). Significantly more positive dogs were older than 3 years. Regarding differences between facility types, there were only differences for D. immitis which was more prevalent in clinics than in shelters (OR â€‹= â€‹1.97; 95% CI: 1.45-2.69; P â€‹< â€‹0.0001). Co-infections were detected in 38.4% of the positive samples. Dogs from Mexican states located on the Atlantic and the Pacific coast were significantly more at risk for Ehrlichia spp. and Anaplasma spp. infections than dogs from interior states. Dogs in Atlantic coastal states were more at risk for Dirofilaria immitis infection.

Characteristics of Respiratory Syncytial Virus versus Influenza Infection in Hospitalized Patients of Peru: A Retrospective Observational Study.

Respiratory syncytial virus (RSV) and influenza infections are important causes of respiratory illness associated with hospitalizations in children in Peru; however, comparisons of RSV and influenza hospitalization across all age groups are not available in Peru. Therefore, we conducted an observational, retrospective study between May 2015 and October 2021 using hospitalization from RSV and influenza infection data obtained from SUSALUD (open data) in Peru to compare the baseline characteristics of sex, age, region, and infection type. For the study, 2696 RSV-infected and 1563 influenza-infected hospitalized patients from different age groups were included. Most hospitalizations from RSV infection and the influenza virus occurred in children <5 years of age (86.1% vs. 32.2%, respectively). Compared with influenza infection, RSV infection was less likely to occur in individuals ≥5 years of age (adjusted odds ratio (aOR) = 0.07; 95% confidence interval (CI), 0.06−0.08; p < 0.0001; compared to <5 years of age), and more likely to occur in highlands (aOR = 1.75; 95% CI, 1.46−2.07; p < 0.0001, compared to coast region), and jungle region (aOR = 1.75; 95% CI, 1.27−2.41; p = 0.001, compared to coast region). Among the respiratory complications, RSV pneumonia was less likely to occur between different age groups (aOR = 0.29; 95% CI, 0.22−0.37; p < 0.0001, compared to <5 years of age), compared with influenza pneumonia. These findings on the RSV-hospitalization and its complications are helpful for health services planning and may increase awareness of the Peruvian population's RSV and influenza disease burden.

La bioseguridad odontológica desde la percepción del odontopediatra en tiempos de COVID-19, Lima, 2020

Objetivo: Describir las percepciones de los odontopediatras con respecto a la bioseguridad para la atención odontológica en tiempos de COVID-19 en Lima, 2020. Materiales y métodos: Estudio cualitativo, de método fenomenológico y de análisis de contenidos. Se llevaron a cabo entrevistas semiestructuradas a profundidad a 18 odontopediatras, siguiendo las pautas descritas en una guía, a través de la plataforma de videoconferencias Zoom, luego de la aceptación virtual del respectivo consentimiento informado. Se empleó el software Atlas.ti versión 8.4 para el análisis de los datos, donde se cargaron todos los archivos transcritos textualmente de cada entrevista. Resultados: Los odontopediatras perciben estar empoderados profesionalmente de los conocimientos sobre medidas de bioseguridad y destacan el dominio de diversas técnicas como enjuague bucal, uso de equipos de protección personal, control de aerosoles, distancia entre pacientes y desinfección de ambientes, relevantes para la seguridad del paciente. Así mismo, refieren que las normas de bioseguridad son algo confusas, poco claras y carecen de enfoque pediátrico. Conclusiones: Los odontopediatras constituyen recursos humanos en salud estratégicos por tener un bagaje de conocimientos de bioseguridad como parte de su preparación profesional, además de recibir capacitación sobre las nuevas normativas de bioseguridad en el contexto de la pandemia del COVID-19. Es importante estandarizar criterios y enfoques en el modelo de atención de odontopediatría y garantizar las condiciones para la sostenibilidad de esta práctica profesional.

Objective: To describe pediatric dentists' perceptions regarding dental biosafety in times of COVID-19 in Lima, 2020. Materials and methods: A qualitative, phenomenological and content-analysis study. In-depth semi-structured interviews were conducted with 18 pediatric dentists through the Zoom videoconferencing platform, following the guidelines described in a guide and after obtaining the pertinent virtual informed consent. ATLAS.ti software version 8.4 was used for data analysis, where all the verbatim files of each interview were uploaded. Results: Pediatric dentists perceived themselves to be professionally empowered with knowledge about biosafety measures. Moreover, they highlighted the mastery of various techniques such as mouthwash, use of personal protective equipment, control of aerosols, social distancing between patients and disinfection of environments, which are essential for patient safety. They also reported that biosafety regulations are somewhat confusing, unclear, and lack a pediatric approach. Conclusions: Pediatric dentists are strategic human resources for healthcare because they gained biosafety knowledge as part of their professional education and received training on new biosafety regulations in the context of the COVID-19 pandemic. It is important to standardize the criteria and approaches in the model of care for pediatric dentistry and guarantee the conditions for the sustainability of this professional practice.

Nonlinear Two-Photon Absorption in the Near-Infrared Band for Lead Bromide Perovskite Films Using an F-Scan Nonlinear Spectrometer.

An F-scan nonlinear spectrometer is used to measure the two-photon absorption coefficient for CH3NH3PbBr3 perovskite films from 690 to 995 nm. This spectrometer uses an electrically focused tunable lens and a tunable femtosecond-pulse laser (Mai Tai-HP) with a resolution of 5 nm. Two-band models and saturation irradiance corrections are used to fit the experimental data. The nonlinear absorption in this wavelength range is of the order of cm/MW. We found that the best agreement between the experimental data, the reported values in the literature, and the theoretical model is obtained for an extended two-band model with irradiance saturation correction.

Shared features and reciprocal complementation of the Chlamydomonas and Arabidopsis microbiota.

Microscopic algae release organic compounds to the region immediately surrounding their cells, known as the phycosphere, constituting a niche for colonization by heterotrophic bacteria. These bacteria take up algal photoassimilates and provide beneficial functions to their host, in a process that resembles the establishment of microbial communities associated with the roots and rhizospheres of land plants. Here, we characterize the microbiota of the model alga Chlamydomonas reinhardtii and reveal extensive taxonomic and functional overlap with the root microbiota of land plants. Using synthetic communities derived from C. reinhardtii and Arabidopsis thaliana, we show that phycosphere and root bacteria assemble into taxonomically similar communities on either host. We show that provision of diffusible metabolites is not sufficient for phycosphere community establishment, which additionally requires physical proximity to the host. Our data suggest the existence of shared ecological principles driving the assembly of the A. thaliana root and C. reinhardtii phycosphere microbiota, despite the vast evolutionary distance between these two photosynthetic organisms.

Scaling Up Science-Based Care for Depression and Unhealthy Alcohol Use in Colombia: An Implementation Science Project.

BACKGROUND: Mental disorders are a major cause of the global burden of disease and significantly contribute to disability and death. This challenge is particularly evident in low- and middle-income countries (LMICs), where >85% of the world's population live. Latin America is one region comprising LMICs where the burden of mental disorders is high and the availability of mental health services is low. This is particularly evident in Colombia, a country with a long-standing history of violence and associated mental health problems. METHODS: This article describes the design of a multisite implementation science project, "Scaling Up Science-Based Mental Health Interventions in Latin America" (also known as the DIADA project), that is being conducted in six primary care systems in Colombia. This project, funded via a cooperative agreement from the National Institute of Mental Health, seeks to implement and assess the impact of a new model for promoting widespread access to mental health care for depression and unhealthy alcohol use within primary care settings and building an infrastructure to support research capacity and sustainability of the new service delivery model in Colombia. This care model centrally harnesses mobile health technology to increase the reach of science-based mental health care for depression and unhealthy alcohol use. RESULTS: This initiative offers great promise to increase capacity for providing and sustaining evidence-based treatment for depression and unhealthy alcohol use in Colombia. NEXT STEPS: This project may inform models of care that can extend to other regions of Latin America or other LMICs.

Damage control approach to refractory neurogenic shock: a new proposal to a well-established algorithm.

Resuscitative endovascular balloon occlusion of the aorta (REBOA) is commonly used as an adjunct to resuscitation and bridge to definitive control of non-compressible torso hemorrhage in patients with hemorrhagic shock. It has also been performed for patients with neurogenic shock to support the central aortic pressure necessary for cerebral, coronary and spinal cord perfusion. Although volume replacement and vasopressors are the cornerstones of the management of neurogenic shock, we believe that a REBOA can be used as an adjunct in carefully selected cases to prevent prolonged hypotension and the risk of further anoxic spinal cord injury. This manuscript aims to propose a new damage control algorithmic approach to refractory neurogenic shock that includes the use of a REBOA in Zone 3. There are still unanswered questions on spinal cord perfusion and functional outcomes using a REBOA in Zone 3 in trauma patients with refractory neurogenic shock. However, we believe that its use in these case scenarios can be beneficial to the overall outcome of these patients.

El Balón de Resucitación Endovascular de Oclusión Aórtica (REBOA) se utiliza habitualmente como complemento de la reanimación y como puente para el control definitivo de la hemorragia no compresible del torso en pacientes con shock hemorrágico. También se ha implementado en pacientes con choque neurogénico para mantener la presión aórtica central necesaria para la perfusión cerebral, coronaria y de la médula espinal. Aunque la reanimación hídrica y el uso de vasopresores son los pilares en el manejo del choque neurogénico, el REBOA puede utilizarse como complemento en casos cuidadosamente seleccionados para evitar la hipotensión prolongada y el riesgo de una lesión medular anóxica mayor. El objetivo de este artículo es proponer un algoritmo para el abordaje y manejo del choque neurogénico refractario que incluye el uso del REBOA en Zona III como estrategia para el control de daños. Todavía existen interrogantes respecto a la perfusión de la médula espinal y aún se cuestionan los resultados funcionales con el uso del REBOA en pacientes con trauma y choque neurogénico refractario. No obstante, se cree que el uso adecuado del REBOA en determinados escenarios puede mejorar los resultados globales de estos pacientes.

Success rate of nitrous oxide-oxygen procedural sedation in dental patients: systematic review and meta-analysis.

The aim of this systematic review was to determine the success rate of nitrous oxide-oxygen procedural sedation (NOIS) in dentistry. A systematic digital search was conducted for publications or reports of randomized controlled trials evaluating the clinical performance of NOIS. Abstracts of research papers were screened for suitability, and full-text articles were obtained for those who met the inclusion and exclusion criteria accordingly. The quality of the studies was assessed using the revised Cochrane risk-of-bias tool (RoB 2). A total of 19 articles (eight randomized clinical trials with parallel intervention groups and 11 crossover trials), published between May 1988 and August 2019, were finally selected for this review. The studies followed 1293 patients reporting NOIS success rates, with a cumulative mean value of 94.9% (95% CI: 88.8-98.9%). Thirteen trials were conducted on pediatric populations (1098 patients), and the remaining six were conducted on adults (195 patients), with cumulative efficacy rates of 91.9% (95% CI: 82.5-98.1%) and 99.9% (95% CI: 97.7-100.0%), respectively. The difference was statistically significant (P = 0.002). Completion of treatment and Section IV of the Houpt scale were the most used efficacy criteria. Within the limitations of this systematic review, the present study provides important information on the efficacy rate of NOIS. However, further well-designed and well-documented clinical trials are required and there is a need to develop guidelines for standardization of criteria and definition of success in procedural sedation. Currently, completion of treatment is the most used parameter in clinical practice, though many others also do exist at the same time. To maximize NOIS efficacy, clinicians should strictly consider appropriate indications for the procedure.

Coronal knee moments of asymptomatic elderly individuals during gait: Preliminary study / Momentos articulares de la rodilla en el plano coronal durante la marcha de adultos mayores asintomáticos: estudio preliminar

ABSTRACT Introduction: Joint moments are explained by the forces that occur during gait and generate a movement in the joint. The maximum peak adduction moment (MPM) of the knee has been associated with osteoarthritis (OA). In Colombia, however, there are no references to these values for clinical use in an asymptomatic population. Objective: To describe the characteristics of joint moments in the coronal plane of the knee of asymptomatic elderly whilst walking. Materials and methods: This is a descriptive study that included 50 participants of both genders and older than 60 years old. They were residents of the metropolitan area del Valle de Aburrá that had volunteered and were capable of following indications without any external aids while walking, and with no pain. Gait analysis was performed when walking at a normal speed on a 6 m pathway on two force plates, and was registered by a system of 8 opto-electric 3D recording cameras. The statistical analysis was performed using SPSS 20. Results: A mean BMI of 26.34 kg/m2 was found, and the mean of the MPM was 0.26 Nm/kg, generating a graph with two peaks, with the first being of greater magnitude that occurred in 17% of the gait cycle. Conclusions: The MPM of 0.26Nm/kg found in this population is lower than that reported in the osteoarthritis population. A reference curve for gait analysis has been established in these asymptomatic elderly. It is essential that these values are available, in order to help the professional to make precise and quantitative diagnoses in gait alterations.

Resumen Introducción: El uso excesivo de teléfonos inteligentes conlleva manifestaciones musculoesqueléticas como el síndrome del túnel carpiano (STC) o la artritis de las articulaciones de las manos, con un aumento del área transversal del nervio mediano (CSA). Objetivo: El objetivo de este estudio es detectar oportunamente trastornos musculoesqueléticos de la mano utilizando una ecografía, así como detectar el atrapamiento nervioso mediante estudios clínicos de evaluación, ultrasonográficos y electrofisiológicos en nuestros empleados universitarios menores de 35 años que utilizan teléfonos inteligentes, con evaluación del Cuestionario de Resultados de Mano de Michigan (MHQ). Materiales y métodos: El estudio controlado transversal incluyó a 74 usuarios de teléfonos inteligentes que fueron clasificados en 2 grupos, según la escala de adicción a los teléfonos inteligentes (SAS), en usuarios de teléfonos inteligentes altos y bajos, con 35 no usuarios de teléfonos inteligentes con edad y sexo iguales, como grupo de control. El MHQ se utilizó para evaluar de la función de la mano con una puntuación total de 0 a 100. Se realizaron estudios electrodiagnósticos de la mediana de los nervios y cubitales para detectar el atrapamiento nervioso temprano. La ecografía bilateral se realizó para evaluar la CSA del nervio mediano y la afectación del pulgar y de las articulaciones pequen˜ as de las manos. Los datos recogidos fueron analizados por la versión 20 del programa SPSS. Resultados: Las CSA de los nervios medianos fueron significativamente más altas en la mano dominante de los usuarios altos que en los no usuarios bajos de teléfonos inteligentes (p < 0,001). Hubo una correlación positiva significativa entre la CSA y SAS (r −0,45), la escala analógica visual (VAS) (r −0,61) y la duración del uso del teléfono inteligente (r −0,80) con la correlación negativa con MHQ (r −0,63). Se encontraron diferencias significativas en los estudios electrofisiológicos de los nervios medios y cubitales. La puntuación ultrasonográfica media para ambas manos fue más alta en altos en comparación con los usuarios de teléfonos inteligentes bajos (15,08 × 4,17 frente a 6,46 × 1,38, p < 0,001). Conclusiones: Existe una asociación entre la adicción a los teléfonos inteligentes y el área transversal del nervio mediano asociada con el aumento de las CSA entre los usuarios de teléfonos inteligentes altos en comparación con los usuarios bajos y no inteligentes. Se debe tener precaución al usar teléfonos inteligentes para minimizar el riesgo de desarrollo de trastornos musculoesqueléticos de las manos.

Momento aductor de la cadera durante la marcha en adultos mayores asintomáticos / Hip adductor moment during gait in asymptomatic older adults

Resumen Introducción: El momento articular durante la marcha se ha relacionado con diferentes procesos clínicos en la población adulto mayor, en Colombia no se cuentan con reportes propios. Objetivo: Analizar el momento aductor de la cadera durante la marcha de adultos mayores asintomáticos. Materiales y métodos: Se evaluó a 110 participantes siguiendo las referencias del software VICON NEXUS 2.8.1 modelo Full Body, se utilizó 2 plataformas de fuerza y el volumen de captura estuvo delimitado por 8 cámaras opto eléctricas Bonita 10. Se incluyó variables antropométricas, sociodemográficas, espaciotemporales y cinéticas durante la fase de apoyo, resaltando los dos picos máximos del momento aductor. Resultados: Las cifras del Pico Momento Aductor 1 y 2 (PMA1 y PMA2) fueron de 0,76 y 0,70 Nm/Kg respectivamente, estos picos se relacionaron con masa, talla e índice de masa corporal. Se construyó así una referencia para el análisis de adultos mayores asintomáticos. Conclusiones: La gráfica del momento aductor de la cadera es similar a la descrita por otros investigadores, pero en menor magnitud que en la población sintomática de coxartrosis.

Abstract Introduction: Although joint moment during waking has been associated with different clinical processes in the elderly population, there is a lack of reports in Colombia. Objective: To analyze the hip adductor moment during gait in asymptomatic older adults. Materials and methods: 110 participants were assessed using the VICON NEXUS 2.8.1. Full Body model software. 2 force platforms were used and the capture volume was delimited through 8 Bonita-10 optoelectronic cameras. Anthropometric, sociodemographic, spatiotemporal, and kinetic variables were included during the support phase, highlighting the two maximum peaks of the adductor moment. Results: The figures for Adductor Moment Peaks 1 and 2 (AMP1 and AMP2) were 0.76 and 0.70 Nm/Kg, respectively, which were related to mass, height and body mass index. Thus, a reference for the analysis of asymptomatic older adults was developed. Conclusion: The hip adductor moment graph is similar to that described by other researchers, but to a lesser extent than the values seen in coxarthrosis symptomatic population.

Reimagining magnetic resonance instrumentation using open maker tools and hardware as protocol.

Over the course of its history, the field of nuclear magnetic resonance spectroscopy has been characterized by alternating periods of intensive instrumentation development and rapid expansion into new chemical application areas. NMR is now both a mainstay of routine analysis for laboratories at all levels of education and research. On the other hand, new instrumentation and methodological advances promise expanded functionality in the future. At the core of this success is a community fundamentally dedicated to sharing ideas and collaborative advancements, as exemplified by the extensive remixing and repurposing of pulse sequences. Recent progress in modularity, automation, and 3D printing have reignited the tinkering spirit and demonstrate great promise to mature into a maker space that will enable similarly facile sharing of new applications and broader access to magnetic resonance.

Damage control approach to refractory neurogenic shock: a new proposal to a well-established algorithm / El control de daños en el choque neurogénico refractario: propuesta de un nuevo algoritmo de manejo

Abstract Resuscitative endovascular balloon occlusion of the aorta (REBOA) is commonly used as an adjunct to resuscitation and bridge to definitive control of non-compressible torso hemorrhage in patients with hemorrhagic shock. It has also been performed for patients with neurogenic shock to support the central aortic pressure necessary for cerebral, coronary and spinal cord perfusion. Although volume replacement and vasopressors are the cornerstones of the management of neurogenic shock, we believe that a REBOA can be used as an adjunct in carefully selected cases to prevent prolonged hypotension and the risk of further anoxic spinal cord injury. This manuscript aims to propose a new damage control algorithmic approach to refractory neurogenic shock that includes the use of a REBOA in Zone 3. There are still unanswered questions on spinal cord perfusion and functional outcomes using a REBOA in Zone 3 in trauma patients with refractory neurogenic shock. However, we believe that its use in these case scenarios can be beneficial to the overall outcome of these patients.

Resumen El Balón de Resucitación Endovascular de Oclusión Aórtica (REBOA) se utiliza habitualmente como complemento de la reanimación y como puente para el control definitivo de la hemorragia no compresible del torso en pacientes con shock hemorrágico. También se ha implementado en pacientes con choque neurogénico para mantener la presión aórtica central necesaria para la perfusión cerebral, coronaria y de la médula espinal. Aunque la reanimación hídrica y el uso de vasopresores son los pilares en el manejo del choque neurogénico, el REBOA puede utilizarse como complemento en casos cuidadosamente seleccionados para evitar la hipotensión prolongada y el riesgo de una lesión medular anóxica mayor. El objetivo de este artículo es proponer un algoritmo para el abordaje y manejo del choque neurogénico refractario que incluye el uso del REBOA en Zona III como estrategia para el control de daños. Todavía existen interrogantes respecto a la perfusión de la médula espinal y aún se cuestionan los resultados funcionales con el uso del REBOA en pacientes con trauma y choque neurogénico refractario. No obstante, se cree que el uso adecuado del REBOA en determinados escenarios puede mejorar los resultados globales de estos pacientes.

Impacto de la introducción del cubrebocas contra el COVID-19: una revisión narrativa / Impact of the introduction of the mask against COVID-19: a narrative review

RESUMEN El objetivo de este trabajo fue identificar el impacto de la introducción del cubrebocas contra el COVID-19. Se realizó una revisión de la literatura disponible en una base de datos especializada (PubMed), la cual se ajustó a las directrices enmarcadas en la metodología PRISMA (1). Se definieron ecuaciones de búsqueda bajo los términos MeSH: humanos (MeSH D006801), COVID-19 (MeSH D000086382), máscaras (MeSH D008397), SARS-CoV-2 (MeSH D000086402) y diseño de equipos (MeSH D004867), utilizando el carácter booleano AND. Con estas ecuaciones se buscaron artículos publicados en 2020: se recuperaron 676 registros en total, de los cuales se eligieron 82 que abordan el tema de interés y se incluyeron en la revisión final 49 artículos que cumplían con todos los criterios de inclusión y exclusión definidos. Los resultados sugieren que la introducción de mascarillas tuvo un impacto positivo para reducir el riesgo de COVID-19 y el uso inadecuado del cubrebocas es un factor de riesgo.

ABSTRACT The objective of this work was to identify the impact of the introduction of the mask against COVID-19. A review of the literature available in a specialized database, PubMed, was carried out, which was adjusted to the guidelines framed in the PRISMA methodology (1). Search equations were defined under the terms MeSH: human (MeSH D006801), COVID-19 (MeSH D000086382), masks (MeSH D008397), SARS-CoV-2 (MeSH D000086402) and equipment design (MeSH D004867), using the Boolean AND character. With these equations, articles published in 2020 were searched, recovering 676 records in total, choo-sing 82 that address the topic of interest and including in the final review 49 articles that met all the defined inclusion and exclusion criteria. The results suggest that the introduction of masks had a positive impact on reducing the risk of COVID-19 and the inappropriate use of masks is a risk factor.

Seasonal and diel patterns of abundance and activity of viruses in the Red Sea.

Virus-microbe interactions have been studied in great molecular details for many years in cultured model systems, yielding a plethora of knowledge on how viruses use and manipulate host machinery. Since the advent of molecular techniques and high-throughput sequencing, methods such as cooccurrence, nucleotide composition, and other statistical frameworks have been widely used to infer virus-microbe interactions, overcoming the limitations of culturing methods. However, their accuracy and relevance is still debatable as cooccurrence does not necessarily mean interaction. Here we introduce an ecological perspective of marine viral communities and potential interaction with their hosts, using analyses that make no prior assumptions on specific virus-host pairs. By size fractionating water samples into free viruses and microbes (i.e., also viruses inside or attached to their hosts) and looking at how viral group abundance changes over time along both fractions, we show that the viral community is undergoing a change in rank abundance across seasons, suggesting a seasonal succession of viruses in the Red Sea. We use abundance patterns in the different size fractions to classify viral clusters, indicating potential diverse interactions with their hosts and potential differences in life history traits between major viral groups. Finally, we show hourly resolved variations of intracellular abundance of similar viral groups, which might indicate differences in their infection cycles or metabolic capacities.

Descripción de elementos de radioprotección y dosimetría en unidades de cardiología intervencionista sudamericanas: un estudio piloto / Radioprotection and dosimetry in Interventional cardiology units in South America. a pilot study

ANTECEDENTES: Las unidades de Cardiología intervencional han evidenciado un número creciente de procedimientos, cada vez más variados y complejos, lo cual podría eventualmente generar daños a los profesionales ocupacionalmente expuestos a radiaciones ionizantes (POEs) de no contar con los adecuados elementos de radioprotección y un uso correcto de ellos. OBJETIVO: Caracterizar la disponibilidad y utilización de los elementos de radioprotección y dosimetría de unidades de cardiología intervencionista de centros Sudamericanos. MATERIAL Y MÉTODOS: Se realizó una encuesta autoaplicada a 139 POEs, de ambos sexos de 7 países, a través de una plataforma on-line, se les consultó sobre características demográficas, dosimétricas y de radioprotección. RESULTADOS: Los elementos de radioprotección más tradicionales; delantales y cuellos plomados se utilizaron un 99,5 % y 98,4 % respectivamente, aquellos elementos más recientes como gafas, gorros y paños plomados solo alcanzaron un 36,8 %, 6,8 % y 34,2%, de utilización respectivamente, en cuanto a la utilización de los dosímetros, solo un 7,9 % lo hace apegado a las normas de la Organización Internacional de Energía Atómica (OIEA). CONCLUSIÓN: Se constató en la muestra analizada una falta de elementos de radioprotección y un uso inadecuado de ellos, urge realizar intervenciones educativas y técnicas para mejorar estos datos.

BACKGROUND: Due to the increasing number of interventional cardiology procedures currently performed, health professionals (POE) are exposed to ionizing radiation unless adequate protective elements are used. AIM: to describe the use of radioprotection elements and dosimetry in interventional cardiology laboratories in South America. METHODS: A self-administered survey was performed on 139 POE of both sexes and 7 countries using an online platform. Demographic data, dosimetry and characteristics of radioprotection analyzed. RESULTS: Commonly used radioprotective elements (lead aprons and collars) were used in 99.5% and 98% respectively. Recently introduced protection elements like lead goggles, caps and drapery were used in 36.8, 6.8 and 34.2% , respectively. Dosimetry according to the International Atomic Energy Commission (OIAE) was performed in only 7.9% of the procedures. CONCLUSION: there is a severe lack of adequate radioprotection during interventional cardiology procedures. Urgent measures, including technical implementation and educational interventions are needed to improve radioprotection in interventional cardiology.

Gait parameters in a sample of healthy Colombian adults aged between 18 and 25 years: a cross-sectional study / Parámetros de la marcha en una muestra de adultos sanos colombianos entre 18 y 25 años, un estudio transversal

Abstract Introduction: Gait analysis is fundamental for assessing the functional capacity and motor skills of any individual. Therefore, a reliable and specific analysis method is necessary to study gait in different populations. However, the reference values of gait parameters currently used in Colombia come from studies conducted on population groups from other countries or regions. Objective: To identify the reference values of gait kinematic parameters in healthy Colombian young adults. Materials and methods: A quantitative, descriptive, and cross-sectional study was conducted. The sample consisted of 155 Colombian young adults (aged 18 to 25). Temporal-spatial parameters and kinematics data of each participant were measured through 3D motion capture, which was performed using 8 infrared cameras (Bonita 10) and the VICON NEXUS 1.8.5. software. POLYGON 4.1. software was used for data analysis, and statistical analysis was performed using the STATA 12.1. software package. Results: Average age, height and BMI were 20.3 years, 1.66m and 21.91T kg/m2, respectively. 41.29% of participants were male. The average values obtained for the cadence, stride time, speed and initial swing temporal-spatial parameters were as follows: 103 steps/min, 1.16 seconds, 1.01 m/s, and 59.62% of the gait cycle (both sides), respectively. Conclusion: Normal gait kinematic and temporal-spatial parameters of a group of healthy Colombian young adults were obtained, which will allow establishing the characteristics of normal gait in this population, improving intervention strategies, and designing and implementing technical aids aimed at improving locomotion in Colombian individuals.

Resumen Introducción. El análisis de la marcha es un componente fundamental para evaluar la capacidad motora y funcional de un individuo, por lo que su estudio en diferentes poblaciones requiere un método de análisis confiable y específico. Sin embargo, los parámetros de referencia usados en Colombia provienen de poblaciones de otros países o regiones. Objetivo. Identificar los parámetros cinemáticos de referencia de la marcha en adultos sanos colombianos con edades entre 18 y 25 años. Materiales y métodos. Estudio cuantitativo, descriptivo y de corte transversal realizado en 155 colombianos sanos entre 18 y 25 años. Los parámetros temporo-espaciales y los datos cinemáticos de cada participante fueron medidos mediante captura de movimiento 3D, la cual fue realizada con 8 cámaras infrarrojas (Bonita 10) y el software VICON NEXUS 1.8.5. Los datos fueron analizados con el programa POLYGON 4.1; para el análisis estadístico se utilizó el software STATA 12.1. Resultados. Los promedios de edad, altura e IMC de la muestra fueron 20.3 años, 1.66m y 21.91 kg/m2, respectivamente; además, el 41.29% de los participantes eran hombres. Los promedios obtenidos para los parámetros temporo-espaciales cadencia del paso, duración de la zancada, velocidad e inicio del balanceo fueron: 103 pasos/min, 1.16 segundos, 1.01 m/s y 59.62% del ciclo (ambos lados), respectivamente. Conclusión. Se obtuvieron los parámetros cinemáticos y temporo-espaciales de la marcha normal de un grupo de jóvenes sanos colombianos, lo cual permitirá establecer las características de la marcha patológica en los adultos jóvenes del país, perfeccionar estrategias de intervención y diseñar e implementar ayudas técnicas que busquen mejorar la locomoción en población colombiana.

Programa Articulado Nutricional y su impacto en la desnutrición crónica en menores de cinco años Dirección Regional de Salud Callao, 2009-2015 / The Articulated Nutritional Program and its impact on chronic malnutrition in children under five years of age. Dirección Regional de Salud Callao, 2009-2015

RESUMEN Objetivo Determinar el impacto del Programa Articulado Nutricional (PAN) en la desnutrición crónica en menores de cinco años, su correlación con la ejecución presupuestal del PAN y la prevalencia de la desnutrición crónica en la Dirección Regional de Salud (DIRESA) Callao, 2009-2015. Materiales y métodos Estudio cuanticualitativo, observacional ecológico, correlacional, longitudinal y retrospectivo. Se determinó el coeficiente de correlación de Pearson en el análisis cuantitativo. Los datos cualitativos se obtuvieron a partir de entrevistas a profundidad con apoyo de una guía semiestructurada. Resultados No existe una relación entre el Presupuesto Institucional Modificado (PIM) del PAN y la prevalencia de desnutrición crónica (p=0,92). No existe una relación entre la ejecución presupuestal del PIM y la prevalencia de desnutrición crónica (p=0,355). Los factores que influyeron en la ejecución del PAN son presupuesto inoportuno, retraso en la implementación del PAN, dificultades en la organización de los servicios de salud, y población con poca educación para el cuidado del niño y migrante. Conclusiones No se encontró un impacto positivo entre el PAN y la disminución de la prevalencia de desnutrición crónica a nivel de la DIRESA Callao 2009-2015. Los factores cualitativos que influyen en el PAN estuvieron relacionados a procesos y a la organización de la DIRESA Callao, a excepción de la población que corresponde a un factor externo.

ABSTRACT Objective To determine the impact of the Articulated Nutritional Program (PAN) on chronic malnutrition in children under five years of age, its correlation with the PAN's budget execution, and the prevalence of chronic malnutrition at the Dirección Regional de Salud (DIRESA) Callao, 2009-2015. Materials and methods A quantitative, qualitative, observational, ecological, correlational, longitudinal and retrospective study was carried out. The Pearson correlation coefficient was determined in the quantitative analysis. Qualitative data was obtained from in-depth interviews with the support of a semi-structured guide. Results There is no relationship between the PAN's Modified Institutional Budget (PIM) and the prevalence of chronic malnutrition (p = 0.92). There is no relationship between the budget execution of the PIM and the prevalence of chronic malnutrition (p = 0.355). The factors that influenced the execution of the PAN are untimely budget, delayed implementation of the PAN, difficulties in the organization of health services, and population with little education on child and migrant care. Conclusions No positive impact was found between the PAN and the decrease in the prevalence of chronic malnutrition at the DIRESA Callao between 2009 and 2015. The qualitative factors that influence the PAN were related to processes and the organization of the DIRESA Callao, with the exception of the population corresponding to an external factor.