Características epidemiológicas y radiológicas en un grupo de pacientes con neumonía tuberculosa sin inmunodepresión o comorbilidades / Epidemiological and Radiological Characteristics of a Group of Patients with Tuberculous Pneumonia without Immunosuppression or Comorbidities

La neumonía tuberculosa es una patología poco frecuente, descripta mayormente en pacientes con inmunosupresión o comorbilidades, como alcoholismo o diabetes, con una presentación radiológica similar a la neumonía bacteriana, lo cual puede dar lugar a retrasos en el diagnóstico. En este trabajo, se incluyeron pacientes con diagnóstico de tuberculosis e imagen radiológica de consolidación en los campos pulmonares inferiores y sin comorbilidades asociadas. En el transcurso de tres años identificamos veinticinco pacientes con estos criterios entre 628 casos de tuberculosis pulmonar evaluados. No encontramos relación con el sexo, y resulta más frecuente la afectación del lóbulo inferior derecho (84%) que el izquierdo.

Tuberculous pneumonia is a rare disease, mostly described in patients with immunosup pression or comorbidities such as alcoholism or diabetes, with a radiological presentation similar to bacterial pneumonia, which can lead to delays in diagnosis. Patients with a diagnosis of tuberculosis and radiological image of consolidation in the lower lung fields and without associated comorbidities were included in this study. Over the course of 3 years, we identified 25 patients with these criteria among 628 cases of pulmonary tuberculosis evaluated. We found no relationship with sex, with the right lower lobe be ing affected more frequently (84%) than the left.

Natural antimicrobial systems protected by complex polyhydroxyalkanoate matrices for food biopackaging applications - A review.

Interest is growing in entrapping natural antimicrobial compounds (NACs) within polyhydroxyalkanoates (PHAs) to produce active food-biopackaging systems. PHAs are versatile polymeric macromolecules that can protect NAC activity by entrapment. This work reviews 75 original papers and 18 patents published in the last 11 years concerning PHAs as matrices for NACs to summarize the physicochemical properties, release, and antimicrobial activities of systems fabricated from PHAs and NACs (PHA/NAC systems). PHA/NAC systems have recently been used as active food biopackaging systems to inactivate foodborne pathogens and prolong food shelf life. PHAs protect NACs by increasing the degradation temperature of some NACs and decreasing their loss of mass when heated. Some NACs also transform the PHA/NAC systems into more thermostable, flexible, and resistant when interacting with PHAs while also improving the barrier properties of the systems. NAC release and activity are also prolonged when NACs are trapped within PHAs. PHA/NAC systems, therefore, represent ecologically friendly materials with promising applications.

Pre-Germinative Treatments and Morphophysiological Traits in Enterolobium cyclocarpum and Piscidia piscipula (Fabaceae) from the Yucatan Peninsula, Mexico.

Enterolobium cyclocarpum and Piscidia piscipula are two important tree Fabaceae species distributed from the Yucatan Peninsula, Mexico. Our aims were focused on the E. cyclocarpum and P. piscipula seeds for: (1) to examine the seed permeability and imbibition rate, (2) to evaluate the effect of seed pre-germinative treatments, and (3) to characterize the structures involved on the presence of physical dormancy (PY). We used fresh seeds to determine seed permeability and imbibition rate, seed viability by means of tetrazolium test, furthermore, we applied mechanical scarification and boiler shocks for 5 s, 10 s and 15 s treatments. Morphological characterization of the seed coat was by Scanning Electron Microscope (SEM). Seed viability in E. cyclocarpum and P. piscipula were 100% and 96%, respectively. Seed permeability and imbibition rate in E. cyclocarpum were low. The highest germination in E. cyclocarpum was in the mechanical scarification (92%), while in P. piscipula, this parameter was in the 10 s boiling water treatment (76.0%). The presence of PY was confirmed in both species because they showed low seed permeability, and imbibition rate; furthermore, exhibited macrosclereids cells. The present research seeks to promote the sustainable use of E. cyclocarpum and P. piscipula.

Early evidence of the artificial transfer/transplant of mitochondria to oocytes and zygotes by MitoCeption.

Oocytes may carry mutations in their mitochondrial DNA (mtDNA) which affect fertility and embryo development leading to hereditary diseases or rejection. Mitochondrial replacement therapies (MRTs) such as polar body transfer, spindle transfer and pronuclear transfer, aim to change dysfunctional to normal mitochondria inside oocytes and zygotes resulting in healthier offspring. Even with promising results, MRTs techniques are invasive to oocytes and may negatively affect their viability and the success of the procedure. This article shows early evidence of the use of MitoCeption, a mitochondria transfer/transplant (AMT/T) technique to possibly induce the internalization of exogenous mitochondria in a dose-dependent manner to recipient oocytes in comparison to coincubation. By using human isolated mitochondria in a mix obtained from different donors we were able to identify their mtDNA in murine oocytes by qPCR. Fluorescence microscopy showed that exogenous and transferred mitochondria (MitoTracker ® Red) by MitoCeption were internalized in oocytes and zygotes (CellTracker® Green). After maintaining mitocepted zygotes to two-cell embryos, we transferred them to subrogate female mice and obtained healthy mice pups; however, without clear evidence of the maintenance of human mtDNA in the tissues of mice pups. These early results are puzzling, and they open the path to generate more research regarding the use of MitoCeption in comparison to coincubation in order to transfer mitochondria to oocytes using less invasive procedures.

Características clínicas de un grupo de pacientes que persisten con síntomas respiratorios después de la fase aguda de COVID-19 / Clinical characteristics of a group of patients who persist with respiratory symptoms after the acute phase of COVID-19

Resumen En la convalecencia de la infección por coronavirus SARS-CoV-2 un elevado número de pacientes requiere consulta médica por persistir sintomáticos. Objetivo: Describir las características clínicas de pacientes que, luego del alta epidemiológica de COVID-19, concurren a un servicio de neumonología por persistir con síntomas respiratorios o torácicos, y valorar su etiología mediante la aplicación de un protocolo de seguimiento. Materiales y métodos: Ingresaron al estudio pacientes con diagnóstico previo de COVID-19, mediante PCR o combinación de síntomas y criterios epidemiológicos, que se presentaron con derivación o en forma espontánea al servicio de neumonología. Se realizó examen clínico, radiografía de tórax, espirometría, análisis de laboratorio y los cuestionarios de calidad de vida EQ-5D y de depresión PHQ-9. Según los hallazgos se complementó la evaluación con dímero D, prueba de marcha de 6 minutos (PM6M), tomo grafía computada (TC) y evaluación cardiológica, siguiendo un algoritmo predeterminado. Se les ofreció consulta con salud mental a los pacientes con resultado igual o mayor de 10 en el cuestionario PHQ-9. Resultados: Se incorporaron 95 pacientes: edad 48 ± 11 años, IMC = 28,4 ± 4,9 kg/m2, 57 (60%) mujeres y 64 (67,5%) de nacionalidad argentina. Entre los extranjeros: 19 (20%) eran de nacionalidad boliviana, 8 (8,5%) peruana y 4 (4%) paraguaya. Tenían diagnóstico confirmado mediante PCR 91 pacientes, entre los restantes: dos tenían serología positiva y dos criterios clínicos y epidemiológicos. Las comorbilidades más frecuentes fueron tabaquismo (34%), hipertensión arterial (21%), diabetes (16%), asma (11%) y tubercu losis (5%); el 38% no refirió ninguna. Provenían de la internación 45 pacientes, de los cuales 8 requirieron terapia intensiva (UTI). El tiempo de consulta desde el alta epidemiológica fue de 46 ± 34 días (mediana = 38 días), y los síntomas más frecuentes fueron disnea (60%), tos (32%), dolor torácico (26%), lumbalgia (22%) y astenia (10.5%); 50 pacientes requirieron antiinflamatorios no esteroideos (AINEs) para el manejo del dolor. Respecto del cuestionario de depresión: el 79% presentó PHQ-9 > 4 (depresión leve) y el 36% ≥ 10 (depresión moderada y severa), en este último grupo encontramos mayor prevalencia en mujeres: 44 vs 24%, p = 0,03. No encontramos relación entre depresión valorada con PHQ-9 y edad, nacionalidad o lugar de aislamiento; 13 pacientes aceptaron realizar una consulta con el equipo de salud mental (PHQ-9 14,9 ± 4; EQ-5D 39 ± 10). En 6 pacientes la espirometría mostró valores de volumen espiratorio forzado en el primer segundo (VEF1) y/o capacidad vital forzada (CVF) < 80%, los cuales tenían antecedentes de neumoconiosis (n = 1), asma (n = 1) y obesidad (n = 1), dos presentaban alteraciones en la radiografía de tórax y el restante provenía de la unidad de terapia intensiva (UTI). En 24 pacientes se realizaron estudios adicio nales (PM6M:3, TC:6, ecocardiograma: 2, dímero D: 21). Se encontró persistencia de densidades en vidrio esmerilado en 5 de las 6 tomografías. Ninguno de los pacientes requirió conductas médicas adicionales durante el seguimiento. Conclusión: En pacientes post COVID-19, los síntomas más frecuentes de consulta fueron disnea, tos y dolor torácico o lumbar, como también el hallazgo de depresión valorada por cuestionario. Los resultados favorecen el enfoque holístico en la evaluación y seguimiento de estos casos.

Clinical characteristics of a group of patients who persist with respiratory symptoms after the acute phase of COVID-19

Abstract In convalescence from the SARS-CoV-2 infection, a high number of patients require medical consultation due to persisting symptoms. Objective: To describe the clinical characteristics of patients who attend the Department of Respiratory Medicine due to persisting respiratory or thoracic symptoms after COVID-19 epidemiological discharge, and to assess their etiology by applying a follow-up protocol. Materials and Methods: we included patients previously diagnosed with COVID-19 through PCR or with a combination of symp toms and epidemiological criteria who attended the Department of Respiratory Medicine spontaneously or referred by another health professional. Clinical examination, chest X-ray, spirometry, laboratory analysis, and the EQ-5D quality of life and PHQ-9 depression questionnaires were performed. According to the findings, the evaluation was complemented with D-dimer, six-minute walk test (6MWT), computed tomography (CT) and cardiac evaluation, following a predetermined algorithm. Mental health consultation was offered to patients with a result ≥ 10 in the PHQ-9 questionnaire. Results: 95 patients were included: age 48 ± 11 years, BMI (Body Mass Index) = 28.4 ± 4.9 kg/m2, 57 (60%) women and 64 (67.5%) Argentinians. Among foreigners: 19 (20%) were Bolivian, 8 (8.5%) Peruvian and 4 (4%) Paraguayan. 91 patients had a PCR-confirmed diagnosis; and from the remaining patients, two had positive serology and two clinical and epidemiological criteria. The most frequent comorbidities were: smoking (34%), arterial hypertension (21%), diabetes (16%), asthma (11%) and tuberculosis (5%); 38% did not refer any. 45 patients had been hospitalized, and 8 of them required treatment in the intensive care unit (ICU). The consultation time from epidemiological discharge was 46 ± 34 days (median = 38 days), and the most frequent symptoms were dyspnea (60%), cough (32%), chest pain (26%), low back pain (22%) and asthenia (10.5%); 50 patients required non-steroidal anti-inflammatory drugs (NSAIDs) for pain management. Regarding the depression questionnaire: 79% presented PHQ-9 > 4 (mild depression) and 36% ≥ 10 (moderate and severe depression); in the latter group we found higher prevalence in women: 44 vs. 24%, p= 0.03. We didn't find a relationship between depression assessed with PHQ-9 and age, nationality or isolation location; 13 patients agreed to consult with the Department of Mental Health (PHQ-9 14.9 ± 4; EQ-5D 39 ± 10). In 6 patients, the spirometry showed values of forced expiratory volume in the first second (FEV1) and/or forced vital capacity (FVC) < 80%; they had history of pneumoconiosis (n = 1), asthma (n = 1) and obesity (n = 1), two presented an abnormal chest X-ray and the other one had been treated in the intensive care unit (ICU). Additional studies were performed in 24 patients (six-minute walk test [6MWT]: 3, CT: 6, echocardiogram: 2, D-dimer: 21). Persistence of ground-glass densities was found in 5 of the 6 tomographies. None of the patients required an additional medical approach during follow-up. Conclusion: In post-COVID-19 patients, the most frequent symptoms for consultation were dyspnea, cough and chest or lumbar pain, as well as the finding of depression assessed by a questionnaire. The results favor the holistic approach in the evaluation and follow-up of these cases.

A review of extracellular polysaccharides from extreme niches: An emerging natural source for the biotechnology. From the adverse to diverse!

Every year, new organisms that survive and colonize adverse environments are discovered and isolated. Those organisms, called extremophiles, are distributed throughout the world, both in aquatic and terrestrial environments, such as sulfurous marsh waters, hydrothermal springs, deep waters, volcanos, terrestrial hot springs, marine saltern, salt lakes, among others. According to the ecosystem inhabiting, extremophiles are categorized as thermophiles, psychrophiles, halophiles, acidophiles, alkalophilic, piezophiles, saccharophiles, metallophiles and polyextremophiles. They have developed chemical adaptation strategies that allow them to maintain their cellular integrity, altering physiology or improving repair capabilities; one of them is the biosynthesis of extracellular polysaccharides (EPS), which constitute a slime and hydrated matrix that keep the cells embedded, protecting from environmental stress (desiccation, salinity, temperature, radiation). EPS have gained interest; they are explored by their unique properties such as structural complexity, biodegradability, biological activities, and biocompatibility. Here, we present a review concerning the biosynthesis, characterization, and potential EPS applications produced by extremophile microorganisms, namely, thermophiles, halophiles, and psychrophiles. A bibliometric analysis was conducted, considering research articles published within the last two decades. Besides, an overview of the culture conditions used for extremophiles, the main properties and multiple potential applications of their EPS is also presented.

Incidencia de infección tuberculosa latente en un estudio de contactos escolares comparando dos puntos de corte de la prueba de tuberculina / Incidence of Latent Tuberculosis Infection in a Study of School Contacts Comparing Two Cut-off Points of the Tuberculin Test

Introducción: El riesgo de infección tuberculosa se asocia a contacto estrecho y prolongado. En las escuelas el contacto diario, aulas con poca ventilación o retraso diagnóstico del caso índice, podrían contribuir al contagio. Objetivo: Conocer la incidencia de infección tuberculosa latente (ITBL) en contactos escolares comparando dos puntos de corte en la prueba de tuberculina (PPD): ≥ 10 mm y ≥ 5 mm. Determinar el grado de cumplimiento en la realización de estudios de catastro y de quimioprofilaxis (QP). Materiales y métodos: Se realizó el análisis retrospectivo de contactos escolares de TB bacilífera, en adolescentes de 12 a 19 años, correspondientes al área programática del Hospital Parmenio Piñero entre febrero 2016 a diciembre 2017. La evaluación incluyó radiografía de tórax (RxT), laboratorio y PPD. Se analizaron 2 puntos de corte de PPD: ≥ 10mm y ≥ 5mm, repitiéndose a los 3 meses en aquellos con resultado negativo. Se indicó QP primaria con isoniazida a todos los contactos, y secundaria en aquellos con PPD+ basal o conversores al tercer mes. Se estimó cumplimiento de QP si tomaban > 80% de la pauta indicada. Resultados: de 373 estudiantes a evaluar, 331 (89%) realizaron los estudios, se diagnosticó TB en 4 (1.2%) a partir de RxT y fueron excluidos. En los 327 restantes, edad promedio 15 ± 1,6 años, hubo 132 (40%) hombres. La PPD basal fue ≥ 10 mm en 20 (6.1%) casos, siendo más frecuente en el grupo de 16-19 años vs 12-15 años: 10.7% vs 3.1%; p = 0,004. No hubo diferencia significativa al considerar el sexo. Realizaron 135 (45%) la segunda PPD encontrándose 3 conversiones (2.2%). Se indicó QP primaria a todos y secundaria a 23, el cumplimiento fue 57% y 26% respectivamente, sin asociación significativa con edad o sexo. Se reportaron 4 eventos adversos (1.2%): polineuritis (n = 2), alergia cutánea e intolerancia digestiva. Con PPD ≥ 5mm dieron positivo 63 (19.3%), siendo más frecuente en varones: 26.5% vs 14.4%, p = 0.006; y en 16-19 vs 12-15 años: 28.2% vs 13.2%; p < 0.001. Con la segunda PPD se observaron 3 conversiones (2,2%). Conclusión: Encontramos un 6,1% de ITBL considerando PPD+ ≥ 10 mm y 19,3% con PPD ≥ 5 mm. El cumplimiento en la realización de la segunda PPD fue bajo, como también en completar el esquema de QP secundaria.

Incidence of Latent Tuberculosis Infection in a Study of School Contacts Comparing Two Cut-off Points of the Tuberculin Test / Incidencia de infección tuberculosa latente en un estudio de contactos escolares comparando dos puntos de corte de la prueba de tuberculina

Introduction: The risk of tuberculosis infection is associated with close and prolonged contact. Daily contact, poorly ventilated classrooms or delay in diagnosing the index case in a school setting could contribute to contagion. Objective: To know the incidence of latent tuberculosis infection (LTBI) in school contacts comparing two cut-off points of the tuberculin test (PPD, Purified Protein Derivative): ≥ 10mm and ≥ 5mm. To determine the degree of compliance with the performance of control and chemoprophylaxis (ChP) studies. Materials and Methods: We carried out a retrospective analysis of bacillary TB school contacts in teenagers between 12 and 19 years old of the Programmatic Area of the Hospital Parmenio Piñero between February 2016 and December 2017. The evaluation included chest x-ray, lab tests and PPD. We analyzed 2 cut-off points of the PPD: ≥ 10mm and ≥ 5mm, and repeated the test after 3 months in cases with negative results. Primary ChP with isoniazid was indicated for all the contacts, and secondary ChP for those with basal PPD+ or conversion at the third month. We considered ChP compliance in cases where patients followed > 80% of the indicated regime. Results: 331 (89%) of 373 students to be evaluated participated in the study. TB was diagnosed in 4 students (1.2%) through chest x-ray, and they were excluded. Within the remaining 327, the mean age was 15 ± 1.6 years, and 132 (40%) were male. The basal PPD was ≥ 10mm in 20 cases (6.1%), being more frequent in the group of 16-19 years versus the 12-15 years: 10.7% vs. 3.1%; p = 0.004. There wasn't any significant difference regarding sex. 135 contacts (45%) did the second PPD, and 3 conversions were found (2.2%). Primary ChP was indicated for everyone, and secondary ChP for 23 contacts, with 75% and 26% compliance respectively, and without any significant association with age or sex. 4 adverse events were reported (1.2%): polineuritis (n=2), skin allergy and food intolerance. 63 contacts (19.3%) were positive PPD, with PPD ≥ 5mm, being more frequent in males: 26.5% vs. 14.4%, p = 0.006; and in 16-19 vs. 12-15 years: 28.2% vs. 13.2%; p < 0.001. With the second PPD we observed 3 conversions (2.2%). Conclusion: We found 6.1% of LTBI considering a PPD+ ≥ 10mm and 19.3% with PPD ≥ 5mm. Compliance with the second PPD and the secondary ChP scheme was low.

Los pacientes en hemodiálisis presentan peor equilibrio postural, que se relaciona con el riesgo de caídas / Haemodialysis patients have worse postural balance with an associated risk of falls

INTRODUCCIÓN: El equilibrio postural es el resultado de una compleja interacción de aferencias sensoriales que nos mantiene erguidos. Los pacientes en hemodiálisis presentan alteraciones que pueden generar inestabilidad postural y riesgo de caídas. Nuestro objetivo es analizar, mediante una plataforma de fuerzas, la estabilidad postural en pacientes hemodializados y su relación con el riesgo de caídas. MATERIAL Y MÉTODOS: Se realizó un estudio prospectivo transversal. El balanceo postural se registró mediante una plataforma de fuerzas en los pacientes prevalentes en hemodiálisis. Se recogen datos epidemiológicos, de diálisis, analíticos y de tratamiento. La incidencia de caídas fue registrada durante los 6 meses siguientes a las pruebas. El análisis de la estabilidad postural se realizó con una plataforma portátil de galgas extensiométricas (AMTI AccuGait®) y una unidad de software específico para estabilometría (programa Balance Trainer®). Se determinan 31 parámetros de equilibrio; las variables de equilibrio utilizadas son: Area 95, AreaEffect, VyMax, Xrange y Yrange. Los estudios de estabilometría se realizan en 3 situaciones: con los ojos abiertos, con los ojos cerrados y mientras el paciente realiza una tarea simultánea. Se realiza un estudio al iniciar la sesión de diálisis y el segundo, al terminar. La estabilometría en condiciones semejantes se mide en un grupo control. RESULTADOS: Se estudian 32 pacientes, con una edad media de 68 años; 20 hombres y 12 mujeres. Su peso medio es de 74 kg y el IMC, de 27,6 kg/m2. En los controles no hay diferencias significativas en la estabilometría entre las 3 situaciones estudiadas. Los pacientes con los ojos cerrados, pre y poshemodiálisis, presentan más desequilibrio, con diferencias significativas con el resto de las situaciones y los controles. Después de la sesión de hemodiálisis se observa un aumento significativo de la inestabilidad. Se observa mayor inestabilidad en los 13 pacientes diabéticos (p < 0,05). Los 4 pacientes con hiponatremia (Na < 136 mmol/L) presentaban peor equilibrio en la situación de tarea simultánea (p= 0,038). Varios fármacos, como la insulina (p = 0,022), los antiagregantes (p = 0,036) y los betabloqueantes (p = 0,029), se relacionaban con el desequilibrio. Los 10 pacientes que sufrieron caídas presentaban mayor desequilibrio, Yrange, Xrange, Area 95 y AreaEffect, pre y poshemodiálisis (p < 0,05) que los que no tuvieron caídas. CONCLUSIONES: Los pacientes en hemodiálisis presentan alteraciones que pueden generar inestabilidad postural y riesgo de caídas. Programas de prevención que incluyan ejercicios específicos para mejorar el equilibrio podrían ser beneficiosos, reduciendo el riesgo de caídas en esta población

INTRODUCTION: Postural balance is the result of a complex interaction of sensory input which keeps us upright. Haemodialysis patients have alterations which can lead to postural instability and a risk of falls. Our objective was to analyse postural stability and its relationship with the risk of falls in haemodialysis patients using a force platform. MATERIAL AND METHODS: This was a prospective cross-sectional study. Postural balance was recorded using a force platform in prevalent haemodialysis patients. We collected epidemiological, dialysis, analytical and treatment data. The incidence of falls was recorded over the 6 months following the tests. The postural stability analysis was performed with a portable strain gauge platform (AMTI AccuGait®) and a specific software unit for stabilometry (Balance Trainer® program). We measured 31 balance parameters; the balance variables used were: Area95; AreaEffect; VyMax; Xrange and Yrange. The stabilometry studies were performed in 3 situations: with eyes open; with eyes closed; and with the patient performing a simultaneous task. We performed one study at the start of the dialysis session, and a second study at the end. Stabilometry was measured in a control group under similar conditions. RESULTS: We studied 32 patients with a mean age of 68 years old; of this group, 20 subjects were male and 12 were female. Their mean weight was 74kg, with a mean BMI of 27.6kg/m2. In the controls, there were no significant differences in the stabilometry between the 3 situations studied. Both pre- and post-haemodialysis, patients with closed eyes showed greater imbalance, and there were significant differences with the other situations and controls. We found a significant increase in instability after the haemodialysis session, and greater instability in the 13 patients with diabetes (P < .05). The 4 patients with hyponatraemia (Na < 136 mmol/l) had worse balance in the simultaneous task situation (P = .038). Various drugs, such as insulin (P = .022), antiplatelet agents (P =.036) and beta-blockers (P = .029), were associated with imbalance. The 10 patients who suffered falls had greater imbalance, Yrange, Xrange, Area 95 and AreaEffect, both pre- and post-haemodialysis (P < .05) than those without falls. CONCLUSIONS: Haemodialysis patients have alterations which can lead to postural instability and a risk of falls. Prevention programmes which include specific exercises to improve balance could be beneficial in reducing the risk of falls in this population

La hipomagnesemia en hemodiálisis se asocia a mayor riesgo de mortalidad: su relación con el líquido de diálisis / Hypomagnesaemia in haemodialysis is associated with increased mortality risk: its relationship with dialysis fluid

La hipomagnesemia en hemodiálisis (HD) se asocia a mayor riesgo de mortalidad: su relación con el líquido de diálisis (LD). INTRODUCCIÓN: Concentraciones bajas de magnesio (Mg) en sangre se han relacionado con el desarrollo de diabetes, hipertensión arterial, arritmias, calcificaciones vasculares y con mayor riesgo de muerte, en población general y en hemodiálisis. La composición del LD y su concentración de Mg es uno de los principales determinantes de la magnesemia en los pacientes en HD. OBJETIVO: Estudiar las concentraciones de magnesio en los pacientes en HD, su valor predictivo de mortalidad y qué factores se asocian a la hipomagnesemia y mortalidad en HD. MÉTODOS: Estudio retrospectivo de una cohorte de pacientes prevalentes en HD seguidos 2 años. Cada 6 meses se determina el Mg sérico. En el análisis se utiliza el Mg inicial y el medio de cada paciente, comparando los pacientes con Mg por debajo de la media, 2,1mg/dl, con los que están por encima. Durante el seguimiento se han utilizado 3 tipos de LD: tipo 1, magnesio de 0,5 mmol/l y tipo 3, Mg 0,37 mmol/l ambos con acetato y tipo 2, 0,5 mmol/l de Mg con citrato. RESULTADOS: Se han incluido en el estudio 137 pacientes en hemodiálisis, 72 hombres y 65 mujeres, con una edad media de 67(15) [26-95] años. Cincuenta y siete pacientes eran diabéticos y 70 pacientes estaban en hemodiafiltración en línea (HDF-OL) y 67 en hemodiálisis de alto flujo (HD-HF). El Mg medio de los 93 pacientes con LD tipo 1 era: 2,18(0,37) mg/dl, en 27 con el tipo 3: 2,02 (0,42) mg/dl y los 17 con tipo 2: 1,84 (0,24)mg/dl (p = 0,01). El Mg se relaciona de forma directa significativa con el P y con la albúmina. Después de un seguimiento medio de 16,6(8,9)[3-24] meses, 77 seguían activos, 24 habían fallecido y 36 se habían trasplantado o trasladado. Los pacientes con un Mg superior a 2,1mg/dl tienen una supervivencia mayor, p = 0,008. La supervivencia de los pacientes con los tres tipos de LD no difería significativamente, Log-Rank, p = 0,424. Corregido por la magnesemia, los pacientes con LD con citrato tienen mejor supervivencia, p = 0,009. En el análisis de regresión de COX se observa cómo la edad, albúmina sérica, Mg, técnica de diálisis y tipo de LD tienen valor predictivo de mortalidad independiente. CONCLUSIONES: Los magnesios séricos bajos respecto a los altos se asocian a mayor riesgo de mortalidad. El tipo de LD influye en la concentración de Mg y en el riesgo de muerte

Hypomagnesaemia in haemodialysis (HD) is associated with increased mortality risk: its relationship with dialysis fluid (DF). INTRODUCTION: Low concentrations of magnesium (Mg) in blood have been linked to the development of diabetes, hypertension, arrhythmias, vascular calcifications and an increased risk of death in the general population and in haemodialysis patients. The composition of the dialysis fluid in terms of its magnesium concentration is one of the main determinants of magnesium in haemodialysis patients. OBJECTIVE: To study magnesium concentrations in haemodialysis patients, their predictive mortality rate and what factors are associated with hypomagnesaemia and mortality in haemodialysis. METHODS: Retrospective study of a cohort of prevalent haemodialysis patients followed up for two years. Serum magnesium was measured every six months. The analysis used the initial and average magnesium values for each patient, comparing patients with magnesium below the mean (2.1mg/dl) with those with magnesium above the mean. During the follow-up, three types of dialysis fluid were used: type 1, magnesium 0.5 mmol/l; type 3, magnesium 0.37 mmol/l (both with acetate); and type 2, magnesium 0.5 mmol/l with citrate. RESULTS: We included 137 haemodialysis patients in the study, of which 72 were male and 65 were female, with a mean age of 67 (15) [26-95] years old. Of this group, 57 patients were diabetic, 70 were on online haemodiafiltration (OL-HDF) and 67 were on high-flow haemodialysis (HF-HD). The mean magnesium of the 93 patients with dialysis fluid type 1 was 2.18 (0.37) mg/dl. In the 27 patients with dialysis fluid type 3 it was 2.02 (0.42) mg/dl. And in the 17 with dialysis fluid type 2 it was 1.84 (0.24) mg/dl (p=.01). There was a pronounced direct relationship between Mg and P and albumin. After a mean follow-up of 16.6 (8.9) [3-24] months, 77 remained active, 24 had died and 36 had been transplanted or transferred. Patients with magnesium above than 2.1mg/dl had a longer survival (p=.008). The survival of patients with the three types of dialysis fluid did not differ significantly (Log-Rank, p=.424). Corrected for blood magnesium, patients with dialysis fluid with citrate have better survival (p=.009). The COX regression analysis shows how age, serum albumin, magnesium, dialysis technique and type of dialysis fluid have an independent predictive mortality rate. CONCLUSIONS: Low serum magnesium levels have a greater association with an increased risk of mortality compared to high levels. The type of dialysis fluid affects the magnesium concentration and the risk of death

Haemodialysis patients have worse postural balance with an associated risk of falls. / Los pacientes en hemodiálisis presentan peor equilibrio postural, que se relaciona con el riesgo de caídas.

INTRODUCTION: Postural balance is the result of a complex interaction of sensory input which keeps us upright. Haemodialysis patients have alterations which can lead to postural instability and a risk of falls. Our objective was to analyse postural stability and its relationship with the risk of falls in haemodialysis patients using a force platform. MATERIAL AND METHODS: This was a prospective cross-sectional study. Postural balance was recorded using a force platform in prevalent haemodialysis patients. We collected epidemiological, dialysis, analytical and treatment data. The incidence of falls was recorded over the 6 months following the tests. The postural stability analysis was performed with a portable strain gauge platform (AMTI AccuGait®) and a specific software unit for stabilometry (Balance Trainer® program). We measured 31 balance parameters; the balance variables used were: Area95; AreaEffect; VyMax; Xrange and Yrange. The stabilometry studies were performed in 3 situations: with eyes open; with eyes closed; and with the patient performing a simultaneous task. We performed one study at the start of the dialysis session, and a second study at the end. Stabilometry was measured in a control group under similar conditions. RESULTS: We studied 32 patients with a mean age of 68 years old; of this group, 20 subjects were male and 12 were female. Their mean weight was 74kg, with a mean BMI of 27.6kg/m2. In the controls, there were no significant differences in the stabilometry between the 3 situations studied. Both pre- and post-haemodialysis, patients with closed eyes showed greater imbalance, and there were significant differences with the other situations and controls. We found a significant increase in instability after the haemodialysis session, and greater instability in the 13 patients with diabetes (P<.05). The 4 patients with hyponatraemia (Na<136mmol/l) had worse balance in the simultaneous task situation (P=.038). Various drugs, such as insulin (P=.022), antiplatelet agents (P=.036) and beta-blockers (P=.029), were associated with imbalance. The 10 patients who suffered falls had greater imbalance, Yrange, Xrange, Area95 and AreaEffect, both pre- and post-haemodialysis (P<.05) than those without falls. CONCLUSIONS: Haemodialysis patients have alterations which can lead to postural instability and a risk of falls. Prevention programmes which include specific exercises to improve balance could be beneficial in reducing the risk of falls in this population.

Hypomagnesaemia in haemodialysis is associated with increased mortality risk: its relationship with dialysis fluid. / La hipomagnesemia en hemodiálisis se asocia a mayor riesgo de mortalidad: su relación con el líquido de diálisis.

Hypomagnesaemia in haemodialysis (HD) is associated with increased mortality risk: its relationship with dialysis fluid (DF). INTRODUCTION: Low concentrations of magnesium (Mg) in blood have been linked to the development of diabetes, hypertension, arrhythmias, vascular calcifications and an increased risk of death in the general population and in haemodialysis patients. The composition of the dialysis fluid in terms of its magnesium concentration is one of the main determinants of magnesium in haemodialysis patients. OBJECTIVE: To study magnesium concentrations in haemodialysis patients, their predictive mortality rate and what factors are associated with hypomagnesaemia and mortality in haemodialysis. METHODS: Retrospective study of a cohort of prevalent haemodialysis patients followed up for two years. Serum magnesium was measured every six months. The analysis used the initial and average magnesium values for each patient, comparing patients with magnesium below the mean (2.1mg/dl) with those with magnesium above the mean. During the follow-up, three types of dialysis fluid were used: type 1, magnesium 0.5 mmol/l; type 3, magnesium 0.37 mmol/l (both with acetate); and type 2, magnesium 0.5 mmol/l with citrate. RESULTS: We included 137 haemodialysis patients in the study, of which 72 were male and 65 were female, with a mean age of 67 (15) [26-95] years old. Of this group, 57 patients were diabetic, 70 were on online haemodiafiltration (OL-HDF) and 67 were on high-flow haemodialysis (HF-HD). The mean magnesium of the 93 patients with dialysis fluid type 1 was 2.18 (0.37) mg/dl. In the 27 patients with dialysis fluid type 3 it was 2.02 (0.42) mg/dl. And in the 17 with dialysis fluid type 2 it was 1.84 (0.24) mg/dl (p=.01). There was a pronounced direct relationship between Mg and P and albumin. After a mean follow-up of 16.6 (8.9) [3-24] months, 77 remained active, 24 had died and 36 had been transplanted or transferred. Patients with magnesium above than 2.1mg/dl had a longer survival (p=.008). The survival of patients with the three types of dialysis fluid did not differ significantly (Log-Rank, p=.424). Corrected for blood magnesium, patients with dialysis fluid with citrate have better survival (p=.009). The COX regression analysis shows how age, serum albumin, magnesium, dialysis technique and type of dialysis fluid have an independent predictive mortality rate. CONCLUSIONS: Low serum magnesium levels have a greater association with an increased risk of mortality compared to high levels. The type of dialysis fluid affects the magnesium concentration and the risk of death.

[High prevalence of asymptomatic COVID-19 in haemodialysis: learning day by day in the first month of the COVID-19 pandemic]. / Alta prevalencia de COVID-19 asintomático en hemodiálisis. Aprendiendo día a día el primer mes de pandemia de COVID-19.

Dialysis patients are a risk group for SARS-CoV-2 infection and possibly further complications, but we have little information. The aim of this paper is to describe the experience of the first month of the SARS-CoV-2 pandemic in a hospital haemodialysis (HD) unit serving the district of Madrid with the second highest incidence of COVID-19 (almost 1,000 patients in 100,000h). In the form of a diary, we present the actions undertaken, the incidence of COVID-19 in patients and health staff, some clinical characteristics and the results of screening all the patients in the unit. We started with 90 patients on HD: 37 (41.1%) had COVID-19, of whom 17 (45.9%) were diagnosed through symptoms detected in triage or during the session, and 15 (40.5%) through subsequent screening of those who, until that time, had not undergone SARS-CoV-2 PCR testing. Fever was the most frequent symptom, 50% had lymphopenia and 18.4% <95% O2 saturation. Sixteen (43.2%) patients required hospital admission and 6 (16.2%) died. We found a cluster of infection per shift and also among those using public transport. In terms of staff, of the 44 people involved, 15 (34%) had compatible symptoms, 4 (9%) were confirmed as SARS-CoV-2 PCR cases by occupational health, 9 (20%) required some period of sick leave, temporary disability to work (ILT), and 5 were considered likely cases. CONCLUSIONS: We detected a high prevalence of COVID-19 with a high percentage detected by screening; hence the need for proactive diagnosis to stop the pandemic. Most cases are managed as outpatients, however severe symptoms are also appearing and mortality to date is 16.2%. In terms of staff, 20% have required sick leave in relation to COVID-19.

Use of Human Umbilical Cord and Its Byproducts in Tissue Regeneration.

The fresh or cryopreserved human umbilical cord (HUC) and its byproducts, such as cells and extracts, have different uses in tissue regeneration. Defining what HUC byproduct is more effective in a particular application is a challenge. Furthermore, the methods of isolation, culture and preservation, may affect cell viability and regenerative properties. In this article, we review the HUC and its byproducts' applications in research and clinical practice. We present our results of successful use of HUC as a patch to treat gastroschisis and its potential to be applied in other conditions. Our in vitro results show an increase in proliferation and migration of human fibroblasts by using an acellular HUC extract. Our goal is to promote standardization of procedures and point out that applications of HUC and its byproducts, as well as the resulting advances in regenerative medicine, will depend on rigorous quality control and on more research in this area.

Physicochemical characterization and emulsifying properties of a novel exopolysaccharide produced by haloarchaeon Haloferax mucosum.

The physicochemical characterization and emulsifying functional properties of a novel exopolysaccharide (EPS) produced by haloarchaea Haloferax mucosum (DSM 27191) were investigated. This biopolymer has a high molecular weight of 152 kDa and important protein content of 10%. Different culture media compositions were investigated taking the ATCC 2185 medium as a base and supplementing with varying concentrations of yeast extract and glucose or sucrose as carbon sources to produce the EPS in a liquid medium. The highest EPS production (7.15 ±â€¯0.44 g/L) was obtained at 96 h. EPS aqueous dispersions showed a non-Newtonian rheological behavior which was well fitted to the Cross equation. The EPS (at 0.32% w/w) was capable of stabilizing water-in-oil emulsions with different nonpolar solvents, including n-hexane, kerosene, chloroform, castor oil and mineral oil. EPS retained its emulsifying activity after to be incubated for one hour in a wide range of temperatures (25, 40, 70 and 100 °C), pH (4, 6.5, 7 and 12) and NaCl concentrations (0, 2.0 and 4.0 M). The viscoelastic behavior and stability of hexane-in-water emulsion were examined through oscillatory shear measurements.

Environmental assessment and historic erosion calculation of abandoned mine tailings from a semi-arid zone of northwestern Mexico: insights from geochemistry and unmanned aerial vehicles.

Mining is known as one of the primary economic activities where exploitation of minerals and other materials have become essential for human development. However, this activity may represent a risk to the environment, starting from deforestation and ending with production of residues that might contain potentially toxic elements. Tailing deposits from historical mining are an example of waste that may represent an environmental concern when abandoned and exposed to environmental conditions. The town of Nacozari de Garcia, in northwestern Mexico, has three abandoned mine tailings (locally known as tailings I, II, and III) located around the urban area that represent important sources of dust and pollution. Images obtained using unmanned aerial vehicles (UAV) in conjunction with geochemical data are used to assess historic erosion calculation and pollution considering contamination and hazard indexes in tailings II and III. Digital elevation models of abandoned tailings were obtained using photogrammetry with UAV. A total of 37 surficial samples were collected from mine tailings to determine elemental concentrations (As, Cu, Pb, W, Zn) using portable X-ray fluorescence. Higher concentrations were found on samples from mine tailing II. Average concentrations followed the decreasing order of Cu > Zn > W > Pb > As for tailing II, whereas decreasing order of Cu > Zn > W > As > Pb was found for tailing III. Contamination Index (CI) values obtained from tailings II and III represent a low potential of pollution, whereas efflorescent crusts from these tailings represent a high potential of polluting soils and sediments by dust generation. Hazard Average Quotient (HAQ) values on both tailings suggest a very high potential of contamination if fluids infiltrate tailings and interact with surficial water and/or groundwater. Obtained surfaces of mine tailings II and III are 146,216 and 216,689 m2, respectively, which represent around 11% of the urbanized area. A loss mass of 321,675 tons was determined for mine tailing II, whereas 634,062 tons for tailing III, accounting for 0.96 million tons of total eroded mass. Since abandonment, calculated erosion rates of 493 t ha-1 year-1 (tailing II) and 232 t ha-1 year-1 (tailing III) are in agreement with those determined in other mining areas. CI and HAQ indexes provide good estimates of pollution associated with abandoned mine tailings from Nacozari de García. Historic erosion determined in these tailings is an environmental concern since eroded material and polluted water have been incorporated into the Moctezuma River, which feeds several villages, whose major activities include agriculture and livestock raising.