Short-Chain Fatty-Acid-Producing Bacteria: Key Components of the Human Gut Microbiota.

Short-chain fatty acids (SCFAs) play a key role in health and disease, as they regulate gut homeostasis and their deficiency is involved in the pathogenesis of several disorders, including inflammatory bowel diseases, colorectal cancer, and cardiometabolic disorders. SCFAs are metabolites of specific bacterial taxa of the human gut microbiota, and their production is influenced by specific foods or food supplements, mainly prebiotics, by the direct fostering of these taxa. This Review provides an overview of SCFAs' roles and functions, and of SCFA-producing bacteria, from their microbiological characteristics and taxonomy to the biochemical process that lead to the release of SCFAs. Moreover, we will describe the potential therapeutic approaches to boost the levels of SCFAs in the human gut and treat different related diseases.

Trauma center funding: time for an update.

BACKGROUND: Uncompensated care (UC) is healthcare provided with no payment from the patient or an insurance provider. UC directly contributes to escalating healthcare costs in the USA and potentially impacts patient care. In Texas, there has been a steady increase in the number of trauma centers and UC volumes without an increase in trauma funding of UC. The method of calculating UC trauma funds in Texas is imprecise as it is driven by Medicaid volumes and not actual trauma care costs. METHODS: Five years of annual trauma UC disbursement reports from the Texas Department of State Health Services were used to determine changes in UC economic considerations for level I, II, and III trauma centers in the largest urban trauma service areas (TSAs). Data for UC costs, compensation, and TSA demographics were used to assess variations. Statistical significance was determined using a Kruskal-Wallis test with Dunn's pairwise comparison post-hoc analysis and logistic regression. RESULTS: TSA-E (Dallas-Fort Worth area) has 33% of the level I trauma centers in Texas (n=6) and yet serves only 27% of the total state population across 14 metropolitan and 5 non-metropolitan counties. Since 2015, TSA-E has shown higher UC costs (p<0.02) and lower reimbursement (p<0.01) than the second largest urban hub, TSA-Q (Houston area). TSA-E level I trauma centers trended towards decreased UC reimbursements. DISCUSSION: The unregulated expansion of trauma centers in Texas has led to an unprecedented increase in hospitals participating in trauma care. The unbalanced allocation of UC funding could lead to further economic instability, compromise resource allocation, and negatively impact patient care in an already fragile healthcare environment. LEVEL OF EVIDENCE: Level IV; Retrospective economic analysis and evaluation.

Preoperative oral antibiotics and surgical-site infections in colon surgery (ORALEV): a multicentre, single-blind, pragmatic, randomised controlled trial.

BACKGROUND: Previous studies have found that mechanical bowel preparation with oral antibiotics can reduce the incidence of surgical-site infections, but no randomised controlled trial has assessed oral antibiotics alone without mechanical bowel preparation. The aim of this study was to determine whether prophylaxis with oral antibiotics the day before elective colon surgery affects the incidence of postoperative surgical-site infections. METHODS: In this multicentre, pragmatic, randomised controlled trial (ORALEV), patients undergoing colon surgery were recruited from five major hospitals in Spain and 47 colorectal surgeons at these hospitals participated. Patients were eligible for inclusion if they were diagnosed with neoplasia or diverticular disease and if a partial colon resection or total colectomy was indicated. Participants were randomly assigned (1:1) using online randomisation tables to either administration of oral antibiotics the day before surgery (experimental group) or no administration of oral antibiotics before surgery (control group). For the experimental group, ciprofloxacin 750 mg was given every 12 h (two doses at 1200 h and 0000 h) and metronidazole 250 mg every 8 h (three doses at 1200 h, 1800 h, and 0000 h) the day before surgery. All patients were given intravenous cefuroxime 1·5 g and metronidazole 1 g at the time of anaesthetic induction. The primary outcome was incidence of surgical-site infections. Patients were followed up for 1 month after surgery and all postsurgical complications were registered. This study was registered with EudraCT, 2014-002345-21, and ClinicalTrials.gov, NCT02505581, and is closed to accrual. FINDINGS: Between May 2, 2015, and April 15, 2017, we assessed 582 patients for eligibility, of whom 565 were eligible and randomly assigned to receive either no oral antibiotics (n=282) or oral antibiotics (n=282) before surgery. 13 participants in the control group and 16 in the experimental group were subsequently excluded; 269 participants in the control group and 267 in the experimental group received their assigned intervention. The incidence of surgical-site infections in the control group (30 [11%] of 269) was significantly higher than in the experimental group (13 [5%] of 267; χ2 test p=0·013). Oral antibiotics were associated with a significant reduction in the risk of surgical-site infections compared with no oral antibiotics (odds ratio 0·41, 95% CI 0·20-0·80; p=0·008). More complications (including surgical-site infections) were observed in the control group than in the experimental group (76 [28%] vs 51 [19%]; p=0·017), although there was no difference in severity as assessed by Clavien-Dindo score. No differences were noted between groups in terms of local complications, surgical complications, or medical complications that were not related to septic complications. INTERPRETATION: The administration of oral antibiotics as prophylaxis the day before colon surgery significantly reduces the incidence of surgical-site infections without mechanical bowel preparation and should be routinely adopted before elective colon surgery. FUNDING: Fundación Asociación Española de Coloproctología.

La cultura y el estudio de los referentes teóricos en ciencias sociales / The culture and the study of theoretical framework in social sciences

RESUMEN La pesquisa tuvo como objetivo precisar las prácticas que caracterizan la elaboración de los fundamentos teóricos en las investigaciones en ciencias pedagógicas. A partir de una muestra de artículos publicados en revistas científico pedagógicas certificadas, se evaluó la actualidad de la bibliografía empleada, su correspondencia con el objeto de la investigación, las relaciones de contenido por la naturaleza de los referentes (repetitivos, desarrolladores o contrastantes), el lugar de la cultura en el análisis de esos referentes, y la capacidad del autor para captar esencias. El resultado alcanzado fue la precisión de las tendencias predominantes en la elaboración del marco teórico, frecuentemente caracterizada por la dispersión conceptual y teórica.

ABSTRACT The study was aimed at identifying the educational researchers' current practice in constructing theoretical framework. By comparing a sample of articles published in well-established education scientific journals, the authors appraise the update character or references, its correspondence to the research objective, the redundant, developmental or contrasting character of references included the place of culture in the framework construction and the researchers' capacity to figure out salient points and conclusions. The main finding is the identification of current trends in framework construction mainly characterized by a scattering of concepts and theories.

Corregir errores y estimular la comunicación oral en lengua extranjera / Correcting mistakes and encouraging oral communication in foreign languages

En este artículo se presenta un estudio sobre las concepciones que sobre el tratamiento a los errores durante el proceso de retroalimentación en las clases de expresión oral tienen los profesores de Inglés del municipio Florida, para la pesquisa se realizaron entrevistas y se observaron clases que permitieron identificar las principales tendencias en la práctica pedagógica y sus efectos en el aprendizaje de los estudiantes. Se presenta de igual forma un análisis de los procedimientos y técnicas aplicadas por profesionales de otros países y se formulan recomendaciones que pueden contribuir al mejoramiento de la práctica educativa en el contexto cubano.

This paper presents the results of a study conducted among teachers of English of Florida with regard to their conceptions about error correction during the process of feedback in the oral aspects of the lessons in foreign language teaching. Based on the information gathered through interviews and lesson observations, it was possible to identify the main tendencies prevailing in the teaching practice and its effects on students' learning. An analysis of procedures and techniques followed by professionals of other countries is also presented, and recommendations that may contribute to improve teaching practice are made as well.

Competencias informacionales en la formación del profesional / Information competence in professional training

El artículo tiene como objetivo describir las competencias informacionales a desarrollar durante la formación profesional. Se presenta los referentes teóricos a partir del empleo de un enfoque de sistema que supone el análisis y la síntesis, la inducción y la deducción como métodos de investigación, con el propósito de dar conocer los hitos en las universidades y organizaciones internacionales relacionadas. La modelación fue empleada para la construcción de un nuevo proyecto de desarrollo de competencias informacionales desde la perspectiva de la formación profesional universitaria ajustada a las necesidades de la educación superior en Cuba. El nuevo proyecto se configura en tres unidades básicas (acceso, procesamiento y comunicación), con sus respectivos elementos de competencia, saberes esenciales e indicadores para la evaluación del desempeño. El artículo fundamenta la tesis de que el desarrollo de competencias informacionales debe ser sistemáticamente estructurado, planificado y ejecutado como parte integral de la formación curricular en interacción con los contenidos de las disciplinas docentes, bajo la dirección del profesor y la participación protagónica de los profesionales en formación.

The article aims at describing the competence to be developed during professional training. It presents the theoretical referents by means of an approach system that includes synthesis and analysis, induction and deduction as research methods in order to reveal the milestones of information skills development in universities and related international organizations. Modeling was used for the construction of a new skills development project from the perspective of university professional training according to the needs of Higher Education in Cuba. The new project is composed of three basic units (access, processing and communication), with their respective competence elements, essential knowledge and indicators for the evaluation of the performance. The article supports the theory that information development skills must be systematically structured, planned and implemented as an integral part of the curricular training in interaction with the contents of subjects, under the teacher´s guidance and the active participation of profesionals in training.

Geriatric trauma service: a one-year experience.

BACKGROUND: Trauma centers nationwide have been experiencing an increase in their elderly trauma patients because of an ever growing elderly population within the United States. Many studies have demonstrated the physiologic differences between an older trauma patient versus a younger trauma patient. Coupling these differences with their coexisting medical comorbidities, makes caring for this population extremely challenging. To meet these challenges, we organized a geriatric trauma unit specifically designed with a multidisciplinary approach to take a more aggressive stance to the care of the geriatric trauma patient. METHODS: We created a geriatric trauma unit at our Level II trauma facility, called the G-60 unit. This unit opened for admission in August 2009. Inclusion criteria included all trauma patients older than 60 years. Data were abstracted from our G-60 unit from the period of August 2009 to July 2010. We compared these data to a similar patient population (control group) from January 2008 to December 2008. RESULTS: Our Trauma Data Bank yielded 673 patients for the above queried time period. The G-60 group contained 393 patients, while the control group had 280 patients. A decrease was seen among the G-60 group in all categories: average emergency department length of stay (LOS), average emergency department to operating room time, average surgical intensive care unit LOS, and average hospital LOS. A 3.8% mortality rate was found in the G-60 group compared with a 5.7% mortality rate in the control group. Our analysis also showed rate of 0% pneumonia, 1.3% respiratory failure, and 1.5% urinary tract infection in the G-6O group, while the control group had a rate of 1.8% pneumonia, 6.8% respiratory failure, and 3.9% urinary tract infection. CONCLUSION: Our data from the 1-year experience of our G-60 unit show that addressing the specific needs of elderly trauma patients will lead to better outcomes.

Civilian and military trauma: does civilian training prepare surgeons for the battlefield?

The management of trauma patients continues to be a major focus of resident training. The purpose of this review is to compare the mechanism and distribution of injuries in civilian and military trauma and to ascertain whether we are optimally preparing surgeons for the injuries seen on the battlefield. We performed a retrospective 5-year review of all trauma admissions to our urban trauma center (TC). We then compared this data with that recently acquired from Operation Iraqi Freedom (OIF). There were 7732 trauma patients seen during that time at our TC with 9.8 per cent sustaining gunshot wounds. Of those, 26 per cent sustained a gunshot wound to the thorax, and injuries to the abdomen and pelvis were sustained in 28.5 per cent. In total, truncal trauma accounted for 55 per cent of the injuries. Extremity injuries occurred in just 31 per cent. Data from OIF show the mechanism and distribution of injuries to be quite different. Improvised explosive devices accounted for greater than 50 per cent of the injuries in OIF. Truncal injuries accounted for just 14 per cent of the injuries seen and extremity injuries accounted for, a significant, 56 per cent of all the injuries observed. The civilian experience with gunshot wounds often focuses on truncal trauma, yet the military data show a need for knowledge of devastating injuries to the extremity. This divergent experience may be even more salient in the future as the battlefield is brought closer to home through domestic terrorism and the line is blurred between military and civilian trauma.

Out with the old, in with the new: a novel approach to treating pain associated with rib fractures.

BACKGROUND: Rib fractures continue to be a challenging problem from both a pulmonary and analgesia standpoint. As a result, numerous modalities have been used to treat this condition, but none has proven universally available and efficacious. The objective of this pilot study was to assess the efficacy of a novel technique for placing an elastomeric infusion pump (EIP) catheter (On-Q; Lake Forest, CA, USA) in the extrathoracic paraspinous space to create a continuous intercostal nerve block. METHODS: This was a prospective, nonrandomized study conducted in the surgical intensive care unit (SICU) of an urban level II trauma center. We developed a novel technique for placing EIP catheters in the extrathoracic paraspinous space to provide continuous intercostal nerve blockade. We subsequently evaluated 30 consecutive blunt trauma patients with three or more unilateral rib fractures. The catheters were infused with local anesthetic, and the dose was titrated to achieve adequate analgesia. For each patient, preplacement numeric pain scale scores (NPSs) and sustained maximum inspiration (SMI) lung volumes were determined. Sixty minutes following placement of the catheters, the NPS and SMI were repeated. The patients were monitored for any procedural or drug-related complications. RESULTS: The mean age of the patients was 65 years (22-92 years); the mean ISS was 14 (9-16); and the mean number of rib fractures was 4.4 (3-8). Overall, the mean NPS significantly improved (preplacement NPS 9.03, postplacement NPS 3.06; p < 0.05) and was associated with a significant increase in the SMI (preplacement SMI 0.40 L, postplacement SMI 1.1 L; p < 0.05). The catheters remained in place for an average of 98 h (72-146 h), and there were no procedural- or drug-related complications. CONCLUSIONS: These pilot data indicate that the placement of EIP catheters in the extrathoracic paraspinous space may be a safe, viable, and efficacious procedure for ameliorating pain secondary to rib fractures.

[Low mortality rate in an outbreak of Legionnaires' disease: correlation with the cytopathogenity study]. / Baja mortalidad en un brote de enfermedad del legionario: correlación con el estudio de citopatogenicidad.

BACKGROUND: In 2001 an outbreak of Legionnaires' diseases occurred in Murcia, Spain, with one of the lowest known rates of associated mortality. We describe the clinical data of a subgroup of patients, and present the results from molecular and virulence studies to correlate the lower mortality of the overall series with the strain virulence. PATIENTS AND METHODS: A subgroup of 86 patients from the outbreak of Legionnaires'disease was prospectively included. Demographic, risk factors and clinical evolution data were obtained. Moreover, we performed a pulsed field gel electrophoresis and cytopathogenicity assay of the Murcia outbreak that were compared with other unrelated Legionella isolates. RESULTS: Sixty-nine (77.9%) patients were males. The mean age of the patients was 58.2 years (range: 32-87). Smoking was the most frequent risk factor in 62 patients (71.7%) and 61 patients (70.2%) had underlying diseases. Clinical, laboratory and radiological manifestations were compatible with the atypical pneumonia syndrome. The mortality rate was 3.2%. All the clinical L. pneumophila isolates analyzed by PFGE showed the same subtype. When analyzing theses strains together with other Legionella strains, they were included in the group with lower virulence in the cytopathogenicity study. CONCLUSIONS: The most outstanding data in this subgroup of patients were: male-sex, smoking, atypical clinical manifestations and low mortality. The low virulence of this molecular genotype of L. pneumophila may be responsible, in part, for the low mortality observed in the outbreak in Murcia.

Practice management guidelines for the screening of thoracolumbar spine fracture.

BACKGROUND: Fractures to the thoracolumbar spine (TLS) commonly occur because of major trauma mechanisms. In one series, 4.4% of all patients arriving at a Level I trauma center were diagnosed as having TLS fracture. Approximately 19% to 50% of these fractures in the TLS region will be associated with neurologic damage to the spinal cord. To date there are no randomized studies and only a few prospective studies specifically addressing the subject. The Eastern Association for the Surgery of Trauma organization Practice Management Guidelines committee set out to develop an EBM guideline for the diagnosis of TLS fractures. METHODS: A computerized search of the National Library of Medicine and the National Institutes of Health MEDLINE database was undertaken using the PubMed Entrez (www.pubmed.gov) interface. The primary search strategy was developed to retrieve English language articles focusing on diagnostic examination of potential TLS injury published between 1995 and March 2005. Articles were screened based on the following questions. (1) Does a patient who is awake, nonintoxicated, without distracting injuries require radiographic workup or a clinical examination only? (2) Does a patient with a distracting injury, altered mental status, or pain require radiographic examination? (3) Does the obtunded patient require radiographic examination? RESULTS: Sixty-nine articles were identified after the initial screening process, all of which dealt with blunt injury to the TLS, along with clinical, radiographic, fluoroscopic, and magnetic resonance imaging evaluation. From this group, 32 articles were selected. The reviewers identified 27 articles that dealt with the initial evaluation of TLS injury after trauma. CONCLUSION: Computed tomography (CT) scan imaging of the bony spine has advanced with helical and currently multidetector images to allow reformatted axial collimation of images into two-dimensional and three-dimensional images. As a result, bony injuries to the TLS are commonly being identified. Most blunt trauma patients require CT to screen for other injuries. This has allowed the single admitting series of CT scans to also include screening for bony spine injuries. However, all of the publications fail to clearly define the criteria used to decide who gets radiographs or CT scans. No study has carefully conducted long-term follow-up on all of their trauma patients to identify all cases of TLS injury missed in the acute setting.

Video-endoscopia biliar percutánea (VEB): aporte diagnóstico y terapéutico / Percutaneous biliary videoendoscopy (PBVE) for the etiological diagnosis and treatment

Antecedentes: El diagnóstico imagenológico de la estenosis biliar alcanza una sensibilidad del 85 por ciento y una especificidad del 98 por ciento. En cerca del 15 por ciento de las estenosis biliares no se llega al diagnóstico etiológico, lo que conduce a dificultades para proponer terapéuticas o elaborar pronósticos. Objetivo: Evaluar el aporte de la Video-Endoscopia Biliar Percutánea (VEB) para el diagnóstico etiológico de la estenosis biliar cuando fracasan los procedimientos corrientes, previo a la indicación de laparotomía. Lugar de aplicación: Institución privada. Diseño: Análisis retrospectivo de la casuística registrada en una ficha por paciente y volcada en una base de datos. Población: 22 VEB practicadas en 13 pacientes, 8 mujeres y 5 varones, edad promedio 51 años, portadores de ictericia obstructiva de origen incierto e imagenología no concluyente, entre febrero de 1993 y febrero de 2004. Método: Estudio retrospectivo descriptivo. Descripción detallada del instrumental y de la técnica. Resultados: Todos los procedimientos fueron técnicamente exitosos. Se realizaron 22 veces en 13 pacientes. 5 biopsias se hicieron a nivel de la confluencia, 3 en el canal hepático común, 1 en colédoco distal y 4 en anastomosis bilio-digestivas estenosadas. La biopsia informó "maligno" en 5 casos y "benigno" en 8. Hubo un falso negativo, resultando sensibilidad del 92 por ciento y especificidad del 100 por ciento. El endoscopio de 9F fue insuficiente en casi todos los casos, en tanto que el 15F alcanzó el diagnóstico en cada caso. La morbilidad vinculada al procedimiento se tradujo en 2 hemobilias de resolución espontánea. Todos los casos fueron confirmados por cirugía o control alejado, con seguimiento máximo de 9 años y promedio de 24 meses. Conclusiones: La VEB es un procedimiento que alcanza el diagnóstico cuando los métodos clásicos fallan. La técnica es relativamente sencilla, la morbilidad reducida, el costo bajo y los resultados alentadores cuando el algoritmo clásico no consigue diagnóstico de certeza. Permite visión directa de lesiones sin diagnóstico, facilitando la toma de muestras para examen histopatológico. El endoscopio de 15F es el instrumento ideal

Creencias vinculadas al uso del preservativo masculino en adolescentes españoles sexualmente activos / Beliefs linked to the usage of male condom in sexually active spanish teenagers

El objeto de este trabajo es identificar qué creencias sobre el preservativo masculino influyen en su uso. Participan en esta investigación 315 adolescentes activos sexualmente (55.6 por ciento de los hombres y 44,6 porciento de mujeres) con una media de edad de 18 a 27 años

Paralelismo entre las obras de Pedro de Betancur y Bernardino de Obregón / Parallelism between the beneficial sanitary work of Pedro de Betancur and Bernardino

El presente trabajo quiere destacar las ideas y realizaciones de la labor sanitaria desplegada por Pedro de Betancur y Bernardino de Obregón. Sus similitudes son tan notorias, pese a su mutuo desconocimiento, que nuestra hipótesis de trabajo se centra en constatar la dependencia de una respecto de la otra.

This paper wishes to highlight the ideas and relations of the sanitary work done by Pedro de San José and Bernardino de Obregón. Their similarities are noteworthy, although they never new of each other, which forces our working hypothesis to concentrate on evidencing the dependence of one in respect of the other.

Estudios fenológicos en plantas medicinales: XIII / Phenologic studies in medicinal plants: XIII

Se continúa la evaluación fenológica de 10 taxa, algunos introducidos en Cuba por la Estación Experimental "Dr. Juan T. Roig, los que pertenecen a los géneros: Achillea, Ammi, Artemisia, Camelia, Cyrtopodium, Oncidium, Quisqualis, Sthephania y Strophanthus. Todos los taxa mantuvieron las fases reproductivas bien delimitadas cada año, aunque algunas de ellas no produjeron frutos. Los resultados muestran la posibilidad de cultivar en nuestras condiciones especies de alto valor económico

Rabia humana: reporte de tres casos / Human rabies: report of three cases

La rafia es una zoonosis vírica endémica en el Perú. En el año 1996 ocurrieron dos casos en la población asegurada atendida por el Instituto Peruano de Seguridad Social (IPSS), para una tasa de incidencia de 0.03 por cien mil asegurados. Hasta el mes de octubre del año 19997, se han reportado la ocurrencia de tres casos (tasa de incidencia de 0.04 por cien mil asegurados), procedentes de las Gerencias Departamentales de Pucallpa y Junín. Todos los casos notificados en ambos años fallecieron, por lo que la tasa de letalidad fue de 100 por ciento. Este artículo tiene el propósito de contribuir a elevar el nivel de información sobre aspectos clínico-epidemiológicos, de comportamiento y manejo de la rabia humana en el Peró

Estudios fenológicos en plantas medicinales V / Phenologic studies in medicinal plants. V

Se inicia una serie de estudios fenológicos en diferentes plantas medicinales sometidas a cultivos con la creación de colecciones a partir de 1980 en San Antonio de los Baños, La Habana y Topes de Collantes, Sancti Spiritus, por parte de la Estación Experimental "Dr. Juan Tomás Roig" . Este trabajo continúa una serie en la que se ofrecen los resultados de estos estudios, en esta ocasión referido a 21 especies correspondientes a 18 géneros de 15 familias. Se relacionan, como información complementaria, las principales afectaciones micóticas que han presentada dichas especies