1,720,958 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Características clínicas y quirúrgicas de pacientes sometidos a cirugía de válvula mitral en una institución de salud de Barranquilla (Colombia)
Get PDFLas anomalías valvulares cardíacas han aumentado su presentación, en parte debido a los avances en métodos diagnósticos y conocimiento de predecesores etiológicos como desencadenantes de la condición clínica que inicia la probabilidad diagnóstica y seguimiento temprano en pacientes en estadios iniciales de la enfermedad, disminuyendo de esta manera el impacto económico por aumento de la morbimortalidad. Objetivo: describir las características clínicas y quirúrgicas de pacientes sometidos a cirugía de válvula mitral en un centro de referencia del distrito de Barranquilla (Colombia), durante los años 2014 a 2016 Metodología: estudio descriptivo, en el que se revisó de forma retrospectiva las historias clínicas de pacientes con patología mitral que requirieron intervención quirúrgica de tipo plastia, cambio biológico o mecánico, entre los años 2014 y 2016. El análisis de los datos se realizó a través del software SPSS. Resultados: durante el periodo de estudio se realizaron 276 cirugías valvulares en la institución objeto de estudio, de las cuales 98 fueron cirugías sobre válvula mitral; se excluyeron 20 pacientes por presentar historia clínica incompleta. El antecedente clínico más frecuente fue enfermedad coronaria (38,5%), seguido del infarto de miocardio (23,1%); el 20,5% de los pacientes presentaron arritmia tipo fibrilación auricular y la cirugía sobre válvula mitral más realizada fue recambio biológico (42%). Conclusión: las características clínicas y quirúrgicas de los pacientes incluidos en el estudio, corresponden a las descritas en literatura nacional e internacional, por lo que podría tomarse como precedente de presentación y de esta manera ir construyendo una clínica de presentación para la identificación rápida y veraz de los pacientes con alteraciones valvulares, permitiendo su abordaje temprano y disminuyendo la carga económica para el sistema de salud.cardiac valvular abnormalities have increased their presentation, partly due to advances in diagnostic methods and knowledge of etiological predecessors as triggers of the clinical condition that initiates the diagnostic probability and early monitoring in patients in the early stages of the disease, decreasing from In this way the economic impact due to increased morbidity and mortality. Objective: to describe the clinical and surgical characteristics of patients undergoing mitral valve surgery at a reference center in the district of Barranquilla (Colombia), during the years 2014 to 2016 Methodology: descriptive study, in which the stories were retrospectively reviewed clinics of patients with mitral pathology that required surgical intervention of the plasty type, biological or mechanical change, between 2014 and 2016. The data analysis was performed through the SPSS software. Results: during the study period, 276 valvular surgeries were performed in the institution under study, of which 98 were mitral valve surgeries; 20 patients were excluded due to incomplete medical records. The most frequent clinical history was coronary heart disease (38.5%), followed by myocardial infarction (23.1%); 20.5% of the patients presented atrial fibrillation type arrhythmia and the most performed mitral valve surgery was biological replacement (42%). Conclusion: the clinical and surgical characteristics of the patients included in the study correspond to those described in national and international literature, so it could be taken as a presentation precedent and thus build a presentation clinic for rapid and truthful identification. of patients with valvular abnormalities, allowing their early approach and reducing the economic burden for the health system
Valor predictivo de las troponinas para mortalidad intrahospitalaria en adultos con COVID-19 en la Clínica General del Norte durante enero a junio de 2021
Get PDFObjetivo: Determinar el valor predictivo de las troponinas cardíacas para mortalidad intrahospitalaria en adultos hospitalizados con COVID-19 durante enero a junio de 2021.
Materiales y métodos: Estudio de casos y controles anidado en una cohorte retrospectiva, que incluyó sujetos de 18 años en adelante con diagnóstico confirmado de COVID-19 hospitalizados entre enero y junio de 2021; se describieron las variables demográficas y paraclínicas de los pacientes y su relación con la condición al egreso; se estimaron las características operativas (sensibilidad, especificidad y valores predictivos) de las troponinas elevadas frente a la mortalidad.
Resultados: Se incluyeron 358 participantes, de los cuales 47,8% eran mujeres, la edad promedio fue de 65,1+/-14,9 años. Las comorbilidades más frecuentes fueron hipertensión arterial (53,1%), obesidad (31,6%) y diabetes mellitus (21,5%). Todas las variables estudiadas (excepto el sexo) presentaron diferencias estadísticamente significativas (p<0,05) respecto a mortalidad, siendo la elevación de troponinas el principal factor, con un OR de 9,4 (IC95%: 5,5-16,0). Los pacientes con elevación de troponinas presentaron una mortalidad intrahospitalaria mayor (55,6%) frente al grupo sin elevación (11,7%). La sensibilidad y especificidad de este biomarcador fue de 77,9% y 72,7% respectivamente. El valor predictivo positivo de la elevación de troponinas fue de 55,6% y su valor predictivo negativo fue de 88,3% para mortalidad intrahospitalaria.
Conclusión: La elevación de troponinas en los sujetos con COVID-19 tiene una correlación positiva con la mortalidad intrahospitalaria de forma independiente a otras condiciones como grupo etario, comorbilidades o requerimiento de oxigenoterapia. Por otro lado, las troponinas normales tienen un buen valor predictivo negativo que permite predecir mayor probabilidad de supervivencia al egreso.Universidad Libre Seccional Barranquilla -- Facultad de Ciencias de la Salud -- Especialización en Medicina InternaGhio S, Montalto C, Pagnesi M, Lupi L, Cappelletti A, Baldetti L, et al. High troponin levels in patients hospitalized for coronavirus disease 2019: a maker or a marker of prognosis? J Cardiovasc Med (Hagerstown). 2021;22(11):828– 31Objective: To determine the predictive value of cardiac troponins for in-hospital mortality in hospitalized adults with COVID-19 from January to June 2021.
Methods and materials: Cases and controls nested in a retrospective cohort study. It included people with 18 years old and older with a confirmed diagnosis of COVID-19 hospitalized between January and June 2021, the demographic and paraclinical variables of them and their relationship with the final condition of the patient were described. There were estimated sensibility, specificity, and predictive values of high troponins with respect of mortality.
Results: There were included 358 patients, of whom 47.8% were women, and the average age was 65.1+/-14.9 years. The most frequent comorbidities were hypertension (53.1%), obesity (31.6%) and diabetes mellitus (21.5%). All the variables studied (except sex) had statistically significant differences (p<0.05) with mortality, with troponin elevation being the main factor, with an OR of 9.4 (95% CI: 5.5-16.0). Patients with troponin elevation had higher in-hospital mortality (55.6%) compared with the non-elevation group (11.7%). The sensitivity and specificity of this biomarker was 77.9% and 72.7% respectively. The positive predictive value of troponin elevation was 55.6% and its negative predictive value was 88.3% for in-hospital mortality.
Conclusion: Troponin elevation in patients with COVID-19 has a positive correlation with in-hospital mortality independently of other conditions such as age, comorbidities, or oxygen therapy requirement. On the other hand, normal troponins have a good negative predictive value that allows predicting a greater probability of survival at discharge
Enfoque actual del tratamiento farmacológico del síndrome coronario agudo sin elevación del segmento st. de la fisiopatología al manejo
Get PDFLos síndromes coronarios agudos son un problema mayor de salud pública en todo el mundo. El síndrome coronario agudo (SCA) incluye infarto agudo de miocardio (IAM), con o sin elevación del ST y la angina inestable. La incidencia anual de IAM sin elevación del segmento ST es 565.000 nuevos eventos y 300.000 ataques recurrentes cada año. Los factores de riesgo para presentar síndromes coronarios agudos incluyen: tabaquismo, niveles elevados de lípidos séricos, hipertensión arterial, diabetes mellitus, obesidad mórbida, sedentarismo, bajo consumo diario de frutas y vegetales, consumo problemático de alcohol e índice psicosocial. La evaluación inicial de un SCA SEST debe enfocarse en el dolor torácico, signos y síntomas asociados y factores de riesgo para SCA. Los marcadores biológicos de lesión miocárdica han evolucionado en la actualidad para una mejor precisión del abordaje diagnóstico y aportan datos para el pronóstico de los pacientes. El manejo actual de las nuevas drogas utilizadas mejora el pronóstico, disminuyen la mortalidad y mejoran la calidad de vida de los pacientes.
Esta revisión bibliográfica se realizó con el propósito de actualizar los conocimientos sobre la fisiopatología el diagnóstico y el tratamiento del síndrome coronario agudo sin elevación del ST
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
