1,721,076 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
What Did We Learn about VADs in 2023?
Get PDFThis is our 10th annual literature review on mechanical circulatory support (MCS) devices. All of our previous reports were well received by the readers.1-9
In this paper, we summarized the most interesting and important, from our standpoint, publications from 2023. There may be some slight overlap with the end of 2022, because some papers were published online first, and the year of publication changed when they became available in print.
For the seventh time this year, we wrote a section on extracorporeal membrane oxygenation (ECMO), which primarily addresses new developments in veno-arterial ECMO.
Readers who wish to supplement this review, argue with the author’s statements, or express their opinions are encouraged to do so by sending letters to the editor at [email protected]
Inotropes Are Not Linked to Increased Mortality in Heart Failure
Get PDFHow to use inotropes is one of the most controversial topics in the management of heart failure. While most clinicians use these drugs, and recognize the state of inotrope dependency, current guidelines recommend them onlu as a bridge or palliation. Thus, inotropes are considered either neutral or detrimental in terms of outcomes. Meanwhile, properly designed randomized clinical trials testing the outcomes on inotropes, have never been performed and it is unlikely that they will ever be attempted. These trials would require randomizing patients with advanced heart failure, low output syndrome, and impaired end-organ perfusion into groups that received or not received inotropes, or received inotropes or placebo. Many physicians would consider this design unethical so the trials would be challenging to implement. But if it is unethical to deny inotropes to this subset of patients, we have to admit that inotropes do not only improve quality of life, but prolong it, or decrease mortality. Otherwise, we consider it unethical to deny the medication which increases mortality.
In this review, we analyze the current evidence relating to inotropes and outcomes. We demonstrate that the original trials were performed with agents that are no longer in use, or on patients without an indication for inotropes, or at a time before automatic cardio-defibrillators were recommended for primary prevention. We conclude that current guidelines for inotropes are misleading in their interpretation of outcomes in patients with advanced heart failure. The guidelines should be revised to adequately reflect the evidence
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
What Did We Learn about VADs in 2018?
Get PDFThis is our 6th annual literature review on mechanical circulatory support (MCS) devices.
Our previous reports for 2014, 2015, 2016, 2017, 2018 were published as open access articles and were well received by the readers. In this paper, we summarize the most interesting and important, from our standpoint, publications from 2019. As we have done for the past two years, a section on extracorporeal membrane oxygenation (ECMO) is included and primarily addresses new developments in veno-arterial ECMO use
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
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