1,720,973 research outputs found
Angiotensin converting-enzyme inhibitors and candesartan have no effects on atrial fibrillation after cardiac surgery: comment on: Mehmet Ozaydin et al. "Effect of renin-angiotensin aldosterone system blockers on postoperative atrial fibrillation"
No full textThe manuscript is a "Letter to the Editor" concerning the paper: "Ozaydin M, Dede O, Varol E, et al. Effect of renin-angiotensin aldosteron system blockers on postoperative atrial fibrillation. Int J Cardiol 2008; 127: 362-367"
On-pump beating-heart coronary artery bypass grafting in high-risk patients: A systematic review and meta-analysis
No full textBackground
Operative technique for surgical myocardial revascularization in high‐risk patients remains an argument of debate. On‐pump coronary artery bypass graft (CABG) with cardioplegic arrest and off‐pump CABG have intrinsic limitations. The hybrid approach of on‐pump beating‐heart CABG (OPBHC) has been proposed over the years with conflicting results. This systematic review and meta‐analysis intends to summarize the contemporary literature.
Methods
A literature search was conducted through major electronic databases. The systematic review provided a total of 279 articles, of those 17 studies were included in the present study.
Results
Compared with on‐pump CABG, OPBHC patients showed a preoperative higher risk profile but had reduced early mortality (risk ratio [RR], 0.59, 95% CI, 0.36‐0.97) and reduced postoperative stroke (RR, 0.60, 95% CI, 0.39‐0.91). Also, interesting trends towards reduced postoperative intra‐aortic balloon pump use (RR, 0.56, 95% CI, 0.31‐1.01) and myocardial infarction (RR, 0.48, 95% CI, 0.22‐1.07) were observed. Baseline characteristics and postoperative complications were similar between OPBHC and off‐pump CABG, but limited data are available. The risk of incomplete revascularization in OPBHC is lower than off‐pump CABG (RR, 0.53, 95% CI, 0.33‐0.87) but higher than conventional on‐pump CABG (RR, 1.71, 95% CI, 1.23‐2.39).
Conclusion
OPBHC is an effective technique to perform surgical revascularization in high‐risk patients as preventing haemodynamic deterioration and guaranteeing adequate end‐organ perfusion. OPBHC represents an alternative technique to on‐pump and off‐pump CABG, in those cases in which complications deriving from cardioplegic arrest or manipulation of the heart are more likely. For these reasons, OPBHC might be useful in patients with recent myocardial infarction or with left ventricular dysfunction
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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
Full text linkWe 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
Neurological outcomes after on-pump vs off-pump CABG in patients with cerebrovascular disease
No full textThe possible association of off-pump coronary artery bypass graft (CABG) with reduced risk of postoperative stroke and enhanced benefits in high-risk patients support the hypothesis that patients with a positive history of cerebrovascular disease would benefit from off-pump coronary surgery. This study aims to investigate the impact of off-pump CABG on the incidence of postoperative neurologic events in patients with a previous history of cerebrovascular disease
A Nomogram for Predicting Long Length of Stay in The Intensive Care Unit in Patients Undergoing CABG: Results From the Multicenter E-CABG Registry
No full textMany papers evaluated predictive factors for prolonged intensive care unit (ICU) stay after cardiac surgery, but efforts in translating those models in practical clinical tools is lacking. The aim of this study was to build a new nomogram score and test its calibration and discrimination power for predicting a long length of stay in the ICU among patients undergoing coronary artery bypass graft surgery (CABG)
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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