1,721,058 research outputs found
Myocardial magnesium content in primary ventricular tachycardia. Relation between myocardial Mg, histology and antiarrhythmic response to Mg infusion.
No full textAneurismi infiammatori localizzati del ventricolo sinistro come causa di aritmie ventricolari a cuore apparentemente sano.
No full textRate-control vs. rhythm-control in patients with atrial fibrillation: a meta-analysis.
No full textAims: To systematically assess the risk/benefit ratio of a rate-control strategy vs. a rhythm-control strategy in patients with first or recurrent atrial fibrillation (AF). Methods and results: We searched Medline, CENTRAL, and other sources up to September 2004 for randomized trials. Individual and pooled random-effect odd ratios (OR) and 95% confidence intervals (CI) [OR (95% CI)] were calculated for the combined endpoint of all cause death and thromboembolic stroke (CEP), major bleeds (intra and extracranial), and systemic embolism. Number needed to treat (NNT) to avoid one CEP and heterogeneity were also assessed. Five studies enrolling 5239 patients with AF compared rate-control vs. rhythm-control. Average follow-up ranged from 1 to 3.5 years. A rate-control strategy compared with a rhythm-control approach was associated with a significantly reduced risk of CEP [OR 0.84 (0.73, 0.98), P = 0.02], and with a trend towards a reduced risk of death [OR 0.87 (0.74, 1.02), P = 0.09] and thromboembolic stroke [OR 0.80 (0.6, 1.07), P = 0.14]. NNT to save one CEP was 50. There was no significant difference in the risk of major bleeds [OR 1.14 (0.9, 1.45), P = 0.28] and systemic embolism [OR 0.93 (0.43, 2.02), P = 0.90]. No significant heterogeneity was found in any of the analyses (P > 0.1). Conclusion: This meta-analysis of 5239 patients with AF indicates that an initial rate-control strategy compared with a rhythm-control one is associated with a better prognosis, thus representing the standard treatment against which to test new therapeutic approaches. © The European Society of Cardiology 2005. All rights reserved
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
Use of video capsule endoscopy in a patient with an implantable cardiac defibrillator
No full textVideo capsule endoscopy (VCE) is a useful diagnostic tool in patients with unknown blood loss, particularly when there is a high suspicion of small bowel disease, but because of its use of radio frequency, it is relatively contraindicated in patients with a cardiac device. We report the case of a patient with an implantable cardiac defibrillator (ICD) who underwent VCE because of anaemia and previous surgery for colorectal cancer. Device interrogations were performed before and after the procedure. No interference between VCE and ICD was found. VCE is feasible and relatively safe in patients with ICDs. © 2006 Oxford University Press
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
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