1,721,039 research outputs found
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
[Echocardiography in ST-elevation myocardial infarction]
No full text: Echocardiography is an imaging technique of paramount importance for the management of patients with ST-elevation myocardial infarction. In particular, this technique may be useful for diagnosis and is essential for prognosis and to guide drug therapy. The role in the recognition of mechanical complications and in the identification and management of other complications such as pericarditis and left ventricular thrombosis is also crucial. Finally, echocardiography offers important information for the prediction of the arrhythmic risk and the study of left ventricular remodeling. In recent years, speckle-tracking echocardiography has been added to conventional echocardiographic techniques, showing additional value for diagnostic and prognostic indications, but further confirmations are needed
Current Role of Echocardiography in Cardiac Resynchronization Therapy: from Cardiac Mechanics to Flow Dynamics Analysis
No full textThe aim of this review is to summarily explain what LV synchrony, coordination, myocardial work, and flow dynamics are, trying to clarify their advantages and limitations in the treatment of heart failure patients undergoing or with implanted cardiac resynchronization therapy (CRT)
New measures of right ventricle-pulmonary artery coupling in heart failure: An all-cause mortality echocardiographic study
No full textRight ventricle-pulmonary artery coupling (RVPAC) has emerged from pathophysiology to clinical interest for prognostic implication in heart failure and is commonly measured as the ratio between tricuspid annular plane systolic excursion and systolic pulmonary artery pressure (TAPSE/SPAP). However, feasibility of SPAP is limited (down to 60% in trials, and maybe lower in clinical practice). We ought to assess the prognostic value of the TAPSE times pulmonary acceleration time (TAPSE x pACT) product and TAPSE to peak tricuspid regurgitation velocity (TAPSE/TRV) ratio as new alternative measures of RVPAC
[How severe is mitral regurgitation? Possibilities and problems of echocardiographic evaluation in clinical practice]
No full text: Echocardiography is the most commonly used technique for evaluating patients with mitral regurgitation (MR) and estimating MR severity. However, in clinical practice, echocardiographic assessment of MR severity remains challenging in many cases, particularly in patients with forms of intermediate or borderline severity. The main causes are the improper application of the echocardiographic methods for assessment of MR severity and the lack of a validated standardized approach for quantification of various types of MR, including organic and functional MR. In this review, we describe how best to use echocardiography for assessing MR severity in the light of current knowledge and guidelines
Frequency of “Pocket” Hematoma in Patients Receiving Vitamin K Antagonist and Antiplatelet Therapy at the Time of Pacemaker or Cardioverter Defibrillator Implantation (from the POCKET Study)
No full textIn patients undergoing cardiac device implantation, anticoagulant and antiplatelet therapy are associated with an increased risk of pocket hematoma. In case of vitamin K antagonist therapy, a strategy of continued warfarin with no heparin bridge showed a reduction of pocket hematoma. Evidence regarding antiplatelet therapy management is limited. This is a single-center observational study which reflects our systematic approach to the problem. In 2012, we proposed an improved management protocol for anticoagulant and antiplatelet therapy (no-bridge protocol) based on individual thromboembolic risk stratification, noninterruption of oral anticoagulation, no bridge with heparin and elastic adherence compression bandage. The primary end point was the incidence of clinically significant pocket hematoma in the first 30 days after implantation. A total of 1,035 patients were enrolled, of whom 522 received the standard management and 513 the new protocol. The primary end point occurred in 34 patients of the standard management group and 8 patients of the no-bridge protocol group (6.5% vs 1.6%, p <0.001). Patients in the standard management group had a higher incidence of pocket infections (2.3% vs 0.6%, p = 0.02), lead dislodgements (4.8% vs 2.1%, p = 0.02), and thromboembolic events (1.3% vs 0.0%, p <0.01). On a multivariate analysis, heparin and coronary artery disease were independent predictors of pocket hematoma (relative risk [RR] 3.48, 95% confidence interval [CI] 1.55 to 7.83 and RR 2.43, 95% CI 1.25 to 4.76, respectively), whereas the no-bridge protocol was associated with a reduction of pocket hematoma (RR 0.33, 95% CI 0.14 to 0.76). New anticoagulant and antiplatelet therapy management protocol was associated with a reduced incidence of clinically significant pocket hematomas, thromboembolic events, pocket infections, and lead dislodgements
Implantable cardioverter defibrillator management: An update
No full textImplantable cardioverter defibrillator (ICD) is the cornerstone of primary and secondary prevention of sudden cardiac death. In 35 years of technologic improvement and clinical trials, there has been a continuous increase in implantation rate. Purpose of this review is to point out and discuss every aspect related to actual ICD management, investigating implantation procedure and predischarge care, office and remote monitoring follow-up, diagnostic evaluations, management of patients with suspected therapies or malfunctions, heart failure, surgery, radiotherapy and endoscopic procedures. Also, ICD backface such as infections and other complications will be discussed. Finally, we will focus on interesting future perspectives for this setting of patients
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