1,721,139 research outputs found
Letter by Bandera et al regarding article, "Value of peak exercise oxygen consumption combined with B-type natriuretic peptide levels for optimal timing of cardiac transplantation"
Full text linkPredictive Value of 6-Min Walk Test Distance Versus Cardiopulmonary Exercise Testing in Systolic Heart Failure Same Value for Different Approaches?
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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
Right Ventricular Pulmonary Hypertension
No full textIn heart failure (HF) syndrome, the development of pulmonary hypertension (PH), right ventricular (RV) dysfunction and failure are ominous prognostic signs. Pathophysiology, clinical interest and targeted therapeutic approaches for left-sided PH and its consequences on RV function have been traditionally confined to advanced HF stages. Community- and population-based studies have clearly indicated that PH is frequent even in HF patients with preserved ejection fraction, and may carry important prognostic implications in normal ageing as well. HF guidelines are inconclusive on both preventive and curative strategies for left-sided PH and its consequences on RV function. The search for new therapeutic opportunities targeted on pulmonary vascular and right heart remodeling are an important challenge for the future
Surgical ventricular restoration : is there any difference in outcome between anterior and posterior remodeling?
No full textThe purpose of this study was to compare the early and long-term outcomes in a consecutive population who underwent surgical ventricular reconstruction (SVR) for either anterior or posterior remodeling.
METHODS:
Among 501 consecutive patients who underwent SVR at our institution between July 2001 and December 2011, 56 patients presented with posterior remodeling (group A; mean age, 65 ± 10 years), whereas anterior remodeling was evident in 445 patients (group B; mean age, 65 ± 9 years). The 2 groups were comparable regarding cardiac risk factors and comorbidities. Patients in group A presented with larger left ventricles, higher left ventricular (LV) cardiac mass, and higher ejection (EF) and stroke volume (p = 0.01) compared with patients in group B. Moderate to severe mitral regurgitation was present in 50% and 25% of patients in groups A and B, respectively (p = 0.01).
RESULTS:
Thirty-day mortality was not significantly different between the 2 groups (5.4% versus 8.3% in groups A and B, respectively; p = 0.32). At logistic regression analysis, only preoperative age, creatinine, and ejection fraction (ACEF) score was an independent predictor of early mortality. Sixteen patients (29%) in group A and 92 patients (21%) in group B died during follow-up (p = 0.12). Kaplan-Meier cumulative survival was comparable between the 2 groups (log-rank p = 0.27). At multivariate Cox regression analysis, preoperative age, advanced New York Heart Association (NYHA) class, preoperative severe mitral regurgitation (MR), and preoperative tricuspid annular plane systolic excursion (TAPSE) score less than 16 were independent predictors of late mortality.
CONCLUSIONS:
Patients presenting with posterior remodeling showed worse clinical signs of angina and congestive heart failure (CHF) and a higher proportion of moderate to severe MR; however in the present experience early and long-term outcomes after SVR seemed to be unaffected by remodeling location
Functional mitral regurgitation in patients with ischemic cardiomyophaty undergoing surgical ventricular restoration for anterior aneurysm: echocardiographic findings and clinical impact.
No full textVariations 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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