1,721,038 research outputs found
The Wolff–Parkinson–White electrocardiogram pattern in athletes: how and when to evaluate the risk for dangerous arrhythmias. The opinion of the paediatric cardiologist
No full text
Transverse bidimensional strain and exercise capacity in patiens late after mustard or senning repair
No full textGoing 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
Transverse strain predicts exercise capacity in systemic right ventricle patients
No full textBackground: Because transposition of great arteries (TGA) patients who underwent atrial switch repair (AS)
remain asymptomatic for decades before development of symptomatic heart failure, there may be some
clinical value to preclinical detection of ventricular dysfunction. Detection of systemic right ventricular (RV)
dysfunction in patients who are asymptomatic may prompt early initiation of heart failure therapy and more
frequent clinical follow-up.
Aim: The objective of this study was to characterize longitudinal and transverse systolic function of the
systemic RV using two-dimensional (2D) strain in patients with TGA after AS repair and to correlate these
parameters with their exercise capacity.
Methods: The study population consisted of 26 patients (20±6 years) with TGA after AS operation.
Conventional echocardiography and bidimensional strain were performed on consecutive patients reporting
to the out patient congenital heart disease clinic. Twenty-four healthy, age-matched individuals were used as
control subjects. Analysis was performed on the non-systemic RVs of the control group. All the studied
patients underwent treadmill exercise testing according to the Bruce II protocol.
Results: RV longitudinal 2D-strain in controls showed a base to apex gradient, while in patients was
homogeneously reduced. Also RV transverse strain (i.e the radial deformation assessed by the apical 4
chamber view) showed a base to apex gradient in controls, while in patients was significantly increased in
the mid and apical segments. In the systemic RV free wall, transverse strain was greater than longitudinal
strain (pb0.0001), opposite from findings in the normal RV free wall (p: NS). Of interest, in AS-TGA patients
we found a strong correlation between RV transverse 2D strain and exercise capacity (pb0.0001; R: 0.80). At
multivariate analysis (including age, degree of tricuspid regurgitation, TAPSE, RV area fractional change, RV
visually estimated ejection fraction, RV global longitudinal strain and RV global transverse strain) the best
predictor of exercise capacity in AS-TGA patients was transverse 2D strain (pb0.0001).
Conclusions: In AS-TGA patients there is a shift from a predominant longitudinal shortening to a predominant
transverse thickening. The transverse thickening assessed by 2D transverse strain is correlated to exercise
capacity of these patients. In the follow up of AS-TGA patients the monitoring of RV transverse myocardial
deformation properties should be considered more than the simple evaluation of RV longitudinal function
Short-term electrogeometric atrial remodelling after percutaneous atrial septal defect closure
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
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
- …
