1,721,048 research outputs found
Current status of transcatheter mitral valve therapy in Europe: Results from an EAPCI survey (Part II)
Full text linkAims: The European Association of Percutaneous Coronary Interventions (EAPCI) assessed the current status of transcatheter valve therapy in Europe through a web-based survey. Our aim here was to report the results of that survey regarding trends in percutaneous mitral valve repair (PMVR) therapy. Methods and results: Among 301 European centres participating in the overall EAPCI survey, 246 (81.7%) responded to the PMVR section questions. A total of 176 (71.5%) have been undertaking a PMVR programme. Among responding centres (n=129), 58.1%, 15.5% and 26.4% performed ≤10, >10-40 and >40 PMVR procedures, respectively, in 2014. The majority of centres performing >40 PMVR procedures in 2014 were in Germany (82.4%). MitraClip was the most commonly performed technique (used in 91.8% of centres) followed by the valve-in-ring or valve-in-valve for failed surgical prostheses using transcatheter aortic valve devices (41.5%). Of those centres not performing PMVR (n=70), 41.4% were not considering initiating a programme, mostly for economic reasons (69.0%), or because of limited data available (20.7%) or no interest (10.3%). Conclusions: The second part of this EAPCI survey documents the limited PMVR penetration in Europe, despite an increasing interest. Possible reasons for this include economic, regulatory and logistic issues, challenging techniques, along with a lack of compelling studies and clear indications
Current status of transcatheter valve therapy in Europe: results from an EAPCI survey
No full textOur aim was to identify current discrepancies among European countries, and provide a basis for a general agreement on decision making specifically related to TAVI procedures. The European Association of Percutaneous Coronary Interventions (EAPCI) therefore assessed the current status of transcatheter valve therapy (TAVI) in Europe through a web-based survey
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
Transcatheter Aortic Valve Implantation Versus Surgical Aortic Valve Replacement: A Systematic Review and Meta-analysis
No full textBACKGROUND:
The comparative benefits and harms of transcatheter aortic valve implantation (TAVI) and surgical aortic valve replacement (SAVR) for patients with aortic stenosis are unclear.
PURPOSE:
To compare clinical outcomes, including early (≤30-day) and midterm (≤1-year) mortality, in adults with severe aortic stenosis undergoing either TAVI or SAVR.
DATA SOURCES:
MEDLINE, Cochrane, and Scopus databases (without language restrictions) from April 2002 to 5 April 2016; multiple registries and Web sites; scientific meeting presentations.
STUDY SELECTION:
Five randomized trials and 31 observational matched studies comparing mortality outcomes after TAVI or SAVR.
DATA EXTRACTION:
Two investigators independently extracted study data and rated risk of bias.
DATA SYNTHESIS:
16 638 patients were analyzed. Overall, there was no statistically significant difference between TAVI and SAVR in early (odds ratio [OR], 1.01 [95% CI, 0.81 to 1.26]) or midterm (OR, 0.96 [CI, 0.81 to 1.14]) all-cause mortality. Analyses restricted to trials (early: OR, 0.80 [CI, 0.51 to 1.25]; midterm: OR, 0.90 [CI, 0.64 to 1.26]) were inconclusive, with wide CIs, whereas analyses of matched studies were similar to the overall results. Transfemoral TAVI provided mortality benefits over SAVR in trials. Analyses restricted to studies of patients at low to intermediate risk showed statistically nonsignificant reductions in early (OR, 0.67 [CI, 0.42 to 1.07]) and midterm (OR, 0.91 [CI, 0.67 to 1.23]) mortality with TAVI. Incidence of periprocedural myocardial infarction, major bleeding, acute kidney injury, and new-onset atrial fibrillation was lower with TAVI, but risk for pacemaker implantation, vascular complications, and paravalvular leak increased. Overall, there was a statistically nonsignificant increased risk in long-term (2- to 5-year) all-cause mortality with TAVI (OR, 1.28 [CI, 0.97 to 1.69]), whereas long-term mortality outcomes in patients at low to intermediate risk were inconclusive, with wide CIs (OR, 1.06 [CI, 0.59 to 1.91]).
LIMITATION:
The number of trials was limited, and study designs and patient characteristics were heterogeneous.
CONCLUSION:
Compared with SAVR, TAVI may have similar or better early and midterm outcomes for adults with aortic stenosis, including those at low to intermediate risk
New-onset atrial fibrillation and increased mortality after transcatheter aortic valve implantation: A causal or spurious association?
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
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