1,721,118 research outputs found
Transcatheter mitral valve interventions (TRAMI) registry. The German mitral valve registry
No full textThe transcatheter mitral valve interventions (TRAMI) registry was established in 2010 in order to assess the safety and efficacy of percutaneous mitral valve therapy in Germany and to document baseline characteristics and decision-making in different subgroups of patients. The TRAMI registry is available to all German sites performing percutaneous mitral valve therapy. Follow-up is scheduled at 30 days, 1, 3, and 5 years. In addition, patients can be enrolled retrospectively without predefined times of follow-up. The vast majority of patients enrolled in TRAMI underwent MitraClipA (R) therapy. As of march 2013, a total of 1,064 patients treated with MitraClipA (R) have been enrolled at 21 different German sites. Preliminary results show that patients treated with MitraClipA (R) in Germany were mainly elderly patients with significant comorbidities and high or inacceptable risk of surgery. The majority of patients had secondary mitral regurgitation and a large proportion of patients had reduced left ventricular ejection fraction (LV-EF). Nevertheless, MitraClipA (R) was found to be safe and established risk factors for conventional cardiac mitral valve surgery, such as advanced age (a parts per thousand yen76 years), female gender, severely reduced LV-EF (< 30%) and high logistic EuroScore (a parts per thousand yen20%) were not predictive for mortality or major complication rates. In contrast, severely reduced renal function was predictive for adverse outcome. The TRAMI registry is the largest real world cohort of patients treated with MitraClipA (R). As long as randomized studies in this high-risk cohort of patients are lacking, TRAMI provides important information on outcomes after MitraClipA (R) therapy. The data are important for hypothesis generation for randomized trials and TRAMI is an important tool for quality assurance after percutaneous mitral valve therapy in Germany
A Study from the German Cardiosurgical Atrial Fibrillation Registry
No full textAbstract Epicardial surgical ablation is an effective strategy to treat non-paroxysmal forms of atrial fibrillation. Current thoracoscopic epicardial surgical strategies are complex, and are therefore often avoided. With slight modifications to the thoracoscopic maze procedure, totally thoracoscopic all-box clamping may facilitate the performance of epicardial thoracoscopic ablation, while maintaining good results. Between December 2023 and December 2024, 42 patients underwent thoracoscopic all-box clamping at a single center. All-box clamping uses commercially available bipolar radiofrequency clamps for isolation of the ipsilateral pulmonary veins and posterior left atrial wall through right and then left-sided thoracoscopic access. The left atrial appendage is occluded using a clip device, and the ligament of Marshall is transected. Assessment of a bidirectional block confirmed electrical isolation. Data from the CASE-AF registry were analyzed retrospectively. Short-term results pertaining to efficacy and safety are provided. All-box clamping was successfully offered to all patients by three surgeons. There were no reported major or minor complications. The median hospital stay was 6 days (interquartile range 5–6). At discharge, a sinus rhythm was observed in 92.9%, and in 76.1% of patients off any class I/III antiarrhythmic drugs. Surgical ablation with a modified thoracoscopic technique is safe and feasible for the treatment of atrial fibrillation
The influence of age on outcomes after MitraClip therapy in the German mitral valve registry (TRAMI registry)
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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
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
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
Characteristics and outcome of patients with or without history of coronary artery disease presenting with an acute coronary syndrome in a chest pain unit: results of the german CPU registry
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