1,720,959 research outputs found
Evaluation of patient-centered and clinical outcomes after minimally invasive cardiac surgery: an observational cohort study
No full textEvaluation of patient-centered and clinical outcomes after minimally invasive cardiac surgery: an observational cohort study
No full textAortic Valve Replacement: Totally Endoscopic versus Mini-Sternotomy
No full text(1) Background: The development of totally endoscopic aortic valve replacement has the potential to enhance clinical results compared to mini-sternotomy. To our knowledge, no comparison between these two techniques has been conducted before. Therefore, the objective of this retrospective study is to examine the results after both totally endoscopic and mini-sternotomy approaches. (2) Methods: This study covered all elective patients who underwent isolated aortic valve replacement, either totally endoscopically (n = 392) or through a mini-sternotomy (n = 323), between 2013 and 2021. Multivariable analysis was used to account for baseline variations between the two groups. All data were retrospectively gathered and analysed. The primary objective of this study was the one-year mortality rate. (3) Results: The mean aortic cross-clamping and cardiopulmonary bypass times were significantly longer in the totally endoscopic approach (cross-clamping: 43.73 +/- 13.71 min and 61.93 +/- 16.76 min, p-value < 0.001; CPB time: 64.86 +/- 23.02 min and 93.23 +/- 23.67 min, p-value < 0.001). However, perioperative bleeding was lower (706.40 +/- 542.77 mL and 444.50 +/- 515.84 mL, p-value < 0.001). The primary objective, one-year survival, did not significantly differ between both groups (Mini-AVR: 94.5% vs TEAVR: 93.3%, p-value = 0.520). (4) Conclusions: Our results show that totally endoscopic aortic valve replacement has comparable clinical results compared to aortic valve replacement through mini-sternotomy.This research received no external fundin
Totally endoscopic coronary artery bypass grafting: experience in 1500 patients
No full textOBJECTIVES Totally endoscopic coronary artery bypass grafting (TECAB) is a minimally invasive approach to achieve surgical revascularization through a minimally invasive approach. Still, data regarding non-robotic TECAB are limited. This report presents the results of a TECAB technique using long-shafted instruments, defined as Endo-CABG, from a single-centre experience in 1500 consecutive patients. METHODS One thousand and five hundred patients underwent Endo-CABG between January 2016 and February 2023. Data were collected retrospectively, and patients were followed up for 1 year. The primary outcome of this study was major adverse cardiac and cerebrovascular events (MACCE)-free survival. Secondary efficacy outcomes were graft failure and mortality. Furthermore, we analysed factors influencing long-term freedom from MACCE and all-cause mortality. RESULTS The mean age was 68 [61-75] years, of which 193 (12.87%) were octogenarians. Multivessel disease was present in 1409 (93.93%) patients, and the mean EuroSCORE II was 1.64 [1.09-2.92] %. All patients underwent full arterial revascularization with bilateral internal mammary grafting in 88.47%. Graft failure occurred in 1.80% of cases after 1 year (n = 27). Thirty-day mortality was 1.73% (n = 26), 1-year survival was 94.7% (95% CI: 93.5-95.9%; n = 26) and 1-year MACCE-free survival was 91.7% (95% CI: 90.2-93.2%). Age, left ventricular ejection fraction, arterial hypertension and urgency were significantly associated with 1-year MACCE-free survival. CONCLUSIONS Endo-CABG appears to be a safe procedure, achieves surgical revascularization and provides good outcomes regarding graft failure and MACCE at 1 year, while age, left ventricular ejection fraction, arterial hypertension and urgency were associated with 1-year outcomes
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
- …
