1,720,966 research outputs found
Deltoido pectoralis approach to axillary vessels for full flow cardiopulmonary bypass.
No full textAbstract: Axillary artery has been proposed as a safe and effective alternative for arterial cannulation in surgical procedures involving ascending aorta and/or aortic arch, and is nowadays the site of choice in many centres. Advantages of axillary artery cannulation include antegrade flow and the possibility of selective mono-hemispherical brain perfusion during circulatory arrest. Experiences with the axillary vein cannulation, however, are scarce. Here we report our preliminary experience with axillo-axillary cardiopulmonary bypass, through both axillary artery and vein cannulation (using echo-guided Seldinger technique) at deltoido-pectoralis groove. We have used such an approach in 5 cases of redo surgery on ascending aorta and we have not had any inconvenience during cardiopulmonary bypass. Full flow was maintained in all patients (in 2 with vacuum assisted drainage) including 2 cases with deep hypothermic circulatory arrest. In conclusion such an approach seems to be feasible and effective and can be safety performed providing that accurate TE echo monitoring is provided. (C) 2009 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All rights reserved
Intra aortic balloon pump insertion through left axillary artery in patients with sevre peripheral arterial disease
No full textAbstract
Intra aortic balloon pump (IABP) is the mechanical assist device most frequently used in cardiac surgery. Recent demonstration of better outcome following preoperative IABP insertion in high-risk patients has further extended its indication. However, due to an increasing complexity of patients currently referred for cardiac surgery, several patients with potential indication for preoperative and/or postoperative IABP present severe peripheral vascular disease which usually contraindicates IABP insertion. Here we present an alternative technique for IABP insertion in patients with severe peripheral vessel disease
Late angiographic changes of the left anterior descending coronary artery following removal of multiple occluded stents and on-lay patching with the left internal mammary artery
No full textAbstract
We present postoperative and midterm (3 years) angiographic changes after removal of five (of six) occluded stents from the left anterior descending (LAD) coronary artery and its reconstruction with a 9-cm-long on-lay patching done with the left internal mammary arter
Old prosthesis with a modern concept: 41-year survival with a stureless Magovern-Cromie aortic valve prosthesis
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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
Minimally invasive approach for complex cardiac surgery procedures
No full textAbstract
BACKGROUND: A minimally invasive approach through an upper ministernotomy (UMS) has been used in our Division since 1997. On the basis of favorable outcome we have gradually extended this approach from isolated aortic valve replacement (AVR) to more complex cardiac surgery procedures and it is currently our first choice for a variety of procedures. Here we report our 11 years experience.
METHODS: From 1997 to December 2007, 1,126 procedures were performed at our department, using UMS. Isolated procedures on the aortic valve were performed in 695 patients (61%). Isolated procedures on the aortic valve as redo operation were performed in 77 patients (7%). Complex cardiac surgery procedures (including double valve replacement-repair, ascending aorta-aortic arch replacement, aortic root replacement, aortic dissection, AVR combined with coronary surgery, and complex redo procedures) were performed in 354 patients (32%). Early postoperative outcome was evaluated considering three different groups according to the surgical procedure (first time AVR, redo AVR, and complex procedure).
RESULTS: Overall conversion to full sternotomy was required in 16 patients (1.4%) with no significant differences between isolated AVR (9 patients, 1.3%) and complex or redo procedures (1 patient [1.2%] and 6 patients [1.6%], respectively). Forty-seven patients died in hospital (cumulative in-hospital mortality of 4.1 %). Mortality according to the procedure was 6.7, 3.8, and 2.8% for complex, redo AVR, or isolated AVR procedures, respectively, with a significant difference only for the complex procedures. Similarly, early postoperative outcome in terms of incidence of prolonged mechanical ventilation and ICU stay was significantly different only in the complex procedure group. Incidence of surgical revision (5.1, 2.9, and 2.7% for complex, redo, or isolated AVR procedures, respectively) showed no statistically significant differences regardless the type of procedures.
CONCLUSIONS: Our experience clearly shows that a minimally invasive approach through upper ministernotomy is feasible and safe not only for isolated AVR but that it can also be utilized for a variety of complex surgical procedures. Minimizing surgical access may be helpful in patients undergoing complex surgical procedures, especially redo procedures, without compromising the surgical result
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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