1,720,974 research outputs found
Unexpected Complication of a Nitinol-Constrained Balloon Angioplasty (Chocolate) in Rutherford Class 3 Patient Presenting Challenging Aorto-Iliac Anatomy
No full textWe report an unusual complication of Chocolate nitinol-constraining structure after right superficial femoral artery (SFA) angioplasty. The procedure was performed by vascular surgeons in an operating theater equipped by a portable fluoroscopy unit. Under local anesthesia, by a contralateral approach, a 7F introducer sheath was advanced through the proximal portion of the right common iliac artery. Owing to the severe aorto-iliac vessels calcification, it was not possible to place the introducer sheath into a more distal vessel, as planned. After external iliac artery (EIA) stenting (7 × 80 mm Eluvia), SFA obstruction was intraluminal crossed, and a 6 × 120 mm nitinol-constrained balloon (Chocolate; Medtronic) was advanced in place and inflated. Once the balloon came out, the nitinol-constraining structure was not attached to the balloon surface. Under fluoroscopy, the crashed nitinol mesh was identified at distal edge of previously positioned EIA stent. To prevent mesh migration, it was fixed by covering with a 7 × 40 mm stent. The procedure was then successfully completed, as planned. One-month, postoperative computed tomography angiography showed complete expansion of the stents and no significant residual stenosis (>30%) in EIA, and SFA. Chocolate's mesh was still evident between the stent and the iliac artery wall, in absence of further complications. A 3 months follow-up, patient was still completely asymptomatic for claudication
Ovation Alto stent-graft implantation in patient with TASC D aorto-iliac lesion and coexistent AAA - Case report
No full textSteno-obstructive lesion of the iliac axes and coexisting abdominal aortic aneurysm (AAA) are classified as TASC D aorto-iliac lesions. Although open surgical repair remains the gold standard, updates on stent-grafts labeling and technical improvements have resulted in a gradual replacement of open surgical bypass with endovascular treatments, especially in high-risk patients. We report a case of an infrarenal AAA with hostile proximal aortic neck associated with a chronic total occlusion of the left external iliac artery (EIA). Ovation Alto stent-graft implantation (Endologix, Santa Rosa, CA, USA) was performed through the iliac endoconduit, after EIA's retrograde subintimal recanalization with the re-entry IVUS-guided cathete
Iliac-femoro-popliteal district: decision making and current statement—aneurysms and nonatherosclerotic pathology
No full textIn vascular surgery, aneurysmal diseases of the iliac-femoro-popliteal district represent an important topic of study and the evaluation of all those pathological situations that do not recognize atherosclerosis as a primary etiopathogenetic element. In the following chapter, in accordance with the manual, the most important clinical scenarios for which every physician should know how to deal will be describe
Early experience with a new concept of angioplasty Nitinol-constrained balloon catheter (Chocolate®) in severely claudicant patients
No full textBACKGROUND: To report our experience in treating severely claudicant patients, employing a "nitinol-constrained" balloon (Chocolate, TriReme Medical Inc., Pleasanton, CA-USA) before drug-coated balloon (DCB) in a standardized protocol. METHODS: Eighty-one (84 limbs) consecutive Rutherford category (RC) 3 patients treated between December 2014 and December 2016 for superficial femoral artery (SFA) and popliteal arterial (PA) disease by nitinol-constrained balloon followed by DCB were enrolled. Bailout stenting was performed by Zilver PTX implantation. Intraoperative technical success and bailout-stenting rates were assessed as well as clinical improvement, ankle-brachial index (ABI) modification, primary patency (PP), and secondary patency (SP) rates at follow-up. RESULTS: Sixty-eight patients (83.9%) were male and 31 (38.2%) diabetics. Fifty-five limbs (65.5%) presented occlusion (CTO); in 18 limbs CTO was longer than 150 mm. Bailout stenting rate was 9.5% (8/84). All patients completed 30-day follow-up: PP 100%, 61 patients completely asymptomatic (RC = 0). Mean follow-up was 12.3 ± 5.6 months; overall PP was 98.8%, and SP was 98.8%. At mid-term analysis, no differences in outcomes were recorded between stenosis and CTOs with a PP of 96.5 and 96%, respectively (p = 0.725). CTO length impacted early results: in cases of CTOs < 150 mm, PP was 100%, while in CTOs > 150 mm, it was 83.3% (p = 0031). ABI at 12-month was significantly higher with respect to preoperative values (p < 0.001). CONCLUSIONS: In this preliminary experience, our protocol seems to be safe and effective in treating SFA and PA lesions in claudicant patients with satisfactory early and 12-month results
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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