1,720,981 research outputs found
Three-dimensional versus two-dimensional video system for the trained endoscopic surgeon and the beginner.
No full textExperimental study of a new open stent for vessel banding in a swine model: long-term results
No full textAims. A new stent was designed, conceived for being placed externally around blood vessels to perform vessel banding in a much simple and fast way. In fact it requires the dissection of a single segment of the aortic wall, as its mechanical features allow it to slide on the tunica adventitia. After previous tests (ex vivo and in vivo test), the new stent has been evaluated in vivo long-term study. Methods. In female pig of average weight of 60 kg, after placement of endoprosthesis in infrarenal abdominal aorta, immediately below renal arteries, aortic banding was performed with new stent at the level of each end of endoprosthesis, identified under fluoroscopic guidance. Pigs were followed up for six months, and acetylsalicylic acid was administrated: 100 mg once a day. After six months, histological evaluation of explanted abdominal aorta was performed. Results. New stent made the aortic banding simple and fast. Postoperative course was uneventful. Histological results were similar to previous 10-week survival tests and not damages of aortic wall were observed. Conclusion. Positive outcome of three last long-term survival tests, as of all those ex vitro and in vivo tests previously performed, makes conceivable further scientific investigation and trials
Three-dimensional versus two-dimensional video system for the trained endoscopic surgeon and the beginner
No full text
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
[Familial neoplasms: investigation of genealogic trees of patients surgically treated for colonic adenocarcinoma]
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
Angiosome-targeted revascularisation in diabetic foot ulcers.
No full textPeripheral vascular disease is a common complication of type 2 diabetes and is often more severe and diffuse than in non-diabetic individuals with a higher risk of major amputations in the lower limbs. Diabetic foot revascularisation using both traditional bypass surgery and endovascular therapy are often burdened by the failure and the inevitable subsequent massive amputation. In this study, we examined the clinical response of diabetic patients with critical limb ischaemia and extended ischaemic wounds, treated with a new angiosome-based revascularisation technique. In a 3-year period, nine diabetic patients with imminent amputation threatening and foot ulcers with no feasible arterial revascularisation options were treated by the angiosome- based surgical technique by means of deep vein arterialisation. The postoperative tcPO2 evaluation showed a mean increase in the cutaneous oxygen tension in all patients treated. The overall survival rates were 88·88%, 88·88% and 77·77% at 12, 24 and 36 months, respectively. Limb salvage was 100% at 1year and steady at 88·88% thereafter. Surgical deep venous arterialisation might be considered as an extreme alternative to attempt tissue preservation in limbs unfit for conventional arterial revascularisations. This technique would give advantages to the patients in terms of better compliance to the minor amputations and thus avoiding major limb amputation
EVOLUZIONE DEL MONCONE AORTICO E DELL’ANASTOMOSI AORTO-PROTESICA NEI PAZIENTI OPERATI PER ANEURISMA
No full textAppropriate 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
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