1,721,012 research outputs found
Labat lecture: the role of neurolytic celiac plexus block in pancreatic cancer pain management: do we have the answers?
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
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
Bail-out transcatheter aortic valve implantation to reduce severe acute aortic regurgitation in a failing homograft secondary to HeartMate II ventricular assistance device
No full textLeft ventricular assistance with surgically implanted pump devices like the HeartMate may be crucial in selected patient with end-stage heart failure. However, mainly due to its high aortic output, the pump itself may induce severe aortic regurgitation that could result in paradoxycal worsening of the anterograde perfusion after the initiation of the support. Surgical or percutaneous occlusion of the aortic valve has proved useful in these kinds of patients. Here we present a successful case of bail-out CoreValve implantation after HeartMate II positioning complicated by acute severe aortic regurgitation in a patient with a failing homograft and end-stage ventricular dysfunction, ineligible for heart transplanatio
Both right and left cervical cordotomies depress sympathetic indexes derived from heart rate variability in humans RID G-6275-2011
No full textThe TURP Sindrome: importance of expiratory ethanol measurement and high serum levels of glycine.
No full textOBJECTIVE: In a prospective study it was our intention to evaluate the
reliability and the predictive value of expiratory ethanol for the early
detection of the occurrence of TURP syndrome and emphasize the role of the serum
levels of glycine in clinical manifestation.
METHODS: We studied 30 patients scheduled for elective traditional transuretral
resection of the prostate performed with subarachnoid anesthesia. Serum sodium
and glycine concentrations, serum osmolality and end-expiratory ethanol levels
were monitored at scheduled intervals. Continuous heart rate and blood pressure
monitoring was performed during the perioperative period in the operativing room
and, later, in the recovery room. Occurrence of cardiocirculatory, respiratory
and neurologic symptoms were recorded. Statistics included Bonferroni's t-test
and Fisher's exact test. A decision level plot for end-expiratory ethanol level
was performed for the choice of predictivity criterion.
RESULTS: In our population we identified three groups of patients: Group I (15
patients) in which no symptom was recorded; Group II (6 patients) in which
non-specific anesthesia-related symptoms occurred; Group III (9 patients) in
which TURP syndrome of various degree of severity was observed. In this group of
patients changes in serum sodium and glycine concentrations, serum osmolality and
end-expiratory ethanol levels were significantly different compared with the
other two groups. In regard to end-expiratory ethanol levels, we identified a
cut-off point at 0.05 mg/ml. In Group III two patients developed transient
blindness. These patients had the highest serum glycine concentrations (> 4000
mumol/ml). Mortality was nil.
CONCLUSIONS: Our data show the reliability and accuracy of end-expiratory ethanol
levels as a predictive test of the occurrence of TURP syndrome. Further, we
emphasize the role of serum glycine concentration in the occurrence of neurologic
symptoms related to the transurethral resection of the prostate
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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