1,720,998 research outputs found
Nonfatal cerebral air embolism after dental surgery.
Full text linkAfter removal of four impacted third molars under general anesthesia, our patient developed subcutaneous emphysema, pneumothorax, pneumopericardium, and pneumomediastinum. Soon thereafter, coma with generalized epileptic status ensued. A cerebral magnetic resonance and single photon emission computed tomography showed hypoperfusion of the right thalamus and parietal, temporal, and frontal cortices. The likely mechanism was injection of air by the high-speed dental drill through the soft tissue adjacent to the roots of the lower molars. We were unable to find any previous report of systemic air embolism after oral surgery
Intracranial pressure monitoring during percutaneous tracheostomy "Percutwist" in critically ill neurosyrgery patients
Full text linkBACKGROUND: Tracheostomy is commonly required as part of the management of patients with severe brain damage. Percutaneous dilation tracheostomy is increasingly used in intensive care unit as an alternative to standard surgical tracheostomy. However, this procedure carries the risk of neurological complications, particularly in patients with intracranial hypertension. In this study, we sought to quantify the effects of Percutwist(R) tracheostomy (Rusch-Teleflex Medical) on intracranial pressure (ICP), cerebral perfusion pressure (CPP), arterial CO(2) tension (Paco(2)), and arterial O(2) tension (Pao(2)), in 65 consecutive critically ill patients admitted to the neurosurgical intensive care unit, undergoing bedside percutaneous tracheostomy. METHODS: Sixty-five patients (29 men, 36 women, mean age 43 yr, 7 +/- 10.6) Glasgow Coma Scale or=8, requiring long-term ventilatory support with a stable ICP or=20 mm Hg were included. Elective percutaneous tracheostomies were performed at the bedside under endoscopic fiberoptic control. Intraoperative monitoring included continuous: electrocardiogram, Spo(2), invasive arterial blood pressure, ICP, CPP = mean arterial blood pressure-ICP). Episodes of ICP increment above 20 mm Hg or CPP decrease below 60 mm Hg (lasting more than 3 min) were recorded; hypoxia was defined as Pao(2) below 90 mm Hg, hypercarbia as Paco(2) more than 40 mm Hg. RESULTS: Eighteen episodes of intracranial hypertension were recorded in 11 patients. No statistically significant modification of monitored variables was recorded, although the transient ICP increase was very close to statistical significance (P = 0.051). No episodes of CPP reduction below 60 mm Hg occurred. Six percent of patients developed hypercarbia. CONCLUSIONS: Percutwist tracheostomy is a single-step method which allows for effective ventilation during the procedure, thus reducing the risk of hypercarbia and development of intracranial hypertension. The technique did not cause secondary pathophysiological insult and could be considered safe in a selected population of brain-injured patients
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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