1,720,957 research outputs found
Malposition of a central venous catheter in a patient with severe chest trauma
No full textThe placement of a central venous catheter is associated with specific risks including malposition of the catheter. We report the case of a 32 year old man who suffered from a severe thoracic trauma including haematopneurnothorax on his left side. In the emergency room a large-bore central venous catheter was placed in the left subclavian vein, after blood had been aspirated successfully. Later, the haemodynamic state of the patient deteriorated, so that cardiopulmonary resuscitation had to be started. While great amounts of blood transfusions were applied via the catheter using a rapid transfusion device, the blood loss over the left sided chest tube increased rapidly. Emergency thoracotomy was performed, revealing that the catheter was not in intravenous position, but in intrapleural malposition. Haematothorax was caused by a laceration of the upper lobe of the left lung with severe bleeding from great vessels. This case shows that successful aspiration of blood does not exclude malposition of a central venous catheter. Correct position of the catheter must be verified using appropriate methods including chest X-ray, intracardiac ECG, tracing or display of the central venous pressure curve on a monitor
Aberrant location of a central venous catheter in a patient with severe thoracic trauma - Reply
No full textOpioid intoxication following transdermal application of fentanyl
No full textThe case of a 77-year-old woman is described,who was found unconscious, with decreased respiration and miotic pupils, having previously experienced dizziness, nausea and drowsiness before. In the emergency room a fentanyl patch was detected, which had obviously been mistakenly applied by the patient the day before. Opioid intoxication was assumed and successfully treated with naloxon. The patient was supervised in an ICU for 24 h and sent home the next day without serious sequelae. The consequences following inappropriate use of transdermal fentanyl are discussed
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
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