1,720,958 research outputs found
Impact of patient-information and contrast medium to heart rate in CT of coronary arteries. A prospective study from the radiographers perspective
No full textZielsetzung: Hohe Herzfrequenzen (HF) während der CT-Angiographie (CTA) der Koronarien nehmen Einfluss auf Bildqualität und Patientendosis. Gründe für hohe HF können Ängste der Patienten und der Kontrastmittel-Bolus sein. Ob RadiologietechnologInnen einen Beitrag zur Erreichung der Zielfrequenz (HF≤65 bpm) leisten können, soll evaluiert werden.
Methode: Bei 122 konsekutiven, prospektiv randomisierten Patienten wurde die Höhe der HF nach (1) Patienteninformation (persönliches Gespräch versus standardisiertes Informationsblatt) – im Calzium-Scoring (CALZ), sowie während Applikation von (2) Kontrastmittel (Iomeprol 400mgJ/ml versus Iodixanol 320mgJ/ml) – in der CTA gemessen. Als Ziel wurde eine HF≤65bpm definiert.
Ergebnisse: 69% (n=84) erreichten die Zielherzfrequenz (≤65bpm) im CALZ. Von diesen 84 Patienten HF≤65 CALZ erreichten 66 (78%) auch während CTA die Zielherzfrequenz. Eine HF≤65bpm im CALZ stellte somit einen positiven Prädiktor für das Erreichen der HF≤65 während CTA dar. 22 (18%) Patienten mit HF>65bpm im CALZ erhielten eine i.v. Betablocker-Medikation. Davon erhielten 32% (n=7) zu 68% (n=15) eine Prämedikation in Abhängigkeit von der vorangegangenen Information (p0,05) bestand zwischen Iomeprol und Iodixanol in der CTA beim Vergleich der HF-Mittelwerte (n=122). Allerdings zeigte sich ein signifikanter HF-Anstieg mit Iomeprol (p=0,0001) in Bezug auf die individuelle HF zwischen CALZ und HF-CTA. Iodixanol zeigte diesbezüglich keine Signifikanz (p>0,05).
Zusammenfassung: HF≤65bpm während CALZ war ein Prädiktor für HF≤65bpm während CTA. Die persönliche Patienteninformation zeigte an Patienten unter Stress eine positive Wirkung auf die HF im CALZ. Bei der Anwendung von Iomeprol stieg die HF mit Iodixanol konnte kein signifikanter HF-Anstieg während der CTA nachgewiesen werden. Weitere Studien an größeren Kollektiven zur Klärung des klinischen Benefit sind angezeigt.Objective: High heart rates (HR) are related to image quality and patient dose in computed tomography of the coronary arteries (CTA). Patient anxiety and contrast bolus may explain high HR. The question is whether radiographers make a contribution to receive the goal heart rate (HR≤65 bpm).
Methods: In 122 consecutive prospective randomized patients HR after (1) patient information (one-to-one talk versus information-handout) – in calcium scoring (CALC), and (2) during contrast application (Iomeprol 400mgI/ml versus Iodixanol 320mgI/mg) – in CTA were measured. Goal heart rate - HR≤65bpm was defined.
Results: 69% (n=84) patients received the goal HR≤65bpm in CALC. Among these 84 patients with CALZ-HR≤65bpm 66 (78%) also received the goal heart rate in CTA. Therefore HR≤65bpm in CALZ was a positive predictor for HR≤65bpm in CTA. 22 (18%) patients with HR>65bpm in CALC required i.v. betablocker medication. Among these 32% (n=7) in relation to 68% (n=15) received a premedication depending on the information before (p0,05) to HR-mean value was to notice with Iomeprol and Iodixanol in CTA (n=122). But a significant result with Iomeprol to HR increase (p=0,0001) in relation to individual HR in CALZ and HR in CTA was to notice. However there was no significance with Iodixanol (p>0,05).
Conclusion: HR≤65bpm in CALZ was a significant predictor for HR≤65bmp in CTA. One-to-one talk with the patient before investigation showed a positive effect to HR-CALZ in patients with stress. With Iomprol HR increased in CTA but no significant HR increase was to notice with iodixanol. Evaluations in higher population might show clinical benefit.Wien, FH Campus Wien, Masterarb., 201
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
European Radiology / Letter to the Editor: “How to set up a 24/7 cardiac computed tomography service in an emergency department”
No full textDispelling 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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