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Intestinal interposition : the prevalence and clinical relevance of non-hepatodiaphragmatic conditions (nonChilaiditi forms) documented by CT and review of the literature [Interposizione intestinale : prevalenza e impatto clinico delle condizioni non epatodiaframmatiche (non-Chilaiditi) documentate con TC e revisione della letteratura]
No full textRiassunto
Obiettivo. Scopo del nostro lavoro è stato valutare la
prevalenza e l’impatto clinico delle forme di interposizione
intestinale non epatodiaframmatiche in una popolazione
adulta studiata con tomografi a computerizzata (TC) per
differenti indicazioni medico-chirurgiche.
Materiali e metodi. Da novembre 2008 ad aprile 2009,
due autori hanno valutato insieme i casi di interposizione
intestinale su 4338 pazienti adulti sottoposti a indagini TC.
In tale studio, sono state evidenziate sia interposizioni di
tipo epatodiaframmatico, che sono state defi nite Chilaiditi
come da letteratura, sia altri tipi di interposizione defi nite
secondo i diversi rapporti anatomici: splenorenale,
retrogastrica, epatocavale, retrosplenica e retrorenale, che
sono state raggruppate sotto il termine non-Chilaiditi. È
stato successivamente sottoposto ai pazienti dei due gruppi
e ad un gruppo controllo un questionario relativo ai
disturbi clinici associati più frequentemente alla sindrome
di Chilaiditi. Sono stati quindi comparati i dati clinici
relativi ai tre gruppi.
Risultati. Su 4338 pazienti sono stati osservati 130 (3%)
pazienti con interposizione colica per un totale di 143
manifestazioni, 90 Chilaiditi e 53 non-Chilaiditi: 30
interposizioni di tipo splenorenale, 12 di tipo retrogastrico,
5 epatocavale, 4 retrosplenico e 2 retrorenale. L’analisi
statistica ha evidenziato che le forme di Chilaiditi
producono una maggiore sintomatologia (24,4%), seguite
dalle forme non-Chilaiditi (18,9%) e infi ne dai casi controllo (10,8%). Tale analisi è stata validata dal test di
signifi catività χ2.
Conclusioni. Le forme non-Chilaiditi hanno rappresentato
più della metà delle forme Chilaiditi, con la manifestazione
splenorenale di gran lunga la più frequente. Abbiamo
inoltre evidenziato che anche le forme non-Chilaiditi sono
statisticamente più sintomatiche dei casi controllo.PURPOSE:
This study was done to assess the prevalence and clinical impact of non-hepatodiaphragmatic interpositions in a sample of adult patients undergoing computed tomography (CT) for a variety of medical reasons.
MATERIALS AND METHODS:
From November 2008 to April 2009, two observers jointly examined the cases of intestinal interposition in 4,338 adults undergoing CT investigations. This study sought to identify not only hepatodiaphragmatic intestinal interpositions, defined as Chilaiditi, but also other forms of intestinal interposition, which we termed non-Chilaiditi. The latter were divided into five different classes on the basis of their anatomical relationships: splenorenal, retrogastric, hepatocaval, retrosplenic, and retrorenal. Moreover, a questionnaire investigating the clinical symptoms reported to be associated with Chilaiditi syndrome was given to patients exhibiting any form of intestinal interposition and to a control sample. Finally, clinical data related to the three groups were compared.
RESULTS:
Of the 4,338 patients examined, 130 (3%) were found to have intestinal interposition, for a total of 143 forms: 90 Chilaiditi and 53 non-Chilaiditi. Of the latter, 30 were splenorenal, 12 retrogastric, five hepatocaval, four retrosplenic and two retrorenal. Statistical analysis showed that the Chilaiditi group suffered most symptoms (24.4%), followed by the non-Chilaiditi group (18.9%) and control cases (10.8%). Our results were validated using the χ(2) test of significance.
CONCLUSIONS:
The number of non-Chilaiditi cases amounted to just over half the number of Chilaiditi cases, with the splenorenal form being by far the most frequent. Statistical analysis showed that patients with non-Chilaiditi forms of intestinal interposition had more symptoms than did controls
Aortic intramural hematoma : can unenhanced phase be eliminated from dual-phase chest pain CT angiography protocol- implications on diagnostic accuracy
No full textPURPOSE.
To evaluate whether the elimination of unenhanced imaging acquisition series from dual-phase chest pain CT angiography protocol may affect diagnostic accuracy in the detection of Intramural Hematoma (IMH), and justify the reduced radiation dose.
METHOD AND MATERIALS.
From October 2006 to February 2011, 37 patients (20 males, 17 females ; mean age 65.0 years) with acute chest pain underwent emergency multi-detector CT angiography (MDCTA) and subsequent Transesophageal Echocardiography (TEE) and/or surgery for IMH. All patients underwent MDCTA with a 64-slice scanner (Somaton Definition, Siemens, Germany).Two experienced Emergency Radiologists blind-tested with regard to the diagnosis, assessed the images in two different sessions in which enhanced (single-phase MDCTA) , and combined unenhanced and enhanced (dual-phase MDCTA) findings were separately evaluated.Sensitivity, specificity and accuracy of both modalities, along with 95%CIs, were calculated by using TEE and surgical confirmation as reference standards.
RESULTS.
Single-phase MDCTA showed a higher number of false negative, and false positive results than did dual-phase MDCTA. For the detection of aortic IMH, the sensitivity, specificity and accuracy, respectively, were 85%, 93% and 92% for combined dual-phase MDCTA , and 51%, 77%,and 69% for single-phase MDCTA.
CONCLUSION.
The acquisition of unenhanced images during dual-phase chest pain MDCTA protocol provides additional benefit in terms of diagnostic accuracy over single-phase CT , and warrants the increased radiation dose.
CLINICAL RELEVANCE/APPLICATION
Our results suggest that unenhanced phase should not be eliminated from dual-phase chest pain MDCTA protocol
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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