1,720,965 research outputs found
Combined endoscopic-radiologic minimally invasive rescue technique for the removal of a migrated and embedded biliary metal stent
Full text linkBile duct injuries represent a rare but potentially serious complication after laparoscopic cholecystectomy, that often need multidisciplinary therapeutic approaches. Additionally, post cholecystectomy clip migration into the biliary tree has been described, mainly because of local inflammatory processes. We present a case of a 65-year-old male with a bile duct injury and stricture after laparoscopic cholecystectomy treated endoscopically with sphincterotomy and stent positioning; initially with a plastic 10Fr stent and later with a totally covered metal stent. At the removal, the metal stent appeared proximally migrated and embedded with a surgical clip, the latter also migrated into the bile duct. The endoscopic retrieval of the stent was unsuccessful and thus a simultaneous right percutaneous transhepatic approach was adopted to liberate the stent and to facilitate the endoscopic procedure. The combined endoscopic-radiologic minimally-invasive approach seemed to be an effective and safe rescue technique, avoiding in this way complex surgical procedures
SPYGLASS © -GUIDED ELECTROHYDRAULIC LITHOTRIPSY FOR INTRAHEPATIC AND DIFFICULT COMMON BILE DUCT STONES. A TWO-YEAR EXPERIENCE IN A SINGLE SURGICAL TERTIARY CENTER
No full textSPYGLASSa-GUIDED ELECTROHYDRAULIC
LITHOTRIPSY FOR INTRAHEPATIC AND DIFFICULT
COMMON BILE DUCT STONES. A TWO-YEAR
EXPERIENCE IN A SINGLE SURGICAL TERTIARY CENTER
Pavlos Antypas*1,4
, Fabrizio Cereatti2
, Gianfranco Donatelli3
,
Annalisa Cappello4
, Chiara Eberspacher1
, Gianfranco Fanello1
,
Fausto Fiocca4
1
SURGICAL SCIENCES, SAPIENZA UNIVERSITY OF ROME, Rome, Italy;
2
Gastroenterology and Endoscopy Unit, ASST Cremona, Cremona, Italy;
3
Service d’Endoscopie Interventionnelle, Hôpital Privédes Peupliers,
Paris, France; 4
Emergency Endoscopy Unit, Policlinico Umberto I, Rome,
Italy
Background: Hepatolithiasis (HL) and difficult common bile duct (CBD) stones
represent a challenging condition when associated with anatomic variations due
to previous surgical procedures. Several endoscopic therapeutic approaches have
been proposed. A combined radiologic-endoscopic technique using electrohydraulic
or laser lithotripsy under percutaneous transhepatic cholangiography (PTC) has
been also described. The aim of our study is to evaluate the efficacy and safety of
Spyglassa-guided electrohydraulic lithotripsy (SpEHL) for HL and difficult CBD
stones. Materials and Methods: From September 2014 to September 2016 data from
40 patients undergoing to Spyglassa-guided EHL (Walz ELa) for intrahepatic and/or
difficult CBD stones were collected. All patients underwent a magnetic resonance
cholangiopancreatography (MRCP) or abdominal ultrasound (Tsunoda classification
was used). ERCP was the first line treatment for difficult CBD stones and/or HL.
Peroral SpEHL was performed in case of ERCP failure (stone diameter >20mm,
strictures). PTC was performed in case of intrahepatic (Tsunoda class III/IV) or
impacted stones associated with narrowed CBD. In these cases percutaneous
transhepatic cholangioscopy (PTCS) and SpEHL was performed. Patients with
anatomic modifications due to previous surgery with a bilio-enteric anastomosis had
a direct PTC approach with SpEHL. In cases of biliary anastomosis after liver transplantation
a PTC approach was performed only after ERCP and SpEHL failure. The
average follow-up period was 14 months. Results: Complete stone clearance was
achieved in 39/40 patients after a maximum of 3 consecutive procedures. 15 patients
presented only difficult CBD stones (3 with Billroth type II gastrectomy), 5 with
intrahepatic and CBD stones and 20 patients with only HL (10 with bilio-enteric
anastomosis, 8 with biliary anastomosis due to liver transplantation and 2 with history
of primary sclerosing cholangitis). Intrahepatic or CBD strictures were observed
in 14 patients and biopsies made with Spybitea biopsy forceps (histological report:
12 benign and 2 malign). 1 patient underwent surgery (left hepatectomy with no
histological evidence of oncological disease) after 3 procedure failures caused by a
non-dilatable left lobe biliary duct stricture. Major adverse events were: 1 (2.5%) case
of massive bleeding with the need of embolization and 4 (10%) cases of acute
cholangitis treated with medical therapy. Recurrence of stones was observed in 5
cases (10%, 2 patients with liver transplantation and 3 patients with primary sclerosing
cholangitis) successfully retreated. Conclusion: Peroral SpEHL is a safe and
effective treatment in patients who have failed standard ERCP stone removal techniques.
PTCS SpEHL seems to be very effective in patients with previous biliary tract
surgical procedures with low complication and low stones’ recurrence rate
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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