1,720,976 research outputs found
The new retained foreign body! Case report and review of the literature on retained foreign bodies in laparoscopic bariatric surgery
No full textThe advent of laparoscopic surgery has created a set of peculiar morbidities. As the laparoscopic devices, also the type of retained foreign bodies has changed. We present a case of unusual, apparently isolated and recurrent lung abscess, pleural effusion and poorly evident subphrenic abscess after laparoscopic gastric bypass, due to a retained Endo-Catch bag. A 27-year-old obese female underwent an uneventful laparoscopic Roux-en-Y gastric bypass. After surgery she developed a left basal lung abscess, that resolved in two weeks with heavy antibiotic therapy, while radiological abdominal imaging was apparently normal. Patient was discharged on p.o. day 30. After two months, she presented with fever and dyspnoea and no gastrointestinal complaints. Chest and abdominal computer tomography showed a left recurrent abscess with effusion but this time a 3 cm subphrenic mass with metallic clips inside was demonstrated on CT scan. Patient was treated with an explorative laparoscopy that identified an Endo-Catch bag with the jejunal blind loop inside. Postoperative left lung abscess can be a warning of a suphrenic surgical complication. Laparoscopic surgery requires even more attention to retained foreign bodies due to the reduced visibility of the surgical field. The recommendation to enforce recording of laparoscopic maneuvers is mandatory
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Gastroblastoma in old age
No full textGastroblastoma is a rare, distinctive gastric biphasic tumour affecting both sexes, with metastatic potential. To the best of our knowledge, 11 cases have been published so far, solidly supported by morphology, immunophenotype, and, in four instances, by identification of a characteristic MALAT–GLI1 fusion gene.1-6 A twelfth ‘gastroblastoma’, questionable because of the presence of cellular atypia significantly deviating from previous canonical examples, has been reported.7 A gastroblastoma‐like duodenal neoplasm has also been described.8 Finally, a series of six extragastric tumours harbouring GLI1 rearrangements has been published, showing focal cytokeratin positivity and scattered tubular structures in one case (bearing an ACTB–GLI1 fusion), leading to the proposal of an entity defined as ‘malignant epithelioid neoplasm with GLI1 fusions’.9 All reported canonical gastroblastomas occurred within the third decade of life, except for one in a patient aged 56 years. Grossly, gastroblastomas form multinodular/lobulated, often partly cystic/haemorrhagic, masses involving the gastric wall layers. Histologically, these tumours are biphasic, featuring spindle‐cell and epithelioid components, immature but non‐pleomorphic, with low mitotic activity. On immunohistochemistry, gastroblastoma variously expresses CD10, vimentin and cytokeratins, the former two prevailing in the spindle cells, and the latter prevailing in the epithelioid cells. The recently reported consistent finding of a MALAT1–GLI1 fusion gene in gastroblastoma allows a solid differential diagnosis with other biphasic neoplasms such as synovial sarcoma, carcinosarcoma, and teratoma. Intriguingly, the same genetic defect has been detected in some plexiform fibromyxomas, which are gastric mesenchymal tumours that are definitely benign, lack biphasic morphology and are most likely unrelated to gastroblastoma.6, 9 Table 1 summarises the features of the gastroblastomas published so far. Herein, we report a gastric antral tumour with morphological, immunophenotypic and genotypic features consistent with gastroblastoma in a 79‐year‐old male
Cytoreductive surgery and mitomycin C hyperthermic intraperitoneal chemotherapy with CO2 recirculation (HIPEC-CO2) for colorectal cancer peritoneal metastases: analysis of short-term outcomes
No full textPeritoneal dissemination from colorectal cancer (CRC) has long been associated with unfavorable prognosis. However, in the last decades, the combination of cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) was able to obtain up to 30% 5-year survival rate in selected centers. Despite the wide diffusion of CRS and HIPEC, until now, there are no clear recommendations on the drug of choice for HIPEC nor its technique, and safety and efficacy data of HIPEC regimens and techniques are lacking. We performed a retrospective analysis of a prospectively maintained database of 26 CRS and mitomycin C HIPEC with CO2 recirculation (HIPEC-CO2) for CRC peritoneal metastasis (PM) performed at our center. The main endpoints were morbidity, mortality, the temperature of perfusate during HIPEC and metabolic changes throughout the procedure. Morbidity was assessed by analysis of postoperative adverse events according to the Common Terminology Criteria for Adverse Events (CTCAE version 4.0). Continuous variables of Arterial Blood Gas (ABG) analysis at three time-points were compared by the Student t test. There were no postoperative deaths. The overall grade 3–4 CTCAE complications rate at 30 days was 38.4%, with ten severe adverse events occurring to six (23.0%) patients. The temperature within HIPEC perfusion maintained between 41 and 42 °C in all cases and we experienced no HIPEC-related intraoperative complications. We observed a significant difference between all baseline and pre-HIPEC ABG parameters evaluated but no statistically significant differences between pre- and post-HIPEC ABG outcomes. This study shows that mitomycin C HIPEC-CO2 is feasible and has a safety profile comparable to that of other HIPEC techniques reported in the literature. Further research is needed to validate prospectively the safety and efficacy of this technique
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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