1,720,960 research outputs found
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
Cystic pancreatic tumor treated by distal spleno-pancreatectomy with occasional diagnosis of neuroendocrine tumor: case report
No full textINTRODUCTION: Cystic and neuroendocrine pancreatic neoplasms are quite rare tumors which diagnosis is often difficult due to their non specific symptomatology and limited diagnostic accuracy of conventional diagnostic instruments. Their treatment is still controversial.
CASE REPORT: A young woman is admitted with abdominal pain and dyspepsia. Instrumental diagnosis reveals a cystic pancreatic lesion which seems to be malignant as CEA of pancreatic liquid is increased. The patient undergoes distal spleno-pancreatectomy and postoperative histological examination found IPMN associated with MCN and furthermore there was occasional diagnosis of a small neuroendocrine tumor in the pancreatic tail.
DISCUSSION: A correct diagnostic approach is indispensable for a correct therapeutic approach. Radical surgical treatment is indicated in all cases of main- and branch duct IPMN and in case of MCN with signs of malignant transformation. Surgical treatment is also the gold standard for pancreatic neuroendocrine tumors if they are singular and in M0 stage.
CONCLUSIONS: In case of cystic and neuroendocrine neoplasms of the pancreas the preoperative diagnostic approach is often not enough to obtain a definite diagnosis. Review of literature and this case report show that a definite diagnosis can only be done after postoperative histological examination. Recent prospective studies suggest the possibility for a follow up instead of surgical treatment for some neuroendocrine tumors
Accidental parathyroidectomy as a risk factor for postoperative hypocalcemia in thyroid surgery
No full textIntroduction. Hypocalcemia is the most common complication in thyroid surgery. The identification of risk factors is useful to
avoid postoperative hypocalcemia and prolonged hospital stay in patients who underwent total thyroidectomy. The aim of this study
was to evaluate the impact of accidental parathyroidectomy during thyroidectomy on the postoperative calcemic status of the
patients.
Materials and Methods. Clinical and pathological data of 102 patients who underwent total thyroidectomy were reviewed. We
compared postoperative serum calcium levels of 51 patients without accidental removal of the parathyroids (group A) with those of
51 patients with unintentional parathyroidectomy (group B). Furthermore, calcemic levels were stratified in relation to the number of
parathyroids accidentally removed.
Results. Biochemical postoperative hypocalcemia was observed in 40 (39%) patients overall: eleven of them belonged to
Group A and 29 to Group B. The mean value of postoperative calcemia was 8.5 mg/dL in group A and 7.9 mg/dL in Group B.
Patients with one parathyroid excised presented hypocalcemia in 50% of cases, while biochemical hypocalcemia was observed in all patients with more than one gland excised.
Conclusions. Our data suggest that unintentional parathyroidectomy during total thyroidectomy increases the incidence of
post-operative hypocalcemia. The number of glands accidentally excised influences the incidence rates of postoperative hypocalcemia
Endovenous radiofrequency obliteration of the saphenous veins in the treatment of venous insufficiency of lower legs. Our experience].
No full textOBJECTIVE: To determine the efficacy and safety of endovascular radiofrequency obliteration of refluxing greater saphenous veins in patients eligible for vein ligation and stripping
METHOD: From 2002 to 2007, 107 patients, classified a C2 CEAP, were treated. The ablation of the greater saphenous vein was performed using a radiofrequency generator and a VNUS Closer catheter, for endovascular radiofrequency ablation. This procedure avoids groin surgery. The catheter is inserted in the saphenous vein with the use of a introducer through the skin. When necessary, the procedure was complemented by phlebectomy (Muller's method). In all cases, the duplex/color ultrasound was used in guiding the pre- intra and post-operative phase.
RESULTS: The procedure was carried out in all cases without complications, with immediate improvement of clinical symptoms and immediate return to normal activities. At 5-year follow-up no recurrent varicose veins were detected
CONCLUSIONS: The endovenous radiofrequency ablation of the saphenous veins represents a valid alternative to GSF ligation and saphenous vein stripping. The rigorous application of the protocol, both before and after the operation, is an essential condition to keep complications to a minimum. Because of the long term results, the level of patient satisfaction, the ease with which the procedure is carried out, we have extended its adoption to patients with an advanced stage of the disease, whom in the past would have only been treated with strippin
Occult thyroiditis as a risk factor for postoperative hypocalcemia in thyroid surgery
No full textIntroduction: Postoperative hypocalcemia is the most incident complication in thyroid surgery. The aim of this study was to
evaluate the role of occult thyroiditis as a risk factor for postoperative hypocalcaemia in patients submitted to total thyroidectomy.
Materials and methods: The study was conduced over 118 patients who underwent total thyroidectomy for thyroid disease
other than thyroiditis. The patients were divided in two groups; those without thyroiditis (group A, 65 patients) and those with occult
thyroiditis discovered after histopathological examination of the specimen (group B, 53 patients).
Results: The mean value of calcaemia in the first postoperative day was 8.1 mg/dL in group A and 8.2 mg/dL in group B.
Biochemical hypocalcaemia was detected in 25 patients in group A and 20 in group B. Differences between groups A and B were not statistically significant.
Conclusions: Our data suggest that occult thyroiditis does not influence the incidence of postoperative hypocalcaemia in
patients who underwent total thyroidectomy. Further prospective randomized studies are necessary to confirm these finding
Mucosa Associated Lymphoid Tissue lymphoma of the thyroid gland: a case report and literature review
No full text"Mucosa associated lymphoid tissue (MALT) lymphomas are low-grade, non-Hodgkin’s B cell lymphomas, mainly occurring in the gastrointestinal tract, but also in other tissues. We describe the management of a patient with hypothyroidism, tracheoesophageal compressive symptoms and chest tightness affected by a thyroid MALT lymphoma. The patient underwent debulking thyroidectomy and temporary tracheostomy in order to reduce dysphonia and dysphagia, followed by adjuvant chemotherapy and subsequently radiation therapy. A CT scan performed at the end of radiotherapy 6 months after surgery revealed remnants of residual tissue from the thyroidectomy without any pathological findings.
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