1,721,752 research outputs found
Metformin as an adjuvant therapy to dietary advice for pregnant women who are overweight or obese: the GROW randomised placebo-controlled trial
No full textConference abstract presented at: 21st Annual Conference of the British Maternal and Fetal Medicine Society, BMFMS 2019.Dodd, J
Tocolysis for assisting delivery at caesarean section
No full textBACKGROUND: Caesarean section involves making an incision in the woman's abdomen and cutting through the uterine muscle. The baby is then delivered through that incision. Difficult caesarean birth may result in injury for the infant. Medication that relaxes the uterus (tocolytic medication) may facilitate the birth of the baby at caesarean section. OBJECTIVES: To compare the use of tocolysis (routine or selective use) with no use of tocolysis or placebo at the time of caesarean section for outcomes of infant birth trauma, maternal complications (particularly postpartum haemorrhage requiring blood transfusion), and long-term measures of infant and childhood morbidity. SEARCH STRATEGY: We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (January 2006), the Cochrane Central Register of Controlled Trials (The Cochrane Library 2006, Issue 1) and PubMed (1966 to January 2006). SELECTION CRITERIA: Use of tocolytic agents (routine or selective) at caesarean section versus no use of tocolytic or placebo at caesarean section to facilitate the birth of the baby. DATA COLLECTION AND ANALYSIS: Two review authors independently assessed trial quality and extracted data. MAIN RESULTS: A single randomised trial involving 97 women was identified and included in the review. Maternal and infant health outcomes were not reported. AUTHORS' CONCLUSIONS: There is currently insufficient information available from randomised trials to support or refute the routine or selective use of tocolytic agents to facilitate infant birth at the time of caesarean section.Jodie M Dodd, Kym Rei
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
Surgical techniques for uterine incision and uterine closure at the time of caesarean section
No full textBACKGROUND: Caesarean section is a common operation. Techniques vary depending on both the clinical situation and the preferences of the operator. OBJECTIVES: To compare the effects of 1) different types of uterine incision, 2) methods of performing the uterine incision, 3) suture materials and technique of uterine closure (including single versus double layer closure of the uterine incision) on maternal health, infant health, and health care resource use. SEARCH STRATEGY: We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (November 2007). SELECTION CRITERIA: All published, unpublished, and ongoing randomised controlled trials comparing various types and closure of uterine incision during caesarean section. DATA COLLECTION AND ANALYSIS: Two authors evaluated trials for inclusion and methodological quality without consideration of their results according to the stated eligibility criteria and extracted data independently. MAIN RESULTS: We identified 30 studies, of which 15 (3972 women) were included. Ten trials compared single layer uterine closure with double layer uterine closure (2531 women), two trials compared blunt with sharp dissection at the time of the uterine incision (1241 women), and two trials compared auto-suture devices with traditional hysterotomy (300 women).Blunt dissection was associated with a reduction in mean blood loss at the time of the procedure when compared with sharp dissection of the uterine incision (one study, 945 women, mean difference (MD) -43.00, 95% confidence interval (CI) -66.12 to -19.88). There was no statistically significant difference related to need for blood transfusion (one study, 945 women, risk ratio (RR) 0.22, 95% CI 0.05 to 1.01).The use of an auto-suture instrument when compared with traditional methods of hysterotomy was associated with no difference in the amount of blood loss during the procedure (one study, 200 women, MD -87.00, 95% CI -175.09 to 1.09), but a statistically significant increase in the duration of the procedure (one study, 197 women, MD 3.30, 95% CI 0.02 to 6.62).Single layer closure compared with double layer closure was associated with a statistically significant reduction in mean blood loss (three studies, 527 women, MD -70.11, 95% CI -101.61 to -38.60); duration of the operative procedure (four studies, 645 women, MD -7.43, 95% CI -8.41 to -6.46); and presence of postoperative pain (one study, 158 women, RR 0.69, 95% CI 0.52 to 0.91). AUTHORS' CONCLUSIONS: While caesarean section is a common procedure performed on women worldwide, there is little information available to inform the most appropriate surgical technique to adopt
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
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