1,721,103 research outputs found
Association between reduced fetal movements at term and abnormal uterine artery Doppler indices
No full textObjectives To evaluate the association between second-trimester uterine artery (UtA) Doppler pulsatility index (PI) with reduced fetal movements (RFM) and adverse pregnancy outcome at term. Methods This was a retrospective cohort study of all singleton pregnancies referred for routine antenatal care at a fetal medicine unit over a 5-year period. UtA Doppler indices were obtained at the time of the routine anomaly scan between 19 and 23 weeks' gestation to assess the risk for pre-eclampsia. All episodes of RFM within 1 month of the expected date of delivery were recorded. Regression and sensitivity analyses were used to assess the relationship between UtA-PI with RFM, small-for-gestational-age (SGA) fetuses and stillbirth after 36 weeks' gestation. Results Overall, 17 649 pregnancies were included in the analysis, of which 742 presented with RFM, 1494 gave birth to an SGA newborn and 53 were complicated by stillbirth after 36 weeks' gestation. Logistic regression analysis showed a significant and independent association between UtA-PI and RFM (odds ratio (OR), 5.03 (95% CI, 4.21-6.01); P < 0.001), SGA (OR 2.41 (95% CI, 2.09-2.79); P < 0.001) and stillbirth (OR 1.55 (95% CI, 1.21-1.98); P< 0.001). The association between UtA-PI and SGA was significantly stronger in women presenting with RFM than in the rest of the cohort (P < 0.001). Similarly the association between UtA-PI and RFM was significantly stronger in those pregnancies complicated by stillbirth (P < 0.001). Conclusions Compared with normal pregnancies, those complicated by RFM, SGA and stillbirth at term had higher UtA-PI at 19-23 weeks' gestation. These findings support the assertion that RFM at term is independently related to placental dysfunction and subsequent risk for SGA and stillbirth. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd
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
Fetal middle cerebral artery and umbilical artery pulsatility index: effects of maternal characteristics and medical history
No full textTo define the contribution of maternal variables which influence the measured fetal middle cerebral artery (MCA) and umbilical artery (UA) pulsatility index (PI) in the assessment of fetal wellbeing
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
Prospective first-trimester screening for trisomies by cell-free DNA testing of maternal blood in twin pregnancy
Get PDFFirst, to examine in twin pregnancies the performance of first-trimester screening for fetal trisomies 21, 18 and 13 by cell-free (cf) DNA testing of maternal blood and, second, to compare twin and singleton pregnancies regarding the distribution of fetal fraction of cfDNA and rate of failure to obtain a result
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
Screening for trisomies by cell-free DNA testing of maternal blood: consequences of a failed result
Get PDFFirst, to report the distribution of the fetal fraction of cell-free (cf) DNA and the rate of a failed cfDNA test result in trisomies 21, 18 and 13, by comparison with pregnancies unaffected by these trisomies, second, to examine the possible effects of maternal and fetal characteristics on the fetal fraction, and third, to consider the options for further management of pregnancies with a failed result
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