1,721,001 research outputs found
Venous thromboembolic disease in obstetrics and gynaecology: the Scottish experience
No full textThe incidence and pattern of thromboembolic complications in obstetric and gynaecological patients in Scotland between 1981 and 1992 was investigated by analysing ICD coded data retrieved from the SMR1 and SMR2 database. The effect of mode of delivery and maternal age over 35 on risk of thromboembolism in pregnancy was also assessed. 0.076% of gynaecological episodes were subsequently complicated by thromboembolic events. Nineteen percent of those suffering thromboembolic complications within two weeks of discharge were referred back to gynaecology. The incidence of deep venous thrombosis (DVT) in those under 35 years and over 35 years was 0.615/1000 maternities and 1.216/1000 maternities respectively. Respective figures for postnatal DVT were 0.304/1000 and 0.720/1000 and for pulmonary thromboembolism (PTE), 0.108/ 1000 and 0.405/1000. In both age groups, emergency caesarean section was associated with a higher incidence of DVT than elective caesarean section and vaginal delivery
Compression stockings and posture: a comparative study of their effects on the proximal deep veins of the leg at rest
No full textGraduated compression stockings have been shown to reduce the incidence of deep venous thrombosis. While they are thought to act primarily by increasing venous flow velocity, their mode of action remains uncertain. Doppler ultrasound was employed to study the relative effects of three types of support stocking on the deep venous diameter, flow velocity and pulsatility in 10 non-pregnant female subjects. In addition, the effect of altered posture on the same parameters was assessed. Significant effects of the graduated stockings were found at the level of the popliteal vein, where a reduction in both the diameter and the amplitude of respiratory phasicity was recorded (p < 0.05). No significant increase in flow velocities was recorded. Adopting the left lateral position significantly increased flow velocity in the right common femoral vein (p < 0.05). The application of stockings in this position produced no additional increase in flow velocities, but did alter the amplitude of respiratory phasicity. These data do not support the widely held view that graduated compression stockings increase flow velocities at rest. Adopting a lateral recumbent position significantly increases flow velocity in the non-dependent leg
Thrombocytopenia, antithrombin deficiency and extensive thromboembolism in pregnancy: treatment with low-molecular-weight heparin
No full textPregnancy limits the therapeutic options for managing thrombocytopenia which occurs in 5% of patients on heparin. We describe a case of extensive thromboembolism associated with antithrombin (AT) deficiency complicated by thrombocytopenia which resolved when low-molecular-weight heparin was instituted. A primigravid woman presented at 11 weeks gestation with bilateral femoral occlusive thrombi extending above the renal veins. Investigations revealed AT deficiency, thrombocytopenia and renal infarction. After low-molecular-weight heparin was substituted for unfractionated heparin, the thrombocytopenia resolved and although the pregnancy was lost, the patient made a full recovery
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
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