1,720,958 research outputs found
Hypertrophic obstructive cardiomyopathy and pregnancy: anesthesiological observations and clinical series.
No full textHypertrophic obstructive cardiomyopathy represents a genetic disorder characterized by hypertrophy, usually asymmetrical, of the ventricular musculature at the base of the septum in the left ventricular efflux tract. Patients suffering from this disorder can be extremely sensitive to small alterations in ventricular volumes, arterial pressure, cardiac frequency and rhythm. This disorder is found in pregnancy with an incidence of 0.1-0.5% and, because of its gravity, represents a contraindication which is often absolute to pregnancy. Hemodynamic variations such as those found in pregnancy, labor and delivery have complex influences on hypertrophic cardiomyopathy. Our clinical series includes 2 pregnant patients suffering from hypertrophic obstructive cardiomyopathy who both underwent caesarian section in general anesthesia, the first due to the gravity of cardiac obstruction and the second due to the emergent need to proceed after the beginning of labor. The small number of clinical cases in the literature, especially in the last few years, clearly underlines the difficulty of defining both the most correct method for delivery and the most appropriate anesthesiological techniques. In accordance with the literature and our clinical experience, we can conclude that a carefully managed pregnancy can proceed without complications in patients with moderate obstruction and that a regional anesthesiological approach is also possible with careful hemodynamic monitoring. General anesthesia, however, remains the safest method and has fewer risks for patients with serious obstruction or with worsening of their clinical condition during pregnancy
Epidural narcotics in obstetrics: maternal and foetal implications. Synopsis on the first thousand cases.
No full textEXIT procedure in a twin gestation and review of the literature
No full textPrenatal diagnosis can show masses of the fetal neck, mouth, and face that can potentially cause respiratory distress at birth. To prevent such an emergency, the EXIT (ex utero intrapartum technique) is performed: it is the intrapartum intubation of the fetus at term while still connected to the placenta. The EXIT procedure was first performed in a case of cervical teratoma. Up to now a total of 34 cases are described, mostly cervical teratomas (13 cases), lymphangiomas (7), epignathus (3); babies' outcome has been successful in 25 of them, with one death related to the procedure. Among the reported cases we are aware of only one where EXIT was performed in a twin gestation, in which the normal twin was delivered first. In our case the normal fetus was posterior to the twin with cervical malformation, requiring us to work on the latter while the former was still in the uterus. After having safely secured the airway in twin A, twin B was prompt delivered with excellent general conditions. Our limited experience enlarges the possibility to perform this prenatal procedure even in "nonstandard" conditions, such as a twin gestation, and may prove useful to those who are going to deal with such issues
Valutazione clinica sull'impiego della farmacoterapia antalgica e dei blocchi nervosi nel trattamento del dolore oncologico in ginecologia.
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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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