1,720,963 research outputs found
Reinfusion Drains in primary total hip arthroplasty
No full textIntroduction: Primary total hip replacement can result in a considerable
amount of blood loss. Higher pre-operative and post-operative hemoglobin
(Hb) levels are related to earlier functional recovery, higher patient satisfaction
and shorter hospital length of stay. A number of strategies to reduce
the need for blood transfusion have been employed such as retransfusion
drains.
Objectives: The goal of the study was to evaluate the effects of reinfusion
drains on hematological parameters of patients undergoing total hip arthroplasty
(THA).
Methods: We retrospectively reviewed 103 patients (reinfusion group) who
underwent THA with the use of a postoperative reinfusion drain and 100
patients (no reinfusion group) who underwent THA with no postoperative
reinfusion drain used. Preoperative variables evaluated were: age, sex and
body mass index (BMI); comorbidities; and type of anesthesia. Postoperative
variables evaluated were: Hb, hematocrit (Hct) and platelets (Plt) levels at
the first, second, third, and fourth postoperative days and at discharge. We
also assessed the total blood loss during the postoperative in-hospital stay
and the number of units of blood eventually transfused.
Results: Eighty-four (84%) patients in the reinfusion group and 42 patients
(40.8%) in the no reinfusion group were transfused with at least
one unit of blood postoperatively (1.3 ± 0.9 and 0.5 ± 0.7; p<0.001, respectively).
The need for transfusion was found to be 7 times higher in
the no reinfusion group compared to the reinfusion group. In the first and
second postoperative day, Hb levels were higher in the reinfusion group
(p = 0.002 and p<0.001, respectively). Hct levels were significantly higher
in the reinfusion group at first, second, third and fourth postoperative
days and at discharge. No other statistically significant differences were
detected.
Conclusions: Proper management of patients undergoing THA using reinfusion
drains can reduce or eliminate the need for transfusions
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
Infezioni periprotesiche di ginocchio: revisione in due tempi con spaziatori articolati preformati in cemento antibiotato
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