1,721,014 research outputs found
Mancata risposta al trattamento con imidocarb dipropionato, doxiciclina e clindamicina in cani con infezione asintomatica da Hepatozoon canis
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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
Cardiovascular effects of continuous positive airway pressure (CPAP) in dogs under anesthesiaassessed by Doppler echocardiography
No full textGeneral anesthesia impairs respiratory functionby the development of atelectasis in association with alteredventilation at pulmonary bases1. Applying Continuous Positive Airways Pressure (CPAP) in spontaneously breathing patients reduce the work of breathing, increases functional residualcapacity and is often recommended to prevent orreduce alveolar collapse1. In human medicine it has been widely recognized that an increase in intra-thoracic pressure is associated with a decrease in cardiac outputbecause of the reduction of venous return2. Nevertheless, conflictingresults (increases, decreases, or no change) in CO have beenreported and it was studied that the effects of CPAP on cardiac function were influenced by increasing CPAP levels. Doppler echocardiography represents a way to investigate how cardiac parameters can be affected and can change during CPAP application. What about CPAP application and its cardiovascular consequences in dogs?
Aim of the study
The aim of this study is to investigate by Doppler echocardiographythe cardiovascular effects of a low level of CPAP(5 cm H2O) in dogs under anesthesia.
Materials and Methods
20 dogs have been enrolled in the study and divided into two groups. Both groups underwent anesthesia with a standard protocol and in Group A (10 dogs) CPAP was administered (5 cmH2O). Group B (10 dogs) served as control group and did not receive CPAP. Cardiovascular parameters (heart rate, mean arterial pressure and echocardiographic indices) were registered before (T0) and 15 minutes after anesthesia induction (T1), during anesthesia with or without CPAP(T2) and during recovery (T3).All patients were anesthetizedwith acepromazine (20 μg/kg), morphine (0.3 mg/kg), propofol (4 mg/kg) and isoflurane (end-tidal concentration 1.3 %)in spontaneous ventilation. Standard echocardiography (Esaote ultrasound system MyLab30) was performed usinga 2.5 MHz transducer. The following parameters were calculated as indicators of cardiovascular function: ejection fraction (EF%), left and right cardiac index (CI), left ventricle end diastolic volume index (LV-EDVI ml/m2), ratio of isovolumetric contraction time to ejection time (IVCT/ET), ratio of early rapid filling peak to atrial peak filling of transatrioventricular inflow (E/A), time velocity integral of atrioventricular inflow (TVI), aortic max velocity (AoVmax) and pulmonary max velocity (P Vmax).
Results and Conclusions
On the whole no statistical differences have been revealed in cardiovascular parameters at T2 compared to T1 in both groups.Interestingly a significant difference was revealed in EF between CPAP group and control group at T2. Myocardial diastolic properties remained unchanged. The right cardiac index do not change.Results of this study suggest not only that application of low levels of CPAP during anesthesia of healthy dogs does not negatively affect cardiac function and hemodynamic parameters, but also that it could positivelyinfluence the global left ventricular systolic function. In conclusion the application of this level of CPAP during anesthesia in healthy dogs could be considered safe.
References
1Russo et al, 2013. J. CLIN. ANESTH. 25, 314-320.2Huemer et al, 1994. CHEST 106, 67-7
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
Unsual giant cyst as a consequence of the ovarian remnant syndrome in a bitch
No full textThe canine ovary is a common place for the development of cystic structures with an incidence of80% of all canine ovaries diseases (Dow, 1960). In the bitch, the cystic pathology of the ovary includes ovarian, epithelial and stromal cysts, and paraovaric cysts (McEntee et al., 1990). Those cysts are stromal, classically distinct in follicular and luteinic. Parovarian cysts originating from remnants of mesonephric or paramesonephric tubules and ducts can also occur adjacent to the ovaries (Johnston et al. 2001 )
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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