1,720,976 research outputs found
[New pharmacological approaches to ischemic heart disease]
No full textMajor steps have been made in the treatment of ischemic heart disease from the discovery of nitrates as antianginal medication to the techniques of percutaneous angioplasty. This incredible therapeutic progress has resulted in a reduced incidence of ischemic heart disease and related mortality and morbidity. However, statistical and epidemiological data indicate that in ischemic heart disease, despite the achievement of great success, there is a necessity for a further step toward treatment, considering the fact that the characteristics of this population are changing (increased prevalence of subendocardial infarction compared with classic transmural infarction, especially in the elderly population). Furthermore, the need for alternative therapeutic approaches to traditional ones is recognized. Ranolazine is a selective inhibitor of Na channels that prevents pathological extension of late Na current developing in the ischemic myocardial cell. This current is responsible for calcium overload, with consequent impairment of diastolic relaxation. Ranolazine reduces Na overload induced by calcium and improves diastolic relaxation and coronary subendocardial flow, without affecting hemodynamic parameters such as blood pressure, heart rate, or inotropic state of the heart, avoiding undesirable side effects. Efficacy of ranolazine has been evaluated in several trials, using clinical and instrumental endpoints (MARISA and CARISA) or, more recently, using endpoints such as mortality and reinfarction (ERICA and MERLIN-TIMI 36). Ivabradine acts through the inhibition of late Na current (also known as If), which controls the spontaneous diastolic depolarization of sinus node cells. The partial inhibition of these channels reduces the frequency of sinus node action potential initiation, resulting in decreased heart rate without effects on contractility, atrio-ventricular conduction, or repolarization. The BEAUTIFUL trial has tested whether the effect of ivabradine in lowering heart rate is able to reduce mortality and cardiovascular morbidity in patients with coronary artery disease and left ventricular systolic dysfunction. The most significant results were obtained in the subgroup of patients with life-limiting exertional angina. In this group, ivabradine significantly reduced the primary endpoint, a composite of cardiovascular death, hospitalization for fatal and nonfatal acute myocardial infarction (AMI) or heart failure, by 24%, and hospitalizations for AMI by 42%. In the subgroup of patients with baseline heart rate >70 bpm, hospitalizations for AMI and revascularization were reduced by 73% and 59%, respectively
Effects Of Two Different Combinations Of Nutraceutical Agents In Lipid Lowering And Endothelial Protection
No full text
Efficacia della terapia con atorvastatina ad alto dosaggio sulla protezione della funzione endoteliale e riduzione dei biomarkers infiammatori nei pazienti con STEMI
No full textGoing 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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