1,720,960 research outputs found
Atrial fibrillation screening with photo-plethysmography through a smartphone camera
No full textAims This cross-sectional study was set up to assess the feasibility of mass screening for atrial fibrillation (AF) with only the use of a smartphone. Methods and results A local newspaper published an article, allowing to subscribe for a 7-day screening period to detect AF. Screening was performed through an application that uses photo-plethysmography (PPG) technology by exploiting a smartphone camera. Participants received instructions on how to perform correct measurements twice daily, with notifications pushed through the application's software. In case of heart rhythm irregularities, raw PPG signals underwent secondary offline analysis to confirm a final diagnosis. From 12328 readers who voluntarily signed up for screening (49 +/- 14 years; 58% men), 120446 unique PPG traces were obtained. Photo-plethysmography signal quality was adequate for analysis in 92% of cases. Possible AF was detected in 136 individuals (1.1%). They were older (P<0.001), more frequently men (P<0.001), and had higher body mass index (P=0.004). In addition, participants who strictly adhered to the recommended screening frequency (i.e. twice daily) were more often diagnosed with possible AF (1.9% vs. 1.0% in individuals who did not adhere; P = 0.008). Symptoms of palpitations, confusion, and shortness of breath were more frequent in case of AF (P<0.001). The cumulative diagnostic yield for possible AF increased from 0.4% with a single heart rhythm assessment to 1.4% with screening during the entire 7-day screening period. Conclusion Mass screening for AF using only a smartphone with dedicated application based on PPG technology is feasible and attractive because of its low cost and logistic requirements.Qompium N.V. provided free use of the FibriCheckVR algorithm for every study participant during the 7-day study period. The local newspaper Het Belang van Limburg published a free article to inform its readers on this
smartphone-based algorithm and encourage people to participate in the screening programme
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
First in world implementation of a smartphone application in primary and secondary prevention of stroke
No full textWith an ageing population, the burden of atrial fibrillation (AF) and its complication of stroke continues to rise. Current screening strategies are hampered by large expenses, dedicated equipment, time investment, logistics, and medical personnel. This work introduces FibriCheck as new screening tool for the detection of AF and prevention of stroke. (1) In a systematic screening programme, FibriCheck was able to detect previously undiagnosed AF in 0.8% of the general population with 100% sensitivity, 97% specificity and 97% accuracy. (2) A nine-day completely digital mass screening programme included 12,328 participants, who on-boarded within 48 hours. 136 AF-patients (1.1%) were identified. 81 AF-cases (60%) were confirmed following consultation of a physician. (3) The diagnostic yield of the application as a long-term monitoring device in high risk patients was evaluated. AF was identified in 13%, including 5% previously undiagnosed. Compared with usual care, 10% would have received prolonged monitoring as part of the planned care-path. (4) A Markov model indicated 26 quality adjusted life years (QALY) and substantial cost savings of €1.189 per QALY gained when implementing the application in a population of 1000 stroke patients. To conclude, FibriCheck proved to be an accurate and reliable means to detect AF in unselected and selected populations in a cost-effective way
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
First in world implementation of a smartphone application in primary and secondary prevention of stroke
No full textWith an ageing population, the burden of atrial fibrillation (AF) and its complication of stroke continues to rise. Current screening strategies are hampered by large expenses, dedicated equipment, time investment, logistics, and medical personnel. This work introduces FibriCheck as new screening tool for the detection of AF and prevention of stroke. (1) In a systematic screening programme, FibriCheck was able to detect previously undiagnosed AF in 0.8% of the general population with 100% sensitivity, 97% specificity and 97% accuracy. (2) A nine-day completely digital mass screening programme included 12,328 participants, who on-boarded within 48 hours. 136 AF-patients (1.1%) were identified. 81 AF-cases (60%) were confirmed following consultation of a physician. (3) The diagnostic yield of the application as a long-term monitoring device in high risk patients was evaluated. AF was identified in 13%, including 5% previously undiagnosed. Compared with usual care, 10% would have received prolonged monitoring as part of the planned care-path. (4) A Markov model indicated 26 quality adjusted life years (QALY) and substantial cost savings of €1.189 per QALY gained when implementing the application in a population of 1000 stroke patients. To conclude, FibriCheck proved to be an accurate and reliable means to detect AF in unselected and selected populations in a cost-effective way
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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