The Experts below are selected from a list of 40950 Experts worldwide ranked by ideXlab platform

Ralph B Dagostino - One of the best experts on this subject based on the ideXlab platform.

  • propensity scores in Cardiovascular Research
    Circulation, 2007
    Co-Authors: Ralph B Dagostino
    Abstract:

    Propensity scores have been used to reduce bias in observational studies in many fields and are becoming more widely used in Cardiovascular Research.1 The goal of this statistical primer is to present the definition of propensity scores and to illustrate their use by describing some recent examples found in the Cardiovascular disease Research literature. Large-scale epidemiological cohort studies such as the Multi-Ethnic Study of Atherosclerosis (MESA)2 are designed to follow a large sample of participants over time without active administration of any interventions. Within MESA, lack of randomization can complicate potential treatment comparisons such as the impact of β-blocker versus angiotensin-converting enzyme inhibitor usage. Nonrandomized comparisons may also arise from within a randomized clinical trial. For instance, the Clopidogrel as Adjunctive Reperfusion Therapy - Thrombolysis in Myocardial Infarction 28 (CLARITY-TIMI 28) trial3 is a randomized study that compares clopidogrel with placebo in 3491 ST-elevation myocardial infarction patients aged 18 to 75 years who have undergone fibrinolysis. In addition to the primary end points, investigators wished to compare the effects of low molecular weight heparin with unfractionated heparin on angiographic and clinical outcomes in participants.4 These treatments were not randomly assigned. In studies such as these, the treatment groups may markedly differ with respect to the observed pretreatment covariates measured on participants. These differences could lead to biased estimates of treatment effects. The propensity score for an individual, defined as the conditional probability of being treated given the individual’s covariates, can be used to balance the covariates in the 2 groups and thus reduce this bias. In a randomized experiment, the randomization of participants to different treatments minimizes the chance of differences on observed or unobserved covariates. However, in nonrandomized studies, systematic differences can exist between treatment groups. To control for this potential bias, information on measured …

Alan S Go - One of the best experts on this subject based on the ideXlab platform.

  • trends in incidence of hospitalized acute myocardial infarction in the Cardiovascular Research network cvrn
    The American Journal of Medicine, 2017
    Co-Authors: Kristi Reynolds, Alan S Go, Andrea E Cassidybushrow, Thomas K Leong, Denise M Boudreau, Stephen P Fortmann, Robert J Goldberg, Jerry H Gurwitz
    Abstract:

    Abstract Background Monitoring trends in Cardiovascular events can provide key insights into the effectiveness of prevention efforts. Leveraging data from electronic health records provides a unique opportunity to examine contemporary, community-based trends in acute myocardial infarction hospitalizations. Methods We examined trends in hospitalized acute myocardial infarction incidence among adults aged ≥25 years in 13 US health plans in the Cardiovascular Research Network. The first hospitalization per member for acute myocardial infarction overall and for ST-segment elevation myocardial infarction and non-ST-segment elevation myocardial infarction was identified by International Classification of Diseases, Ninth Revision, Clinical Modification primary discharge codes in each calendar year from 2000 through 2008. Age- and sex-adjusted incidence was calculated per 100,000 person-years using direct adjustment with 2000 US census data. Results Between 2000 and 2008, we identified 125,435 acute myocardial infarction hospitalizations. Age- and sex-adjusted incidence rates (per 100,000 person-years) of acute myocardial infarction decreased an average 3.8%/y from 230.5 in 2000 to 168.6 in 2008. Incidence of ST-segment elevation myocardial infarction decreased 8.7%/y from 104.3 in 2000 to 51.7 in 2008, whereas incidence of non-ST-segment elevation myocardial infarction increased from 126.1 to 129.4 between 2000 and 2004 and then decreased thereafter to 116.8 in 2008. Age- and sex-specific incidence rates generally reflected similar patterns, with relatively larger decreases in ST-segment elevation myocardial infarction rates in women compared with men. As compared with 2000, the age-adjusted incidence of ST-segment elevation myocardial infarction in 2008 was 48% lower among men and 61% lower among women. Conclusions and Relevance Among a large, diverse, multicenter community-based insured population, there were significant decreases in incidence of hospitalized acute myocardial infarction and the more serious ST-segment elevation myocardial infarctions between 2000 and 2008. Decreases in ST-segment elevation myocardial infarctions were most pronounced among women. While ecologic in nature, these secular decreases likely reflect, at least in part, results of improvement in primary prevention efforts.

  • the Cardiovascular Research network a new paradigm for Cardiovascular quality and outcomes Research
    Circulation-cardiovascular Quality and Outcomes, 2008
    Co-Authors: Alan S Go, David J Magid, Barbara L Wells, Sue Hee Sung, Andrea E Cassidybushrow, Robert T Greenlee, Robert D Langer, Tracy A Lieu, Karen L Margolis, Frederick A Masoudi
    Abstract:

    Background— A clear need exists for a more systematic understanding of the epidemiology, diagnosis, and management of Cardiovascular diseases. More robust data are also needed on how well clinical trials are translated into contemporary community practice and the associated resource use, costs, and outcomes. Methods and Results— The National Heart, Lung, and Blood Institute recently established the Cardiovascular Research Network, which represents a new paradigm to evaluate the epidemiology, quality of care, and outcomes of Cardiovascular disease and to conduct future clinical trials using a community-based model. The network includes 15 geographically distributed health plans with dedicated Research centers, National Heart, Lung, and Blood Institute representatives, and an external collaboration and advisory committee. Cardiovascular Research network sites bring complementary content and methodological expertise and a diverse population of ≈11 million individuals treated through various health care deliv...

Dorairaj Prabhakaran - One of the best experts on this subject based on the ideXlab platform.

  • Disparities in Cardiovascular Research output and citations from 52 African countries: a time-trend, bibliometric analysis (1999-2008).
    Journal of the American Heart Association, 2015
    Co-Authors: Gerald S. Bloomfield, Abigail S. Baldridge, Anubha Agarwal, Mark D. Huffman, Lisandro D. Colantonio, Ehete Bahiru, Vamadevan S. Ajay, Poornima Prabhakaran, Grant Lewison, Dorairaj Prabhakaran
    Abstract:

    Background Cardiovascular Research output and citations of publications from Africa have historically been low yet may be increasing. However, data from the continent are limited. Methods and Results To evaluate the Cardiovascular Research output and citations from 52 African countries between 1999 and 2008, we created a bibliometric filter to capture Cardiovascular Research articles published in the Web of Knowledge based on specialist journals and title words. Two coauthors with expertise in Cardiovascular medicine tested and refined this filter to achieve >90% precision and recall. We matched retrieved records with their associated citation reports and calculated the running 5‐year citation count postpublication, including the year of publication. Publications from Africa were identified by author addresses. South Africa published 872 Cardiovascular Research papers, Egypt 393, Tunisia 264, and Nigeria 192 between 1999 and 2008. The number of publications increased over the time period for a small number of countries (range 0.1 to 4.8 more publications per year by fractional count). Most countries' citations were low (

  • global Cardiovascular Research output citations and collaborations a time trend bibliometric analysis 1999 2008
    PLOS ONE, 2013
    Co-Authors: Mark D. Huffman, Gerald S. Bloomfield, Abigail S. Baldridge, Lisandro D. Colantonio, Vamadevan S. Ajay, Poornima Prabhakaran, Grant Lewison, Dorairaj Prabhakaran
    Abstract:

    Introduction Health Research is one mechanism to improve population-level health and should generally match the health needs of populations. However, there have been limited data to assess the trends in national-level Cardiovascular Research output, even as Cardiovascular disease [CVD] has become the leading cause of morbidity and mortality worldwide. Materials and Methods We performed a time trends analysis of Cardiovascular Research publications (1999–2008) downloaded from Web of Knowledge using a iteratively-tested Cardiovascular bibliometric filter with >90% precision and recall. We evaluated Cardiovascular Research publications, five-year running actual citation indices [ACIs], and degree of international collaboration measured through the ratio of the fractional count of addresses from one country against all addresses for each publication. Results and Discussion Global Cardiovascular publication volume increased from 40 661 publications in 1999 to 55 284 publications in 2008, which represents a 36% increase. The proportion of Cardiovascular publications from high-income, Organization for Economic Cooperation and Development [OECD] countries declined from 93% to 84% of the total share over the study period. High-income, OECD countries generally had higher fractional counts, which suggest less international collaboration, than lower income countries from 1999–2008. There was an inverse relationship between Cardiovascular publications and age-standardized CVD morbidity and mortality rates, but a direct, curvilinear relationship between Cardiovascular publications and Human Development Index from 1999–2008. Conclusions Cardiovascular health Research output has increased substantially in the past decade, with a greater share of citations being published from low- and middle-income countries. However, low- and middle-income countries with the higher burdens of Cardiovascular disease continue to have lower Research output than high-income countries, and thus require targeted Research investments to improve Cardiovascular health.

Islam Y Elgendy - One of the best experts on this subject based on the ideXlab platform.

  • Correlation of Altmetric Attention Score With Article Citations in Cardiovascular Research
    Journal of the American College of Cardiology, 2018
    Co-Authors: Ashraf Fathy Barakat, Nayef Nimri, Mohamed Shokr, Hend Mansoor, Mourad Senussi, Ahmad Masri, Ahmed N Mahmoud, Dhruv Mahtta, Mohammad Khalid Mojadidi, Islam Y Elgendy
    Abstract:

    Social media outlets, particularly Twitter, have gained interest among the Cardiovascular community as a modality for dissemination of Cardiovascular Research [(1)][1]. Online attention scores have emerged as a tool to assess the performance of scholarly articles on Web-based media and social

Karin R. Sipido - One of the best experts on this subject based on the ideXlab platform.

  • ISSI - Using Bibliometrics-aided Retrieval to Delineate the Field of Cardiovascular Research.
    2020
    Co-Authors: Karin R. Sipido, Wolfgang Glänzel
    Abstract:

    A hybrid search strategy, using lexical and citation based methods, is presented in this paper as a robust method to delineate the broad field of Cardiovascular Research. Overall, this study aims to provide scientifically reliable and accurate data driven evidence about Cardiovascular Research by establishing a dataset of published Research in this field. A workflow is presented that outlines the methods carried out to establish a core dataset based on a core set of journals, to identify and use search terms to detect a broader dataset, and then to apply measures of similarities between the citations of these two datasets to ensure relevance of the final dataset. The final core set of journals established comprises of 120 unique journals covered in Thomson Reuters Web of Science Core Collection (WoS) database including a total of 320,647 documents from 1991 to 2013. The search terms utilised include 107 cardio-specific terms that initially identify 1.8 million unique documents when searching the title, abstract and keywords. Upon application of the citation-based similarity measures the final combined dataset consists of 845,071 publications. Overall, establishing a relevant dataset of Cardiovascular Research means placing a greater emphasis on having a precise dataset, reducing recall in the process. Conference Topic Methods and techniques

  • A Changing Landscape in Cardiovascular Research Publication Output: Bridging the Translational Gap.
    Journal of the American College of Cardiology, 2018
    Co-Authors: Bart Thijs, Wolfgang Glänzel, Karin R. Sipido
    Abstract:

    Abstract The concern about predominance of basic discovery Research and lack of translation into clinical medicine, and segregation between these Research communities, led the authors to study these Research communities through mapping networks of publications and cross-references. Cardiovascular Research from 1993 to 2013 was published in 565 journals, including 104 new journals. Only 50% were published in core Cardiovascular journals, such as the Journal of the American College of Cardiology, whereas one-half of Cardiovascular publications were found in broader biomedical/multidisciplinary journals. The growth of the clinical journal community and merging into one broad journal community suggests a decreasing dichotomy between basic/preclinical and clinical Research, potentially contributing to bridging the translational gap.

  • mapping cross border collaboration and communication in Cardiovascular Research from 1992 to 2012
    European Heart Journal, 2016
    Co-Authors: Wolfgang Glänzel, Karin R. Sipido
    Abstract:

    Aims The growing burden of Cardiovascular disease requires growth in Research and innovation. We examine world-wide participation and citation impact across the Cardiovascular Research landscape from 1992 to 2012; we investigate cross-fertilization between countries and examine whether cross-border collaboration affects impact. Methods and Results State-of-the-art bibliometric methods and indicators are used to identify Cardiovascular publications from the Web of Science, and to map trends over time in output, citation impact, and collaboration. The publication output in Cardiovascular Research has grown steadily from 1992 to 2012 with increased participation worldwide. China has the highest growth as relative share. The USA share initially predominated yet has reduced steadily. Over time, the EU-27 supra-national region has increased its participation above the USA, though on average it has not had greater citation impact than the USA. However, a number of European countries, as well as Australia and Canada, have improved their absolute and relative citation impact above that of the USA by 2006–2012. Europe is a hub of cross-fertilization with strengthening collaborations and strong citation links; the UK, Germany, and France remain central in this network. The USA has the highest number of strong citation links with other countries. All countries, but especially smaller, highly collaborative countries, have higher citation impact for their internationally collaborative Research when compared with their domestic publications. Conclusion Participation in Cardiovascular Research is growing but growth and impact show wide variability between countries. Cross-border collaboration is increasing, in particular within the EU, and is associated with greater citation impact.

  • Spotlight on atrial fibrillation in Cardiovascular Research.
    Cardiovascular Research, 2016
    Co-Authors: Karin R. Sipido
    Abstract:

    As introduced by the Guest Editors of the current Spotlight Issue,1 atrial fibrillation (AF) represents a major medical need and is, fortunately, also a very active field of novel discoveries and Research with strong translational potential, often in bedside–bench–bedside reiterative cycles. At the occasion of this Spotlight Issue, the journal presents a collection of relevant original Research articles and short reviews in the field of AF that were recently published in Cardiovascular Research and provides free access to these. The collection can be found here . Many of these articles relate to topics covered …

  • Hot topics and networks in Cardiovascular Research
    Cardiovascular Research, 2015
    Co-Authors: Wouter Vandevelde, Karin R. Sipido
    Abstract:

    ‘Publish or perish’ refers to the essence of journals as instruments for sharing novel and reliable information to advance scientific knowledge. Editors are expected to present high-quality, novel, and relevant studies to the community by a process of review and selection from submitted manuscripts. Peer review is an essential part of this selection process providing expert input on all three aspects for the final editorial decision. In addition, regular evaluation of the outcome of the editorial work is essential to guide the process. ISI provides metrics of which the impact factor is best-known, but there are many others. All of these give single numerical value to the aggregate of the articles but do not inform about the content of the journal. Here, after 3 years in office, we wanted to take stock of the Research published in Cardiovascular Research in 2013 and 2014. Are we on track for the impact and visibility we aim to achieve? What topics are emerging? Have publication policies provided more visibility to these publications? Taking a global view of the results of the first 2 years, the topics of the papers published and their visibility in the Research community, is a useful step in analysing the decisions made in the past. Overall, 379 original Research articles and 80 reviews were published in Cardiovascular Research in 2013 and 2014. One of the main indicators of visibility of these publications is the number of citations obtained from Web of Science online on 21 September 2015, totalling 3199 citations. Publications in Cardiovascular Research enjoy a high visibility, with an average citation rate of 7 citations per publication, a low percentage of only 7% that have …