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Willem L, Abrams S, Franco N, Coletti P, Libin PJK, Wambua J, Couvreur S, André E, Wenseleers T, Mao Z, Torneri A, Faes C, Beutels P, Hens N. The impact of quality-adjusted life years on evaluating COVID-19 mitigation strategies: lessons from age-specific vaccination roll-out and variants of concern in Belgium (2020-2022). BMC Public Health 2024; 24:1171. [PMID: 38671366 PMCID: PMC11047051 DOI: 10.1186/s12889-024-18576-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND When formulating and evaluating COVID-19 vaccination strategies, an emphasis has been placed on preventing severe disease that overburdens healthcare systems and leads to mortality. However, more conventional outcomes such as quality-adjusted life years (QALYs) and inequality indicators are warranted as additional information for policymakers. METHODS We adopted a mathematical transmission model to describe the infectious disease dynamics of SARS-COV-2, including disease mortality and morbidity, and to evaluate (non)pharmaceutical interventions. Therefore, we considered temporal immunity levels, together with the distinct transmissibility of variants of concern (VOCs) and their corresponding vaccine effectiveness. We included both general and age-specific characteristics related to SARS-CoV-2 vaccination. Our scenario study is informed by data from Belgium, focusing on the period from August 2021 until February 2022, when vaccination for children aged 5-11 years was initially not yet licensed and first booster doses were administered to adults. More specifically, we investigated the potential impact of an earlier vaccination programme for children and increased or reduced historical adult booster dose uptake. RESULTS Through simulations, we demonstrate that increasing vaccine uptake in children aged 5-11 years in August-September 2021 could have led to reduced disease incidence and ICU occupancy, which was an essential indicator for implementing non-pharmaceutical interventions and maintaining healthcare system functionality. However, an enhanced booster dose regimen for adults from November 2021 onward could have resulted in more substantial cumulative QALY gains, particularly through the prevention of elevated levels of infection and disease incidence associated with the emergence of Omicron VOC. In both scenarios, the need for non-pharmaceutical interventions could have decreased, potentially boosting economic activity and mental well-being. CONCLUSIONS When calculating the impact of measures to mitigate disease spread in terms of life years lost due to COVID-19 mortality, we highlight the impact of COVID-19 on the health-related quality of life of survivors. Our study underscores that disease-related morbidity could constitute a significant part of the overall health burden. Our quantitative findings depend on the specific setup of the interventions under review, which is open to debate or should be contextualised within future situations.
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Affiliation(s)
- Lander Willem
- Department of Family Medicine and Population Health, Antwerp, Belgium.
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium.
| | - Steven Abrams
- Department of Family Medicine and Population Health, Antwerp, Belgium
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Nicolas Franco
- Data Science Institute, Hasselt University, Hasselt, Belgium
- Namur Institute for Complex Systems (naXys) and Department of Mathematics, University of Namur, Namur, Belgium
| | - Pietro Coletti
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Pieter J K Libin
- Data Science Institute, Hasselt University, Hasselt, Belgium
- Artificial Intelligence Lab, Vrije Universiteit Brussel, Brussels, Belgium
- Rega Institute for Medical Research, Clinical and Epidemiological Virology, University of Leuven, Leuven, Belgium
| | - James Wambua
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Simon Couvreur
- Department of Epidemiology and public health, Sciensano, Brussel, Belgium
| | - Emmanuel André
- National Reference Centre for Respiratory Pathogens, University Hospitals Leuven, Leuven, Belgium
- Department of Microbiology, Immunology and Transplantation, University of Leuven, Leuven, Belgium
| | - Tom Wenseleers
- Laboratory of Socioecology and Social Evolution, University of Leuven, Leuven, Belgium
| | - Zhuxin Mao
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
| | - Andrea Torneri
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Christel Faes
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | - Philippe Beutels
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- School of Public Health and Community Medicine, The University of New South Wales, Sydney, Australia
| | - Niel Hens
- Centre for Health Economic Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- Data Science Institute, Hasselt University, Hasselt, Belgium
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Sherratt K, Srivastava A, Ainslie K, Singh DE, Cublier A, Marinescu MC, Carretero J, Garcia AC, Franco N, Willem L, Abrams S, Faes C, Beutels P, Hens N, Müller S, Charlton B, Ewert R, Paltra S, Rakow C, Rehmann J, Conrad T, Schütte C, Nagel K, Abbott S, Grah R, Niehus R, Prasse B, Sandmann F, Funk S. Characterising information gains and losses when collecting multiple epidemic model outputs. Epidemics 2024; 47:100765. [PMID: 38643546 DOI: 10.1016/j.epidem.2024.100765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 01/25/2024] [Accepted: 03/26/2024] [Indexed: 04/23/2024] Open
Abstract
BACKGROUND Collaborative comparisons and combinations of epidemic models are used as policy-relevant evidence during epidemic outbreaks. In the process of collecting multiple model projections, such collaborations may gain or lose relevant information. Typically, modellers contribute a probabilistic summary at each time-step. We compared this to directly collecting simulated trajectories. We aimed to explore information on key epidemic quantities; ensemble uncertainty; and performance against data, investigating potential to continuously gain information from a single cross-sectional collection of model results. METHODS We compared projections from the European COVID-19 Scenario Modelling Hub. Five teams modelled incidence in Belgium, the Netherlands, and Spain. We compared July 2022 projections by incidence, peaks, and cumulative totals. We created a probabilistic ensemble drawn from all trajectories, and compared to ensembles from a median across each model's quantiles, or a linear opinion pool. We measured the predictive accuracy of individual trajectories against observations, using this in a weighted ensemble. We repeated this sequentially against increasing weeks of observed data. We evaluated these ensembles to reflect performance with varying observed data. RESULTS By collecting modelled trajectories, we showed policy-relevant epidemic characteristics. Trajectories contained a right-skewed distribution well represented by an ensemble of trajectories or a linear opinion pool, but not models' quantile intervals. Ensembles weighted by performance typically retained the range of plausible incidence over time, and in some cases narrowed this by excluding some epidemic shapes. CONCLUSIONS We observed several information gains from collecting modelled trajectories rather than quantile distributions, including potential for continuously updated information from a single model collection. The value of information gains and losses may vary with each collaborative effort's aims, depending on the needs of projection users. Understanding the differing information potential of methods to collect model projections can support the accuracy, sustainability, and communication of collaborative infectious disease modelling efforts.
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Affiliation(s)
| | | | - Kylie Ainslie
- Dutch National Institute of Public Health and the Environment (RIVM), Bilthoven, Netherlands; School of Public Health, University of Hong Kong, Hong Kong Special Administrative Region
| | | | | | | | | | | | | | | | - Steven Abrams
- University of Antwerp, Antwerp, Belgium; UHasselt, Hasselt, Belgium
| | | | | | - Niel Hens
- University of Antwerp, Antwerp, Belgium; UHasselt, Hasselt, Belgium
| | | | | | | | | | | | | | - Tim Conrad
- Zuse Institute Berlin (ZIB), Berlin, Germany
| | | | - Kai Nagel
- Technische Universität Berlin, Berlin, Germany
| | - Sam Abbott
- London School of Hygiene & Tropical Medicine, London, UK
| | | | | | | | | | - Sebastian Funk
- London School of Hygiene & Tropical Medicine, London, UK
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Angeli L, Caetano CP, Franco N, Abrams S, Coletti P, Van Nieuwenhuyse I, Pop S, Hens N. Who acquires infection from whom? A sensitivity analysis of transmission dynamics during the early phase of the COVID-19 pandemic in Belgium. J Theor Biol 2024; 581:111721. [PMID: 38218529 DOI: 10.1016/j.jtbi.2024.111721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 12/23/2023] [Accepted: 12/28/2023] [Indexed: 01/15/2024]
Abstract
Age-related heterogeneity in a host population, whether due to how individuals mix and contact each other, the nature of host-pathogen interactions defining epidemiological parameters, or demographics, is crucial in studying infectious disease dynamics. Compartmental models represent a popular approach to address the problem, dividing the population of interest into a discrete and finite number of states depending on, for example, individuals' age and stage of infection. We study the corresponding linearised system whose operator, in the context of a discrete-time model, equates to a square matrix known as the next generation matrix. Performing formal perturbation analysis of the entries of the aforementioned matrix, we derive indices to quantify the age-specific variation of its dominant eigenvalue (i.e., the reproduction number) and explore the relevant epidemiological information we can derive from the eigenstructure of the matrix. The resulting method enables the assessment of the impact of age-related population heterogeneity on virus transmission. In particular, starting from an age-structured SEIR model, we demonstrate the use of this approach for COVID-19 dynamics in Belgium. We analyse the early stages of the SARS-CoV-2 spread, with particular attention to the pre-pandemic framework and the lockdown lifting phase initiated as of May 2020. Our results, influenced by our assumption on age-specific susceptibility and infectiousness, support the hypothesis that transmission was only influenced to a small extent by children in the age group [0,18) and adults over 60 years of age during the early phases of the pandemic and up to the end of July 2020.
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Affiliation(s)
- Leonardo Angeli
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Hasselt University, Hasselt, Belgium; Data Science Institute (DSI), Hasselt University, Hasselt, Belgium.
| | - Constantino Pereira Caetano
- Departamento de Epidemiologia, Instituto Nacional de Saúde Doutor Ricardo Jorge, Lisboa, Lisbon, Portugal; Center for Computational and Stochastic Mathematics, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal
| | - Nicolas Franco
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Hasselt University, Hasselt, Belgium; Namur Institute for Complex Systems (naXys) and Department of Mathematics, University of Namur, Namur, Belgium
| | - Steven Abrams
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Hasselt University, Hasselt, Belgium; Data Science Institute (DSI), Hasselt University, Hasselt, Belgium; Global Health Institute (GHI), Department of Family Medicine and Population Health, University of Antwerp, Antwerp, Belgium
| | - Pietro Coletti
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Hasselt University, Hasselt, Belgium; Data Science Institute (DSI), Hasselt University, Hasselt, Belgium
| | - Inneke Van Nieuwenhuyse
- Data Science Institute (DSI), Hasselt University, Hasselt, Belgium; Computational Mathematics, Hasselt University, Hasselt, Belgium
| | - Sorin Pop
- Data Science Institute (DSI), Hasselt University, Hasselt, Belgium
| | - Niel Hens
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Hasselt University, Hasselt, Belgium; Data Science Institute (DSI), Hasselt University, Hasselt, Belgium; Centre for Health Economics Research and Modelling Infectious Diseases, Vaxinfectio, University of Antwerp, Antwerp, Belgium
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Devleesschauwer B, Willem L, Jurčević J, Smith P, Scohy A, Wyper GMA, Pires SM, Van Goethem N, Beutels P, Franco N, Abrams S, Van Cauteren D, Speybroeck N, Hens N, De Pauw R. The direct disease burden of COVID-19 in Belgium in 2020 and 2021. BMC Public Health 2023; 23:1707. [PMID: 37667264 PMCID: PMC10476343 DOI: 10.1186/s12889-023-16572-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/21/2023] [Indexed: 09/06/2023] Open
Abstract
BACKGROUND Burden of disease estimates have become important population health metrics over the past decade to measure losses in health. In Belgium, the disease burden caused by COVID-19 has not yet been estimated, although COVID-19 has emerged as one of the most important diseases. Therefore, the current study aims to estimate the direct COVID-19 burden in Belgium, observed despite policy interventions, during 2020 and 2021, and compare it to the burden from other causes. METHODS Disability-adjusted life years (DALYs) are the sum of Years Lived with Disability (YLDs) and Years of Life Lost (YLLs) due to disease. DALYs allow comparing the burden of disease between countries, diseases, and over time. We used the European Burden of Disease Network consensus disease model for COVID-19 to estimate DALYs related to COVID-19. Estimates of person-years for (a) acute non-fatal disease states were calculated from a compartmental model, using Belgian seroprevalence, social contact, hospital, and intensive care admission data, (b) deaths were sourced from the national COVID-19 mortality surveillance, and (c) chronic post-acute disease states were derived from a Belgian cohort study. RESULTS In 2020, the total number of COVID-19 related DALYs was estimated at 253,577 [252,541 - 254,739], which is higher than in 2021, when it was 139,281 [136,704 - 142,306]. The observed COVID-19 burden was largely borne by the elderly, and over 90% of the burden was attributable to premature mortality (i.e., YLLs). In younger people, morbidity (i.e., YLD) contributed relatively more to the DALYs, especially in 2021, when vaccination was rolled out. Morbidity was mainly attributable to long-lasting post-acute symptoms. CONCLUSION COVID-19 had a substantial impact on population health in Belgium, especially in 2020, when COVID-19 would have been the main cause of disease burden if all other causes had maintained their 2019 level.
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Affiliation(s)
- Brecht Devleesschauwer
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
- Department of Translational Physiology, Infectiology and Public Health, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Lander Willem
- Department of Family Medicine and Public Health, University of Antwerp, Antwerp, Belgium
- Centre for Health Economic Research and Modelling Infectious Diseases (CHERMID), Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Jure Jurčević
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
| | - Pierre Smith
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
- Institute of Health and Society (IRSS), Université Catholique de Louvain, Brussels, Belgium
| | - Aline Scohy
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
| | - Grant M A Wyper
- School of Health & Wellbeing, University of Glasgow, Glasgow, UK
| | | | - Nina Van Goethem
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
| | - Philippe Beutels
- Centre for Health Economic Research and Modelling Infectious Diseases (CHERMID), Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Nicolas Franco
- Data Science Institute, Interuniversity Institute of Biostatistics and statistical Bioinformatics (I-BioStat), UHasselt, Hasselt, Belgium
- Namur Institute for Complex Systems (naXys) and Department of Mathematics, University of Namur, Namur, Belgium
| | - Steven Abrams
- Department of Family Medicine and Public Health, University of Antwerp, Antwerp, Belgium
- Data Science Institute, Interuniversity Institute of Biostatistics and statistical Bioinformatics (I-BioStat), UHasselt, Hasselt, Belgium
| | | | - Niko Speybroeck
- Institute of Health and Society, Université catholique de Louvain, Brussels, Belgium
| | - Niel Hens
- Centre for Health Economic Research and Modelling Infectious Diseases (CHERMID), Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
- Data Science Institute, Interuniversity Institute of Biostatistics and statistical Bioinformatics (I-BioStat), UHasselt, Hasselt, Belgium
| | - Robby De Pauw
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium.
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium.
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Lajot A, Wambua J, Coletti P, Franco N, Brondeel R, Faes C, Hens N. How contact patterns during the COVID-19 pandemic are related to pre-pandemic contact patterns and mobility trends. BMC Infect Dis 2023; 23:410. [PMID: 37328811 DOI: 10.1186/s12879-023-08369-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 06/02/2023] [Indexed: 06/18/2023] Open
Abstract
BACKGROUND Non-pharmaceutical interventions (NPIs) were adopted in Belgium in order to decrease social interactions between people and as such decrease viral transmission of SARS-CoV-2. With the aim to better evaluate the impact of NPIs on the evolution of the pandemic, an estimation of social contact patterns during the pandemic is needed when social contact patterns are not available yet in real time. METHODS In this paper we use a model-based approach allowing for time varying effects to evaluate whether mobility and pre-pandemic social contact patterns can be used to predict the social contact patterns observed during the COVID-19 pandemic between November 11, 2020 and July 4, 2022. RESULTS We found that location-specific pre-pandemic social contact patterns are good indicators for estimating social contact patterns during the pandemic. However, the relationship between both changes with time. Considering a proxy for mobility, namely the change in the number of visitors to transit stations, in interaction with pre-pandemic contacts does not explain the time-varying nature of this relationship well. CONCLUSION In a situation where data from social contact surveys conducted during the pandemic are not yet available, the use of a linear combination of pre-pandemic social contact patterns could prove valuable. However, translating the NPIs at a given time into appropriate coefficients remains the main challenge of such an approach. In this respect, the assumption that the time variation of the coefficients can somehow be related to aggregated mobility data seems unacceptable during our study period for estimating the number of contacts at a given time.
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Affiliation(s)
- Adrien Lajot
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium.
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium.
| | - James Wambua
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium
| | - Pietro Coletti
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium
| | - Nicolas Franco
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium
- Namur Institute for Complex Systems (naXys) and Department of Mathematics, University of Namur, Namur, Belgium
| | - Ruben Brondeel
- Department of Epidemiology and Public Health, Sciensano, Brussels, Belgium
| | - Christel Faes
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium
| | - Niel Hens
- Data Science Institute, I-BioStat, University of Hasselt, Hasselt, Belgium
- Centre for Health Economic Research and Modelling Infectious Diseases, Vaccine and infectious disease institute, University of Antwerp, Antwerp, Belgium
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Kuylen EJ, Torneri A, Willem L, Libin PJK, Abrams S, Coletti P, Franco N, Verelst F, Beutels P, Liesenborgs J, Hens N. Different forms of superspreading lead to different outcomes: Heterogeneity in infectiousness and contact behavior relevant for the case of SARS-CoV-2. PLoS Comput Biol 2022; 18:e1009980. [PMID: 35994497 PMCID: PMC9436127 DOI: 10.1371/journal.pcbi.1009980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 09/01/2022] [Accepted: 06/29/2022] [Indexed: 11/18/2022] Open
Abstract
Superspreading events play an important role in the spread of several pathogens, such as SARS-CoV-2. While the basic reproduction number of the original Wuhan SARS-CoV-2 is estimated to be about 3 for Belgium, there is substantial inter-individual variation in the number of secondary cases each infected individual causes—with most infectious individuals generating no or only a few secondary cases, while about 20% of infectious individuals is responsible for 80% of new infections. Multiple factors contribute to the occurrence of superspreading events: heterogeneity in infectiousness, individual variations in susceptibility, differences in contact behavior, and the environment in which transmission takes place. While superspreading has been included in several infectious disease transmission models, research into the effects of different forms of superspreading on the spread of pathogens remains limited. To disentangle the effects of infectiousness-related heterogeneity on the one hand and contact-related heterogeneity on the other, we implemented both forms of superspreading in an individual-based model describing the transmission and spread of SARS-CoV-2 in a synthetic Belgian population. We considered its impact on viral spread as well as on epidemic resurgence after a period of social distancing. We found that the effects of superspreading driven by heterogeneity in infectiousness are different from the effects of superspreading driven by heterogeneity in contact behavior. On the one hand, a higher level of infectiousness-related heterogeneity results in a lower risk of an outbreak persisting following the introduction of one infected individual into the population. Outbreaks that did persist led to fewer total cases and were slower, with a lower peak which occurred at a later point in time, and a lower herd immunity threshold. Finally, the risk of resurgence of an outbreak following a period of lockdown decreased. On the other hand, when contact-related heterogeneity was high, this also led to fewer cases in total during persistent outbreaks, but caused outbreaks to be more explosive in regard to other aspects (such as higher peaks which occurred earlier, and a higher herd immunity threshold). Finally, the risk of resurgence of an outbreak following a period of lockdown increased. We found that these effects were conserved when testing combinations of infectiousness-related and contact-related heterogeneity. To investigate the effect of different sources of superspreading on disease dynamics, we implemented superspreading driven by heterogeneity in infectiousness and heterogeneity in contact behavior into an individual-based model for the transmission of SARS-CoV-2 in the Belgian population. We compared the impact of both forms of superspreading in a scenario without interventions as well as in a scenario in which a period of strict social distancing (i.e. a lockdown) is followed by a period of partial release. We found that both forms of superspreading have very different effects. On the one hand, increasing the level of infectiousness-related heterogeneity led to less outbreaks being observed following the introduction of one infected individual in the population. Furthermore, final outbreak sizes decreased, and outbreaks became slower, with lower and later peaks, and a lower herd immunity threshold. Finally, the risk for resurgence of an outbreak following a period of lockdown also decreased. On the other hand, when contact-related heterogeneity was high, this also led to smaller final sizes, but caused outbreaks to be more explosive regarding other aspects (such as higher peaks that occurred earlier). The herd immunity threshold also increased, as did the risk of resurgence of outbreaks.
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Affiliation(s)
- Elise J. Kuylen
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
- * E-mail:
| | - Andrea Torneri
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
| | - Lander Willem
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
| | - Pieter J. K. Libin
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
- Artificial Intelligence Lab, Vrije Universiteit Brussel, Brussels, Belgium
- Rega Institute for Medical Research, Clinical and Epidemiological Virology, University of Leuven, Leuven, Belgium
| | - Steven Abrams
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
- Global Health Institute, University of Antwerp, Antwerp, Belgium
| | - Pietro Coletti
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
| | - Nicolas Franco
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
- Namur Institute for Complex Systems, Department of Mathematics, University of Namur, Namur, Belgium
| | - Frederik Verelst
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
| | - Philippe Beutels
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- School of Public Health and Community Medicine, The University of New South Wales, Sydney, NSW, Australia
| | - Jori Liesenborgs
- Expertise Centre for Digital Media, Hasselt University - transnational University Limburg, Hasselt, Belgium
| | - Niel Hens
- Centre for Health Economic Research and Modeling Infectious Diseases, University of Antwerp, Antwerp, Belgium
- Data Science Institute, I-BioStat, Hasselt University, Hasselt, Belgium
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Yin N, Dellicour S, Daubie V, Franco N, Wautier M, Faes C, Van Cauteren D, Nymark L, Hens N, Gilbert M, Hallin M, Vandenberg O. Leveraging of SARS-CoV-2 PCR Cycle Thresholds Values to Forecast COVID-19 Trends. Front Med (Lausanne) 2021; 8:743988. [PMID: 34790677 PMCID: PMC8591051 DOI: 10.3389/fmed.2021.743988] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/05/2021] [Indexed: 11/20/2022] Open
Abstract
Introduction: We assessed the usefulness of SARS-CoV-2 RT-PCR cycle thresholds (Ct) values trends produced by the LHUB-ULB (a consolidated microbiology laboratory located in Brussels, Belgium) for monitoring the epidemic's dynamics at local and national levels and for improving forecasting models. Methods: SARS-CoV-2 RT-PCR Ct values produced from April 1, 2020, to May 15, 2021, were compared with national COVID-19 confirmed cases notifications according to their geographical and time distribution. These Ct values were evaluated against both a phase diagram predicting the number of COVID-19 patients requiring intensive care and an age-structured model estimating COVID-19 prevalence in Belgium. Results: Over 155,811 RT-PCR performed, 12,799 were positive and 7,910 Ct values were available for analysis. The 14-day median Ct values were negatively correlated with the 14-day mean daily positive tests with a lag of 17 days. In addition, the 14-day mean daily positive tests in LHUB-ULB were strongly correlated with the 14-day mean confirmed cases in the Brussels-Capital and in Belgium with coinciding start, peak, and end of the different waves of the epidemic. Ct values decreased concurrently with the forecasted phase-shifts of the diagram. Similarly, the evolution of 14-day median Ct values was negatively correlated with daily estimated prevalence for all age-classes. Conclusion: We provide preliminary evidence that trends of Ct values can help to both follow and predict the epidemic's trajectory at local and national levels, underlining that consolidated microbiology laboratories can act as epidemic sensors as they gather data that are representative of the geographical area they serve.
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Affiliation(s)
- Nicolas Yin
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel (LHUB-ULB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Simon Dellicour
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, Bruxelles, Belgium.,Department of Microbiology, Immunology and Transplantation, Division of Clinical and Epidemiological Virology, Rega Institute, Katholieke Universiteit (KU) Leuven, Leuven, Belgium
| | - Valery Daubie
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel (LHUB-ULB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Nicolas Franco
- Department of Mathematics, Namur Centre for Complex Systems (Naxys), University of Namur, Namur, Belgium.,Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Data Science Institute, Hasselt University (UHasselt), Hasselt, Belgium
| | - Magali Wautier
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel (LHUB-ULB), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Christel Faes
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Data Science Institute, Hasselt University (UHasselt), Hasselt, Belgium
| | - Dieter Van Cauteren
- Scientific Directorate of Epidemiology and Public Health, Sciensano, Brussels, Belgium
| | - Liv Nymark
- Division of Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway.,Department of Health Management and Health Economics, University of Oslo, Oslo, Norway
| | - Niel Hens
- Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I-BioStat), Data Science Institute, Hasselt University (UHasselt), Hasselt, Belgium.,Centre for Health Economic Research and Modelling Infectious Diseases, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Marius Gilbert
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, Bruxelles, Belgium
| | - Marie Hallin
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel (LHUB-ULB), Université Libre de Bruxelles (ULB), Brussels, Belgium.,Centre for Environmental Health and Occupational Health, School of Public Health, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Olivier Vandenberg
- Centre for Environmental Health and Occupational Health, School of Public Health, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Clinical Research and Innovation Unit, Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel (LHUB-ULB), Université Libre de Bruxelles (ULB), Brussels, Belgium.,Division of Infection and Immunity, Faculty of Medical Sciences, University College London, London, United Kingdom
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8
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Vilela JCS, Franco N, Campos G, Deligne LDM, Machado TLA. Prognostic Factors of the Latarjet Procedure. Rev Bras Ortop 2021; 57:975-983. [PMID: 36540740 PMCID: PMC9757978 DOI: 10.1055/s-0041-1736513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 07/08/2021] [Indexed: 10/19/2022] Open
Abstract
Objective To investigate the factors that influence the functional results of patients submitted to the Latarjet procedure. Methods Evaluation of 26 patients submitted to surgical treatment following the Latarjet technique due to traumatic recurrent anterior dislocation of the glenohumeral joint, with glenoidal bone loss greater than 20% and/or off-track injury. The minimum follow-up time was of 12 months. The Visual Analogue Scale (VAS), The Western Ontario Shoulder Instability Index (WOSI), and the Subjective Shoulder Value (SSV) scales, as well as objective data from the participants, were evaluated. Results Most patients (84.62%) did not present recurrence of the dislocation, and 92.31% were satisfied. Regarding the functional analysis, the physical component score (PCS) and the mental component score (MCS) found were within the mean quality of life of the population. The physical symptoms, according to the WOSI, presented the best percentage (8.5%), while the worst result was observed regarding lifestyle (20%). On the VAS, pain was classified as moderate (3/10) by 15.38% of the patients (4/26). In relation to sports, patients who practice sports showed improvement in SSV parameters, which had an inverse relationship with the number of relapses. It was also observed that the shorter the time between the first dislocation and the surgery, the greater the patient's satisfaction. Conclusion Early indication of surgical treatment of anterior glenohumeral instability may provide better subjective functional results to the patient.
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Affiliation(s)
| | | | - Gustavo Campos
- Ortopedia e Traumatologia, Instituto de Previdência dos Servidores do Estado de Minas Gerais (Ipsemg), Belo Horizonte, MG, Brasil
| | | | - Thalles Leandro Abreu Machado
- Hospital Unimed BH, Belo Horizonte, MG, Brasil,Ortopedia e Traumatologia, Instituto de Previdência dos Servidores do Estado de Minas Gerais (Ipsemg), Belo Horizonte, MG, Brasil,Endereço para correspondência Thalles Leandro Abreu Machado, MD Rua Grão Pará, 658, 2° andar, Santa Efigênia, Belo Horizonte, MG, 30150-341Brasilwww.imotbh.com.br
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9
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Franco N. COVID-19 Belgium: Extended SEIR-QD model with nursing homes and long-term scenarios-based forecasts. Epidemics 2021; 37:100490. [PMID: 34482186 PMCID: PMC8390100 DOI: 10.1016/j.epidem.2021.100490] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 07/23/2021] [Accepted: 08/17/2021] [Indexed: 01/15/2023] Open
Abstract
Following the spread of the COVID-19 pandemic and pending the establishment of vaccination campaigns, several non pharmaceutical interventions such as partial and full lockdown, quarantine and measures of physical distancing have been imposed in order to reduce the spread of the disease and to lift the pressure on healthcare system. Mathematical models are important tools for estimating the impact of these interventions, for monitoring the current evolution of the epidemic at a national level and for estimating the potential long-term consequences of relaxation of measures. In this paper, we model the evolution of the COVID-19 epidemic in Belgium with a deterministic age-structured extended compartmental model. Our model takes special consideration for nursing homes which are modelled as separate entities from the general population in order to capture the specific delay and dynamics within these entities. The model integrates social contact data and is fitted on hospitalisations data (admission and discharge), on the daily number of COVID-19 deaths (with a distinction between general population and nursing home related deaths) and results from serological studies, with a sensitivity analysis based on a Bayesian approach. We present the situation as in November 2020 with the estimation of some characteristics of the COVID-19 deduced from the model. We also present several mid-term and long-term projections based on scenarios of reinforcement or relaxation of social contacts for different general sectors, with a lot of uncertainties remaining.
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Affiliation(s)
- Nicolas Franco
- Namur Institute for Complex Systems (naXys) and Department of Mathematics, University of Namur, Namur, Belgium; Interuniversity Institute of Biostatistics and statistical Bioinformatics (I-BioStat) and Data Science Institute, University of Hasselt, Hasselt, Belgium.
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10
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Mosquera-Guerra F, Trujillo F, Oliveira-da-Costa M, Marmontel M, Van Damme PA, Franco N, Córdova L, Campbell E, Alfaro-Shigueto J, Mena JL, Mangel JC, Oviedo JSU, Carvajal-Castro JD, Mantilla-Meluk H, Armenteras-Pascual D. Home range and movements of Amazon river dolphins Inia geoffrensis in the Amazon and Orinoco river basins. ENDANGER SPECIES RES 2021. [DOI: 10.3354/esr01133] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Studying the variables that describe the spatial ecology of threatened species allows us to identify and prioritize areas that are critical for species conservation. To estimate the home range and core area of the Endangered (EN) Amazon river dolphin Inia geoffrensis, 23 individuals (6♀, 17♂) were tagged during the rising water period in the Amazon and Orinoco river basins between 2017 and 2018. The satellite tracking period ranged from 24 to 336 d (mean ± SE = 107 ± 15.7 d), and river dolphin movements ranged from 7.5 to 298 km (58 ± 13.4 km). Kernel density estimates were used to determine minimum home ranges at 95% (K95 = 6.2 to 233.9 km2; mean = 59 ± 13.5 km2) and core areas at 50% (K50 = 0.6 to 54.9 km2; mean = 9 ± 2.6 km2). Protected areas accounted for 45% of the K50 estimated core area. We observed dolphin individuals crossing country borders between Colombia and Peru in the Amazon basin, and between Colombia and Venezuela in the Orinoco basin. Satellite tracking allowed us to determine the different uses of riverine habitat types: main rivers (channels and bays, 52% of recorded locations), confluences (32%), lagoons (9.6%), and tributaries (6.2%). Satellite monitoring allowed us to better understand the ecological preferences of the species and demonstrated the importance of maintaining aquatic landscape heterogeneity and spatial connectivity for effective river dolphin conservation.
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Affiliation(s)
- F Mosquera-Guerra
- Fundación Omacha, 111211 Bogotá, D.C., Colombia
- Grupo de Ecología del Paisaje y Modelación de Ecosistemas-ECOLMOD, Departamento de Biología, Universidad Nacional de Colombia, 111321 Bogotá, D.C., Colombia
| | - F Trujillo
- Fundación Omacha, 111211 Bogotá, D.C., Colombia
| | - M Oliveira-da-Costa
- World Wildlife Fund (WWF) - Brazil, Colombia, and Peru, Rue Mauverney 28, 1196 Gland, Switzerland
| | - M Marmontel
- Instituto de Desenvolvimento Sustentável Mamirauá, 69.553-225 Tefé (AM), Brazil
| | | | - N Franco
- Fundación Omacha, 111211 Bogotá, D.C., Colombia
| | - L Córdova
- Faunagua, 31001 Sacaba-Cochabamba, Bolivia
| | - E Campbell
- ProDelphinus, 15074 Lima, Peru
- School of BioSciences, University of Exeter, Penryn, Cornwall TR10 9EZ, UK
- Carrera de Biología Marina, Universidad Cientifíca del Sur, 15067 Lima, Peru
| | - J Alfaro-Shigueto
- ProDelphinus, 15074 Lima, Peru
- School of BioSciences, University of Exeter, Penryn, Cornwall TR10 9EZ, UK
- Carrera de Biología Marina, Universidad Cientifíca del Sur, 15067 Lima, Peru
| | - JL Mena
- Museo de Historia Natural Vera Alleman Haeghebaert, Universidad Ricardo Palma, 1801 Lima, Peru
| | - JC Mangel
- ProDelphinus, 15074 Lima, Peru
- School of BioSciences, University of Exeter, Penryn, Cornwall TR10 9EZ, UK
- Carrera de Biología Marina, Universidad Cientifíca del Sur, 15067 Lima, Peru
| | - JSU Oviedo
- World Wildlife Fund (WWF) - Brazil, Colombia, and Peru, Rue Mauverney 28, 1196 Gland, Switzerland
| | - JD Carvajal-Castro
- Grupo de Investigación en Evolución, Ecología y Conservación (EECO), Programa de Biología, Universidad del Quindío, 630004 Armenia, Colombia
- Department of Biological Sciences, St. John’s University, 11366 Queens, NY, USA
| | - H Mantilla-Meluk
- Grupo de Investigación en Desarrollo y Estudio del Recurso Hídrico y el Ambiente (CIDERA), Programa de Biología, Universidad del Quindío, 630004 Armenia, Colombia
- Centro de Estudios de Alta Montaña, Universidad del Quindío, 630004 Armenia, Colombia
| | - D Armenteras-Pascual
- Grupo de Ecología del Paisaje y Modelación de Ecosistemas-ECOLMOD, Departamento de Biología, Universidad Nacional de Colombia, 111321 Bogotá, D.C., Colombia
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11
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Valente F, Franco N, Rosa M, Degregori E, Lhamas C, Andrades A, Vidor S, Santos A, Kommers G, Graça D, Müller D, Contesini E. Células-tronco mesenquimais de origem adiposa na fase de proliferação do processo de cicatrização de queimaduras frias. ARQ BRAS MED VET ZOO 2020. [DOI: 10.1590/1678-4162-10855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
RESUMO A criocirurgia tem sido utilizada no tratamento de diferentes enfermidades de sistemas e órgãos. Contudo, são relatados efeitos adversos, como cicatrização lenta, cicatrizes extensas, disfunção estética e funcional. As lesões que ocorrem naturalmente pela exposição ao frio extremo, comumente, resultam em gangrena. O presente trabalho teve como objetivo avaliar a influência das células-tronco mesenquimais de origem adiposa (ADSCs) na fase de proliferação da cicatrização de feridas cutâneas. Por meio da aplicação do nitrogênio líquido pela técnica do spray aberto, realizou-se a indução de uma ferida, de aproximadamente 15mm de diâmetro, na região dorsal de cada rato. A ferida recebeu o tratamento de acordo com o grupo ao qual pertencia: 1) aplicação das ADSCs no 15º dia (grupo tratado); 2) aplicação da solução cloreto de sódio 0,9% no 15º dia (grupo sham); 3) nenhuma intervenção até o momento da eutanásia (grupo controle). O grupo tratado com as ADSCs apresentou as maiores taxas de contração média das feridas e obteve diferença estatisticamente significativa em relação ao grupo sham quanto à neovascularização. A terapia com as ADSCs proporcionou uma relevante evolução clínica das feridas, podendo ser constatada ao final do período de avaliação por cicatrizes mais estreitas e compridas.
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Affiliation(s)
| | - N. Franco
- Universidade Federal do Rio Grande do Sul, Brazil
| | - M.P. Rosa
- Universidade Federal do Rio Grande do Sul, Brazil
| | - E. Degregori
- Universidade Federal do Rio Grande do Sul, Brazil
| | | | | | | | - A. Santos
- Universidade Federal de Santa Maria, Brazil
| | | | - D.L. Graça
- Universidade Federal de Santa Maria, Brazil
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12
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Mosquera-Guerra F, Trujillo F, Parks D, Oliveira-da-Costa M, Van Damme PA, Echeverría A, Franco N, Carvajal-Castro JD, Mantilla-Meluk H, Marmontel M, Armenteras-Pascual D. Mercury in Populations of River Dolphins of the Amazon and Orinoco Basins. Ecohealth 2019; 16:743-758. [PMID: 31712931 DOI: 10.1007/s10393-019-01451-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Accepted: 10/03/2019] [Indexed: 05/26/2023]
Abstract
In the Amazon and Orinoco basins, mercury has been released from artisanal and industrial gold mining since the Colonial time, as well as a result of deforestation and burning of primary forest, that release natural deposits of methyl mercury, affecting the local aquatic vertebrate fauna. This study reports the presence of mercury in river dolphins' genera Inia and Sotalia. Mercury concentrations were analysed in muscle tissue samples collected from 46 individuals at the Arauca and Orinoco Rivers (Colombia), the Amazon River (Colombia), a tributary of the Itenez River (Bolivia) and from the Tapajos River (Brazil). Ranges of total mercury (Hg) concentration in muscle tissue of the four different taxa sampled were: I. geoffrensis humboldtiana 0.003-3.99 mg kg-1 ww (n = 21, Me = 0.4), I. g. geoffrensis 0.1-2.6 mg kg-1 ww (n = 15, Me = 0.55), I. boliviensis 0.03-0.4 mg kg-1 ww (n = 8, Me = 0.1) and S. fluviatilis 0.1-0.87 mg kg-1 ww (n = 2, Me = 0.5). The highest Hg concentration in our study was obtained at the Orinoco basin, recorded from a juvenile male of I. g. humboldtiana (3.99 mg kg-1 ww). At the Amazon basin, higher concentrations of mercury were recorded in the Tapajos River (Brazil) from an adult male of I. g. geoffrensis (2.6 mg kg-1 ww) and the Amazon River from an adult female of S. fluviatilis (0.87 mg kg-1 ww). Our data support the presence of total Hg in river dolphins distributed across the evaluated basins, evidencing the role of these cetaceans as sentinel species and bioindicators of the presence of this heavy metal in natural aquatic environments.
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Affiliation(s)
- F Mosquera-Guerra
- Fundación Omacha, Calle 84 No. 21-64, Barrio El Polo, Bogotá, DC, Colombia.
- Grupo de Ecología del Paisaje y Modelación de Ecosistemas-ECOLMOD, Departamento de Biología, Facultad de Ciencias, Universidad Nacional de Colombia, Cra 30 No. 45-03, Bogotá, DC, Colombia.
| | - F Trujillo
- Fundación Omacha, Calle 84 No. 21-64, Barrio El Polo, Bogotá, DC, Colombia
| | - D Parks
- Whitley Fund for Nature, 110 Princedale Road l, London, W11 4NH, UK
| | | | - P A Van Damme
- Faunagua, final Av. Max Fernández final s/n - Plazuela Chillijchi (Arocagua Norte) - Sacaba, Cochabamba, Bolivia
| | - A Echeverría
- Faunagua, final Av. Max Fernández final s/n - Plazuela Chillijchi (Arocagua Norte) - Sacaba, Cochabamba, Bolivia
| | - N Franco
- Fundación Omacha, Calle 84 No. 21-64, Barrio El Polo, Bogotá, DC, Colombia
| | - J D Carvajal-Castro
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Bogotá, DC, Colombia
| | - H Mantilla-Meluk
- Programa de Biología, Universidad del Quindío, Carrera 15 No. 12 Norte, Armenia, Quindío, Colombia
| | - M Marmontel
- Instituto Mamirauá de Desenvolvimento Sustentável, Estrada do Bexiga, 2.584 Bairro Fonte Boa, Cx. Postal 38, Tefé, AM, 69.553-225, Brazil
| | - D Armenteras-Pascual
- Grupo de Ecología del Paisaje y Modelación de Ecosistemas-ECOLMOD, Departamento de Biología, Facultad de Ciencias, Universidad Nacional de Colombia, Cra 30 No. 45-03, Bogotá, DC, Colombia
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13
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Martins IEB, Onofre S, Franco N, Martins LM, Montenegro A, Arana-Gordillo LA, Reis A, Loguercio AD, da Silva LM. Effectiveness of In-office Hydrogen Peroxide With Two Different Protocols: A Two-center Randomized Clinical Trial. Oper Dent 2018; 43:353-361. [DOI: 10.2341/17-128-c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objectives:
The aim of this study was to compare the bleaching efficacy and tooth sensitivity (TS) of a 38% hydrogen peroxide bleaching agent used for in-office bleaching, applied under different time protocols: a 40-minute application or two 20-minute applications.
Methods and Materials:
Forty-four patients from Brazil and Colombia, with right superior canines darker than C2, were selected for this multicenter, single-blind, randomized trial. The teeth were bleached in two sessions, with a one-week interval between them, in a split-mouth design. The bleaching agent was applied in two 20-minute (2×20) applications or one 40-minute (1×40) application in each session according to the manufacturer's instructions. The color changes were evaluated by using subjective (Vita Classical and Vita Bleachedguide) and objective (Easyshade Spectrophotometer) methods at baseline and 30 days after the second session. Tooth sensitivity was recorded up to 48 hours with a 0-10 visual analog scale. Also, the pH values during the application of bleaching were recorded. Color change in shade guide units and ΔE were analyzed by using the Student t-test (α=0.05). The absolute risk and intensity of TS were evaluated with the McNemar test, the Wilcoxon signed-rank test, and the Friedman test, respectively (α= 0.05).
Results:
Significant whitening was observed in both groups after 30 days of clinical evaluation. The use of a 40-minute application did not significantly influence the absolute risk of TS (68%, 95% confidence interval [CI] = 53-80) as well as the intensity of TS compared with the acid bleaching gel (absolute risk of 82%, 95% CI = 68-91). The pH values did not differ significantly between groups and at the different assessment periods (p=0.42).
Conclusion:
The use of a 40-minute in-office bleaching agent gel application produced the same whitening degree and TS that the two 20-minute bleaching agent applications did. The former preferably should be applied because one 40-minute application does not require gel refreshing.
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Affiliation(s)
- IEB Martins
- Izabelly EB Martins, DDS, MS, Department of Restorative Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil
| | - S Onofre
- Stefania Onofre, DDS, School of Dentistry, University of Santiago de Cali, Cali, Colombia
| | - N Franco
- Natalia Franco, DDS, School of Dentistry, University of Santiago de Cali, Cali, Colombia
| | - LM Martins
- Izabelly EB Martins, DDS, MS, Department of Restorative Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil
| | - A Montenegro
- Andres Montenegro, DDS, MS, Ponta Grossa State University, Ponta Grossa, Brazil
| | - LA Arana-Gordillo
- Luis Alfonso Arana-Gordillo, DDS, MS, PhD, Department of Restorative Dentistry, School of Dentistry, University of Santiago de Cali, Cali, Colombia
| | - A Reis
- Alessandra Reis, DDS, PhD, Restorative Dentistry, Universidade Estadual de Ponta Grossa, Ponta Grossa, Brazil
| | - AD Loguercio
- Alessandro D Loguercio, DDS, MS, PhD, Restorative Dentistry, Ponta Grossa State University, Ponta Grossa, Brazil
| | - LM da Silva
- Luciana Mendonça da Silva, DDS, PhD, Federal University of Amazonas, Manaus, Brazil
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14
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Franco N. Physical models from noncommutative causality. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201818202043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We introduced few years ago a new notion of causality for noncommutative spacetimes directly related to the Dirac operator and the concept of Lorentzian spectral triple. In this paper, we review in a non-technical way the noncommutative causal structure of many toy models as almost commutative spacetimes and the Moyal-Weyl spacetime. We show that those models present some unexpected physical interpretations as a geometrical explanation of the Zitterbewegung trembling motion of a fermion as well as some geometrical constraints on translations and energy jumps of wave packets on the Moyal spacetime.
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Affiliation(s)
- E. Alves
- Instituto Tecnológico e Nuclear, EN-10 Laboratório de Feixes de Iões, Física, 2686-953 Sacavém, Portugal
- Centro de Física Nuclear da Universidade de Lisboa Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal
| | - L. C. Alves
- Instituto Tecnológico e Nuclear, EN-10 Laboratório de Feixes de Iões, Física, 2686-953 Sacavém, Portugal
- Centro de Física Nuclear da Universidade de Lisboa Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal
| | - N. Franco
- Instituto Tecnológico e Nuclear, EN-10 Laboratório de Feixes de Iões, Física, 2686-953 Sacavém, Portugal
| | - M. R. Da Silva
- Centro de Física Nuclear da Universidade de Lisboa Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal
| | - A. Paúl
- Instituto de Ciencia de Materiales de Sevilla Avda. Américo Vespuccio 49, 41092 Seville, Spain
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16
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Mateus R, Franco N, Alves E. Retention behaviour of deuterium and helium in beryllium under single D+ and dual He+/D+ exposure. Fusion Engineering and Design 2015. [DOI: 10.1016/j.fusengdes.2015.06.127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Castellanos-Ortega A, Rothen HU, Franco N, Rayo LA, Martín-Loeches I, Ramírez P, Cuñat de la Hoz J. Training in intensive care medicine. A challenge within reach. Med Intensiva 2014; 38:305-10. [PMID: 24589154 DOI: 10.1016/j.medin.2013.12.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 12/30/2013] [Indexed: 11/30/2022]
Abstract
The medical training model is currently immersed in a process of change. The new paradigm is intended to be more effective, more integrated within the healthcare system, and strongly oriented towards the direct application of knowledge to clinical practice. Compared with the established training system based on certification of the completion of a series or rotations and stays in certain healthcare units, the new model proposes a more structured training process based on the gradual acquisition of specific competences, in which residents must play an active role in designing their own training program. Training based on competences guarantees more transparent, updated and homogeneous learning of objective quality, and which can be homologated internationally. The tutors play a key role as the main directors of the process, and institutional commitment to their work is crucial. In this context, tutors should receive time and specific formation to allow the evaluation of training as the cornerstone of the new model. New forms of objective summative and training evaluation should be introduced to guarantee that the predefined competences and skills are effectively acquired. The free movement of specialists within Europe is very desirable and implies that training quality must be high and amenable to homologation among the different countries. The Competency Based training in Intensive Care Medicine in Europe program is our main reference for achieving this goal. Scientific societies in turn must impulse and facilitate all those initiatives destined to improve healthcare quality and therefore specialist training. They have the mission of designing strategies and processes that favor training, accreditation and advisory activities with the government authorities.
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Affiliation(s)
- A Castellanos-Ortega
- Servicio de Medicina Intensiva, Hospital Universitario Marqués de Valdecilla, Santander, España.
| | - H U Rothen
- Department of Intensive Care Medicine, University Hospital of Bern, Berna, Suiza
| | - N Franco
- Servicio de Medicina Intensiva, Hospital Universitario de Móstoles, Móstoles, Madrid, España
| | - L A Rayo
- Servicio de Medicina Intensiva, Hospital Son Espases, Palma de Mallorca, España
| | - I Martín-Loeches
- Servicio de Medicina Intensiva, Hospital de Sabadell, Corporació Sanitària Universitària Parc Taulí, Sabadell, Barcelona, España
| | - P Ramírez
- Servicio de Medicina Intensiva, Hospital La Fe, Valencia, España
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Grosseto D, Carigi S, Santarelli A, Baldazzi F, Franco N, Amati S, Santoro D, Marinelli L, Marconi M, Piovaccari G. Takotsubo cardiomiopathy: incidence, clinical features and prognosis in all comers patients referred for acute coronary syndrome. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht307.p461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Dy CJ, Franco N, Ma Y, Mazumdar M, McCarthy MM, Gonzalez Della Valle A. Complications after patello-femoral versus total knee replacement in the treatment of isolated patello-femoral osteoarthritis. A meta-analysis. Knee Surg Sports Traumatol Arthrosc 2012; 20:2174-90. [PMID: 21987361 DOI: 10.1007/s00167-011-1677-8] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2011] [Accepted: 09/12/2011] [Indexed: 12/18/2022]
Abstract
PURPOSE Both patellofemoral arthroplasty (PFA) and total knee arthroplasty (TKA) are successful in treating isolated patellofemoral osteoarthritis, but the complication rates after PFA are concerning. We performed a meta-analysis to compare the incidence of complications, re-operations, and revision following PFA and TKA for patellofemoral osteoarthritis. METHODS We systematically identified publications with patients who underwent PFA or TKA for patellofemoral osteoarthritis with minimum 1.5 year follow-up. Demographics, implant (TKA, first [1G] or second-generation [2G] PFA), complications, and cause of re-operations were extracted. Random-effects meta-analysis was used to pool incidence data, which was compared between groups using logistic regression to adjust for length of follow-up. RESULTS Twenty-eight observational studies and no randomized trials were included in this meta-analysis, which limits its generalizability. There was a higher likelihood of any re-operation (odds ratio 8.06) and revision (OR 8.11) in PFA compared to TKA. Re-operation (OR 4.33) and revision (OR 4.93) were more likely in 1G-PFA than 2G-PFA. When comparing 2G-PFA to TKA, there was no significant difference in re-operation, revision, pain, or mechanical complications. CONCLUSIONS Patients who undergo PFA rather than TKA are more likely to experience complications and require re-operation or revision, but subgroup analysis suggests a relation to implant design. There is no significant difference in re-operation, revision, pain, or mechanical complications between 2G-PFA and TKA. LEVEL OF EVIDENCE Systematic review of Level III therapeutic studies, Level III.
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Affiliation(s)
- C J Dy
- Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 E 70th Street, New York, NY 10021, USA.
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Cortellini G, Testi S, Severino M, Chechi T, Iorno ML, Santucci A, Corvetta A, Piovaccari G, Santarelli A, Franco N, Canonica GW, Passalacqua G. Aspirin challenge/desensitisation before coronary stenting in subjects with history of hypersensitivity. A pragmatic approach. Eur Ann Allergy Clin Immunol 2012; 44:160-162. [PMID: 23092002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND Aspirin hypersensitivity may represent a major problem in patients with ischemic coronary disease who need a stenting procedure. In those patients, clinically unsettled reasonably quick desensitisation procedures are needed. In our study we attempted to select the most suitable procedure on the basis of characteristics and severity of ASA hypersensitivity. METHODS Thirty patients with a history of mild reactions to anti-inflammatory doses of aspirin (> 325 mg) were considered at low risk and underwent a tolerance test in 5 steps. Thirty-one patients, with a history of severe reactions to anti-platelet doses of aspirin 0 mg) underwent a slow desensitisation in 12 steps, reaching a cumulative dose of 150 mg ASA in 220 minutes. RESULTS In the first group, 29 patients tolerated the challenge. One developed urticaria, thus underwent challenge/desensitisation and achieved tolerance. In the second group, 3 patients did not tolerate the procedure and had to discontinue. CONCLUSION. Our approach to aspirin hypersensitivity in patients needing coronary stenting, based on a severity stratification, allowed to achieve an effective tolerance to aspirin in the majority of subject in a reasonable short time.
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Affiliation(s)
- G Cortellini
- Internal Medicine and Rheumatology Unit, Rimini Hospital, Rimini, Italy
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Redondo-Cubero A, Hierro A, Chauveau JM, Lorenz K, Tabares G, Franco N, Alves E, Muñoz E. Single phase a-plane MgZnO epilayers for UV optoelectronics: substitutional behaviour of Mg at large contents. CrystEngComm 2012. [DOI: 10.1039/c2ce06315h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kurinskiy P, Chakin V, Moeslang A, Rolli R, Alves E, Alves L, Franco N, Dorn C, Goraieb A. Comparative study of fusion relevant properties of Be12V and Be12Ti. Fusion Engineering and Design 2011. [DOI: 10.1016/j.fusengdes.2010.12.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vecchio S, Zanolla L, Valencia J, Colletta M, Capecchi A, Franco N, Piovaccari G, Margheri M, Di Pasquale G, Rubboli A. Coronary stenting for ST-elevation myocardial infarction vs. other indications in patients on oral anticoagulation: any difference in in-hospital management and outcome? Minerva Cardioangiol 2011; 59:499-506. [PMID: 21983310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM The aim of this paper was to compare the in-hospital management and outcome of patients on oral anticoagulation (OAC) undergoing coronary artery stenting (PCI-S) for ST-elevation myocardial infarction (STEMI) vs. other indications. METHODS One hundred and sixteen patients on OAC at the time of PCI-S who were prospectively enrolled in a multi-center, observational registry, were evaluated. Patients were segregated according to whether PCI-S was performed for STEMI (group 1) or other indications, such as non ST-elevation acute coronary syndromes, stable angina, silent ischemia, etc. (group 2), and the pharmacological and procedural management, as well as the in-hospital outcome, were compared. RESULTS No significant differences were observed in vascular access site, sheath size and type of stent implanted, nor was significantly different the use of glycoprotein IIb/IIIa inhibitors, and the use and dose of intravenous unfractionated heparin. Although not statistically different, the in-hospital occurrence of death (3.7% vs. 1.1%; OR 3.3; 95% confidence intervals [CI] 0.2-56.0), stent thrombosis (3.7% vs. 1.1%; OR 3.3; 95% CI 0.2-56.0) and major bleeding (7.4% vs. 2.2%; OR 3.4; 95% CI 0.4-25.9) was consistently about 3-fold higher in group 1. CONCLUSION The in-hospital pharmacological and procedural management of OAC patients undergoing PCI-S for STEMI vs. other indications appears not different. Although not significantly different however, the in-hospital occurrence of major bleeding, as well as of death and stent thrombosis, appears substantially higher in patients treated for STEMI, warranting therefore further larger, prospective studies.
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Affiliation(s)
- S Vecchio
- Division of Cardiology and Interventional Center, Santa Maria delle Croci Hospital, Ravenna, Italy.
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Mateus R, Carvalho P, Nunes D, Alves L, Franco N, Correia J, Alves E. Microstructural characterization of the ODS Eurofer 97 EU-batch. Fusion Engineering and Design 2011. [DOI: 10.1016/j.fusengdes.2011.01.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Magalhães S, Lorenz K, Franco N, Barradas NP, Alves E, Monteiro T, Amstatt B, Fellmann V, Daudin B. Effect of annealing on AlN/GaN quantum dot heterostructures: advanced ion beam characterization and X-ray study of low-dimensional structures. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3614] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Peixoto RS, Chaer GM, Franco N, Reis Junior FB, Mendes IC, Rosado AS. A decade of land use contributes to changes in the chemistry, biochemistry and bacterial community structures of soils in the Cerrado. Antonie Van Leeuwenhoek 2010; 98:403-13. [PMID: 20495870 DOI: 10.1007/s10482-010-9454-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Accepted: 05/05/2010] [Indexed: 11/24/2022]
Abstract
The bacterial community structures (BCSs) of Cerrado soils cultivated under conventional tillage (CT), no-tillage (NT) and under native Cerrado (NC) vegetation were evaluated using PCR/DGGE of bacterial 16S rRNA (rrs) and rpoB genes and of Pseudomonas group genes. Soil chemical analysis, microbial biomass and the enzyme activities were also evaluated and correlated with the BCS measurements. The multivariate ordinations of DGGE profiles showed differences between the BCS of the NC area and those from cultivated areas. The BCSs of the CT and NT areas also differed in all DGGE fingerprints, including changes in the profile of Pseudomonas populations, indicating that agricultural systems can also be responsible for changes within specific microbial niches, although the clearest differences were found in the rpoB profiles. The MRPP analysis demonstrated significant differences between the BCSs from different soil layers of NT areas based on all gene fingerprints and those of NC areas based on bacterial 16S rRNA and rpoB genes fingerprints. No differences were observed in the microbial fingerprints of CT samples from different depths, indicating that ploughing affected the original BCS stratification. The BCS from NC areas, based on all gene fingerprints, could be related to higher levels of soil acidity and higher amounts of MBC and of phosphatase activity. In contrast, the BCSs from cultivated areas were related to higher levels of Ca + Mg, P and K, likely as a result of a history of chemical fertilisation in these areas. The relationships between rpoB and Pseudomonas BCSs and all chemical and biochemical properties of soils were significant, according to a Mantel test (P < 0.05), indicating that the different changes in soil properties induced by soil use or management may drive the formation of the soil BCS.
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Affiliation(s)
- R S Peixoto
- LEMM-Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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Peres M, Neves AJ, Monteiro T, Magalhães S, Franco N, Lorenz K, Alves E, Damilano B, Massies J, Dussaigne A, Grandjean N. Optical and structural properties of an Eu implanted gallium nitride quantum dots/aluminium nitride superlattice. J Nanosci Nanotechnol 2010; 10:2473-2478. [PMID: 20355450 DOI: 10.1166/jnn.2010.1430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
GaN/AIN structures made of GaN quantum dots (QDs) separated by AIN spacer layers, were doped with Europium by ion implantation. Rutherford Backscattering/Channelling measurements showed that Eu is incorporated mainly on near-substitutional cation sites within the superlattice region. Only slight deterioration of the crystal quality and no intermixing of the different layers are observed after implantation and annealing. After thermal annealing, photoluminescence associated with Eu3+ ions was observed. From its behaviour under different photon energy excitation and sample temperature we concluded that the Eu-related emitting centres are located inside the GaN QDs or dispersed in the GaN and AIN buffer or spacer layers. The 624 nm PL line, associated with Eu-doped GaN QDs, shows very low thermal quenching, suggesting recombination of confined carriers through rare-earth ion excitation.
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Affiliation(s)
- M Peres
- Departamento de Física e 13N, Universidade de Aveiro, 3810-193 Aveiro, Portugal
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Kurinskiy P, Chakin V, Moeslang A, Rolli R, Goraieb A, Harsch H, Alves E, Franco N. Characterisation of titanium beryllides with different microstructure. Fusion Engineering and Design 2009. [DOI: 10.1016/j.fusengdes.2009.03.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Cruz MM, da Silva RC, Franco N, Godinho M. Ferromagnetism induced in rutile single crystals by argon and nitrogen implantation. J Phys Condens Matter 2009; 21:206002. [PMID: 21825539 DOI: 10.1088/0953-8984/21/20/206002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The magnetic properties of Ar- and N-implanted single crystalline TiO(2) rutile were studied and correlated with the induced disorder in order to clarify the influence of defects in the magnetic behaviour. Nominal fluences of 1 × 10(17) and 2 × 10(17) cm(-2) and an implantation energy of 100 keV were used. The as-implanted single crystals exhibited ferromagnetic behaviour up to 380 K. Annealing at 1073 K induced recovery of the lattice structure and the decrease of the ferromagnetic moment in the case of Ar-implanted samples, but the magnetic moment did not change significantly for the samples implanted with nitrogen. No impurities, other than the implanted species were detected and consequently the ferromagnetic behaviour is attributed to defects created during implantation, which in the case of nitrogen remained in the lattice even after partial recovery of the structure.
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Affiliation(s)
- M M Cruz
- CFMC-Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal. Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
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Marzocchi A, Manari A, Piovaccari G, Marrozzini C, Marra S, Magnavacchi P, Sangiorgio P, Marinucci L, Taglieri N, Gordini G, Binetti N, Guiducci V, Franco N, Reggiani MLB, Saia F. Randomized comparison between tirofiban and abciximab to promote complete ST-resolution in primary angioplasty: results of the facilitated angioplasty with tirofiban or abciximab (FATA) in ST-elevation myocardial infarction trial. Eur Heart J 2008; 29:2972-80. [DOI: 10.1093/eurheartj/ehn467] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Roig B, Virgos C, Franco N, Martorell L, Valero J, Costas J, Carracedo A, Labad A, Vilella E. The discoidin domain receptor 1 as a novel susceptibility gene for schizophrenia. Mol Psychiatry 2007; 12:833-41. [PMID: 17440435 DOI: 10.1038/sj.mp.4001995] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Evidence suggests that myelin alterations could predispose to schizophrenia. Reduced expression of several myelin genes has been observed in schizophrenia patients. Recently, we identified the discoidin domain receptor 1 (DDR1; located at human chromosome 6p21.3) as a myelin gene in the mouse model and in a human oligodendroglial cell line. In the present study we screened for single nucleotide polymorphisms (SNPs) in the DNA from 100 schizophrenia patients. We identified a novel mutation within exon 10 that produces the amino-acid substitution N502S in the a-d isoforms, and M475V in the e isoform. However the frequency of the mutation (2%) was similar in schizophrenia patients and in control subjects. In a case-control assessment with 389 schizophrenic patients and 615 controls, we identified one SNP (SNP9, rs1049623) associated with schizophrenia (odds ratio=1.44, 95% confidence interval: 1.15-1.79, adjusted P=0.0016). This association was confirmed in haplotype analysis; the SNPs 9-10-11 (rs1049623, rs2267641 and rs2239518) haplotype remaining significant even after adjustment for multiple testing (adjusted P=0.0136). Of note was a strong gender dependence in the association, that is, statistical significance restricted to men (adjusted P-value=0.0002). Regression analysis of DDR1 mRNA expression in peripheral blood lymphocytes from schizophrenia patients showed that the presence of the G allele significantly decreased the relative number of mRNA copies in a dose-dependent manner (P=0.003). These data suggest that the risk haplotype tags a cis-acting variant involved in the transcription regulation system of the gene. In conclusion, we propose the DDR1 as a new susceptibility gene for schizophrenia.
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Affiliation(s)
- B Roig
- Ctra. de l'Institut Pere Mata s/n, University Psychiatric Hospital, Pere Mata Institute, Reus, Tarragona, Spain
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Lorenz K, Franco N, Alves E, Watson IM, Martin RW, O'Donnell KP. Anomalous ion channeling in AlInN/GaN bilayers: determination of the strain state. Phys Rev Lett 2006; 97:085501. [PMID: 17026313 DOI: 10.1103/physrevlett.97.085501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Indexed: 05/12/2023]
Abstract
Monte Carlo simulations of anomalous ion channeling in near-lattice-matched AlInN/GaN bilayers allow an accurate determination of the strain state of AlInN by Rutherford backscattering or channeling. Although these strain estimates agree well with x-ray diffraction (XRD) results, XRD composition estimates are shown to have limited accuracy, due to a possible deviation from Vegard's law, which we quantify for this alloy. As the InN fraction increases from 13% to 19%, the strain in AlInN films changes from tensile to compressive with lattice matching predicted to occur at [InN] = 17.1%.
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Affiliation(s)
- K Lorenz
- Instituto Tecnológico e Nuclear, Estrada Nacional 10, 2686-953 Sacavém, Portugal.
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Alves E, Alves L, Franco N, da Silva M, Paúl A, Hegeman J, Druyts F. Characterization and stability studies of titanium beryllides. Fusion Engineering and Design 2005. [DOI: 10.1016/j.fusengdes.2005.06.145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Izquierdo M, Dávila ME, Avila J, Ascolani H, Teodorescu CM, Martin MG, Franco N, Chrost J, Arranz A, Asensio MC. Epitaxy and magnetic properties of surfactant-mediated growth of bcc cobalt. Phys Rev Lett 2005; 94:187601. [PMID: 15904410 DOI: 10.1103/physrevlett.94.187601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Indexed: 05/02/2023]
Abstract
High resolution core level photoemission spectroscopy, photoelectron diffraction, and x-ray magnetic circular dicroism (XMCD) have been used to characterize the structural and magnetic properties of bcc-cobalt films grown on GaAs(110) substrates by using Sb as a surfactant. We have unambiguously disentangled the surfactant role played by the Sb which improves the crystallinity and reduces the lattice distortion of the metallic films as well as changes the interdiffusion process at the interface compared to the Co/GaAs(110) system. As a consequence of these combined effects, an improvement on the magnetic response of the grown Co thin films has been observed by XMCD measurements.
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Affiliation(s)
- M Izquierdo
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette CEDEX, France
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Correia M, Pereira S, Frandon J, Renucci M, Alves E, Sequeira A, Franco N. Analysis of Strain Depth Variations in an In0.19Ga0.81N Layer by Raman Spectroscopy. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssc.200390114] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Picard SF, Franco N, Sergent C, Chauffert B, Lizard-Nacol S. Analysis of microsatellite instability in acquired drug-resistance human tumor cell lines. Oncol Rep 2002. [DOI: 10.3892/or.9.5.971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Abstract
[reaction--see text] The chemistry of singlet oxygen with all three isomers of tris(methoxyphenyl)phosphine has been studied. For the severely hindered ortho isomer, intramolecular rearrangement to form phenyl diphenyl phosphinate is preferred to formation of phosphine oxide at low concentration in aprotic solvents. In protic solvents, no intramolecular reactivity is observed. A detailed kinetic analyses has been undertaken. There is no physical quenching, regardless of solvent. Mechanistic implications of these findings are discussed.
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Affiliation(s)
- R Gao
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, USA
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Franco N, Picard SF, Mege F, Arnould L, Lizard-Nacol S. Absence of genetic abnormalities in fibroadenomas of the breast determined at p53 gene mutations and microsatellite alterations. Cancer Res 2001; 61:7955-8. [PMID: 11691818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Genesis of breast cancer is a multistage process involving accumulation of genetic alterations, but little is known about the implication of genetic alterations in benign breast disease (BBD) lesions. Among benign lesions of the breast, one of the most common is fibroadenoma. The relationship between fibroadenoma and breast cancer is not clear. Some epidemiological studies show an association with breast cancer risk, whereas recent reports show no increased risk. In a previous study, we analyzed genetic alterations in a group of BBD lesions composed namely of fibroadenomas unaffected by breast cancer, and we found no evident implication of several loci by Southern blot method. However, genetic alterations, including p53 gene mutations, loss of heterozygosity, microsatellite instability, and cytogenetic chromosomal aberrations, have been reported recently to occur in fibroadenomas. Thus, we reexamined our BBD population for p53 gene mutations and for microsatellite alterations with 13 markers using a PCR-based method. Our results show that no molecular alterations were detected in these BBD lesions composed namely of fibroadenomas unaffected by breast cancer. Neither p53 gene mutations, determined at exons 5-9, nor microsatellite alterations tested with a very sensitive method were found in these lesions. Therefore, molecular results obtained in our study support recent epidemiological data showing that fibroadenoma does not constitute a significant increase in the relative risk of later contracting breast cancer.
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Affiliation(s)
- N Franco
- Laboratory of Molecular Genetic, Centre Georges François Leclerc, INSERM U517, Dijon 21034, France
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Heske C, Groh U, Fuchs O, Umbach E, Franco N, Bostedt C, Terminello L, Perera R, Hallmeier K, Preobrajenski A, Szargan R, Zweigart S, Riedl W, Karg F. X-Ray Emission Spectroscopy of Cu(In,Ga)(S,Se)2-Based Thin Film Solar Cells: Electronic Structure, Surface Oxidation, and Buried Interfaces. ACTA ACUST UNITED AC 2001. [DOI: 10.1002/1521-396x(200109)187:1<13::aid-pssa13>3.0.co;2-d] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Dalle F, Franco N, Lopez J, Vagner O, Caillot D, Chavanet P, Cuisenier B, Aho S, Lizard S, Bonnin A. Comparative genotyping of Candida albicans bloodstream and nonbloodstream isolates at a polymorphic microsatellite locus. J Clin Microbiol 2000; 38:4554-9. [PMID: 11101595 PMCID: PMC87636 DOI: 10.1128/jcm.38.12.4554-4559.2000] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Molecular typing studies have shown that the predominant form of reproduction of Candida albicans is clonal and that, in a majority of situations, persistent or recurrent infections are due to a unique strain. Characterization of distinct subpopulations and correlation with clinical features may thus be important to understanding the pathogenesis of candidiasis. In a clonal model, a unique polymorphic marker may identify populations with different biological properties. We therefore compared 48 bloodstream isolates and 48 nonbloodstream matched strains of C. albicans at the elongation factor 3-encoding gene (CEF3) polymorphic microsatellite locus of C. albicans. Sizing of the alleles was performed by automated capillary electrophoresis. A new, 137-bp allele was characterized, and seven nondescribed combinations were observed, resulting in 15 and 11 distinct CEF3 profiles in bloodstream and control strains, respectively. Genotypes 126-135, 130-136, and 131-131 accounted for 60.4% of both bloodstream and control strains. Four bloodstream isolates but no control strains displayed the 135-135 combination. None of the other genotypes was present at an increased frequency in bloodstream isolates. Bloodstream and nonbloodstream strains of C. albicans thus have a heterogeneous structure at the CEF3 locus, with three major and multiple minor allelic combinations.
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Affiliation(s)
- F Dalle
- Laboratoire de Parasitologie et Mycologie, and Laboratoire de Génétique Moléculaire, Centre George François Leclerc, Dijon, France
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Arnal M, Franco N, Fargeot P, Riedinger JM, Brunet-Lecomte P, Lizard-Nacol S. Enhancement of mdr1 gene expression in normal tissue adjacent to advanced breast cancer. Breast Cancer Res Treat 2000; 61:13-20. [PMID: 10930086 DOI: 10.1023/a:1006449931921] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In the present study, mdr1 gene expression was investigated by a sensitive reverse transcriptase-PCR assay in advanced breast cancer and in corresponding adjacent normal tissues obtained before and after treatment with primary chemotherapy. Comparatively to normal tissues, a significant induction of mdr1 expression was observed in untreated tumors (p = 0.0222). Similarly, a significant induction of mdr1 expression was revealed when treated samples were compared to untreated counterparts (p = 0.0222), but no differences were detected between tumor and normal samples (p = 0.3199). Noteworthy, a significant induction of mdr1 gene expression occurred in treated normal samples comparatively to untreated ones (p = 0.0037), and this induction was even more important in normal than in tumoral tissue (p = 0.0627). However, neither the basal expression nor the induction of mdr1 were correlated with subsequent response to chemotherapy or with survival. Thus, in agreement with previous reports, our data show that chemotherapy induce mdr1 gene expression in breast cancer cells, but they also indicate that a similar phenomenon occurs in adjacent normal tissues. Therefore, our results strongly suggest that mdr1 gene overexpression is not a characteristic of breast malignant cells, but rather constitutes a general phenomenon occurring both in normal and tumor cells which could explain at least in part the absence of relationship between mdr1 expression and the clinical outcome of breast cancer patients.
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Affiliation(s)
- M Arnal
- Laboratory of Molecular Genetic, Inserm U-517, Centre Georges François Leclerc, Dijon, France
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Abstract
OBJECTIVE To conduct a controlled group outcome investigation of the efficacy of cognitive-behavioral treatment for school phobia. METHOD Fifty-six children with school phobia were randomly assigned to 12 weeks of cognitive-behavioral therapy or an attention-placebo control condition. Pre- and posttreatment school attendance, self-reported anxiety and depression, and diagnostic status were compared. RESULTS Both the experimental and control treatments were equally effective at returning children to school. Both treatments also were effective in reducing children's anxiety and depressive symptoms. Follow-up revealed no differences between groups when the children reentered school the next school year. CONCLUSIONS Overall, results suggest that psychosocial treatments are effective at returning school-phobic children to school and that the highly structured cognitive-behavioral approach may not be superior to more traditional educational and supportive treatment methods.
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Affiliation(s)
- C G Last
- Anxiety Treatment Center at the Center for Psychological Studies, Nova Southeastern University, Coral Springs, FL, USA
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Napoli E, Franco N. [Thromboxane A2 production in the pathogenesis of diabetic complications]. MINERVA ENDOCRINOL 1998; 23:1-5. [PMID: 9691631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIMS Thromboxane B2, a stable metabolite of thromboxane A2, was studied in type 2 diabetic patients to evaluate the role played by prostaglandins in the onset of vascular complications. METHODS The study was carried out in 30 subjects, 20 of whom were diabetics and 10 controls. Thromboxane B2 was assayed using the "Biotrak Thromboxane B2" kit. RESULTS In the first group of control subjects, the mean value of TXB2 was 6.39 +/- 0.89 pg/ml; in the second group, including diabetic patients without vascular complications, TXB2 levels were 8.89 +/- 1.51; in the third, consisting of diabetic patients with microangiopathy, the mean level was 46.28 +/- 6.82; in the fourth, including patients with micro- and macroangiopathy, the mean level was 98.78 +/- 17.15; the fifth group, with a mean value of 41.00 +/- 9.86, included diabetic patients with cerebral vasculopathy. Thromboxane B2 was correlated with glycemia but the results were not statistically significant (r = 0.28; p < 0.05). The correlation with the years since onset of diabetes was positive and statistically significant (r = 0.49; p < 0.05). CONCLUSIONS In conclusion, the authors emphasise that TXB2 is present in the circulation in diabetes in steadily increasing quantities over time since the onset of diabetes, leading to chronic vasoconstriction which in turn leads to a deterioration of vascular lesions in the districts where hypoglycemia has already caused the activation of neurotransmitter hormones with consequent slowing down of the blood flow and progressive tissue hypoxia.
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Affiliation(s)
- E Napoli
- Istituto di Clinica Medica I, Università degli Studi, Catania
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Abstract
OBJECTIVE To prospectively examine psychosocial functioning in young adulthood for children and adolescents with anxiety disorders. METHOD This 8-year prospective study compared psychosocial functioning in young adults (mean age 22 years) who had histories of early-onset anxiety disorders, comorbid anxiety and depressive disorders, or no history of psychiatric illness (NPI). Follow-up interviews assessed subjects' residential, educational, occupational, and marital status; utilization of mental health services; and psychological status RESULTS Anxious subjects without histories of depression were less likely than NPI controls to be living independently. Anxious-depressed subjects were less likely than controls to be working or in school; more likely than purely anxious subjects to utilize mental health services; and more likely than both anxious and control subjects to report psychological problems, most frequently depression. CONCLUSIONS Overall, results suggest that children with anxiety disorders are relatively well adjusted in young adulthood. However, a history of comorbid depression is prognostic of a more negative outcome.
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Affiliation(s)
- C G Last
- Anxiety Treatment Center, Nova Southwestern University, Coral Springs, FL, USA
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Tartagni F, Fallani F, Corbelli C, Balletta A, Franchi R, Lombardi A, Bellanova B, Sardella A, Franco N, Monetti N. Detecting hibernated myocardium with SPECT and thallium-glucose-insulin infusion. J Nucl Med 1995; 36:1377-83. [PMID: 7629581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
UNLABELLED Because thallium kinetics, like potassium kinetics, may be affected by serum insulin levels, we performed two pilot studies to identify severely ischemic myocardium using different protocols based on the infusion of a thallium, insulin, potassium and glucose solution. Results were compared with those obtained with two currently used protocols based on rest injection or reinjection of 201Tl. METHODS In the first study (Protocol 1) of 15 men with a previous large myocardial infarction, perfusion was evaluated by SPECT in 20 segments after a 30-min infusion of 201Tl (111 MBq), insulin (5 U) and potassium (10 mEq) in 10% glucose solution (250 ml). Imaging was repeated 30 min later and the results were compared with those obtained from stress and 3-hr reinjection images. In the second study (Protocol 2), 15 patients were evaluated randomly at rest and 3 hr later (rest-redistribution). On a separate day, the patients were then re-evaluated after infusion of 201Tl (111 MBq), potassium (10 mEq) and insulin (5 U) in 5% glucose (250 ml); images were obtained 90 and 180 min postinjection. RESULTS In Protocol 1, radiotracer activity in segments with no uptake during stress was detected in 35% with the reinjection technique and 58% with the insulin solution protocol. In Protocol 2, 31% of segments revealed thallium activity after insulin infusion but not at rest or rest-redistribution. Serum measurements showed high insulin levels (444 +/- 138 in Protocol 1, 125 +/- 33 mU/ml in Protocol 2), although glucose levels were not significantly altered (149 +/- 32 versus 71 +/- 20 mg/dl, respectively). Potassemia was not affected and the patients tolerated the tests satisfactorily. CONCLUSION These results confirm that continuous infusion of 201Tl with a low dose of insulin in a glucose/potassium chloride solution is safe and may enhance cellular uptake of the radiotracer in severe ischemic regions, thereby improving viable myocardium detection.
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Affiliation(s)
- F Tartagni
- Institute for Cardiovascular Diseases, University of Bologna, Italy
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Baroncini A, Franco N, Forabosco A. A new family with chorioretinal dystrophy, spinocerebellar ataxia and hypogonadotropic hypogonadism (Boucher-Neuhäuser syndrome). Clin Genet 1991; 39:274-7. [PMID: 1906382 DOI: 10.1111/j.1399-0004.1991.tb03025.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A family is described in which two brothers have spinocerebellar ataxia, hypogonadotropic hypogonadism and chorioretinal dystrophy. This report provides further evidence to support the previous suggestion that this triad of manifestations represents a specific single-gene disorder, designated Boucher-Neuhäuser syndrome. Analysis of affected individuals shows that neurological signs usually develop during adolescence or young adulthood (range: early childhood-fourth decade) and are slowly progressive or non-progressive, whereas ophthalmologic manifestations have an age of onset which varies from the first to the sixth decade of life and a pronounced variability in progression.
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Affiliation(s)
- A Baroncini
- Maternal and Child Health Department, U.S.L. 23, Imola, Italy
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Faerman I, Faccio E, Calb I, Razumny J, Franco N, Dominguez A, Podestá HA. Autonomic neuropathy in the skin: a histological study of the sympathetic nerve fibres in diabetic anhidrosis. Diabetologia 1982; 22:96-9. [PMID: 7060854 DOI: 10.1007/bf00254836] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In diabetics with the anhidrotic syndrome, autonomic nerve fibres were studied in skin biopsies using argentic techniques and light microscopy. The Minor test was used to differentiate normal from anhidrotic skin areas. In the anhidrotic areas, histology of the nerve fibres showed beading, spindle-shaped thickening and fragmentation adjacent to the sweat glands. These changes were similar to those observed in two patients who had previously undergone lumbar sympathectomy. No abnormalities of the sympathetic nerve endings could be found in biopsies taken from normal areas of the forearm of the same patients. We conclude that the diabetic anhidrotic syndrome, a form of diabetic autonomic neuropathy, is due to a lesion of the sympathetic nerve supply to the skin. It is suggested that the Minor test or a skin biopsy should be performed in diabetic patients who are being considered for surgical sympathectomy.
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Franco N, Conti G. [Clinical considerations on a case of Fahr's disease]. Riv Neurobiol 1977; 23:255-61. [PMID: 617895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Franco N, Guedenet JC, Grignon G. [Ultrastructural study of the follicular cells of the adenohypophysis of the chicken]. Bull Assoc Anat (Nancy) 1976; 60:515-26. [PMID: 1028447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
As in other species, a network of follicular cells linked together by functional complexes can be observed by electron microscopy in the adenohypophysis of the chick. No secretory granules are seen in the follicular cells. They are connected with each other by thin and long processes inserted between the glandular cells and the perivascular spaces. They limit, by their follicular pole, submicroscopic cavities of irregular size and shape. They are empty or occupied by a material of variable density. These cells exist very precociously in the embryo but their characteristic organisation to form a network is observed only on the 16th day of incubation. Our experimental study made it possible to evoke, as a number of other authors, that they play a role in the functions of support, exchange, transport of secretory material or phagocytosis.
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Fellmann D, Franco N, Bloch B, Hatier R. [Immunocytochemical study of corticotropic cells in the adenohypophysis of the chick embryo]. Bull Assoc Anat (Nancy) 1975; 59:631-7. [PMID: 177137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Corticotrophin cells of the pituitary have been studied immunocytologically with I.S. anti-A.C.T.H. (1-24) and I.S. anti-A.C.T.H. (17-39). These sera show differentiated cells as soon as the 8th of incubation. These cells remain located within the anterior part of the adenohypophysis. They are not "revelated" by I.S. anti-beta-M.S.H. and I.S. anti-beta-LPH.
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