23 research outputs found

    A propos de la réactivation du virus de l hépatite B

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    CHATENAY M.-PARIS 11-BU Pharma. (920192101) / SudocSudocFranceF

    Place de la troponine en mĂ©decine gĂ©nĂ©rale ambulatoire (Ă©tat des lieux et intĂ©rĂȘt)

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    LYON1-BU Santé (693882101) / SudocSudocFranceF

    Incertitudes sur les dĂ©bits issus des courbes de tarage : Estimation de l’incertitude d’un dĂ©bit sur le rĂ©seau hydromĂ©trique d’EDF-DTG

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    Water resources management is a central concern for EDF, both in the fields of safety, regulation and energy production. To meet these needs, EDF manage an hydrometric network composed by more than 350 stations. Thus, ensuring the streamflow data quality has become a priority for EDF-DTG. EDF-DTG, like other data producers, faces some gauging stations whose hydraulic control sections are moderately to poorly stable. This is the reason why, a model of streamflow uncertainty, based on the use of historical gauging, was developed. Compared to classical approaches used to estimate streamflow uncertainty, this model is more suitable for our hydrometric pratices.La gestion de l’eau est au centre des prĂ©occupations d’EDF, aussi bien dans les domaines de la sĂ»retĂ©, la rĂ©glementation, la production d’énergie, que du multi-usage de l’eau. Afin de rĂ©pondre Ă  ces besoins, EDF-DTG gĂšre un rĂ©seau de mesure de dĂ©bit de plus de 350 stations. Garantir la qualitĂ© des donnĂ©es de dĂ©bit, tout en estimant leur incertitude est devenu un objectif majeur pour EDF-DTG. Comme tout gestionnaire de rĂ©seau, EDF-DTG est confrontĂ© Ă  des stations de jaugeage dont les sections de contrĂŽle sont moyennement Ă  peu stables dans le temps. Ceci l’a amenĂ© Ă  dĂ©velopper un modĂšle d’estimation des incertitudes des dĂ©bits, basĂ© sur la valorisation de l’historique des jaugeages, tout en prenant en compte la vie de la station. Par rapport aux approches d’estimation de l’incertitude classiquement utilisĂ©es, ce modĂšle est plus adaptĂ© Ă  nos pratiques de l’hydromĂ©trie et traduit de maniĂšre empirique le ressenti des hydromĂštres, confrontĂ©s Ă  la rĂ©alitĂ© de la mesure.Mathevet Thibault, CarrĂ© CĂ©cile, Garçon RĂ©my, Perret Christian. Incertitudes sur les dĂ©bits issus des courbes de tarage : Estimation de l’incertitude d’un dĂ©bit sur le rĂ©seau hydromĂ©trique d’EDF-DTG. In: Mesures Hydrologiques et Incertitudes en HydromĂ©trie et QualitĂ© de l’eau. Paris, 1 et 2 avril 2008. 2008

    Hydrométrie et hydrologie historique du bassin de la Durance

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    Historical hydrometry and hydrology of the Durance river watershed. This paper presents different studies on the Durance river watershed, situated in the south part of the Alps. Our studies explore a large collection of historical archives in hydrology and hydrometry, found by a historian. This watershed is characterised by an incredible density of hydrological stations, with more than 150 stations and 4500 years of hydrological records, since the beginning of the 20th century. As an example, the archives of 10 stations starting between 1900 and 1917 were very detailed, with all the gaugings, rating curves, and streamflows records. Archives also reveal the great scientific and technical involvement at that period to understand, develop streamflow measurements and estimate available water resources. Then, we present an estimation of streamflow uncertainty of historical series due to the height measurement strategy. Results show that long streamflow series are not homogeneous in time and that old streamflows series could be significantly biased during snowmelt. Finally, this paper shows the great interest of historical time-series to better characterise hydrometeorological variability.Cette communication prĂ©sente diffĂ©rents travaux que nous avons menĂ©s sur le bassin de la Durance. Ces travaux explorent l’incroyable patrimoine de donnĂ©es historiques en hydrologie et en hydromĂ©trie de la Durance, oĂč il a existĂ© plus de 150 stations hydromĂ©triques, avec un total de 4500 annĂ©es de dĂ©bits. Des sĂ©ries de dĂ©bits commençant au dĂ©but du 20Ăšme siĂšcle ont pu ĂȘtre retrouvĂ©es, ainsi que de trĂšs nombreuses informations sur les stations hydromĂ©triques, les techniques de jaugeages, les courbes de tarage, etc. Ce patrimoine historique met en Ă©vidence le trĂšs fort investissement des personnels pour dĂ©velopper les techniques de mesure et faire progresser la connaissance des ressources en eau des bassins. Ensuite, nous prĂ©sentons des travaux que nous avons menĂ©s pour caractĂ©riser une partie de l’incertitude des donnĂ©es anciennes, liĂ©e au mode d’échantillonnage des hauteurs. Ces travaux montrent que les longues sĂ©ries ne sont gĂ©nĂ©ralement pas homogĂšnes d’un point de vue de la mesure et que les sĂ©ries anciennes peuvent ĂȘtre significativement biaisĂ©es pendant la pĂ©riode de fonte. Enfin, nous prĂ©sentons des travaux sur la caractĂ©risation de la variabilitĂ© hydrologique du bassin de la Durance au cours des 100 derniĂšres annĂ©es. Ces travaux confirment l’intĂ©rĂȘt de ces sĂ©ries sĂ©culaires pour mieux connaĂźtre le fonctionnement des bassins versants.Kuentz Anna, Mathevet Thibault, Coeur Denis, Perret Christian, Gailhard Joel, GuĂ©rin Laura, Gash Yasin, AndrĂ©assian Vazken. HydromĂ©trie et hydrologie historique du bassin de la Durance. In: 35es journĂ©es de l’hydraulique de la SociĂ©tĂ© Hydrotechnique de France. HydromĂ©trie 2013. Paris, 15-16 mai 2013. 2013

    ModĂšles de prĂ©vision et prise de dĂ©cision pour le soutien d’étiage de la Loire

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    Le bassin de la Loire est caractĂ©risĂ© par une forte variabilitĂ© hydrologique naturelle, une grande richesse hydro-Ă©cologique et de nombreux usages anthropiques : irrigation, alimentation en eau potable, sports et festivitĂ©s nautiques, hydroĂ©lectricitĂ© et refroidissement de quatre centrales nuclĂ©aires. Deux ouvrages de retenue, gĂ©rĂ©s par l’Établissement Public Loire, assurent le soutien d’étiage : Villerest, sur la Loire, et Naussac, sur l’Allier. Leur gestion doit garantir des dĂ©bits objectifs sur l’Allier et la Loire de maniĂšre Ă  concilier ces usages parfois contradictoires, mais en cas de situation critique, telle que l’étiage trĂšs sĂ©vĂšre de l’étĂ© 2003, cette gestion peut ĂȘtre adaptĂ©e en associant les usagers sous la prĂ©sidence du PrĂ©fet coordonnateur de bassin au sein d’un comitĂ© de gestion. Suite Ă  cet Ă©vĂ©nement, de nouvelles rĂšgles de gestion ont Ă©tĂ© pratiquĂ©es pour mieux utiliser les ressources stockĂ©es dans les retenues, autour de valeurs de dĂ©bits objectifs modulables. Afin d’amĂ©liorer la gestion de l’étiage, la DIREN Centre, EDF et l’EP Loire ont mis en place une modĂ©lisation hydrologique de prĂ©vision des dĂ©bits d’étiage de la Loire Ă  Gien. Ce modĂšle, opĂ©rationnel depuis le printemps 2009 à la DIREN Centre, permet dĂ©jĂ  d’évaluer l’efficacitĂ© des consignes de gestion dynamique et ouvre des perspectives intĂ©ressantes en termes d’aide Ă  la prise de dĂ©cision pour le soutien d’étiage. AprĂšs avoir prĂ©sentĂ© succinctement le contexte des Ă©tiages de la Loire, dans cet article, nous prĂ©sentons les performances des modĂšles de simulation et de prĂ©vision des Ă©tiages, de la simulation des dĂ©bits Ă  la prĂ©vision probabiliste des volumes de dĂ©ficits. Ensuite, nous prĂ©sentons l’exemple de l’étiage de 2003 et la maniĂšre dont ces prĂ©visions auraient permis d’apprĂ©hender et d’anticiper la situation de 2003, aussi bien avec des prĂ©visions probabilistes de dĂ©bits que de dĂ©ficits

    Long-term outcomes after acute myocardial infarction in patients with familial hypercholesterolemia: The French registry of Acute ST-elevation and non-ST-elevation Myocardial Infarction program

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    International audienceBackground: Patients with familial hypercholesterolemia (FH) are prone to develop acute myocardial infarction (AMI) at a younger age.Objectives: The aim of the present study was to assess 5-year outcomes after AMI according to the presence of FH in a large multicenter cohort of patients.Methods: The French registry of Acute ST-elevation and non-ST-elevation Myocardial Infarction consists of nationwide surveys recruiting patients over a 1- to 2-month period every 5 years. Patients recruited in 2005 and 2010 were followed up to 5 years.Results: Of 5147 patients discharged alive and in whom FH status could be assessed, 2.8% had probable/definite FH, using an adapted Dutch Lipid Clinic score. They were 12 years younger, on average, than non-FH patients. Before adjustment, their 5-year survival and event-free survival did not differ from non-FH patients. After adjustment, however, both mortality (hazard ratio [HR] 1.82, 95% confidence interval [CI] 1.15-2.89; P = .011) and the combined endpoint of death, AMI, or stroke (HR 2.22, 95% CI: 1.51-3.26; P < .001) were higher in FH patients. The higher risk in FH patients was also present in patients receiving high-intensity lipid-lowering therapy at discharge: adjusted HR for mortality 2.29, 95% CI: 1.18 to 4.47, P = .015; HR for cardiovascular events 2.57, 95% CI: 1.48 to 4.48, P = .001. Concordant results were observed in propensity score-marched cohorts.Conclusions: The risk of long-term mortality and cardiovascular events is twice as high in FH than in non-FH patients, when adjusted on baseline characteristics, even for those receiving high-intensity lipid-lowering therapy. Additional therapeutic measures are needed in these patients

    Non-culprit artery myocardial infarction and complex coronary lesions in anterior ST-elevated myocardial infarction patients.

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    International audienceAims: Periprocedural myocardial infarctions have been reported in the setting of planned percutaneous coronary intervention (PCI). We assessed the prevalence of nonculprit artery acute myocardial infarction (NCAMI) and its relationship with coronary artery characteristics, final infarct size, and 1-year adverse clinical outcomes in a population of anterior ST-elevated myocardial infarction (STEMI) patients.Methods and results: Late gadolinium-enhanced cardiac magnetic resonance (LGE-CMR) studies were performed within 7 days of admission in 129 anterior STEMI patients from the CIRCUS trial treated by primary PCI. Infarct in the noninfarct artery territory (circumflex, right coronary) was assessed on LGE-CMR and T2-weighted images. Eleven (8.5%) patients exhibited NCAMI. The only independent characteristic significantly associated with NCAMI was the presence of multiple complex coronary lesions (odds ratio = 12.9, 95% confidence interval [3.1-53.4]; p < 0.001). There was a significantly increased infarct size in NCAMI patients compared to patients without NCAMI (45.8 ± 20.4% of the left ventricle [LV] vs. 31.0 ± 15.1% of LV, respectively; p = 0.02), with lower LV ejection fraction (46 ± 10% vs. 34 ± 8%, respectively; p < 0.001).Conclusion: NCAMIs are present in 8.5% of anterior STEMI patients and are significantly associated with multiple complex coronary lesions without significant relationship to any revascularization procedural technique. NCAMI was associated with a greater infarct size and reduced LVEF but not worse clinical outcomes at 1 year
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