54 research outputs found
Anemia and iron deficiency in COPD patients: prevalence and the effects of correction of the anemia with erythropoiesis stimulating agents and intravenous iron
Lâaltitude : un modĂšle unique de comprĂ©hension des effets de lâhypoxie
International audienceNo abstract availabl
Ătude comparative des propriĂ©tĂ©s hydrogĂ©nantes de ZrO
Dans ce travail, nous avons comparĂ© l'Ă©volution de l'activitĂ© et de la sĂ©lectivitĂ© de ZrO2 et de ZnO en fonction du temps pour la rĂ©duction du benzoate de mĂ©thyle en benzaldĂ©hyde et ce, pour diverses conditions d'activation des catalyseurs. Sur ZnO, la conversion est toujours maximale en dĂ©but de rĂ©action. Par contre, sur ZrO2 activĂ© sous hydrogĂšne Ă 300 ou 350°C, la conversion augmente en cours de rĂ©action pour atteindre, aprĂšs 9 heures, une valeur proche de celle observĂ©e pour une zircone prĂ©traitĂ©e Ă 400°C.Ces rĂ©sultats peuvent ĂȘtre interprĂ©tĂ©s en considĂ©rant que les sites actifs sont des sites rĂ©duits se formant facilement Ă la surface de ZnO alors que leur crĂ©ation nĂ©cessiterait sur ZrO2 des conditions plus sĂ©vĂšres. La rĂ©ductibilitĂ© des ions Zr4+ prĂ©sents Ă la surface de la zircone est discutĂ©e Ă partir des rĂ©sultats infrarouges observĂ©s par adsorption du monoxyde de carbone
Transformation du benzaldéhyde sur MgO, ZrO
Sous hĂ©lium, le benzaldĂ©hyde se transforme sĂ©lectivement en alcool benzylique par une rĂ©action de type Cannizzaro. Les activitĂ©s observĂ©es en dĂ©but de rĂ©action dĂ©pendent uniquement du nombre dâhydroxyles basiques forts initiaux et conduisent au classement suivant : a(MgO) >> a(ZrO2) > a(ZnO) â 0En prĂ©sence de H2, la transformation de lâaldĂ©hyde benzylique en alcool benzylique est une rĂ©action catalytique, elle peut ĂȘtre dĂ©crite par deux schĂ©mas rĂ©actionnels en compĂ©tition. Le premier nĂ©cessite une dissociation rĂ©versible du dihydrogĂšne et semble liĂ© Ă la rĂ©ductibilitĂ© de lâoxyde, le second prĂ©voit la libĂ©ration de certains sites benzoates et la rĂ©gĂ©nĂ©ration d'hydroxyles basiques forts. Le classement suivant les activitĂ©s dĂ©croissantes prĂ©sentĂ© prĂ©cĂ©demment est complĂštement inversĂ©: a (ZnO) >> a(ZrO2) > a (MgO) =
Importance des comorbiditĂ©s dans lâanĂ©mie de la BPCO : impact mĂ©dico-Ă©conomique et survie Ă 3 ans
Mise au point sur la téléréadaptation respiratoire dans la BPCO
International audienceTelerehabilitation brings together a set of rehabilitation practices applied remotely by means of information and communication technologies. Even though it has been taking on increasing importance in many health fields over 10 years, telerehabilitation had yet to find its place in pulmonary rehabilitation before 2020, when the pandemic situation impelled numerous teams to put it to work. Pilot studies on respiratory diseases, primarily COPD, along with recent data from randomized or non-randomized studies, have enhanced our understanding of "remote" practice. In this review of the literature, we will show that pulmonary telerehabilitation is feasible, safe and likely to yield short-term (and possibly longer term) effects generally similar to those achieved in the pulmonary rehabilitation programs of specialized centers, especially as regards some indicators of exercise tolerance, dyspnea or patient quality of life. However, the number of studies and patients included in these programs remains too limited in terms of modalities, duration, long-term effects, or adaptations in case of exacerbation to be the subject of recommendations. The potential of respiratory telerehabilitation justifies continuing clinical trials and experiments, which need to be coordinated with the interventions characterizing a conventional program
Convulsions et Ă©pilepsie : reprĂ©sentations et croyances populaires de lâantiquitĂ© au xixe
International audienc
PropriĂ©tĂ©s structurales de zĂ©olithes Y chromĂ©es relation avec lâactivitĂ© catalytique
LâĂ©change du sodium par le chrome stabilise la charpente zĂ©olithique. Au-dessus dâun taux de 8 chromes par maille, lâĂ©change confĂšre Ă la zĂ©olithe NaY une activitĂ© dans lâisomĂ©risation du mĂ©thyl-3 pentane, renforçant les propriĂ©tĂ©s craquantes et isomĂ©risantes habituellement observĂ©es sur les Ă©chantillons ammoniĂ©s. On observe un effet synergĂ©tique important du chrome et de lâammonium Ă©changĂ©s. Ces propriĂ©tĂ©s sont renforcĂ©es par une activation oxydante.Les ions chromes se placent prĂ©fĂ©rentiellement en site lâ, mais lâaciditĂ© quâils portent nâest pas directement Ă lâorigine de lâactivitĂ© observĂ©e
Importance des comorbiditĂ©s dans lâanĂ©mie de la BPCO : impact mĂ©dico-Ă©conomique et survie Ă 3 ans
International audienceINTRODUCTION: Anemia occurs commonly in COPD and is associated with a poor prognosis. The role of comorbidities in this is suspected but poorly characterized and the economic implications of anemia combined with COPD in France have not been studied. The healthcare resource utilization and cost impact of anemia remain to be investigated. METHODS: One hundred and fifty-one COPD patients attending a pulmonology outpatient department during a 6 months period were retrospectively selected if they had undergone a pulmonary function test, a blood gas analysis or a blood count. The Charlson comorbidity index, resource utilization and economic data from the year before the diagnosis of anemia were compared between anemic and non-anemic patients as well as 3-year survival analysis. RESULTS: The prevalence of anemia was 18.5% and was not influenced by GOLD stage. The identification of anemia was similar from blood gas results and full blood count analysis. Comorbidities - mainly cardiovascular - were found in 86% of the anemic patients. The Charlson index was 5.4±2 in the anemic group compared to 4.1±1.5 in the non-anemic group (P\textless0.01). The Charlson index was the only predictive factor of anemia using logistic regression analysis. The 3-year mortality was 36% in the anemic versus 7% in the non-anemic group (P\textless0.05). The main factor identified which predicted 3-year mortality was the presence of anemia using logistic regression. Healthcare costs the year prior to the diagnosis of anemia were not significantly different between groups, but there was a tendency to an increase in the cost of the hospitalizations in the anemic group. CONCLUSIONS: Anemia is easy to diagnose in COPD from the blood gas analysis. It is frequently linked to the presence of comorbidities - mainly cardiovascular diseases - and is the more important predictive factor of the 3-year mortality. There was a tendency towards an increase in the costs of hospitalizations in anemic patients but this remains to be confirmed in a larger economic study
Mesure ambulatoire de la force maximale volontaire isométrique du quadriceps chez le patient BPCO
International audienc
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