The Combined Effect of the Initial Cure and the Type of Cement on the Natural Carbonation, the Portlandite Content, and Nonevaporable Water in Blended Cement

The aim of this work is to better understand the physical and chemical phenomena involved in hydrated mix (clinker + addition) during the natural carbonation process, to characterize cement with supplementary cementitious materials (SCMs) under various curing environment. The prepared cement pastes were characterized by thermogravimetric analysis. The results showed a considerable influence of the environment on the properties of mortars and cement and a perfect correlation between compressive strength, natural carbonation, nonevaporable water, and portlandite content. It was observed that the reduction of the curing period makes the mortars more sensitive. The kinetics of process was evaluated from Ca(OH)2 content and nonevaporable water contained in mortars. These two parameters reflect the hydration progress of the water/cement ratio studied. The weight loss due to Ca(OH)2 decomposition, calculated by DTA/TG analysis, shows the effect of the pozzolanic reaction and the natural carbonation. The supplementary cementitious materials (SCMs) play a considerable role in the slowing down of the aggression environment

Interest of 3D Fat-Saturated T1-Weighted Magnetic Resonance Imaging for the Assessment of Cervical Artery Dissection

No abstract availabl

Prise en charge diagnostique et thérapeutique de l'hydrothorax en dialyse péritonéale.

Hydrothorax is a rare mechanical complication of peritoneal dialysis (PD) which often results in discontinuation of the technique. According to studies, its incidence is estimated  at 1.6 to 2%. In the majority of cases, its location is on the right. It is secondary to the passage of dialysate from the peritoneal cavity to the pleural space through a diaphragmatic breach, which may be acquired or congenital. The additional tests necessary to confirm the diagnosis are often invasive and expensive, and are not the subject of any consensus. It is the same for the therapeutic management, which goes from the simple transient interruption of the dialysis to heavy treatments such as thoracotomy. In our center, we have opted to simplify the management of patients with hydrothorax. From a diagnostic standpoint, we use simple, minimally invasive and less expensive examinations. For the therapeutic management, we have opted, since our first case in 2000, for a simple and less aggressive surgical technique, with an abdominal and non-thoracic approach allowing the installation of a sub-diaphragmatic prosthesis by laparoscopic route to seal the lesions breaches. Out of 10 operated patients, 2 (20%) presented with a relapse of hydrothorax and were permanently transferred to hemodialysis. The remaining 8 (80%) were able to resume PD without subsequent recurrence or complications, after a 3- to 4-week PD interruption period during which all patients were hemodialyzed through a simple central catheter.  L’hydrothorax est une complication mécanique rare de la dialyse péritonéale (DP) qui aboutit souvent à une sortie de la technique. Son incidence est estimée selon les études de 1,6 à 2 %. Sa localisation est dans la majorité des cas à droite. Il est secondaire au passage du dialysat de la cavité péritonéale vers l’espace pleural à travers une brèche diaphragmatique, qui peut être acquise ou congénitale. Les examens complémentaires nécessaires pour affirmer le diagnostic sont souvent invasifs et couteux et ne font l’objet d’aucun consensus. Il en est de même pour la prise en charge thérapeutique qui va de la simple interruption transitoire de la dialyse à des traitements lourds comme la thoracotomie. Dans notre centre, nous avons opté pour une simplification de la prise en charge des patients présentant un hydrothorax. Sur le plan diagnostique, nous avons recours à des examens simples, peu invasifs et moins couteux. Pour la prise en charge thérapeutique nous avons opté, depuis notre premier cas en 2000, pour une technique chirurgicale, simple et moins agressive avec un abord abdominal et non thoracique permettant la mise en place d’une prothèse sous diaphragmatique par voie coelioscopique pour colmater les brèches. Sur 10 patients opérés, 2 (20%) ont présenté une récidive de l’hydrothorax et ont été transférés définitivement en hémodialyse. Les 8 autres (80%) ont pu reprendre la DP sans récidive ou complication ultérieure, après une période d’arrêt de la DP de 3 à 4 semaines pendant laquelle les patients étaient tous hémodialysés sur un cathéter central simple

Light scattering in aqueous solutions of κ-carrageenan

International audienc

Low incidence of SARS-CoV-2, risk factors of mortality and the course of illness in the French national cohort of dialysis patients

International audienceThe aim of this study was to estimate the incidence of COVID-19 disease in the French national population of dialysis patients, their course of illness and to identify the risk factors associated with mortality. Our study included all patients on dialysis recorded in the French REIN Registry in April 2020. Clinical characteristics at last follow-up and the evolution of COVID-19 illness severity over time were recorded for diagnosed cases (either suspicious clinical symptoms, characteristic signs on the chest scan or a positive reverse transcription polymerase chain reaction) for SARS-CoV-2. A total of 1,621 infected patients were reported on the REIN registry from March 16th, 2020 to May 4th, 2020. Of these, 344 died. The prevalence of COVID-19 patients varied from less than 1% to 10% between regions. The probability of being a case was higher in males, patients with diabetes, those in need of assistance for transfer or treated at a self-care unit. Dialysis at home was associated with a lower probability of being infected as was being a smoker, a former smoker, having an active malignancy, or peripheral vascular disease. Mortality in diagnosed cases (21%) was associated with the same causes as in the general population. Higher age, hypoalbuminemia and the presence of an ischemic heart disease were statistically independently associated with a higher risk of death. Being treated at a selfcare unit was associated with a lower risk. Thus, our study showed a relatively low frequency of COVID-19 among dialysis patients contrary to what might have been assumed