Biomedical subjects

Vincent Morin

Publications and source records attributed to Vincent Morin.

4 recordsLinked to original sources

PubMed2006

Renal cell carcinoma in adults 40 years old or less: young age is an independent prognostic factor for cancer-specific survival.

OBJECTIVES: Renal cell carcinoma (RCC) is uncommon in young adults. Based on the few studies published to date, it is difficult to determine whether this tumour has a particular progression pattern. This retrospective, multicentre study analysed RCC in young patients, defined as </=40 yr old, compared to RCC in older patients. METHODS: Between 1988 and 2000, 1233 patients, 93 under 40 yr old and 1140 older (mean ages, 34.2 and 61.9 years, respectively) underwent surgery for RCC in four teaching hospitals. Clinical and biologic parameters at diagnosis were compared and subjected to univariate and multivariate analyses to study survival. Mean follow-up was 4.5 yr for young and 4.1 yr for older patients. RESULTS: When comparing younger to older patients, respectively, they had a lower male-to-female ratio (1.2 vs. 2.5), lower stage (84.9% vs. 67.4% pT1-pT2N0M0; p=0.001), and fewer clear-cell carcinomas (73.1% vs. 82%), but more papillary carcinomas (20.4% vs. 11.4%; p=0.01) and better 5-yr cancer-specific survival rates (90.8% vs. 78.3%; p=0.005). Independent prognostic factors for survival, in the order of decreasing impact, were tumor stage (p<0.0001), Fuhrman nuclear grade (p<0.0001), and age </=40 yr at diagnosis (risk ratio 0.4, p<0.047). Young patients tended to have a better 5-yr progression-free survival (80.5% vs. 70.7%; p=0.05). CONCLUSIONS: RCC in young adults was more often localised at diagnosis and had a better prognosis than the disease in older subjects. Age under 40 yr old was an independent prognostic factor for survival.

Adult↗

PubMed2006

Multi-scale approach continuously relating the microstructure and the macroscopic mechanical properties of plaster pastes during their settings.

A new multi-scale experimental approach is proposed to continuously relate the microstructure and the macroscopic mechanical properties of plaster pastes during their settings. (1)H NMR relaxometry is used to follow continuously and not destructively, the degree of hydration and the microstructure evolution during the setting and hardening of plaster paste. Transmission of shear and compressional ultrasonic velocities enable the determination of macroscopic mechanical properties of the material during the setting. On the basis of similar behaviors of Young's modulus and NMR-population of confined water as function of the degree of hydration, we conclude that NMR gives a better understanding of the evolution of the microstructure at the origin of a better control of the macroscopic mechanical properties.

Journal Article↗

PubMed2006

Probing microstructure evolution during the hardening of gypsum by proton NMR relaxometry.

We report a comprehensive proton NMR relaxation study of the water confined in the evolving porous structure of hardened gypsum prepared with different water-to-plaster ratios (w/p) and increasing additions of crushed gypsum. This study gives some new information on the microstructure, the water distribution, and the hydration kinetics without any drying or perturbing preparation. The bi-exponential transverse magnetization decay reveals the existence of two water populations in slow exchange. However, the different behaviors of these populations during saturation and desaturation experiments show evidence of a fast exchange of each population with the surface. Two modes of organization of the microstructure of this material are identified through an original model of exchange as a function of the water-to-plaster ratio (0.4 < or = w/p < or = 0.6 and 0.7 < or = w/p < or = 1). A clear gap is shown in the exchange rate value above w/p = 0.6 that could be representative of a percolation threshold. Both the method and the theory presented can be applied more widely to other porous media with reactive surface areas.

Journal Article↗

PubMed2005

Clinical, physiologic, and biologic impact of environmental and behavioral interventions in neonates during a routine nursing procedure.

UNLABELLED: The aim of this randomized crossover study was to evaluate the impact of environmental and behavioral interventions (EBI) on behavioral, physiologic, and biologic stress response during a weighing procedure in neonates. Three groups of 15 neonates included (A) gestational age (GA), < or =32 weeks; (B) GA, 32 weeks, 1 day to 36 weeks, 6 days; and (C) GA, > or =37 weeks. Each neonate experienced 2 weighing procedures with and without EBI. Pain was evaluated by using the Neonatal Infant Pain Scale (NIPS) and the Neonatal Pain and Discomfort Scale (EDIN). Heart rate and oxygen saturation were recorded. Salivary samples were obtained for cortisol assay. Cerebral tissue oxygenation index (TOI) was recorded with near-infrared spectroscopy. A significant decrease of NIPS and EDIN was observed with EBI versus control. Mean heart rate was lower with EBI. No difference in cortisol level changes was observed. For groups A and B, a trend of increased TOI was observed with EBI. We concluded that EBI during a nursing procedure provides a decrease in pain scores in preterm and term neonates with changes in heart rate. PERSPECTIVE: This study evaluates the impact of combined environmental and behavioral interventions on pain responses in neonates during a weighing procedure. The results indicate a decrease in behavioral pain scores and in heart rate for preterm and term neonates and a trend in increased brain oxygenation depending on gestational age.

Age Factors↗