University of Rennes

About: University of Rennes is a education organization based out in Rennes, France. It is known for research contribution in the topics: Population & Catalysis. The organization has 18404 authors who have published 40374 publications receiving 995327 citations.

Prevalence and impact of frailty on mortality in elderly ICU patients: a prospective, multicenter, observational study.

Abstract: Frailty is a recent concept used for evaluating elderly individuals. Our study determined the prevalence of frailty in intensive care unit (ICU) patients and its impact on the rate of mortality. A multicenter, prospective, observational study performed in four ICUs in France included 196 patients aged ≥65 years hospitalized for >24 h during a 6-month study period. Frailty was determined using the frailty phenotype (FP) and the clinical frailty score (CFS). The patients were separated as follows: FP score <3 or ≥3 and CFS <5 or ≥5. Frailty was observed in 41 and 23 % of patients on the basis of an FP score ≥3 and a CFS ≥5, respectively. At admission to the ICU, the Simplified Acute Physiology Score II (SAPS II) and Sequential Organ Failure Assessment (SOFA) scores did not differ between the frail and nonfrail patients. In the multivariate analysis, the risk factors for ICU mortality were FP score ≥3 [hazard ratio (HR), 3.3; 95 % confidence interval (CI), 1.6–6.6; p < 0.001], male gender (HR, 2.4; 95 % CI, 1.1–5.3; p = 0.026), cardiac arrest before admission (HR, 2.8; 95 % CI, 1.1–7.4; p = 0.036), SAPS II score ≥46 (HR, 2.6; 95 % CI, 1.2–5.3; p = 0.011), and brain injury before admission (HR, 3.5; 95 % CI, 1.6–7.7; p = 0.002). The risk factors for 6-month mortality were a CFS ≥5 (HR, 2.4; 95 % CI, 1.49–3.87; p < 0.001) and a SOFA score ≥7 (HR, 2.2; 95 % CI, 1.35–3.64; p = 0.002). An increased CFS was associated with significant incremental hospital and 6-month mortalities. Frailty is a frequent occurrence and is independently associated with increased ICU and 6-month mortalities. Notably, the CFS predicts outcomes more effectively than the commonly used ICU illness scores.

Millimeter-wave interactions with the human body: state of knowledge and recent advances

Abstract: The biocompatibility of millimeter-wave devices and systems is an important issue due to the wide number of emerging body-centric wireless applications at millimeter waves. This review article provides the state of knowledge in this field and mainly focuses on recent results and advances related to the different aspects of millimeter-wave interactions with the human body. Electromagnetic, thermal, and biological aspects are considered and analyzed for exposures in the 30-100 GHz range with a particular emphasis on the 60-GHz band. Recently introduced dosimetric techniques and specific instrumentation for bioelectromagnetic laboratory studies are also presented. Finally, future trends are discussed.