排序方式: 共有4条查询结果,搜索用时 15 毫秒
1
1.
2.
It has been recognized that heart rate variability (HRV), defined as the fluctuation of ventricular response intervals in atrial fibrillation (AFib) patients, is not completely random, and its nonlinear characteristics, such as multiscale entropy (MSE), contain clinically significant information. We investigated the relationship between ischemic stroke risk and HRV with a large number of stroke-naïve AFib patients (628 patients), focusing on those who had never developed an ischemic/hemorrhagic stroke before the heart rate measurement. The score was calculated from the baseline clinical characteristics, while the HRV analysis was made from the recording of morning, afternoon, and evening. Subsequently, we performed Kaplan–Meier method and cumulative incidence function with mortality as a competing risk to estimate the survival time function. We found that patients with sample entropy () 0.68 at 210 s had a significantly higher risk of an ischemic stroke occurrence in the morning recording. Meanwhile, the afternoon recording showed that those with 0.76 at 240 s and 0.78 at 270 s had a significantly lower risk of ischemic stroke occurrence. Therefore, at 210 s (morning) and 240 s ≤ s ≤ 270 s (afternoon) demonstrated a statistically significant predictive value for ischemic stroke in stroke-naïve AFib patients. 相似文献
3.
Al Lafi Abdul G. Al Abdullah Jamal Amin Yusr Alnama Tasneem Aljbai Yara Hasan Reem Alsayes Ghina 《Journal of Radioanalytical and Nuclear Chemistry》2019,321(2):463-472
Various composite adsorbents based on sulfonated poly(ether ether ketone)/manganese dioxide were prepared for the removal of stable and radioactive ions from contaminated aqueous solution. Batch adsorption experiments revealed superior adsorption capacities of the composite using very low initial concentration of studied elements. Starting with 1000 µg L−1 contaminated solution, the maximum equilibrium metal uptake capacity reached 2.0 mg g−1 for Pb2+, 1.9 mg g−1 for Cd2+, Cu2+ and Zn2+, and 3.7 mg g−1 for Co2+. In addition, the distribution coefficient reached 11,600 mL g−1 for 137Cs and 70,000 mL g−1 for 210Pb.
相似文献4.
1