A cross-sectional study of blood selenium concentration and cognitive function in elderly Americans: National Health and Nutrition Examination Survey 2011–2014

Background Cognitive decline can develop into mild cognitive impairment, a high-risk factor in the progression of Alzheimer’s disease. The antioxidant micronutrient selenium may have some effect on preventing cognitive decline, but the association between whole blood selenium concentration and cognitive function remains controversial. Aim To investigate the association between whole blood selenium concentration and cognitive function score in elderly Americans. Subjects and methods Data was obtained from the national health and nutrition survey between 2011 and 2014. A general linear model was used to adjust for possible risk factors to analyse the association between blood selenium concentration and cognitive function. Results 2068 participants were included in our study, and the average blood selenium concentration was high at 195.08 μg/L. The risk of lower cognitive scores was higher in people with lower blood selenium concentration (p < 0.05). The lower cognition may also be associated with one or more of the following characteristics: older, male, had a low poverty-income ratio, low education level, and consumed less alcohol. Related conditions such as stroke, diabetes and high blood pressure may also affect cognitive scores. Conclusions Higher blood selenium is associated with higher cognitive scores in elderly Americans

Influence of Transition Metal on the Hydrogen Evolution Reaction over Nano-Molybdenum-Carbide Catalyst

The highly efficient electrochemical hydrogen evolution reaction (HER) provides a promising way to solve energy and environment problems. In this work, various transition metals (Fe, Co, Ni, Cu, Ag, and Pt) were selected to support on molybdenum carbides by a simple organic-inorganic precursor carburization process. X-ray diffraction (XRD) analysis results indicated that the &beta;-Mo2C phase was formed in all metal-doped samples. X-ray photoelectron spectroscopy analysis indicated that the binding energy of Mo2+ species (Mo2C) shifted to a lower value after metal was doped on the molybdenum carbide surface. Comparing with pure &beta;-Mo2C, the electrocatalytic activity for HER was improved by transition metal doping on the surface. Remarkably, the catalytic activity improvement was more obvious when Pt was doped on molybdenum carbide (2% Pt-Mo2C). The 2% Pt-Mo2C required a &eta;10 of 79 mV, and outperformed that of pure &beta;-Mo2C (&eta;10 = 410 mV) and other transition metal doped molybdenum carbides, with a small Tafel slope (55 mV/dec) and a low onset overpotential (32 mV) in 0.5 M H2SO4. Also, the 2% Pt-Mo2C catalyst demonstrated a high stability for the HER in 0.5 M H2SO4. This work highlights a feasible strategy to explore efficient electrocatalysts with low cost via engineering on the composition and nanostructure

Endoscopic radiofrequency ablation for early esophageal squamous cell neoplasia: report of safety and effectiveness from a large prospective trial

Endoscopic radiofrequency ablation (RFA) is an established therapy for Barrett's esophagus. Preliminary reports, limited by low patient numbers, also suggest a possible role for RFA in early esophageal squamous cell neoplasia (ESCN). The aim of this study was to evaluate the safety and effectiveness of RFA for early ESCN (moderate/high grade intraepithelial neoplasia [MGIN/HGIN] and early flat-type esophageal squamous cell carcinoma [ESCC]). This prospective cohort study included patients with at least one flat (type 0-IIb) unstained lesion (USL) on Lugol's chromoendoscopy and a consensus diagnosis of MGIN, HGIN, or early ESCC. RFA was used at baseline to treat all USLs, and then biopsy (and focal RFA if USL persisted) was performed every 3 months until all biopsies were negative for MGIN, HGIN, and ESCC. The main outcome measurements were complete response at 3 and 12 months (absence of MGIN, HGIN, and ESCC), neoplastic progression, and adverse events. A total of 96 patients participated (MGIN 45, HGIN 42, early ESCC 9). At 3 and 12 months, 73 % (70/96) and 84 % (81/96), respectively, showed a complete response. Two patients (2 %) progressed (MGIN to HGIN; HGIN to T1m2 ESCC); both were treated endoscopically and achieved complete response. Stricture occurred in 20 patients (21 %), all after circumferential RFA. Lugol's + RFA 12 J/cm(2) (single application, no cleaning) was the favored baseline circumferential RFA technique (82 % 12-month complete response [14/17], 6 % stricture [6/17]). In patients with early ESCN, RFA was associated with a high complete response rate and an acceptable safety profil

A randomized trial comparing multiband mucosectomy and cap-assisted endoscopic resection for endoscopic piecemeal resection of early squamous neoplasia of the esophagus

Piecemeal endoscopic resection for esophageal high grade intraepithelial neoplasia (HGIN) or early squamous cell carcinoma (ESCC) is usually performed by cap-assisted endoscopic resection. This requires submucosal lifting and multiple snares. Multiband mucosectomy (MBM) uses a modified variceal band ligator without submucosal lifting. In high-risk areas where ESCC is common and endoscopic expertise is limited, MBM may be a better technique. We aimed to compare MBM to the cap-assisted technique for piecemeal endoscopic resection of esophageal ESCCs. Patients with mucosal HGIN/ESCC (2 - 6 cm, maximum two-thirds of esophageal circumference) were included. Lesions, delineated by 1.25 % Lugol staining, were randomized to MBM or cap-assisted piecemeal resection. Endpoints were procedure time and costs, complete endoscopic resection, adverse events, and absence of HGIN/ESCC at 3-month and 12-month follow-up.  Endoscopic resection was performed in 84 patients (59 men, mean age 60) using MBM (n = 42) or the endoscopic resection cap (n = 42). There were no differences in baseline characteristics. Endoscopic complete resection was achieved in all lesions. Procedure time was significantly shorter with MBM (11 vs. 22 minutes, P  < 0.0001). One perforation, seen after using the endoscopic resection cap, was treated conservatively. Total costs of disposables were lower for MBM (€200 vs. €251, P = 0.04). At 3-month and 12-month follow-ups none of the patients had HGIN/ESCC at the resection site. Piecemeal endoscopic resection of esophageal ESCC with MBM is faster and cheaper than with the endoscopic resection cap. Both techniques are highly effective and safe. MBM may have significant advantages over the endoscopic resection cap technique, especially in countries where ESCC is extremely common but limited endoscopic expertise and resources exist. (Netherlands trial register: NTR 3246.