Risk and Cumulative Risk of Acute Ischemic Stroke Recurrence in China:A Systematic Review and Meta-Analysis

Objective:To comprehensively evaluate the risk of recurrence after initial ischemic stroke,and to provide a relatively comprehensive reference for the prevention and control of stroke recurrence.Methods:CNKI,VIP,Wanfang,PubMed,Web of Science,Embase and other databases were collected to investigate the status of recurrence after initial ischemic stroke,the search period of which was from the establishment of databases to March 2019.And then quality evaluation and data extraction were carried out.The overall cumulative risks of stroke recurrence at 3 months,6 months,1 year,2 years and 5 years after initial ischemic stroke were calculated,and heterogeneity analysis was performed.Results:A total of 29 studies from 19 provinces(cities,autonomous regions)in China were included.The cumulative total sample size was 22484 cases,the cumulative recurrent sample size was 3309 cases.The pooled cumulative risk was 4.5%(95%CI:3.1-5.8)at 3 months,7.8%(95%CI:5.6-10.0)at 6 months,13.6%(95%CI:11.0-16.2)at 1 year,17.5%(95%CI:12.4-22.6)at 2 years and 30.9%(95%CI:20.2-41.7)at 5 years after initial ischemic stroke.Conclusions:The recurrence rate of acute ischemic stroke in China is high.It is recommended that all levels of medical and health departments strengthen the prevention and treatment of ischemic stroke recurrence to reduce the recurrence of ischemic stroke and improve the prognosis of patients.

COLORIMETRIC DETECTION OF CARBENICILLIN USING CATIONIC POLYTHIOPHENE DERIVATIVES

A water-soluble, polythiophene-based colorimetric sensor was designed for selective and sensitive detection of carbenicillin in HEPES buffer solution. Quaternized quinine was linked to thiophene through bis-functionality benzyl group, which can interact with carbenicillin via electrostatic interaction and geometric match effect. The sensor exhibited a colorimetric signal change upon the addition of carbenicillin because of the formation of more nonplanar structures. However, the addition of other beta-lactarn antibiotics or dicarboxylic acids into the sensor solution caused no obvious changes in absorbance intensity ratio. This result may be attributed to the cavity formed by the semi-rigid framework of PTQ2, which is suitable for the special binding with carbenicillin. This novel sensor can effectively distinguish carbenicillin from other beta-lactam antibiotics and has a wide linear range response in HEPES buffer solution. Linear calibration curves are obtained with 0 to 18 μmol/L of HEPES buffer solution, with a limit of detection of 0.54μmol/L.

Development and application of nano-flavor-drug carriers in neurodegenerative diseases

Neurodegenerative disease is one of the serious diseases of the human nervous system.There is no effective way to treat neurodegenerative diseases.Flavors such as curcumin,coumarin,have attracted increasing attention due to having a beneficial therapeutic effect on Alzheimer＇s disease and Parkinson＇s disease.But the use of most drugs is limited in clinical treatment because of blood-brain barrier.The use of nano-drug carriers such as liposomes,polymer micelles,polymer nanoparticles and magnetic nanoparticles,which can carry drugs across the blood-brain barrier,has brought hope for the treatment of neurodegenerative diseases.