Place cell with location tuning characteristics play an important role in brain spatial cognition and navigation, but there is relatively little research on place cell screening and its influencing factors. Taking pigeons as model animals, the screening process of pigeon place cell was given by using the spike signal in pigeon hippocampus under free activity. The effects of grid number and filter kernel size on the place field of place cells during the screening process were analyzed. The results from the real and simulation data showed that the proposed place cell screening method presented in this study could effectively screen out place cell, and the research found that the size of place field was basically inversely proportional to the number of grids divided, and was basically proportional to the size of Gaussian filter kernel in the overall trend. This result will not only help to determine the appropriate parameters in the place cell screening process, but also promote the research on the neural mechanism of spatial cognition and navigation of birds such as pigeons.
Colorectal cancer (CRC) screening is effective in reducing the burden of the disease. Participation rate is an important determinant of the magnitude of the effectiveness in population-based CRC screening. We summarize the current status of participation rate across the different organized CRC screening programs in China. The results indicate that the overall participation rates are low, and the acceptance of the screening protocols is poor in Chinese population. We conclude that the associated factors may include the poor health consciousness, low willingness-to-pay for screening, lack of personalized screening strategy and inadequate organization. Studies on the inventions to improve the willingness of screening and participation rate are of high demand and will provide important references in implementing large-scale CRC screening programs in China in the future.
ObjectiveTo analyze the sensitivity of peak flow meter screening in different subgroups of chronic obstructive pulmonary disease (COPD).
MethodsA total of 156 outpatients with COPD from Peking Union Medical Hospital from May 2013 to December 2014 were recruited in the study. Each patient's symptoms,history of exposure to risk factors,and the times of exacerbation in last year was recorded. All patients completed CAT,mMRC,the St George's Respiratory Questionnaire (SGRQ),6 minutes walking test,spirometry,and peak expiratory flow (PEF) by peak flow meter.
ResultsUsing the cut-off of PEF%pred=80%,the PEF detected 120 COPD patients in 156 subjects. The predictive factors of abnormal PEF%pred in COPD was FEV1%pred and the total score of SGRQ (P<0.05). PEF screening could identify 76.9% of COPD patients,30.0%-60.0% of patients of less symptoms (mMRC<2 or CAT<10 or SGRQ<25),83.3%-90.9% of COPD patients with more symptoms (mMRC ≥ 2 or CAT ≥ 10 or SGRQ ≥ 25),27.7% of COPD patients with mild airflow limitation,68.5% of COPD patients with moderate airflow limitation,83.3% of COPD patients with moderate to very severe airflow limitation. When grouped by GOLD combined assessment method,PEF screening could identify 35.2% of patients of group A,75.0% of patients of group B,and 95.9% of patients of group C and D. The cut-off value of PEF% pred=80% showed low sensitivity to early stage of COPD,but when using the cut-off value of PEF% pred=95%,that sensitivity increased signifcantly.
ConclusionsPeak flow meter may be used as a tool to screen COPD. It can identify part of COPD patients especially for those patients with more symptoms,requiring regular treatment,with deteriorated pulmonary function and high risk of exacerbation.
ObjectiveTo systematically review the value of mass screening of serum pepsinogen test for Asian population with high-risk gastric carcinoma.
MethodsWe electronically searched databases including PubMed, EMbase, The Cochrane Library (Issue 12, 2013), CNKI, WanFang Data, VIP and CBM for diagnostic tests on serum pepsinogen test versus with pathological biopsy/X-ray examination (gold standard) between January 2004 and January 2014. Two reviewers independently screened literature according to the inclusion and exclusion criteria, extracted data, and assessed methodological quality of included studies. Then meta-analysis was conducted using Meta-DiSc software (version 1.4).
ResultsA total of 15 studies involving 180 934 subjects were included. ROC curve showed "shoulder-arm shape" distribution. The results of Spearman correlation analysis suggested a significance of the threshold effect (P=0.001). The results of meta-analysis showed that, the area under curve (AUC) was 0.74.
ConclusionSerum pepsinogen has good value in the screening of gastric carcinoma among Asian permanent residents. Due to limited quality of studies, the above conclusion should be verified by conducting more high quality studies.
ObjectiveTo systematically review the status of economic evaluation of liver cancer screening in China, so as to provide reference for further studies.MethodsPubMed, EMbase, The Cochrane Library, Web of Science, CNKI, WanFang Data, CBM and VIP databases were searched to collect economic evaluation studies of liver cancer screening in China from inception to December, 2017. Two reviewers independently screened literature, extracted data and conducted descriptive analysis of basic characteristics, methods of economic evaluation and main results as well as quality and uniformity of reporting.ResultsA total of 5 studies were included. Among them, the starting age of screening were found to be 35 to 45 years old; α-fetoprotein (AFP) testing and ultrasound examination combined procedure and screening interval of every 6 months were mostly evaluated. The quality of the 5 studies was satisfactory, and the uniformity of reporting was relatively acceptable, with a median score of 78% (range: 60% ~ 78%). Two population-based studies reported cost per liver cancer detected (44 thousand and 575 thousand yuan). Three studies reported cost-effectiveness ratio(CER) based on life year saved (LYS) and quality adjusted life year (QALY). Among these results, only 1 study from mainland China reported CER based on LYS (1 775 yuan), and the calculated ratio of CER to local GDP per capita was estimated as 0.1, while 2 studies from Taiwan province reported 4 CERs, and the ratios of CER to local GDP per capita ranged from 1.0 to 2.2.ConclusionsInformation from liver cancer endemic areas such as Taiwan province indicates promising cost-effectiveness to conduct liver cancer screening in local general population, while data from mainland suggests that conducting liver cancer screening combining AFP and ultrasound in high-risk population will be cost-effective, however only supported by 1 regional study. This needs to be verified by further economic evaluations based on randomized controlled trials or cohort studies as well as health economic evaluations.
ObjectiveTo explore the nutritional status of inpatients with chronic kidney disease (CKD) and analyze the factors affecting nutritional risk, to provide theoretical basis for further nutritional support.MethodsConvenience sampling method was adopted to select 719 inpatients with CKD as research subjects in a tertiary hospital in Chengdu, Sichuan Province from January to March 2018. Nutritional Risk Screening 2002 was used for nutritional risk screening, and chi-square test, t test, one-way analysis of variance, and multiple linear regression analysis were used to explore the influencing factors of nutritional risk.ResultsAmong the 719 cases, whose average nutritional risk score was 1.79±1.11, 158 cases had nutritional risk, accounting for 22.0%. There were statistically significant differences in nutritional risk score between patients of age<60 years and ≥60 years, between males and females, between patients with CKD stage 1-3 and stage 4-5, between patients with serum albumin level <30 g/L and ≥30 g/L, and between patients with and without anaemia (P<0.05). The results of multiple linear regression analysis showed that the nutritional risk score of CKD patients was negatively correlated to serum albumin level (P=0.016), positively correlated to age (P<0.001), and higher in females than that in males (P=0.001).ConclusionsInpatients with CKD have a higher nutritional risk, with age, gender and serum albumin as the main influencing factors. Based on the above factors, the medical staff should continue to take targeted intervention measures to assess the nutritional status of CKD inpatients early and conveniently, so as to provide scientific basis for further nutritional support and nutritional nursing.
ObjectiveTo sort out the historical evolution of diagnostic screening methods for pancreatic cancer, and to explore how to achieve early diagnosis and treatment of pancreatic cancer in the context of China’s large population base and economic development.MethodsSystematic review was performed. The computer was used to search databases inchuding CNKI, VIP, WanFang Data, Web of Science, PubMed and EMbase. Two researchers independently searched Baidu search engine to collect relevant reports on screening methods and effect evaluation of pancreatic cancer published before February 28, 2018, and a qualitative descroption was made.ResultsA total of 117 articles were included in the study. The exploration of screening methods for pancreatic cancer in China has experienced three stages: germination, enlightenment and growth. Current screening methods include clinical manifestations, imaging screening methods, serum tumor markers and molecular biology gene diagnosis, each of which had its advantages and disadvantages. Single method could not achieve higher specificity and sensitivity, and joint detection had become an inevitable trend. Considering the benefit of practical application, screening among high-risk groups could effectively reduce the population size and achieve accurate screening.ConclusionThere was a big gap between domestic and foreign research in screening for pancreatic cancer. Screening methods are diverse, and joint detection is an inevitable trend. Screening for pancreatic cancer in high-risk population will become a breakthrough under the technical bottleneck.
ObjectiveTo evaluate the diagnostic performance of different screening tools for sarcopenia in the community for the elderly with sarcopenia, and to provide evidence-based support for the accurate screening of elderly patients with sarcopenia. MethodsThe PubMed, Web of Science, Cochrane Library, Embase, CINAHL, VIP, CBM, and WanFang Data databases were searched by computer, and the relevant research on the diagnosis of sarcopenia in the elderly by publicly published risk screening tools was found. The retrieval time was from inception to June 2023. Two researchers independently screened the literature, extracted data, and evaluated the quality of the included studies, and then data analysis was performed by using Stata 15.1 and Meta Disc 1.4 software. ResultsA total of 24 studies were included, including 10 961 patients, involving 8 risk screening tools for sarcopenia in the elderly: leg circumference, MSRA-5, MSRA-7, upper arm circumference, ring test, Ishii score, SARC-CalF and SARC-F. Meta-analysis showed that the combined sensitivities of eight screening tools were 0.84 (95% CI 0.61 to 1.15), 0.82 (95% CI 0.48 to 1.38), 0.80 (95% CI 0.47 to 1.36) and 0.72 (95%CI 0.33 to 1.55), 0.67 (95%CI 0.37 to 1.21), 0.63 (95%CI 0.33 to 1.19), 0.49 (95%CI 0.38 to 0.63), 0.24 (95%CI 0.18 to 0.30), and the combined specificities were 0.39 (95%CI 0.18 to 0.82)、0.52 (95%CI 0.29 to 0.93)、0.54 (95%CI 0.29 to 1.03)、0.62 (95%CI 0.49 to 0.79)、0.63 (95%CI 0.50 to 0.78).The results of reticular meta-analysis showed that the surface under the cumulative ranking curve (SUCRA) of the eight screening tools ranked from high to low according to the cumulative sensitivity: calf circumference (67.4%) > MSRA-5 (65.3%) > MSRA-7 (64.1%) > upper arm circumference (54.5%) > ring test (46.5%) > Ishii score. The values of specificity SUCRA from highest to lowest were as follows: SARC-F (72.2%) > SARC-CALF (71.3%) > Ishii score (60.2%) > ring test (57.1%) > upper arm circumference (40.1%) > lower leg circumference (36.2%) > MSRA-5. ConclusionThe simple screening tool for common sarcopenia has high sensitivity and high specificity, so medical staff can give priority to the combination of the two screening tools, namely SARC-CalF. Due to the limited quantity and quality of the included studies, more high-quality studies are needed to verify the above conclusion.
Currently,lung cancer (LC) has one of the highest incidence rates among various malignant tumors worldwide,and the annual mortality rate of LC has ranked first among all malignant tumors. About 80% of LC patients present to the hospital in a late advanced stage and lose the chance of surgical resection. Among all the patients who receive surgical treatment,the 5-year mortality rate of patients with early TNM stages is far lower than that of patients with advanced stage LC. With the advancement of medical equipment and more people who receive routine medical examination,more and more patients with small pulmonary nodules are discovered. Limited lung resection,including wedge resection and segmental resection,can be performed with minimally invasive video-assisted thoracoscopic surgery for these patients to acquire equivalent surgical outcomes as traditional lobectomy and a much better postoperative quality of life. LC screening increases the chances of early detection and diagnosis of LC patients,so these patients can receive reasonable diagnosis and treatment at an early stage. This strategy can greatly reduce treatment cost and mortality,and achieve maximal treatment benefits with minimal economic and medical cost. This review focuses on the necessity,high-risk groups,evaluation criteria and methods of LC screening with some LC screening guidelines and research studies in order to provide reasonable and feasible screening strategies and references for clinical LC screening.
The incidence of obesity and type 2 diabetes mellitus (T2DM) in adolescents has been rapidly increasing over the past two decades due to dramatic changes in dietary structure and physical activity. The incidence of diabetic retinopathy (DR), a serious vision-threatening complication of diabetes, is also increasing yearly in the adolescent population with T2DM. Due to the insidious onset of retinal diseases in the early stages, regular screening is important for the timely diagnosis of DR. However, there are still problems such as low attention of the population and insufficient screening rate. In the future, we should strengthen the health education of the adolescent population and optimize the control of risk factors such as blood glucose and blood pressure. At the same time, appropriate screening strategies should be actively developed, and the use of telemedicine and emerging technologies should be promoted for early detection of treatable lesions to improve patient prognosis.
