Objective·To verify the accuracy and clinical feasibility of fluoroscopic stereophotogrammetric analysis(FSA)technology based on two dimension(2D)-three dimension(3D)registration for early migration detection of aseptic loosening of joint prostheses.Methods·2D-3D registration algorithms centering on the light source and projected object respectively in FSA technology were verified under various working conditions through image synthesis experiments,and the feasibility of clinical application was verified through real model experiments.The image synthesis experiment established a perspective projection environment with the same parameters as the real environment in a virtual environment,the 2D perspective images of the 3D model(bone or prosthesis)during the six degrees of freedom transformation were recorded,and the six degrees of freedom transformation of the 3D model was restored by using different 2D-3D registration algorithms.The error of each registration algorithm was calculated.For real model validation,the migration between bone and prosthesis after joint replacement surgery was simulated with a high precision bone prosthesis migration simulator.The 3D model of the bone or prosthesis was reconstructed by using computed tomograph(CT)images and optical scanning,and the 2D perspective images before and after prosthesis migration were captured by using a fluoroscopy device.The migration of the prosthesis was restored by using FSA technology based on 2D-3D registration,and the error of FSA technology was calculated.Results·The accuracy of the 2D-3D registration algorithm centering on the light source was higher than that of the algorithm centering on the projected object under different working conditions.When the initial registration conditions were favorable,the algorithm centering on the light source reduced the rotation error compared to the algorithm centering on the projected object,with a statistical difference(P=0.021),and the displacement error decreases,with a significant statistical difference(P=0.000).Moreover,algorithms centering on the light sources required lower similarity and fewer registration times to meet clinical application requirements.Conclusion·The accuracy of FSA technology based on 2D-3D registration in early migration detection of artificial joint prostheses meets clinical application requirements.This technology can warn of late aseptic loosening of prostheses by detecting early migration of prostheses after joint replacement surgery,and is expected to be applied to clinical practice through further research.

Nuclear medicine plays an indispensable role in the diagnosis,treatment,and prognosis of a wide range of diseases.Nuclear medicine using radionuclides for diagnosis has the advantages of accuracy,speed,high sensitivity and high resolution.Currently,several radionuclides play pivotal roles in disease diagnosis.This article primarily examines the clinical application and research of diagnostic radionuclides,including 18 F,89 Zr,68 Ga,99m Tc,131 I,123 I,and 11 C.The objective is to offer valuable insights for disease diagnosis and staging of diseases.

Objective:To explore the clinical feasibility of finger-pressing therapy based on the theory of treating impotence alone with Yang Ming to reduce incidence of ICU acquired weakness (ICU-AW) in critically ill children and provide a feasible nursing plan for ICU acquired asthenia in critically ill children.Methods:A quasi-experimental study was conducted. A total of 73 critically ill children were admitted to the PICU of Kunming Children′s Hospital from January 1 to April 30, 2021. According to the random number table, the subjects were divided into the observation group (37 cases) and the control group (36 cases). Children in the control group received routine PICU nursing. The children in the observation group were treated with PICU routine nursing and finger-pressing therapy based on the theory of treating impotence alone with Yang Ming. The two groups were compared in terms of limb muscle strength score (MRC-Score), incidence of ICU-AW, basic activities of life (Barthel Index, BI), limb muscle thickness.Results:After intervention, the MRC-Score of the observation group was 50 (46, 52) points, which was higher than 46 (40, 48) points of the control group, and the difference between the two groups was statistically significant ( Z=-3.70, P<0.05). The incidence of ICU-AW in the observation group was 32.43% (12/37), and the incidence of ICU-AW in the control group was 72.22% (26/36). The difference between the two groups was statistically significant ( χ2=11.58, P<0.05). The BI score of the observation group was 63 (50, 70), which was higher than 44 (40,60) of the control group, and the difference between the two groups was statistically significant ( Z=-3.94, P<0.05). The reduction degree of quadriceps femoris thickness in the observation group at D3-D1 was (-0.381 ± 0.131) cm, which was lower than (-0.762 ± 0.182) cm in the control group, and the difference between the two groups was statistically significant ( t=10.29, P<0.05). Conclusions:The application of finger-pressing therapy guided by theory of treating impotence alone with Yang Ming in the early rehabilitation of critically ill children can enhance muscle strength, prevent muscle atrophy and reduce the incidence of ICU-AW in critically ill children.

Objective:To explore the clinical effect of the application of intraoperative psoas major intramuscular block therapy on the complications related to the approach after multi-segmental crenel lumbar interbody fusion (CLIF).Methods:All of 68 degenerative lumbar scoliosis patients who had received multi-segmental crenel lumbar interbody fusion during January 2020 and June 2020 were retrospectively reviewed. Patients were divided into two groups according to whether the psoas major muscle was treated with block therapy during the operation. The psoas muscle inblock group were filled with gel sponge infiltrated with a mixture of Betamethasone and lidocaine for local block therapy before closing the incision while that in the control group were not filled with gel sponge. There were 33 patients in the control group, 7 males and 26 females with an average of 65.8±7.1 years old (range: 54-81 years old); 35 cases in the block group, 9 males and 26 females with an average of 68.0±6.5 years old (range: 54-85 years old). The complications related to the approach (mainly includes pain, numbness in the front of the thigh, as well as psoas major, quadriceps muscle strength) were recorded respectively 1 day, 1 week, 1 month and 3 months after surgery. The main indicators of outcome including visual analog scale (VAS) of pain, the visual analog scale (VAS) of numbness, muscle strength of psoas major and quadriceps femoris, and the incidence of complications related to the approach were compared between the two groups of patients at different time points after surgery. The clinical outcomes were assessed using the Oswestry disability index (ODI), VAS for low back pain. The radiological outcome was evaluated with Cobb angles and sagittal balance parameters (sagittal vertical axis, SVA).Results:There were no significant differences in age, gender, body mass index (BMI), number of fusion segments, operation time, and intraoperative blood loss between the two groups. The incidence of approach-related complications was 17.1% in the block group and 39.4% in the control group, with statistically significant difference between the two groups ( χ2=4.177, P=0.041). The incidence of postoperative pain, numbness in the front of the thighs, and muscle strength of psoas major in the block group (11.4%, 14.3%) were lower than those in the control group (33.3%, 36.4%) ( χ2=4.740, P=0.029; χ2=4.416, P=0.036). And for numbness in the front of thigh, the block group (14.3) was lower than control group (21.2%), but no significant difference was shown between two groups ( χ2=0.561, P=0.454). However, there was no quadriceps weakness in either group. The VAS scores of painof the block group were lower than those of the control group at 1 day, 1 week, and 1 month after surgery, and the difference was statistically significant ( t=2.220, P=0.031; t=2.235, P=0.031; t=2.086, P=0.044). The difference at 3 months was not statistically significant ( t=0.385, P=0.701). The muscle strength of psoas major of the block group, meanwhile, was higher than those of the control group on the 1day and 1 week after surgery, the difference was statistically significant as well ( t=2.208, P=0.032; t=2.171, P=0.034). The difference at 1 and 3 months was not statistically significant ( t=0.923, P=0.359; t=1.437, P=0.160). No statistically significant differences were found in VAS scores of numbness at 1 day, 1 week, 1 month, and 3 months after surgery. Postoperative low back pain and lumbar spine function were significantly improved in both groups, and there was no statistical significance between the two groups. Coronal Cobb angle and sagittal balance were significantly improved in both groups after surgery, and there was no statistical significance between the two groups. Conclusion:Psoas major intramuscular block therapy can reduce the incidence of early postoperative complications of multi-segmental CLIF. Furthermore, it was found to be effective to alleviate anterior thigh pain within 1 month, and improve psoas major muscle weakness within 1 week.

This study aimed to quantitatively assess the effectiveness of the Wuhan lockdown measure on controlling the spread of coronavirus diesase 2019 (COVID-19). : Firstly，estimate the daily new infection rate in Wuhan before January 23，2020 when the city went into lockdown by consulting the data of Wuhan population mobility and the number of cases imported from Wuhan in 217 cities of Mainland China. Then estimate what the daily new infection rate would have been in Wuhan from January 24 to January 30th if the lockdown measure had been delayed for 7 days，assuming that the daily new infection in Wuhan after January 23 increased in a high，moderate and low trend respectively (using exponential, linear and logarithm growth models). Based on that，calculate the number of infection cases imported from Wuhan during this period. Finally，predict the possible impact of 7-day delayed lockdown in Wuhan on the epidemic situation in China using the susceptible-exposed-infectious-removed (SEIR) model. : The daily new infection rate in Wuhan was estimated to be 0.021%，0.026%，0.029%，0.033% and 0.070% respectively from January 19 to January 23. And there were at least 20 066 infection cases in Wuhan by January 23，2020. If Wuhan lockdown measure had been delayed for 7 days，the daily new infection rate on January 30 would have been 0.335% in the exponential growth model，0.129% in the linear growth model，and 0.070% in the logarithm growth model. Correspondingly，there would have been 32 075，24 819 and 20 334 infection cases travelling from Wuhan to other areas of Mainland China，and the number of cumulative confirmed cases as of March 19 in Mainland China would have been 3.3-3.9 times of the officially reported number. Conclusions: Timely taking city-level lockdown measure in Wuhan in the early stage of COVID-19 outbreak is essential in containing the spread of the disease in China.
COVID-19 ; China/epidemiology* ; Cities ; Communicable Disease Control ; Humans ; SARS-CoV-2

To evaluate the impact of socioeconomic status，population mobility，prevention and control measures on the early-stage coronavirus disease 2019 (COVID-19) development in major cities of China. : The rate of daily new confirmed COVID-19 cases in the 51 cities with the largest number of cumulative confirmed cases as of February 19，2020 (except those in Hubei province) were collected and analyzed using the time series cluster analysis. It was then assessed according to three aspects，that is, socioeconomic status，population mobility，and control measures for the pandemic. : According to the analysis on the 51 cities，4 development patterns of COVID-19 were obtained，including a high-incidence pattern (in Xinyu)，a late high-incidence pattern (in Ganzi)，a moderate incidence pattern (in Wenzhou and other 12 cities)，and a low and stable incidence pattern (in Hangzhou and other 35 cities). Cities with different types and within the same type both had different scores on the three aspects. : There were relatively large difference on the COVID-19 development among different cities in China，possibly affected by socioeconomic status，population mobility and prevention and control measures that were taken. Therefore，a timely public health emergency response and travel restriction measures inside the city can interfere the development of the pandemic. Population flow from high risk area can largely affect the number of cumulative confirmed cases.
COVID-19 ; China/epidemiology* ; Cities ; Humans ; SARS-CoV-2 ; Social Class

To predict the epidemiological trend of coronavirus disease 2019 (COVID-19) by mathematical modeling based on the population mobility and the epidemic prevention and control measures. : As of February 8，2020，the information of 151 confirmed cases in Yueqing，Zhejiang province were obtained，including patients' infection process，population mobility between Yueqing and Wuhan，etc. To simulate and predict the development trend of COVID-19 in Yueqing, the study established two-stage mathematical models，integrating the population mobility data with the date of symptom appearance of confirmed cases and the transmission dynamics of imported and local cases. : It was found that in the early stage of the pandemic，the number of daily imported cases from Wuhan (using the date of symptom appearance) was positively associated with the number of population travelling from Wuhan to Yueqing on the same day and 6 and 9 days before that. The study predicted that the final outbreak size in Yueqing would be 170 according to the number of imported cases estimated by consulting the population number travelling from Wuhan to Yueqing and the susceptible-exposed-infectious-recovered (SEIR) model; while the number would be 165 if using the reported daily number of imported cases. These estimates were close to the 170，the actual monitoring number of cases in Yueqing as of April 27，2020. : The two-stage modeling approach used in this study can accurately predict COVID-19 epidemiological trend.
COVID-19 ; China/epidemiology* ; Disease Outbreaks ; Humans ; Models, Theoretical ; Pandemics ; SARS-CoV-2

The 2020 Nobel Prize in Chemistry recognized CRISPR-Cas9, a super-selective and precise gene editing tool. CRISPR-Cas9 has an obvious advantage in editing multiple genes in the same cell, and presents great potential in disease treatment and animal model construction. In recent years, CRISPR-Cas9 has been used to establish a series of rat models of drug metabolism and pharmacokinetics (DMPK), such as

Objective To explore the value of plasma Tau protein and resistin in early prediction of brain injury in premature infants caused by intrauterine infection. Method A total of 47 premature infants in NICU with early-onset sepsis were selected as infection group from January 2017 to October. According to the cranial MRI, the infection group was further divided into brain injury group (22 cases) and non-brain injury group (25 cases). In addition, 12 normal preterm infants were selected as the control group. Enzyme linked immunosorbent assay (ELISA) was used to detect plasma Tau protein and resistin levels on the first, third and seventh day after birth in three groups. Results The Tau protein in the brain injury group increased significantly on the first day, and then gradually decreased, while it was higher than that in the non-brain injury group and the control group at all time points, and there were statistical differences (P<0.05). At different time points, there was no difference in the level of Tau protein between the non-brain injury group and the control group (P>0.05). The level of resistin in the brain injury group increased significantly on the first day until the third day, and significantly decreased in the seventh day, and it was higher than that in the non-brain injury group and the control group at all time points, and there were statistical differences (P<0.05). Resistin increased on the first day, then gradually decreased, and returned to normal on the seventh day in the non-brain injury group. Conclusion Detection of plasma Tau protein and resistin levels within 3 days after birth may be helpful for early prediction of brain damage in premature infants with intrauterine infection.

Objective: To evaluate the self-developed intelligent assist order system for parenteral nutrition on the control of concentration exceeding standard of positive ions.Methods: The special comments, pharmacist audit and information control were used to intervene the concentration exceeding standard of positive ions in parenteral nutrition orders and the effect of the three intervention methods were evaluated.Results: For the intervention of concentration exceeding standard of positive ions in parenteral nutrition orders, the information control was better than the special comments and pharmacists audit.Conclusion: The intelligent assist order system for parenteral nutrition can solve the problem of concentration exceeding standard and promote the rational application of parenteral nutrition in hospitals.