Objective To introduce the causes of accidents and the diagnosis and treatment of two patients with radiation-induced skin injury admitted to our hospital in 2023, and to provide a reference for the clinical treatment of subsequent radiation-induced skin injury. Methods The clinical treatment process of two patients with acute skin injury caused by external radiation exposure were summarized and analyzed. Results The exposure history of the two patients was reconstructed, the flaw detection scenario was simulated, the biological dose and hand skin exposure dose were estimated, and the infrared thermal imaging device was used for dynamic monitoring. A comprehensive analysis was conducted based on clinical manifestations and other data. The diagnosis of “Xie” was excessive exposure combined with acute radiation-induced skin injury on both hands (Grade IV for the right hand palm, index finger, and middle finger and Grade II for the left hand little finger). The diagnosis of “Hao” was acute radiation-induced skin injury on both hands (Grade I). The two patients received different clinical treatment measures: “Xie” was treated with both local and systemic therapies, while “Hao” was mainly treated with systemic therapy. Conclusion After systematic and effective treatment, the radiation-induced skin injuries healed in both patients.

Objective To explore medical institution-led exercise training interventions,prelimina-ry preventive measures,and comprehensive health service strategies for elderly adults.Methods Sixty elderly adults from communities under the jurisdiction of primary hospitals who voluntarily participated in the training and met the inclusion criteria were divided into 75 to 79 years old group and 80 to 84 years old group.Elastic bands exercise were selected as the method for physical training for elderly community members.A total of three sets(9 items)of exercise,including upper and lower limb mus-cle strength exercises and balance as well as coordination training,were designed.The training period lasted for 12 weeks,with each session lasting 1 hour,three times a week.The medical team partici-pated in training supervision and follow-up evaluations throughout the process,dynamically adjusting the training intensity based on individual needs.Results Comprehensive safety and support meas-ures significantly improved training participation and completion rates.No sports injuries or adverse events occurred throughout the process,and all participants completed the training plan.After train-ing,statistically significant differences were observed in grip strength,five-times sit-to-stand test duration,Berg Balance Scale(BBS)scores,and Timed Up and Go(TUG)test results(P＜0.05),indicating effective physical fitness improvement.Conclusion Elastic band exercises are a suitable mode for physical improvement training among elderly adults,significantly enhancing muscle strength in the limbs and trunk and improving balance function.The positive communication and in-teraction in group activities significantly boost elderly adults'confidence in healthy living,leading to notable improvements in their mental state.

Objective:To summarize the clinical features and pregnancy outcomes of fetal micrognathia.Methods:This retrospective study enrolled 52 cases of fetal micrognathia diagnosed at Shandong Provincial Maternal and Child Health Hospital Affiliated to Qingdao University and Affiliated Maternity and Child Health Care Hospital of Nantong University from January 2014 to December 2022. Clinical features, genetic testing results, and pregnancy outcomes of the cases were summarized. These cases were divided into two groups based on whether they were complicated by other system anomalies: non-isolated micrognathia (49 cases) and isolated micrognathia (three cases). The non-isolated micrognathia cases were further divided into two subgroups: cleft palate group (21 cases) and non-cleft palate group (28 cases). Clinical features were compared between different groups. Statistical analysis was performed using two independent samples t-test, Chi-square test, or Fisher's exact test. Results:(1) The non-isolated micrognathia cases were complicated by one to six system anomalies, with the most common being facial anomalies (59.2%, 29/49), followed by circulatory system (51.0%, 25/49), musculoskeletal system (44.9%, 22/49), nervous system (34.7%, 17/49), digestive system (12.2%, 6/49), and urinary system anomalies (8.2%, 4/49). (2) Among 52 cases, nine non-isolated micrognathia cases received genetic testing, and the results indicated six with genetic abnormalities. (3) Forty-seven cases chose to terminate the pregnancies, while the other five cases continued the pregnancies (all fetuses were non-isolated micrognathia) and resulted in live births. Treatment was withdrawn in one live birth due to multiple anomalies, and the other four neonates required mechanical ventilation (two died after withdrawal of treatment; two underwent surgeries after birth and the prognosis of them was good during a one-year outpatient follow-up). (4) The proportion of women with polyhydramnios [28.6% (6/21) vs. 3.6% (1/28), Fisher's exact test, P=0.033] and the proportion of fetuses with confirmed Pierre Robin sequence [85.7% (18/21) vs. 7.1% (2/28), Fisher's exact test, P<0.001] were higher in the cleft palate group than those in the non-cleft palate group. Conclusions:Fetal micrognathia cases revealed by prenatal ultrasound should undergo a comprehensive screening for other system anomalies, especially cleft palate. Fetuses with micrognathia and multiple system anomalies often have a poor prognosis. Besides, it is recommended to take genetic testing. For fetuses with micrognathia, preparations for neonatal resuscitation at birth are essential to avoid adverse outcomes due to breathing difficulties.

Objective: To evaluate the accuracy and feasibility of coronary artery calcium score ( CACS) on virtual non-contrast scan ( VNC) images obtained from coronary artery CT angiography ( CCTA) scan with dual －layer spectral detector CT (SDCT) ． Methods : The data of 197 patients who underwent CCTA scan in hospital were analyzed retrospectively，and 88 patients with CACS ＞0 were further analyzed． Linear regression analysis of CACS and coronary artery calcium volume ( CACV) of true non-contrast (TNC) images and VNC images ( CACS-TNC， CACS-VNC，CACV-TNC，CACV-VNC) was performed to obtain linear regression equation and correction coefficients λ 1AVG and λ2AVG ．CACS-VNC and CACV-VNC were corrected by the corresponding regression equation and recorded as CCACS-VNC and CCACV-VNC，respectively．Spearman correlation coefficient was used for correlation analysis and Bland-Altman plot was used for consistency test．Mann-Whitney U test was used to compare the difference between the two groups. Results : For the total coronary artery，there was a strong correlation between CACS- TNC and CACS-VNC (rs = 0. 952，P ＜0. 001 ，λ 1AVG = 2. 19 ) ，CACV-TNC and CACV-VNC ( rs = 0. 954，P < 0. 001，λ2AVG = 1. 93) ．The results of Mann-Whitney U test showed that there was no significant difference between CACS-TNC and CCACS-VNC or between CACV-TNC and CCACV-VNC，and the Bland-Altman plot showed good consistency between CACS-TNC and CCACS-VNC ，CACV-TNC and CCACV-VNC． Conclusion VNC images based on SDCT can accurately measure CACS and be used for cardiovascular risk classification，which is expected to replace TNC scan and reduce the radiation dose of patients.

Objective:To explore the effects of Alpha-2-macroglobulin-rich serum (A2MRS) on knee post-traumatic osteoarthritis (PTOA).Methods:The knee PTOA models were constructed by transection of the anterior cruciate ligament (ACL) in 80 SD male rats, aged 2 months and weighing from 250 to 300 g, which were randomized into 4 groups ( n=20): a high dose group (A2MRS containing 20 μg/μL A2M administered), a low dose group (A2MRS containing 10 μg/μL A2M administered), a positive control group (normal saline administered), and a blank control group (the knee joint cut pseudooperatively and normal saline administered). HE, toluidine blue staining, safranine O staining, modified Mankin scoring and Osteoarthritis Research Society International (OARSI) scoring were conducted to evaluate and compare the therapeutic effects of A2MRS on the knee PTOA among the 4 groups. Results:The rat cartilage was thinner with patchy and cracked surface, and the chondrocytes were reduced and distributed unevenly in the positive control group, compared with the blank control group. The modified Mankin score (3.89±0.93) and OARSI score (10.05±0.72) in the positive control group were significantly higher than those in the blank control group (0.67±0.07 and 3.10±0.29) ( P<0.05). The rat cartilage was thicker with basically complete and crack-free surface, and the chondrocytes were increased and distributed more evenly in the high dose group and the low dose group, compared with the positive control group. The modified Mankin scores (1.33±0.50 and 1.56±0.53) and OARSI scores (6.30±0.64 and 4.75±0.66) in the high dose group and the low dose group were significantly lower than those in the positive control group ( P<0.05). However, there were no such differences between the high dose group and the low dose group ( P>0.05). Conclusion:A2MRS effectively delays the pathological process of knee PTOA.

Objective: To assess diet-related knowledge and behavior among primary and middle-school students in five cities of Anhui, and to provide evidence for nutrition education and intervention strategies. Methods: A multi stage stratified cluster random sampling method was used to select 2 045 students in five cities(Huaibei,Bengbu,Ma anshan,Hefei and Wuhu) of Anhui for a questionnaire survey on nutrition knowledge, diet behavior, food preferences, and diet education. Results: The overall rate of good nutritional awareness was 38.3%; students had the highest rate of awareness on plain water being the healthiest drink(91.6%). The overall rate of healthy food preferences was 51.5%, with milk and dairy products being the highest rated (66.4%). The overall rate of good diet behavior was 85.8%, with eating most meals on time and in appropriate quantities being the highest rated (87.7%). The overall rate of students with good diet education was 25.0%, while the rate of table cleaning was 73.0%. Middle school students had more knowledge of nutrition(χ 2=28.8), while primary school students had better healthy food preferences and diet behaviors(χ 2=31.3，77.6), and girls were more frequently involved in setting and clearing the table(χ 2=12.2)(P<0.05). Conclusion Insufficient nutrition knowledge, clear food preferences, unhealthy dietary behaviors, and a lack of diet education were observed in primary and middle school students in Anhui. Specific nutritional education in school settings should be developed, home school cooperation should be strengthened, and diet education activities should be increased to help primary and middle school students form a healthy lifestyle.

In recent years, heavy ion beams have received great attention in the field of malignant tumor radiotherapy due to their radiation physics and biological characteristics. The high rate of local tumor control is one of its advantages, but the control rate of metastatic lesions is still crucial in the treatment of most malignant tumors. Clinical studies on the combined conventional radiotherapy and immunotherapy suggest that the combination of the two can not only control the primary lesions, but may also reduce or completely eliminate distant metastatic lesions. High linear energy transfer radiation, especially heavy ion beams, may have stronger potential in combined immunotherapy. Therefore, this article focuses on the basic research progress of heavy ion beams regulating anti-tumor immune effects and their combined application with immunotherapy.

Background The ongoing new coronavirus pneumonia (Corona Virus Disease 2019,COVID-19) outbreak is spreading in China, but it has not yet reached its peak. Five million people emigrated from Wuhan before lockdown, potentially representing a source of virus infection. Determining case distribution and its correlation with population emigration from Wuhan in the early stage of the epidemic is of great importance for early warning and for the prevention of future outbreaks. Methods The official case report on the COVID-19 epidemic was collected as of January 30, 2020. Time and location information on COVID-19 cases was extracted and analyzed using ArcGIS and WinBUGS software. Data on population migration from Wuhan City and Hubei province were extracted from Baidu Qianxi, and their correlation with the number of cases was analyzed. Results The COVID-19 confirmed and death cases in Hubei province accounted for 59.91% (5806/9692) and 95.77% (204/213) of the total cases in China respectively. Hot spot provinces included Sichuan and Yunnan, which are adjacent to Hubei. The time risk of Hubei province on the following day was 1.960 times that on the previous day. The number of cases in some cities was relatively low, but the time risk appeared to be continuously rising. The correlation coefficient between the provincial number of cases and emigration from Wuhan was up to 0.943. The lockdown of 17 cities in Hubei province and the implementation of nationwide control measures efficiently prevented an exponential growth in the number of cases. Conclusion The population that emigrated from Wuhan was the main infection source in other cities and provinces. Some cities with a low number of cases showed a rapid increase in case load. Owing to the upcoming Spring Festival return wave, understanding the risk trends in different regions is crucial to ensure preparedness at both the individual and organization levels and to prevent new outbreaks.

The incidence of deep vein thrombosis has increased year by year in the world, and it has become one of the serious diseases that threaten human life. In severe cases, it can lead to fatal pulmonary embolism. The pathogenesis of deep vein thrombosis is the result of the interaction of multiple genetic environmental factors. Therefore, regulation of gene expression by modification of DNA and histones may help to further reveal the pathogenesis of deep vein thrombosis, and reactivation or silencing of some genes that are inhibited or overexpressed by aberrant methylation may be a major therapeutic target for deep vein thrombosis. The author reviews the current status of DNA methylation studies related to deep vein thrombosis.

Objective: To investigate current status and associated factors of preschool children’s physical fitness, in order to provide scientific basis for improving preschool children’s physical fitness. Methods: A total of 3 240 preschool children aged 3-6 years old in Kunshan city were selected through cluster sampling method. They were surveyed about physical fitness and influencing factors. Results: The number of excellence of preschool children’s physical fitness was 269, and the rate was 8.30 percent. The excellence rates of preschool children’s physical fitness in girls, high grade, non-residency in Jiangsu Province were higher(10.87%, 10.96%, 14.88%), and the excellence rate of preschool children’s physical fitness in premature group was lower(4.31%)(P<0.05). Further unconditioned logistic regression analysis found that girls, middle and high grade and non-residency in Jiangsu Province were the protective factors for the excellence of preschool children’s physical fitness, OR values were 1.96, 1.94, 2.45 and 1.87, respectively; premature was a risk factor for the excellence of preschool children’s physical fitness, OR value was 0.47. Conclusion Preschool children in Kunshan have poor physical fitness, especially in boys, low grade and premature groups. Education department and health department should work together to improve the preschool children’s physical fitness.