Objective To explore the clinical diagnostic value of high-frequency ultrasound and color Doppler ultrasound in detecting vibration-induced nerve and vascular injuries in patients with occupational hand-arm vibration disease (HAVD). Methods A total of 32 patients with mild occupational HAVD were enrolled as the case group, and 32 healthy volunteers were selected as the control group by the purposive sampling method. High-frequency ultrasound was used to observe the location, morphology, course and echogenic characteristics of the median nerve of the participants in both groups. The cross-sectional area (CSA) of the median nerve at the carpal tunnel inlet was measured. Color Doppler ultrasound was applied to observe the course of the proper palmar digital artery of the index finger, and hemodynamic parameters including peak systolic velocity (PSV), end-diastolic velocity (EDV) and resistive index (RI) were evaluated. Results In the case group, the transverse section of the median nerve among participants appeared flattened, the "honeycomb-like" structure was mildly blurred, epineurial echogenicity was slightly increased, and the margins of hyperechoic fascicles on longitudinal sections were indistinct. The CSA of the median nerve at the pisiform level and the palmar digital RI of the index finger were increased among the participants in the case group compared with the control group (both P<0.01), while PSV and EDV of the proper palmar digital artery of the index finger were decreased (both P<0.01). Conclusion High-frequency ultrasound and color Doppler ultrasound can detect morphological changes in the median nerve and hemodynamic alterations in finger vessels among patients with mild occupational HAVD, objectively reflecting neurovascular injury caused by hand-transmitted vibration and providing scientific and objective imaging evidence for the clinical diagnosis of occupational HAVD.

To analyze the clinical data and imaging examination data of a patient with metallic mercury poisoning from subcutaneous injection. The abdominal B-ultrasonograph results of the patient indicated multiple scattered hyperechoic spots accompanied by "comet tail" sign in the liver and right renal sinus, the nature of which was not clear and it was considered crystal deposition. The chest X-ray revealed scattered and multiple spot-like, snowflake-like and tree-cast-like high-density shadows in both lung fields. The chest computed tomography scan revealed multiple spot and patchy high-density shadows distributed in both lungs, considering hematogenous distribution deposits, and possible mercury poisoning. Laboratory test results showed that blood mercury level was 4.16 μmol/L and urine mercury level was 6 545.5 μg/g Cr. After 28 days of mercury chelation therapy, the abdominal ultrasound examination showed that the hyperechoic spots in the liver and right renal sinus were reduced compared with the previous examination. Metallic mercury poisoning from subcutaneous injection has specific manifestations in abdominal B-ultrasound imaging, which can provide a basis for the early diagnosis of metallic mercury poisoning in clinical practice and can be used to observe the efficacy of mercury chelation therapy.

Objective To analyze the epidemiological characteristics of occupational hand-arm vibration disease (OHAVD) in Guangdong Province from 2006 to 2022. Methods The data of newly reported OHAVD cases and suspected occupational disease cases in Guangdong Province from 2006 to 2022 was collected from the Report Card of Occupational Diseases and Report Card of Suspected Occupational Diseases using Occupational Diseases and Health Hazard Factors Monitoring Information System under China Disease Prevention and Control Information System. Epidemiological characteristics of the newly reported OHAVD cases and related suspected occupational disease reports were analyzed. Results A total of 660 newly reported OHAVD cases were reported in Guangdong Province from 2006 to 2022. The number of cases showed a periodic fluctuating trend over the years. Males accounted for 98.64% of the newly reported OHAVD cases with a median age of 38 years and a median hand-transmitted vibration exposure period of 8.7 years. These cases were predominantly distributed in the Pearl River Delta region, including Zhongshan City, Dongguan City, Guangzhou City, Shenzhen City and Foshan City, accounting for 99.25%. The manufacturing enterprises had 98.79% of the cases, investment enterprises of Hong Kong, Macao and Taiwan merchants of China had 83.18% of the cases, and large- and medium-sized enterprises had 92.73% of the cases. The 660 cases were distributed in 440 enterprises, but there were some characteristics of group outbreaks. There were 20 enterprises (4.55% of the total number of enterprises) had more than three cases involving 219 cases (33.18%). There were five enterprises which had more than 10 cases and the cases number ranged from 12 to 56. Among 382 newly reported OHAVD cases from 2014 to 2022, 44.24% were identified as suspected occupational diseases before diagnosis, of which 59.76% (101/169) were determined by occupational health inspection institutions. Conclusion Newly reported OHAVD cases in Guangdong Province were aggregated in terms of regional distribution, industry, enterprise ownership, and enterprise scale, with a risk of group outbreaks. It is suggested to enhance the OHAVD prevention and control in male workers exposed to hand-transmitted vibrations in the Pearl River Delta's manufacturing enterprises.

Purpose To preliminarily establish a predictive model for assessing preterm birth in the first trimester via clinical history and multiple ultrasound parameters.Materials and Methods This study included 200 women in the first trimester of pregnancy from 6 to 8 weeks in the Affiliated Renhe Hospital of Three Gorges University from September 2020 to September 2021,and their clinical history,two-dimensional imaging data and cervical elastography data were collected.Logistic regression analysis,screening and assignment were performed to initially establish a clinical prediction model for evaluating preterm birth during the first trimester.Results Finally,41 pregnant women developed preterm birth(preterm birth group),and 159 pregnant women did not develop preterm birth(term group).History of miscarriage,history of preterm birth,uterocervical angle(UCA),A,and A1 were the independent risk factors for preterm birth via univariate analysis,and multivariate analysis was carried out to obtain the formula:Logit(P)=1.495×abortion history+1.060×A1+0.795×UCA+1.354×A-14.951,which had a good fit via Hosmer-Lemeshow goodness-of-fit test,and the diagnostic efficiency was 96.9%.Conclusion The early pregnancy prediction model can effectively predict the occurrence of preterm birth in pregnant women with singleton pregnancy.

Objective Comparing with traditional teaching methods of oral histopathology, to probe whether the interactive teaching system of the digital microscope can improve the teaching effi-ciency of experiment of oral histopathology courses. Methods The subjects were the 2010 grade students (40 students) and the 2011 grade students (38 students) majoring in stomatology of South Medical University, and they were evenly divided into 2 groups at random. In the first part of the ex-periment of Grade 2010, the teaching of traditional optical microscope was used in a group of experi-mental courses, and interactive teaching with digital microscope was used in the other group. In the second part of the experiment the two groups swapped the teaching method. While in the whole exper-iment of Grade 2011, traditional optical microscopes were adopted in one group, and in contrast, the interactive teaching system of the digital microscope was adopted in the other group. The P values of the 5 indexes were less than 0.05. After the courses, the 2010 grade students received the questionnaire survey and the 2011 grade students received the quiz about the experimental course, and then the evaluation results of the two groups were compared for t inspection, using SPSS software t test. Result The questionnaire results of Grade 2010 showed that the scores of digital microscope interactive group were higher than those of traditional teaching group in satisfaction with teaching , teacher-student interaction, classroom atmosphere active degree, learning interest, and the understanding of the teach-ing content. The experiment course content test results of Grade 2011 showed that the digital interactive group students averaged 46.26, while the average score of the traditional teaching group was 42.78%. The difference between the two groups had statistical significance, P=0.001. Conclusion Compared with the traditional teaching methods, the interactive teaching system of the digital microscope can enhance the academic grades, improve the teaching efficiency of experiment of oral histopathology courses, and elevate the teaching quality.

Objective To analyze the drug-resistance and distribution of nonferments bacteria infection in our hospital and provide the diagnosis and treatment evidence to doctor.Methods 241 nonferments bacteria strains had been separated from patients of Xinqiao Hospital from July 2006 to Jan 2008. Bacteria identify and drug-resistance test were performed by VITEK-Ⅱanalysis system. The drug-resistance result was determined by MIC with the standard of NCCLS.Results The separate rate in patients of neurosurgery, respiration, orthopaedics were 24.94、23.27 and 10.79 respectively. The main source of specimen are sputum. The drug resistance rate were Imipenem (16.9), Amikacin(29.3), Cefepime (33.9) and Cefazidime(39.1) in 241 nonferments bacteria strains. Conclusion The infection of nonferments bacteria must be recognized by doctors, and it would prompt us to use antibiotic properly.