OBJECTIVE To study the effects of bergapten in the treatment of liver fibrosis and its mechanism based on serum metabolomics. METHODS Forty mice were divided into normal control group （0.5% carboxymethyl cellulose sodium solution）， model group （0.5% carboxymethyl cellulose sodium solution）， and BP low-dose and high-dose groups （50， 100 mg/kg）， with 10 mice in each group. Except for the normal control group， the other three groups were all treated with carbon tetrachloride to induce liver fibrosis model； they were given relevant medicine/solution intragastrically， once a day， for consecutive 8 weeks. After the last medication， the levels of alanine aminotransferase （ALT） and aspartate aminotransferase （AST） in serum were detected， and liver pathological changes were observed； the expressions of α-smooth muscle actin （α-SMA） and Collagen Ⅰ were detected in liver tissue； the serum of the mice was collected for metabolomics analysis. RESULTS Compared with the model group， serum levels of ALT and AST and protein expressions of α-SMA and Collagen Ⅰ in liver tissue were decreased significantly in BP high-dose and low-dose groups （P＜0.05）， while liver fibrosis was improved significantly. Meanwhile， metabolomics analyses showed that there were a total of 175 serum differential metabolites in the BP high-dose group and model group， of which 18 substances were upregulated and 157 substances were downregulated； the main metabolic pathways involved in bergapten intervention were pyrimidine metabolism， butanoate metabolism， fatty acid synthesis， tyrosine metabolism， β-alanine metabolism， nicotinic acid and nicotinamide metabolism， glutathione metabolism， etc. CONCLUSIONS BP is effective in the treatment of liver fibrosis by regulating pyrimidine metabolism， butanoate metabolism， glutathione metabolism and so on in rats with liver fibrosis.

Humans ; China/epidemiology* ; SARS-CoV-2 ; COVID-19

Based on the characteristics of medical imaging specialty, this paper introduces in detail several features of standardized residency training in the Department of Radiology in our hospital, from the aspects of teaching purpose, preliminary preparation and specific implementation, namely, the morning reading and analysis of difficult cases, the analysis of postoperative cases and missed diagnosis cases, and the teaching reading. At the same time, it also deeply analyzes the advantages, existing problems and solutions of this teaching practice. In order to provide reference for improving the teaching quality of the standardized residency training in the Department of Radiology.

Objective:To explore the clinical application of lateral thoracic artery perforator flap in repairing local defect after breast conserving surgery.Methods:The clinical data of 48 breast cancer patients planned to finish breast conserving surgery were retrospectively analyzed. The patients were divided into plastic breast-conserving group and routine breast conserving group. In the plastic breast-conserving group, 24 patients local defect repaired with the lateral thoracic artery perforator flap. In the routine breast conserving group, 24 patients local defect repaired with the fascial flap around the cutting edge. The operation related indexes and cosmetic effect from two groups were compared.Results:Both groups of patients successfully completed breast conserving surgery. The plastic breast-conserving group patients had significantly increased in operation time, operative blood loss, incision length and drainage tube indwelling time compared with the routine breast conserving group; the differences were statistically significant ( t=6.99, 9.37, 21.74, 8.80, P<0.05). The rate of secondary surgery enlarged was lower than fhat in the routine breast conserving group, and the difference was statistically significant (χ 2=4.76, P<0.05). There were 3 cases in the plastic breast conserving group and 1 case in the conventional breast conserving group. The skin at the edge of the flap was ischemic necrosis in the 4 cases, which healed after dressing change and drainage, and there was no significant difference ( P>0.05). The evaluation of postoperative cosmetic effect showed that the excellent and good rate of the observation group was 91.7%, compared with the routine breast conserving group (58.3%); the difference was statistically significant (χ 2=7.11, P<0.05). All patients were followed up for average 24 months, and local recurrence and distant metastasis were not observed. Conclusions:The lateral thoracic artery perforator flap for filling local defects in the lateral quadrant or central region of breast cancer is feasible, easy to operate, hides incision scar, better cosmetic effect and worthy of clinical promotion.

Objective:To investigate the clinical value of radiomics based on computed tomography (CT) examination in preoperative differential diagnosis of pancreatic serous cystadenoma (SCA) and mucinous cystadenoma (MCA).Methods:The retrospective case-control study was conducted. The clinicopathological and imaging data of 154 patients with pancreatic cystic neoplasms who were admitted to the First Affiliated Hospital, Zhejiang University School of Medicine from January 2012 to December 2019 were collected. There were 24 males and 130 females, aged (50±13)years. Of the 154 patients, 99 cases were diagnosed as SCA and 55 cases were diagnosed as MCA. All the 154 patients underwent plain and enhanced CT scan of pancreas before operation. The clinical characteristics, radiology features and radiomics features of all patients were collected to construct the clinical characteristics model, radiology model, radiomics model and fused model. The receiver operating characteristic (ROC) curve of each model was drawn, and those constructed models were evaluated by area under the curve (AUC), accuracy, sensitivity, specificity, positive predictive value and negative predictive value. Based on the optimal model, the nomogram was constructed. Observation indicators: (1) establishment and validation of clinical characteristics model; (2) establishment and validation of radiology model; (3) establishment and validation of radiomics model; (4) establishment and validation of fused model; (5) nomogram of fused model. Measurement data with normal distribution were represented as Mean± SD, and comparison between groups was analyzed using the Mann-Whitney U test. Count data were described as absolute numbers or percentages, and comparison between groups was analyzed using the chi-square test or Fisher exact probability. Results:(1) Establishment and validation of clinical characteristics model: 3 clinical characteristics, including age, symptoms and preoperative serum CA19-9, were selected using multinomial logistic linear regression analysis to construct the clinical characteristics model. Result of the multinomial logistic linear regression analysis was expressed by formula ①: clinical characteristics model score=0.635-0.007×age+0.054×clinical symptoms+0.108×preoperative serum CA19-9. The ROC curve for the test dataset of clinical characteristics model was drawn. The AUC, accuracy, sensitivity, specificity, positive predictive value and negative predictive value of clinical characteristics model were 0.611(95% confidence interval as 0.488?0.734, P<0.05), 56.6%, 66.7%, 56.3%, 41.5%, 78.4% for the training dataset and 0.771(95% confidence interval as 0.624?0.919, P<0.05), 77.8%, 63.1%, 88.5%, 80.1%, 76.7% for the test dataset, respectively. (2) Establishment and validation of radiology model: 5 radiology characteristics, including tumor location, the number of tumors, tumor diameter of cross section, lobulated tumor and polycystic tumor (more than 6), were selected using multinomial logistic linear regression analysis to construct the radiology model. Result of the multinomial logistic linear regression analysis was expressed by formula ②: radiology model score=?0.034+0.300×tumor location+0.202×the number of tumors+0.014×tumor diameter of cross section?0.251×lobulated tumor?0.170×polycystic tumor (more than 6). The ROC curve for the test dataset of radiology model was drawn. The AUC, accuracy, sensitivity, specificity, positive predictive value and negative predictive value of radiology model were 0.862(95% confidence interval as 0.791?0.932, P<0.05), 78.8%, 81.8%, 77.5%, 62.8%, 90.2% for the training dataset and 0.853(95% confidence interval as 0.713?0.994), P<0.05), 88.9%, 89.4%, 88.5%, 85.0%, 92.0% for the test dataset, respectively. (3) Establishment and validation of radiomics model: 4 categories of a total 1 067 radiomics features were extracted from 154 patients with pancreatic cystic neoplasms, including 7 first-order histogram features, 53 texture features, 848 wavelet features and 159 local binary pattern features. A total of 896 stable radiomics features were retained to construct the model, based on the condition of intraclass correlation coefficient >0.9. After selected by variance threshold and correlation coefficient threshold, 350 radiomics features were retained. Fifty synthetic radiomics features were constructed based on the original features in order to obtain potential radiomics features, and the total number of radiomics features was 400. After analyzed by the five-fold recursive feature elimination, 22 radiomics features were screened out, including 13 wavelet features, 7 synthetic radiomics features and 2 local binary pattern features. The support vector machine algorithm was used to construct the radiomics model. The penalty coefficient 'C' and parameter 'γ' of the radiomics model were 35.938 and 0.077, respectively. The kernel function of the radiomics model was 'radial basis function kernel'. The ROC curve of radiomics model using 5-fold cross validation was drawn. The average AUC, accuracy, sensitivity, specificity, positive predictive value and negative predictive value of the radiomics model were 0.870 ( P<0.05), 83.1%, 81.8%, 83.8%, 73.8% and 89.2%, respectively. (4) Establishment and validation of fused model: the fused model was constructed after selecting the tumor location and lobulated tumor of radiology characteristics and radiomics score. Result of the multinomial logistic linear regression analysis was expressed by formula ③: fused model socre=?0.154+0.218×tumor location?0.223×lobulated tumor+0.621×radiomics score. The ROC curve for the test dataset of fused model was drawn. The AUC, accuracy, sensitivity, specificity, positive predictive value and negative predictive value of fused model were 0.893(95% confidence interval as 0.828?0.958, P<0.05), 83.7%, 81.8%, 84.5%, 71.1%, 90.9% for the training dataset and 0.966(95% confidence interval as 0.921?0.999, P<0.05), 91.1%, 84.2%, 96.2%, 94.1%, 89.3% for the test dataset, respectively. (5) Nomogram of fused model: the nomogram of fused model was illustrated with the Youden index of 0.416. Conclusion:The prediction model based on the radiomics signature and radiological features extracted from preoperative CT examination can make the differential diagnosis of pancreatic SCA from MCA.

The department of radiology, as one of the public platforms for standardized residency training, is very crucial to the training of high level clinicians and essential to improve quality of medical care. According to the present situation and existing problems of standardized residency training for the non-imaging professional residents in the department of radiology in China, combining with our practice, this article primarily explores the improvement of the rules and regulations, the specific arrangement of the rotation, daily and graduation examination forms, and training quality supervision, etc. We hope to improve the training quality of the non-imaging professional residents' rotation in the department of radiology and explore more suitable and effective medical educative strategies.

Objective:To explore the influencing factors of postoperative graft stenosis in patients undergoing left internal mammary artery-left anterior descending branch (LIMA-LAD) coronary artery bypass graft (CABG) surgery.Methods:A retrospective analysis of the clinical data of 86 patients who were admitted to the Second Affiliated Hospital of Hainan Medical College and received coronary angiography after CABG surgery from July 2019 to December 2020 due to recurrent chest tightness, chest pain and other symptoms. According to the degree of stenosis of the LIMA-LAD graft, the patients were divided into stenosis group ( n=25) and non-stenosis group ( n=61). The graft stenosis of patients in the stenosis group was ≥50%, and the graft stenosis of patients in the non-stenotic group was less than 50%. The general information, past medical history, CABG intraoperative data, current visit data and biochemical indicators of the two groups were compared. Measurement data were expressed as mean±standard deviation ( Mean± SD), comparison between groups was by t-test; count data comparison between groups was by Chi-square test. Logistic regression analysis was used to screen out the influencing factors of graft stenosis after CABG. Use the rms package in the R 4.0.2 software to build a nomogram prediction model. Using receiver operating characteristic (ROC) curve to evaluate the discriminative degree of the model. Use the calibration curve and deviation correction C-index to evaluate the nomogram prediction model. Use X-tile software to obtain the cutoff value of the nomogram model integral, use Kaplan-Meier method to draw the survival curve, and use Log-rank to test. Results:Logistic regression analysis showed that smoking, hypertension, pre-CABG left anterior descending branch (LAD) stenosis <75%, pre-CABG left internal mammary artery (LIMA) blood flow, and coronary angiography diffuse lesions are independent risk factors that affect LIMA-LAD graft stenosis after CABG ( P<0.05). The C-index value predicted by the nomogram model was 0.879 (95% CI: 0.818-0.955, P<0.001). The area under the ROC curve was 0.712 (95% CI: 0.594-0.801, P<0.001), with good discrimination. The calibration curve shows that the accuracy of the model prediction was good. Through the X-tile software screening to obtain the model score cutoff value, the patients were divided into low-risk group (≤54 points), medium-risk group (>54 points and ≤112 points), and high-risk group (>112 points). The results of survival analysis showed that the incidence of postoperative graft stenosis in the three groups was 20.9%, 50.0% and 80.0%, respectively. Conclusions:Smoking, hypertension, LAD stenosis before CABG <75%, LIMA blood flow before CABG, and coronary angiography diffuse lessions are independent risk factors that affect LIMA-LAD graft stenosis after CABG. The construction of a nomogram prediction model can provide a reference for evaluating the patency of the LIMA-LAD graft vessel before CABG operation, and reduce the probability of LIMA-LAD graft vessel stenosis after CABG operation.

Objective:To explore the clinical effect of the simultaneous innervated "Bi-system bone flap" on preventing postoperative spontaneous resorption of the bone grafts and recovering lip sensation after reconstructing mandibular defects.Methods:Patients with segmental mandibular defects from the Department of Oral and Maxillofacial Head and Neck Oncology, Shanghai Ninth People’s Hospital were prospectively selected. Following the screening, they were randomly divided into an innervated group and a control group according to the random number table. When the free vascularized iliac bone flap was used to repair the mandibular defect, the ilioinguinal nerve was chosen to innervate a composite tissue flap containing one pedicle (deep circumflex iliac artery), double islands (an internal oblique muscle flap and an iliac bone flap) and one nerve (ilioinguinal nerve). We anastomosed the ilioinguinal nerve with the inferior alveolar nerve and the mental nerve in the innervated group. In the control group, no nerve was involved in the composite tissue flap which contained one pedicle (deep circumflex iliac artery) and double islands (internal oblique muscle flap and iliac bone flap). CT value(Hu) decrease rate, width and height of iliac bone flap 6 months after the operation were used to evaluate the postoperative resorption. The algesia examination, two-point discrimination test and current perception threshold (CPT) test of sensory nerves were used to evaluate the recovery of the lower lip sensation. P value less than 0.05 in independent-samples t test meant the statistically significant difference. Results:Eight patients between 17-38 years old were included with an averaged age of 29.5 years, and the range of mandibular defects was 5-9 cm. There were 4 cases in the innervated group and 4 cases in the control group. All the iliac bone flaps survived. The appearance was satisfactory, and no severe complications were found in the donor and recipient sites. In six-month follow-up, the CT value decrease rate of the bone grafts was (3.13±1.21)% in the innervated group, less than that (20.32±5.23)% in the control group, and the difference was statistically significant ( t=-6.401, P=0.006). Few changes of width and height of the bone grafts were found 6 months after surgery in both groups, and the difference was not statistically significant ( P>0.05). The sensation of the lower lip in the operation area was recovered in the innervated group to some extent, and no obvious pain was showed in the control group. In the two-point discrimination test, it was more than 20 mm in the affected side of the control group, while it was less than 20mm in the innervated group. In the healthy side of the two groups, it was less than 14 mm. The results of the quantitative sensory examination in affected lower lip by CPT test showed that two cases in the innervated group were mild sensory dysfunction, one slight sensory dysfunction and one moderate sensory dysfunction, while all cases in the innervated group were severe sensory dysfunction. The sensory dysfunction of the healthy side was milder than that of the affected side. Conclusions:The innervated "Bi-system" DCIA flap can prevent postoperative osteoporosis of the bone grafts and recover the sensation of the lower lip following mandibular reconstruction, improving the quality of mandibular defect reconstruction.

Objective:To explore the clinical effect of the simultaneous innervated "Bi-system bone flap" on preventing postoperative spontaneous resorption of the bone grafts and recovering lip sensation after reconstructing mandibular defects.Methods:Patients with segmental mandibular defects from the Department of Oral and Maxillofacial Head and Neck Oncology, Shanghai Ninth People’s Hospital were prospectively selected. Following the screening, they were randomly divided into an innervated group and a control group according to the random number table. When the free vascularized iliac bone flap was used to repair the mandibular defect, the ilioinguinal nerve was chosen to innervate a composite tissue flap containing one pedicle (deep circumflex iliac artery), double islands (an internal oblique muscle flap and an iliac bone flap) and one nerve (ilioinguinal nerve). We anastomosed the ilioinguinal nerve with the inferior alveolar nerve and the mental nerve in the innervated group. In the control group, no nerve was involved in the composite tissue flap which contained one pedicle (deep circumflex iliac artery) and double islands (internal oblique muscle flap and iliac bone flap). CT value(Hu) decrease rate, width and height of iliac bone flap 6 months after the operation were used to evaluate the postoperative resorption. The algesia examination, two-point discrimination test and current perception threshold (CPT) test of sensory nerves were used to evaluate the recovery of the lower lip sensation. P value less than 0.05 in independent-samples t test meant the statistically significant difference. Results:Eight patients between 17-38 years old were included with an averaged age of 29.5 years, and the range of mandibular defects was 5-9 cm. There were 4 cases in the innervated group and 4 cases in the control group. All the iliac bone flaps survived. The appearance was satisfactory, and no severe complications were found in the donor and recipient sites. In six-month follow-up, the CT value decrease rate of the bone grafts was (3.13±1.21)% in the innervated group, less than that (20.32±5.23)% in the control group, and the difference was statistically significant ( t=-6.401, P=0.006). Few changes of width and height of the bone grafts were found 6 months after surgery in both groups, and the difference was not statistically significant ( P>0.05). The sensation of the lower lip in the operation area was recovered in the innervated group to some extent, and no obvious pain was showed in the control group. In the two-point discrimination test, it was more than 20 mm in the affected side of the control group, while it was less than 20mm in the innervated group. In the healthy side of the two groups, it was less than 14 mm. The results of the quantitative sensory examination in affected lower lip by CPT test showed that two cases in the innervated group were mild sensory dysfunction, one slight sensory dysfunction and one moderate sensory dysfunction, while all cases in the innervated group were severe sensory dysfunction. The sensory dysfunction of the healthy side was milder than that of the affected side. Conclusions:The innervated "Bi-system" DCIA flap can prevent postoperative osteoporosis of the bone grafts and recover the sensation of the lower lip following mandibular reconstruction, improving the quality of mandibular defect reconstruction.

Since December 2019, an outbreak of novel coronavirus pneumonia (COVID-19) in Wuhan, Hubei Province, which has caused wide public concern all through the world. Although artificial intelligence is a priority development fields in recent years, there is no study on the application and effect of AI in this epidemic. Based on the application of AI scenarios in typical cases, the research analyzes the practice and effectiveness of AI in epidemic surveillance, clinical diagnose, public health management and other related scientific research. Besides, combined with the current situation of development, some suggestions are put forward in order to better play the role of artificial intelligence in the public health emergency system in China.