OBJECTIVE To establish the fingerprint of Gerbera delavayi and the methods for the content determination of 11 components in G. delavayi. METHODS High-performance liquid chromatography（HPLC）was adopted to establish the fingerprints of 13 batches of G. delavayi（No. S1-S13）， and the similarities were evaluated according to Similarity Evaluation System of Chromatographic Fingerprint of TCM （2012 edition）， while the common peaks were identified. Hierarchical clustering analysis （HCA）， principal component analysis （PCA） and orthogonal partial least square-discriminant analysis （OPLS-DA） were carried out by using SPSS 25.0 software and SIMCA 14.1 software. The contents of neochlorogenic acid， chlorogenic acid， cryptochlorogenic acid， 3，8-dihydroxy-4-methoxy-2-oxo-2H-1-benzopyran-5-carboxylic acid， caffeic acid， 3-hydroxy-4-methoxy-2- oxo-2H-1-benzopyran- 5-carboxylic acid， luteolin-7-O-β-D-glucoside， isochlorogenic acid A， apigenin-7-O-β-D-glucoside， isochlorogenic acid C and xanthotoxin were determined by HPLC. RESULTS The similarities in HPLC fingerprint of 13 batches of G. delavayi were 0.801-0.994； a total of 38 common peaks were identified and 13 common peaks were identified. The results of HCA showed that S1-S5 and S7 were clustered into one group， S6 into one category， S8 into one category， S9 and S11 into one category， S10， S12 and S13 into one category， and the results of PCA were consistent with them. The results of OPLS-DA showed that variable importance values for the projection of peak 7 （chlorogenic acid）， peak 21 （isochlorogenic acid A）， peak 26 （xanthotoxin）， peak 19 （isochlorogenic acid B）， peak 33， peak 13， peak 23 （isochlorogenic acid C）， peak 2 （new chlorogenic acid）， peak 17 （luteolin-7-O-β-D- glucoside） were greater than 1. The above 11 components had good linearity in their respective detection concentration ranges （r was greater than 0.999）. RSDs of precision， repeatability， and stability tests were not more than 2% （n＝6）. The average recovery rates were 92.54%-105.55%， and the RSDs were 0.83%-1.93% （n＝6）. The average contents of 11 components were 0.744， 5.014， 0.646， 0.431， 0.069， 0.582， 0.979， 2.754， 0.157， 1.284 and 2.943 mg/g， respectively. CONCLUSIONS The constructed HPLC fingerprint and content determination methods are simple， accurate and stable， which can provide reference for quality control of G. delavayi. Xanthotoxin， chlorogenic acid， isochlorogenic acid A， luteolin-7-O- β -D-glucoside， isochlorogenic acid C and new chlorogenic acid can be used as markers for G. delavayi.

Objective:To retrospectively analyze and summarize the clinical experience and therapeutic effect of anterograde Needle-perc combined with RIRS, namely N+ R (Needle perc + RIRS) technique in the treatment of complex calyceal diverticular stone.Methods:Retrospective analysis of 23 cases of complex renal caliceal diverticulum stones admitted to our hospital from January 2020 to December 2022. The complex factors mainly include the invisible cervical orifice of diverticulum, large stone volume, and special anatomical location, which makes single RIRS or PCNL treatment difficult or unsuccessful. There were 14 males and 9 females with an average age of (42.3±6.1) years. Three cases were upper calyceal diverticular stone, average size was (0.9±0.2)cm. Nine patients had diverticular stone in the middle posterior calyx, and the average size was (1.2±0.3)cm. The average size of four diverticular stone was (1.8±0.2)cm in the anterior middle calyx. Seven patients had diverticular stone with an average size of (1.3±0.1)cm in lower calyx. Among them, 12 patients underwent RIRS which were difficult or stone undiscovered, and 3 patients underwent PCNL and the operation was terminated due to failure of channel establishment. In our center, oblique supine lithotomy position (male) or prone split-leg position (female) was adopted, and the combined treatment of Needle-perc and RIRS was performed. Needle-perc puncture was completed under the guidance of full ultrasound. During the operation, methylene blue reagent or mutual guidance of two endoscopes was used to find the diverticulum neck and expand the outlet with holmium laser incision. Depending on the size and location of the stones, a single Needle-perc laser lithotripsy combined with stone removal in flexible ureteroscope was used, or dual lasers were be used simultaneously for stone removal under double endoscopes. The first stage stone free rate, operation time, hemoglobin decrease, complications, postoperative hospital stay and other conditions were analyzed.Results:All the 23 operations were completed successfully. The stone free rate within 48 hours and one month after surgery was 78.2% and 100.0% respectively. The average operation time was (61.5±12.2)min. The mean postoperative hospital stay was (2.8±0.6) days. The mean decrease of hemoglobin was (3.6±0.4)g/L. Three patients had fever and one patient had renal subcapsular effusion. After anti-inflammatory and symptomatic treatment, the patient was discharged. There was no incidence of Clavien-Dindo≥Ⅱcomplications such as blood transfusion, abdominal organ injury or urosepsis.Conclusions:Treatment of complex renal caliceal diverticulum stones using N+ R technique of anterograde needle-perc combined with RIRS can effectively improve the success rate of first-stage surgery. Overall, it is safe, efficient and feasible with the advantages of high stone free rate, lower damage, and few postoperative complications.

Objective To observe the feasibility of cardiac MR tissue tracking(CMR-TT)technique for quantitatively evaluating myocardial strain of patients with myocardial amyloidosis(CA).Methods Cardiac MRI were collected from 20 patients of immunoglobulin amyloid light-chain CA(AL-CA,group A),20 cases of transthyretin CA(ATTR-CA,group B)and 20 healthy subjects(group C),and myocardial strain parameters were obtained using CMR-TT technique.Left ventricular cardiac function parameters were compared among 3 groups,so were strain parameters of each myocardial segment of left ventricle and global myocardium,including 3D longitudinal strain(LS),3D radial strain(RS)and 3D circumferential strain(CS).Results Compared with those in group C,significant differences of left ventricular cardiac function parameters were found in both group A and B(all P＜0.01),while no statistical difference was found between group A and B(all P＞0.05).Except for apical segment RS(P=0.81),strain parameters in group A and B were both lower than those in group C(all P＜0.01),while no significant difference was detected between group A and B(all P＞0.05).Conclusion CMR-TT technique could be used to quantitatively evaluate left ventricular myocardial strain of CA patients.

Objective:To investigate the diagnostic performance of continuous-time random-walk (CTRW) diffusion model combined with vesical imaging-reporting and data system (VI-RADS) in the diagnosis of muscle invasion of bladder cancer.Methods:In this case-control study, 64 patients with pathologically confirmed bladder urothelial carcinoma in Peking University First Hospital were retrospectively enrolled from August 2022 to March 2023. The patients were divided into the muscle invasive bladder cancer (MIBC) group and the nonmuscle invasive bladder cancer (NMIBC) group (29 cases and 35 cases, respectively) according to the pathological results. All patients underwent bladder MRI within 4 weeks before surgery, including T 2WI, conventional diffusion weighted imaging (DWI), and multi-b-value DWI. The CTRW model was used to obtain three quantitative diffusion parameters, including D m (an anomalous diffusion coefficient), α (related to temporal diffusion heterogeneity), and β (related to spatial diffusion heterogeneity). The apparent diffusion coefficient (ADC) was calculated using a mono-exponential model. The VI-RADS scores were evaluated based on T 2WI and conventional DWI. The Mann-Whitney U test was used to compare the diffusion parameters between the MIBC group and the NMIBC group. The combination of the parameters was investigated with logistic regression analysis. The diagnostic performance for muscle invasion of bladder cancer was evaluated by receiver operating characteristic analysis and the area under the curve (AUC). The difference between AUC was compared using the DeLong test. Results:There were statistically significant differences in ADC, D m, and α between the MIBC group and the NMIBC group ( Z=-2.31, -2.91, -3.97, P=0.021, 0.004,<0.001). No significant difference was found in β between the two groups ( Z=1.69, P=0.091). The AUC (95% CI) of D m and α for diagnosing MIBC were 0.712 (0.587-0.838) and 0.790 (0.676-0.904) respectively, both of which were higher than that of ADC (AUC 0.669, 95% CI 0.537-0.801) with statistically significant differences ( Z=2.86, 2.27, P=0.004, 0.023). The AUC (95% CI) of CTRW (D m+α) was 0.782 (0.661-0.876), which was significantly higher than that of ADC ( Z=2.35, P=0.019). The AUC (95% CI) of VI-RADS score and VI-RADS combined with CTRW parameter (VI-RADS+D m+α) were 0.823 (0.716-0.930) and 0.900 (0.799-0.961) respectively, with a statistically significant difference between them ( Z=2.16, P=0.031). Conclusion:The D m and α parameters in the CTRW diffusion model show better performance than the ADC in the mono-exponential model for muscle-invasive evaluation of bladder cancer, and the CTRW diffusion model can enhance the diagnostic performance of VI-RADS.

A 56-year male patient was implanted with a third generation magnetic levitation HeartCon left ventricular assist device (LVAD) for refractory heart failure through a left antero-lateral thoracotomy. Inflow cannula of the HeartCon blood pump was inserted via the left apex and outflow tract with the artificial blood vessel was sutured to the descending aorta. The operation process was smooth, the LVAD worked stably, and results of left ventricular assist was good. Implantation of HeartCon LVAD through the left antero-lateral thoracotomy is an alternative technique with less surgical complications, less trauma and satisfactory results.

Specific pathogen-free(SPF)chickens are widely used in the research of avian diseases and vaccines.Vertically transmissible diseases are transmitted to chickens through vertical transmission,seriously affecting their survival rate,increasing production costs,and causing significant economic losses to the poultry industry,while severely impacting the breeding and use of SPF chickens.Therefore,it is crucial for researchers and managers to enhance their understanding of vertically transmissible pathogens in chickens and to develop effective monitoring measures.Quality monitoring is an important part of ensuring the quality of SPF chickens,with pathogen detection being the primary step.Based on this,it is necessary to cultivate qualified SPF chickens through purification methods and biosecurity measures.This paper reviews the major vertically transmissible pathogens in chickens,including viral pathogens,bacterial pathogens and mycoplasmas,as well as their detection methods.This study compares the differences in microbiological testing items and methods for SPF chickens between the U.S.corporate standard and the Chinese national standard.Analysis of the results shows that in both standards,vertically transmissible pathogens such as Escherichia coli,Proteus mirabilis,Salmonella,and avian leukosis are not included in the microbiological testing items for SPF chickens.Instead,these pathogens are characterized by mixed infections,and outbreaks can seriously affect flock health.To produce higher-quality SPF chickens,it is necessary to include these pathogens in the mandatory testing items.The aim of this paper is to help readers understand the relevant standards for microbiological monitoring of SPF chickens,the hazards of vertically transmissible pathogens,and prevention and control strategies,so as to provide a reference for the detection and purification of pathogens in SPF chickens.

Objective To evaluate the application value of artificial intelligence mixed reality(AI-MR)technology in the planning of ultrasound-guided percutaneous nephrolithotomy(PCNL)for special types of complex upper urinary stones.Methods The prospective single-center,single-arm clinical study involved 15 patients with complex upper urinary stones undergoing ultrasound-guided PCNL during Aug.2022 and May 2023,including 9 male and 6 female,3 cases of pelvic ectopic kidney stones,5 cases of horseshoe kidney stones,3 cases of renal stones combined with spinal deformity,and 4 cases of transplant kidney stones.Based on preoperative computed tomography urography(CTU)data,digital three-dimensional reconstruction was performed,and AI-MR was used to project surgery-related three-dimensional images in real space to obtain"perspective"information of the surgical area.This facilitated preoperative design and planning,including target calyx,number of channels,and auxiliary measures.The compliance of target calyx and number of channels,stone clearance rate,total operation time,time required to establish the percutaneous renal channel,decrease in hemoglobin level,surgical complications,and postoperative hospital stay were analyzed.Results All 15 patients underwent preoperative planning using AI-MR and successfully completed one-stage ultrasound-guided PCNL.Based on the preoperative planning,we utilized S-PCNL alone or combined with Needle-perc or antegrade/retrograde FURS/RIRS.Among all patients,4 underwent single-channel S-PCNL,3 multi-channel S-PCNL,and 8 S-PCNL combined with Needle-perc or FURS.The compliance of target calyx and number of channels was 86.7％,the one-stage stone clearance rate was 80.0％,the average time for establishing the channel was(2.3±0.3)minutes,the average total operation time was(61.5±12.2)minutes,the mean decrease in hemoglobin level was(9.6±1.2)g/L,and the average postoperative hospital stay was(4.6±0.5)days.There were no Clavien-Dindo grade ≥ Ⅱ complications,such as blood transfusion,organ injury,or urosepsis.Conclusion Before surgery,AI-MR can be used to quantitatively analyze imaging data for patients with special types of complex upper urinary stones,which can achieve three-dimensional fluoroscopy effects,formulate surgical plans,optimize puncture paths,effectively avoid the risk of damage to surrounding organs,reduce complications,shorten treatment cycle and improve the first-stage stone clearance rate.

Objective To investigate the incidence and related factors of contrast media extravasation during CT and MR enhanced examinations.Methods A retrospective collection of 234 728 consecutive patients who underwent CT and MR enhanced examina-tions.Firstly,the patients with contrast media extravasation were divided into female group and male group according to gender for comparison.Further,the two groups were subdivided into＜50 years old subgroup and≥50years old subgroup according to age for inter-subgroup comparison.Results Among 234 728 patients in this study,258(0.11％)developed contrast media extravasation.Among them,the female group accounted for 62.02％of contrast media extravasation,while the male group accounted for 37.98％.The incidence of contrast media extravasation in the female group(0.15％)was significantly higher than that in the male group(0.08％),and the difference was statistically significant(P＜0.001).Further inter-subgroup analysis revealed that the incidence of contrast media extravasation in the female patients age ≥50 years old subgroup(0.18％)was significantly higher than that in the female patients age＜50 years old subgroup(0.07％),with statistical significance(P＜0.001).The incidence of contrast media extravasation in the female patients age ≥50 years old subgroup(0.18％)was significantly higher than that in the male patients age ≥50 years old subgroup(0.07％),and the difference was statistically significant(P＜0.001).However,there was no statistically significant difference in the incidence of contrast media extravasation between the male＜50 years old and ≥50 years old subgroups(P=0.23).Conclusion The incidence of contrast media extravasation is higher in female patients age≥50 years old.

Objective:To evaluate the performance of machine learning (ML) based on automated breast volume scanner (ABVS) radiomics in distinguishing benign and malignant BI-RADS 4 lesions.Methods:Between May to December 2020, patients with BI-RADS 4 lesions from the Affiliated Hospital of Southwest Medical University (Center 1) and Guangdong Provincial Hospital of Traditional Chinese Medicine (Center 2) were prospectively collected and divided into training cohort (Center 1) and external validation cohort (Center 2). The radiomics features of BI-RADS 4 lesions were extracted from the axial, sagittal and coronal ABVS images by MaZda software. In the training cohort, 7 feature selection methods and thirteen ML algorithms were combined in pairs to construct different ML models, and the 6 models with the best performance were verified in the external validation cohort to determine the final ML model. Finally, the diagnostic performance and confidence (5-point scale) of radiologists (R1, R2 and R3, with 3, 6 and 10 years of experience, respectively) with or without the model were evaluated.Results:①A total of 251 BI-RADS 4 lesions were enrolled, including 178 lesions (91 benign, 87 malignant) in the training cohort and 73 lesions (44 benign, 29 malignant) in the external validation cases. ②In the training cohort, the 6 ML models (DNN-RFE, AdaBoost-RFE, LR-RFE, LDA-RFE, Bagging-RFE and SVM-RFE) had the best diagnostic performance, and their AUCs were 0.972, 0.969, 0.968, 0.968, 0.967 and 0.962, respectively. ③In the external validation cohort, the DNN-RFE still had the best performance with the AUC, accuracy, sensitivity, specificity, PPV and NPV were 0.886, 0.836, 0.934, 0.776, 86.8% and 82.5%, respectively. ④Before model assistance, R1 had the worst diagnostic performance with the accuracy, sensitivity, specificity, PPV and NPV were 0.680, 0.750, 0.640, 57% and 81%, respectively. After model assistance, the diagnostic performance of R1 was significantly improved ( P=0.039), and its diagnostic sensitivity, specificity, accuracy, PPV and NPV improved to 0.730, 0.810, 0.930, 68% and 94%; while the improvement of R2 and R3 were not significantly ( P=0.811, 0.752). Meanwhile, the overall diagnostic confidence of the 3 radiologists increased from 2.8 to 3.3 ( P<0.001). Conclusions:The performance of ML based on ABVS radiomics in distinguishing between benign and malignant BI-RADS 4 lesions is good, which may improve the diagnostic performance of inexperienced radiologists and enhance diagnostic confidence.

Objective To analyze the changes of postoperative pulmonary function in lung transplant recipients. Methods Clinical data of 81 recipients undergoing bilateral lung transplantation and combined heart-lung transplantation were collected, and postoperative status of the recipients was analyzed. Pulmonary ventilation and diffusion function indexes at 1 month, 3 months, every 3 months (3-18 months after lung transplantation) and every 6 months (18-36 months after lung transplantation) were analyzed in the recipients. The characteristics of the optimal pulmonary function in the recipients were assessed. Results Postoperative mechanical ventilation time was 4 (2, 9) d, and the length of postoperative ICU stay was 10 (7, 20) d. Among 81 recipients, 27 recipients developed primary graft dysfunction (PGD) after lung transplantation, with an incidence rate of 33%. Postoperative forced vital capacity (FVC) to predicted value ratio (FVC%pred), forced expiratory volume in one second (FEV₁) to predicted value ratio (FEV₁%pred), FEV₁/FVC to predicted value ratio (FEV₁/FVC%pred) and corrected diffusion lung capacity for CO to predicted value ratio (D_LCOc%pred) were changed over time (all P<0.001). FVC%pred and FEV₁%pred were gradually increased within postoperative 9 months, and D_LCOc%pred was gradually elevated within postoperative 3 months (all P<0.05). Thirty-six recipients had FVC%pred≥80%, FEV₁%pred≥80% in 41 cases, FEV₁/FVC%pred≥92% in 76 cases, FVC%pred≤40% in 1 case and FEV₁%pred≤40% in 1 case, respectively. Sixteen recipients had D_LCOc%pred≥80%, corrected diffusion lung capacity for CO/alveolar volume to predicted value ratio (D_LCOc/V_A%pred) ≥80% in 63 cases, D_LCOc%pred≤40% in 4 cases and D_LCOc/V_A%pred≤40% in 1 case, respectively. Postoperative FVC%pred, FEV₁/FVC%pred and D_LCOc%pred in recipients with a primary disease of obstructive pulmonary disease were significantly higher than those in their counterparts with restrictive pulmonary disease (all P<0.05). Postoperative D_LCOc%pred in recipients with PGD was significantly lower than that in those without PGD (P<0.05). Conclusions Pulmonary ventilation function in lung transplant recipients reaches the optimal state and maintains a steady state at postoperative 9 months, and pulmonary diffusion function reaches a steady state at postoperative 3 months. Primary diseases and the incidence of PGD may affect postoperative pulmonary function.