BACKGROUND:Multiple observational studies have suggested a potential association between telomere length and musculoskeletal diseases.However,the underlying mechanisms remain unclear. OBJECTIVE:To investigate the genetic causal relationship between telomere length and musculoskeletal diseases using two-sample Mendelian randomization analysis. METHODS:Genome-wide association study summary data of telomere length were obtained from the UK Biobank.Genome-wide association study summary data of 10 common musculoskeletal diseases(osteonecrosis,osteomyelitis,osteoporosis,rheumatoid arthritis,low back pain,spinal stenosis,gout,scapulohumeral periarthritis,ankylosing spondylitis and deep venous thrombosis of lower limbs)were obtained from the FinnGen consortium.Inverse variance weighting,Mendelian randomization-Egger and weighted median methods were used to evaluate the causal relationship between telomere length and 10 musculoskeletal diseases.Inverse variance weighting was the primary Mendelian randomization analysis method,and sensitivity analysis was performed to explore the robustness of the results. RESULTS AND CONCLUSION:(1)Inverse variance-weighted results indicated a negative causal relationship between genetically predicted telomere length and rheumatoid arthritis(odds ratio=0.78,95%confidence interval:0.64-0.95,P=0.015)and osteonecrosis(odds ratio=0.56,95%confidence interval:0.36-0.90,P=0.016).No causal relationship was found between telomere length and the other eight musculoskeletal diseases(all P>0.05).(2)Sensitivity analysis affirmed the robustness of these causal relationships,and Mendelian randomization-Egger intercept analysis found no evidence of potential horizontal pleiotropy(all P>0.05).(3)This Mendelian randomized study supports that telomere length has protective effects against rheumatoid arthritis and osteonecrosis.However,more basic and clinical research will be needed to support our findings in the future.

Objective:To investigate the clinical effect of the modified vertical rectus abdominis myocutaneous flap in repairing the skin and soft tissue defect after abdominoperineal resection for rectal cancer.Methods:This study was a retrospective observational study. From June 2019 to July 2022, five male patients with low rectal cancer who were conformed to the inclusion criteria were admitted to the Department of Basic Surgery of Xiangya Hospital of Central South University, with ages ranging from 65 to 70 years and the sizes of the perianal skin ulcers ranging from 5 cm×4 cm to 11 cm×9 cm, and all of them underwent abdominoperineal resection. The secondary skin and soft tissue defects in the perineum with an area of 8 cm×6 cm-14 cm×12 cm (with the depth of pelvic floor dead space being 10-15 cm) were repaired intraoperatively with transplantation of modified vertical rectus abdominis myocutaneous flaps with the skin area being 9 cm×7 cm-16 cm×12 cm, the volume of the muscle being 18 cm×10 cm×5 cm-20 cm×12 cm×5 cm, and the vessel pedicle being 18-20 cm in length. During the operation, most of the anterior sheath of the rectus abdominis muscle was retained, the flap was transferred to the recipient area through the abdominal cavity, the remaining anterior sheaths of the rectus abdominis muscle on both sides of the donor area were repeatedly folded and sutured, the free edge of the transverse fascia of the abdomen was sutured with the anterior sheath of the rectus abdominis muscle, and the donor area skin was directly sutured. After the operation, the survival of the transplanted myocutaneous flap was observed. The occurrence of complications in the perineal recipient area was recorded within 2 weeks after the operation. The recovery of the perineal recipient area and the abdominal donor area was observed during follow-up, and the occurrence of complications in the donor area of the abdomen as well as the recurrence of tumors and metastasis were recorded.Results:All transplanted myocutaneous flaps in 5 patients survived after surgery. One patient had dehiscence of the incision in the perineal recipient area 2 days after surgery, which healed after 7 d with intermittent dressing changes and routine vacuum sealing drainage treatment. In the other 4 patients, no complications such as incisional rupture, incisional infection, or fat liquefaction occurred in the perineal recipient area within 2 weeks after surgery. Follow-up for 6-12 months after discharge showed that the skin of the perineal recipient area had good color, texture, and elasticity, and was not bloated in appearance; linear scars were left in the perineal recipient area and the abdominal donor area without obvious scar hyperplasia or hyperpigmentation; no complications such as incisional rupture, incisional infection, intestinal adhesion, intestinal obstruction, or weakening of the abdominal wall strength occurred in the abdominal donor area, and the abdominal appearance was good with no localized bulge or formation of abdominal hernia; there was no local recurrence of tumor or metastasis in any patient.Conclusions:The surgical approach of using the modified vertical rectus abdominis myocutaneous flap to repair the skin and soft tissue defects after abdominoperineal resection for rectal cancer is relatively simple in operation, can achieve good postoperative appearances of the donor and recipient areas with few complications, and is worthy of clinical promotion.

Objective:To evaluate the diagnostic value of targeted biopsy of secondary lesion (SL) in systematic biopsy (SB) combined targeted biopsy for clinically significant prostate cancer (CsPCa).Methods:A retrospective analysis was conducted on the data of patients who underwent systematic biopsy combined target biopsy at Nanjing Drum Tower Hospital from January 2021 to February 2023, and they had at least two Prostate Imaging-Reporting and Data System (PI-RADS) score ≥3 lesions on prostate magnetic resonance imaging. The study included patients with a median age of 70 (65, 76) years old, median prostate specific antigen (PSA) was 9.1 (5.96, 13.62) ng/ml, median prostate volume was 39.1 (29.27, 53.25) ml, and median PSAD was 0.2 (0.15, 0.38) ng/ml 2.The index lesion (IL) was defined as the one with the highest PI-RADS score and SL was defined as the one with the second-highest PI-RADS score. If the two lesions had the same PI-RADS score, the one with larger maximum diameter was IL and the other one was SL. The median maximum diameter of IL and SL were 1.3 (1.06, 1.66) cm and 0.9 (0.69, 1.20) cm, respectively. The median maximum diameter ratio of IL and SL was 1.48 (1.10, 1.91), and the median maximum diameter difference of IL and SL was 0.9 (0.20, 1.89) cm. The IL in peripheral zone was found in 238 patients (62.63%) and SL in peripheral zone was found in 255 patients (67.10%). There were 204 patients (53.68%) having both IL and SL on the same side of prostate. According to the combination of PI-RADS scores of IL and SL, patients were categorized into various groups: 96 patients (25.26%) with IL3 and SL3, 79 (20.78%) with IL4 and SL3, 98 (25.78%) with IL4 and SL4, 21 (5.52%) with IL5 and SL3, 76 (20.0%) with IL5 and SL4, and 10 (2.63%) with IL5 and SL5. Targeted biopsy was performed on at least two of the most significant lesions. Comparison was performed in the detection rate of CsPCa between SB+ IL+ SL and SB+ IL (SL was omitted). To explore the factors influencing the detection rate of CsPCa, a multivariate logistic regression analysis was used. Results:The detection rate of CsPCa in this study was 78.95% (300/380) based on SB+ IL+ SL. After omitting SL target biopsy, the detection rate of CsPCa was 78.16% (297/380, P>0.05) under the condition of SB+ IL. No significant differences were noted between the two groups. The multivariate logistic regression analysis showed that PSA ( OR=1.11, 95% CI 1.05-1.20, P<0.01), prostate volume ( OR=0.98, 95% CI 0.96-0.99, P<0.01), SL maximum diameter ( OR=0.19, 95% CI 0.08-0.50, P<0.01), ratio of IL and SL maximum diameter ( OR=0.34, 95% CI 0.16-0.68, P<0.01), difference of IL and SL maximum diameter ( OR=1.50, 95% CI 1.10-2.29, P<0.05), and PI-RADS score group of IL and SL (IL3 vs. SL3 as the reference, IL4 vs. SL3 OR=4.79, 95% CI 2.21-10.91, P<0.01, IL4 vs. SL4 OR=23.11 95% CI 8.09-85.28, P<0.01, IL5 vs. SL3/4/5 OR=15.28 95% CI 5.21-48.55, P<0.01) were the influencing factors for detection rate of CsPCa. Conclusions:For patients with at least two PI-RADS score≥3 lesions on prostate magnetic resonance imaging, omitting SL can almost maintain the same detection efficacy.

Objective:To explore the methylation degree of miRNA-4729 (miR-4729) in renal cancer tissues and its impact on the proliferation and migration abilities of renal cancer cell lines.Methods:Data from the SurvivalMeth database (updated in October 2022) was used to analyze the methylation degree of miR-4729 in 178 renal cancer tissues. Target gene with complementary binding sites to miR-4729 was predicted by miRNApath software. The normal renal tubular epithelial cell line HK-2 and the renal cancer cell lines Caki-1, A-498, ACHN, and 786-O were selected. Real-time fluorescence quantitative polymerase chain reaction (qRT-PCR) was used to detect the relative expression of miR-4729 in each cell line and the effect of methylation inhibitor 5-aza-2'-deoxycytidine (5-Aza-CdR) on the expression of miR-4729 in renal cancer cells. A-498 cells with the lowest relative expression of miR-4729 were transfected with miR-4729 mimic (miR-4729 group) and miRNA-NC (NC group), and colony formation assay and scratch assay were used to detect the effect of overexpression of miR-4729 on the proliferation and migration abilities of A-498 cells. Dual-luciferase reporter gene assay was used to verify the targeting relationship between miR-4729 and DEAD box peptide 5 (DDX5). Western blotting was used to detect the effect of miR-4729 overexpression on the expression of DDX5 protein and AKT signaling pathway-related proteins (p-AKT, p-IKKα, p-Tpl2 and AS160) in A-498 cells.Results:The analysis results of data from the SurvivalMeth database showed that the methylation degree of miR-4729 in renal cancer tissues was higher than that in paracancerous tissues ( P < 0.01). The relative expressions of miR-4729 in renal cancer Caki-1, A-498, ACHN, 786-O cells and normal renal tubular epithelial HK-2 cells were 0.62±0.05, 0.16±0.04, 0.53±0.02, 0.69±0.03, and 0.99±0.07, respectively, and the difference was statistically significant ( F = 47.39, P < 0.01). Compared with various cell groups cultured with dimethyl sulfoxide (DMSO), the relative expressions of miR-4729 in renal cancer Caki-1, A-498, ACHN and 786-O cells cultured with 5-Aza-CdR were higher (all P < 0.01). The results of colony formation assay showed that the number of colonies formed in A-498 cells of the miR-4729 group and NC group were 53±6 and 102±10, respectively, and the difference was statistically significant ( t = 4.25, P < 0.01). The results of scratch assay showed that the scratch healing rates of A-498 cells in the miR-4729 group and NC group were (42.3±2.7)% and (67.6±4.8)%, respectively, and the difference was statistically significant ( t = 4.58, P < 0.01). The results of dual-luciferase reporter gene assay showed that miR-4729 directly targeted and bound to DDX5. The relative expressions of DDX5 mRNA in A-498 cells of the miR-4729 group and NC group were 0.93±0.25 and 5.29±0.74, respectively, and the difference was statistically significant ( t = 5.60, P < 0.01). The results of Western blotting showed that compared with the NC group, the expression of DDX5 protein in A-498 cells of the miR-4729 group was lower, and the expressions of AKT signaling pathway-related proteins p-AKT, p-IKKα, p-Tpl2 and AS160 were also lower. Conclusions:Overexpression of miR-4729 decreases the activation level of AKT signaling pathway by targeting and inhibiting the expression of DDX5 gene, thereby inhibiting the proliferation and migration of renal cancer cells.

Patients with severe trauma require an extremely timely treatment and transfusion plays an irreplaceable role in the emergency treatment of such patients. An increasing number of evidence-based medicinal evidences and clinical practices suggest that patients with severe traumatic bleeding benefit from early transfusion of low-titer group O whole blood or hemostatic resuscitation with red blood cells, plasma and platelet of a balanced ratio. However, the current domestic mode of blood supply cannot fully meet the requirements of timely and effective blood transfusion for emergency treatment of patients with severe trauma in clinical practice. In order to solve the key problems in blood supply and blood transfusion strategies for emergency treatment of severe trauma, Branch of Clinical Transfusion Medicine of Chinese Medical Association, Group for Trauma Emergency Care and Multiple Injuries of Trauma Branch of Chinese Medical Association, Young Scholar Group of Disaster Medicine Branch of Chinese Medical Association organized domestic experts of blood transfusion medicine and trauma treatment to jointly formulate Chinese expert consensus on blood support mode and blood transfusion strategies for emergency treatment of severe trauma patients ( version 2024). Based on the evidence-based medical evidence and Delphi method of expert consultation and voting, 10 recommendations were put forward from two aspects of blood support mode and transfusion strategies, aiming to provide a reference for transfusion resuscitation in the emergency treatment of severe trauma and further improve the success rate of treatment of patients with severe trauma.

Abstract The harm of head injury in skateboarding is more serious. The common injury cause is fall, collision, high speed impact. The primary types of injury include skull fracture, subdural hemorrhage, brain laceration contusion and concussion. Older children and adolescents, males, longboard, inappropriate sports venue are important risk factors for severe traumatic brain injury. Designing special skateboard parks and wearing protective equipment (helmets) can effectively reduce the incidence and severity of head injuries. The occurrence of injury can be reduced by adopting both legislation and education measures.

BACKGROUND:Concussions caused by contact sports or traffic accidents are far more serious and common than people think,and have attracted widespread attention and high attention from the media,medical and sports circles in recent years. OBJECTIVE:To visualize the hot spots and trends in the field of concussion by using the method of bibliometrics,so as to provide some reference for the research in this field in China. METHODS:Based on the core collection database of Web of Science,the keyword retrieval strategy was(TS=(Concussion))AND TS=(Finite element).CiteSpace 6.2.R4 visualization tool was used to visually analyze the author,country,institution,keywords,cited documents,etc. RESULTS AND CONCLUSION:A total of 215 articles were included,with a general upward trend in the number of publications and citations.The distribution of disciplines involves biomedical engineering,biophysics,sports science,clinical neurology,neuroscience and other disciplines,showing a trend of interdisciplinary integration.The author with the most publications is Gilchrist M from University College Dublin,Ireland,the institution with the most publications is the University of Ottawa,and the country with the most publications is the United States.Key word analysis shows that the focus of research is on the establishment of brain injury models to simulate and predict concussion injuries;analysis of concussion injury mechanism;optimal design of protective equipment and devices.Through literature co-citation analysis,it is found that the prediction and evaluation of brain injury is the knowledge base and research hotspot in this field.The research hotspot of finite element application in the field of concussion injury mainly focuses on the prediction of head injury,combined with the exploration of brain injury mechanism and the design and improvement of protective equipment.With the progress of artificial intelligence and materials science,future research hotspots in the field of concussion injury will focus on the improvement of brain injury models,test methods and protective equipment.

OBJECTIVE To investigate the changes in high performance liquid chromatography （HPLC） fingerprint spectra and nucleoside components between Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine and its processed product Succus bambusae pinella preparata， providing a reference for the quality evaluation of the latter. METHODS HPLC fingerprint was established for 10 batches of Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine and its processed product Succus bambusae pinella preparata following the Similarity Evaluation System of TCM Chromatographic Fingerprints （2012 Edition）. Hierarchical cluster analysis （HCA）， principal component analysis （PCA）， and orthogonal partial least squares-discriminant analysis （OPLS- DA） were conducted on their common peaks. The contents of four nucleoside components， hypoxanthine， uridine， adenine， and guanosine， in both Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine and Succus bambusae pinella preparata were determined. RESULTS The similarity between the fingerprints of the 10 batches of Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine， Succus bambusae pinella preparata， and their corresponding reference fingerprints ranged from 0.851 to 0.990. A total of 10 common peaks were obtained for both samples， and 4 components were identified as hypoxanthine， uridine， adenine， and guanosine. The results of HCA， PCA and OPLS-DA showed that the samples of Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine and Succus bambusae pinella preparata were clustered into separate categories， with OPLS-DA selecting 4 differential components between them， ranked by variable importance projection values as peak 8， peak 1， peak 6 （adenine） and peak 10. The content determination results showed that the average contents of hypoxanthine， uridine， adenine and guanosine in Succus bambusae pinella preparata declined by 15.90%， 12.00%， 26.04% and 22.18% compared to Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine， respectively， with statistically significant differences in the contents of hypoxanthine， adenine and guanosine （P＜0.05 or P＜0.01）. CONCLUSIONS The established fingerprint and content determination methods are simple to operate and have good repeatability， which are suitable for qualitative and quantitative analysis of Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine and Succus bambusae pinella preparata. The average contents of the four nucleoside components decreased after the processing of Succus bambusae pinella preparata.

【Objective】 To investigate the condition of confidential unit exclusion(CUE) in Guangzhou, so as to ensure blood safety. 【Methods】 The number of CUE donors, demographic characteristics of CUE donors, reasons for CUE, and response time of CUE after blood donation in Guangzhou from 2009 to 2022 were statistically analyzed. 【Results】 From 2009 to 2022, the response ratios of CUE was 0.006 2% (260/4 170 984) and the ratios had statistically significant difference between different years(P<0.05). For the response ratios of CUE, no statistically significant difference was noticed in gender and occupation (P>0.05), but statistically significant differences were found in age, number of blood donations, education background, and marital status (P<0.05). Blood donors aged 18~30 (0.007 3%, P<0.05) and first-time blood donors (0.010 8%, P<0.05) were the main groups of CUE. High risk sexual behavior (28.46%, 74/260) was the primary reason for CUE. The CUE response peak was within 72 hours after blood donation, and the response ratios within 24-72 hours after blood donation was the highest (68.46%, 178/260). 【Conclusion】 CUE is a crucial measure to ensure blood safety. Detailed pre-donation health consultations are suggested for blood donors aged 18-30 and first-time blood donors so as to better excluding high-risk blood donors. Strengthening the publicity of CUE response and process, registering and classifying the reasons for CUE are also important.

【Objective】 To achieve supervision and management of the whole business process of blood center, raise productivity and ensure blood quality by enabling blood center managers comprehensively grasp the key business operation situation of the whole process at anytime and anywhere. 【Methods】 A whole business process supervision and management system was established covering background of preparation, business scope, content of position supervision and management, overall framework design, interface design of management and supervision management, physical database design, program development and online debugging, and was integrated with the blood bank management information system. The display and management were through a mobile APP to record key indicators of business process from blood collection to blood supply timely and comprehensively. Statistical analysis was conducted on total collection volume, total preparation volume and total supply volume, as well as discarding rate of test unqualified and of non-test unqualified (lipemic blood excluded) in 2023 and 2022. 【Results】 We established a mobile APP based on a blood bank management information system for business supervision and management of whole process, and achieved management by phones. After its implementation in 2023, the total collection volume, total preparation volume and total supply volume in 2023 were all higher than those in 2022, with growth rates of 5.88% (13 247/225 454 U), 4.73% (24 156/510 698 U), and 6.70% (34 814/519 914 U), respectively. The discarding rate in 2023 was lower than that in 2022 (0.54%, 2 868/534 854 U) vs (0.60%, 3 047/510 698 U) (P<0.01), and the non-test unqualified discarding rate (lipemic blood excluded) in 2023 was significantly lower than that in 2022(0.12%, 649/534 854 U) vs (0.19%, 991/510 698 U)(P<0.01). 【Conclusion】 The construction of supervision and management system of a whole business process based on blood bank management information system can meet the standardized service needs of managers at anytime and anywhere, continuously raise productivity and the standardization and scientific level of blood bank management, thus ensuring blood supply.