Objective To quantitatively assess the association of short-term exposure to polycyclic aromatic hydrocarbons (PAHs) in ambient fine particulate matter (PM2.5) with residents mortality. Methods A time-stratified case-crossover study was conducted from 2020 to 2022 among 10606 non-accidental residents by using the Guangzhou Cause of Death Surveillance System in Conghua District, Guangzhou. Exposure levels of PAHs in PM_2.5 and meteorological data during the study period were obtained from the Center for Disease Control and Prevention in Conghua District and the China Meteorological Administration Land Data Assimilation System (CLDAS-V2.0), respectively. Conditional Poisson regression model was used to estimate the exposure-response association between PAHs and the mortality risk. Results Fluoranthene, chrysene, benzo[k]fluoranthene, benzo[a]pyrene, and indeno[1,2,3-cd]pyrene were significantly associated with an increased risk of mortality. For every one interquartile range increase in exposure levels, the non-accidental mortality risks increased by 8.33% (95% CI: 1.80%, 15.27%), 4.67% (95% CI: 1.86%, 7.57%), 6.07% (95% CI: 2.08%, 10.21%), 4.62% (95% CI: 1.85%, 7.47%), and 4.70% (95% CI: 0.53%, 9.03%), respectively. The estimated non accidental deaths attributable to exposure to fluoranthene, chrysene, benzo[k]fluorine, benzo[a]pyrene and indine[1,2,3-cd]pyrene were 5.91%, 6.08%, 6.51%, 6.46%, and 4.21%, respectively. Conclusions Short-term exposure to PAHs in PM_2.5, including fluoranthene, chrysene, benzo[k]fluoranthene, benzo[a]pyrene and indine[1,2,3-cd]pyrene, was significantly associated with an increased risk of mortality among residents.

Objective:To construct an operation efficiency evaluation model of rehabilitation medical equipment based on equipment status information,and to improve the operation efficiency of rehabilitation medical equipment.Methods:The operating efficiency evaluation model of medical equipment in rehabilitation department was constructed based on the state information modeling of medical equipment.A total of 35 medical devices in clinical use in the Rehabilitation Department of Shanxi Bethune Hospital from 2021 to 2023 were selected.During the operation period of the equipment from January 2021 to June 2022,the conventional management mode was adopted,and during the operation period of the equipment from July 2022 to December 2023,the operation efficiency evaluation model of medical equipment in the rehabilitation department based on equipment status information was adopted.The timeliness of equipment management,management index score,equipment failure rate and management recognition score of the two management methods were analyzed and compared.Results:The repair time,maintenance time,automatic fault response time and equipment fault information push time of the medical equipment in the rehabilitation department managed by the efficiency evaluation model were(2.36±1.35)min,(3.36±1.56)d,(4.15±2.34)min and(4.36±1.36)min,respectively,which were all less than those of conventional management,the difference was statistically significant(t=13.294,11.931,15.534,18.829,P＜0.05).The average scores of equipment resource allocation,information support,environmental protection and management performance were(89.14±6.58)points,(90.69±8.45)points,(90.69±4.39)points and(91.01±5.45)points,respectively,which were higher than those of conventional management,the difference was statistically significant(t=13.982,13.246,16.251,16.422,P＜0.05).The failure rates of monitoring equipment,ultrasonic equipment,orthodontic equipment and other rehabilitation equipment were(0.98±0.20)%,(0.99±0.22)%,(0.90±0.18)%and(1.01±0.22)%,respectively,which were lower than those of conventional management,the difference was statistically significant(t=18.627,20.941,19.715,19.505,P＜0.05).The recognition scores of engineering designers,operators and doctors involved in the use and management of medical equipment in the rehabilitation department with the equipment management using the efficiency evaluation model were(89.36±6.39),(91.57±5.36)and(92.36±4.21),respectively,which were higher than those of conventional management,the difference was statistically significant(t=9.119,11.812,13.469,P＜0.05).Conclusion:The operation efficiency evaluation model of medical equipment in rehabilitation department based on equipment status information can effectively improve the accuracy of risk management of equipment in rehabilitation department,reduce the risk coefficient of equipment operation,reduce potential safety risks,and improve the operation quality and efficiency of equipment.

In traditional Chinese medicine， it is believed that the disease of tubal infertility is located in the uterus vessels， with stasis blocking uterus vessels as the core mechanism， and according to the characteristics of pathological changes in the course of treatment， the "three-stage advanced method" is proposed as the treatment plan. In the first stage of eliminating evil， the disease mechanism is characterized by externally-contracted heat toxin combined with endogenous dampness， stagnation and stasis in the uterus vessels， and the treatment is to clear heat and promote dampness， move qi and activate blood， and the self-prescribed Penyan Xiao Formula （盆炎消方）. In the second stage of dissolving fixed abdominal mass， the disease mechanism is characterized by qi and blood stagnation and uterus vessels obstruction， and the treatment is to break up the stagnation of blood and move qi， drive away blood stasis and clear the channels， with self-prescribed Tongguan Formula （通管方）. In the third stage of reinforcing healthy qi to support pregnancy， the disease mechanism is characterized by stasis of uterus vessels for a long period， and loss of kidney essence， therefore the treatment is to warm up the kidneys and eliminate the stasis， boost qi and nourish yin， with self-prescribed Yulin Zhuyun Formula （毓麟助孕方）. At the same time， attention should be paid to the synergistic diagnosis and treatment of traditional Chinese medicine and Western medicines， and combination of syndrome differentiation with the identification of diseases.

Small molecule drug screening technology is continuously evolving and expanding along with drug discovery,and the innovation in drug screening technology can improve the research and development efficiency and success rate,shorten the cycle time,and reduce the cost.From traditional screening technologies based on known active compounds and high-throughput screening(HTS)to new technologies such as structure-based drug discovery(SBDD),fragment-based drug discovery(FBDD),DNA encoded compound library(DEL)and proteolysis targeting chimeras(PROTAC),small molecule drug screening technologies are continuously broadening the market potential for small molecule drugs.This article will provide an overview of the current status of small molecule drug screening technology,systematically review each technique along with their advantages and disadvantages,and offer essential insights for the development of new small molecule drug screening technologies.

Objective To investigate the predictive value of serum 25-hydroxyvitamin D[25(OH)D]level in early renal transplantation for acute rejection(AR).Methods A total of 324 renal transplant recipients from January 2019 to August 2022 in the Second People's Hospital of Shanxi Province were selected.The clinical data of the recipients were collected.The levels of serum 25(OH)D,parathyroid hormone(PTH),and calcium,phosphorus in early(within 1 month)transplantation were detected by chemiluminescence immunoassay and colorimetry,respectively.The detection season was recorded,and the occurrence of AR within 1 year after renal transplantation was observed.The 25(OH)D level ≥ 20ng/ml was defined as normal,≥ 12 ng/ml～＜20 ng/ml as insufficient and＜12ng/ml as deficient,they were divided into of 25(OH)D normal group(n=106),insufficient group(n=112)and deficient group(n=106).According to the occurrence of AR,they were divided into AR group(n=51)and non-AR group(n=273).The basic situation of serum 25(OH)D level was analyzed.The differences in serum PTH,calcium,phosphorus levels and seasons as well as AR incidence among the three groups of 25(OH)D were compared.Multivariate logistic regression was used to analyze the influencing factors of AR,and receiver operating characteristic(ROC)curve was used to analyze the predictive value of serum 25(OH)D level for AR.Results The incidence of serum 25(OH)D deficiency or insufficiency was 67.28％(218/324).In the 25(OH)D normal group,insufficient group and deficiency group,the serum PTH levels were 75.44(46.42,113.23)pg/ml,78.29(58.27,152.10)pg/ml and 86.84(54.64,127.3)pg/ml,and the incidences of AR were 2.47％(8/324),6.17％(20/324)and 7.10％(23/324),respectively.All of them were the highest in the deficiency group and the lowest in the normal group,and the differences were significant(H=6.784,x2=8.580,all P＜0.05).Additionally,25(OH)D deficiency(OR=3.340,95％CI:1.409～7.916),25(OH)D insufficiency(OR=2.442,95％CI:1.006～5.925)and human leucocyte antigen(HLA)mismatch(4～6)(OR=2.117,95％CI:1.027～4.363)were independent risk factors for AR(all P＜0.05).The area under the curve(AUC)of serum 25(OH)D level in predicting AR was 0.702(95％CI:0.625～0.779),the optimal cut-off value was 13.59 ng/ml,the specificity and the sensitivity were 66.7％and 65.6％,respectively.Conclusion In this study,25(OH)D deficiency(＜12ng/ml)or insufficiency(≥ 12～＜20ng/ml)was an independent risk factor for AR,and serum 25(OH)D level may have a certain predictive value for AR.

Objective:To investigate the difference in left ventricular dysfunction between type 2 diabetes mellitus (T2DM) patients with hyperlipidemia and those without hyperlipidemia, and analyze the application value of three-dimensional speckle tracking technology.Methods:The clinical data of 70 patients with T2DM admitted to Heji Hospital Affiliated to Changzhi Medical College from January 2020 to June 2021 were retrospectively analyzed. Among these patients, 35 patients had hyperlipidemia and 35 patients had no hyperlipidemia. At the same time, 40 healthy subjects who concurrently underwent health checkups in the same hospital were included as healthy controls. All subjects underwent routine cardiac ultrasound and 3D-STE examinations. General clinical information and left ventricular function-related parameters, including global longitudinal strain, global circumferential strain, global area strain, and global radial strain were compared between healthy controls and T2DM patients with hyperlipidemia and those without hyperlipidemia.Results:The proportion of left ventricular remodeling increased in T2DM patients without hyperlipidemia, and the proportion of left ventricular hypertrophy was the highest in T2DM patients with hyperlipidemia. Global longitudinal strain and global circumferential strain in T2DM patients without hyperlipidemia were (-16.97 ± 2.59)% and (-17.41 ± 2.50)%, respectively, which were significantly higher than (-18.86 ± 2.46)% and (-18.71 ± 2.92)% in healthy controls ( t = 0.95, 0.57, both P < 0.05). Global longitudinal strain, global circumferential strain, and global area strain in T2DM patients with hyperlipidemia were (-14.98 ± 3.15)%, (-15.80 ± 3.16)%, (-27.17 ± 4.54)%, respectively, which were significantly higher than (-18.86 ± 2.46)%, (-18.71 ± 2.92)%, (-30.62 ± 4.02)% in healthy controls ( t = 0.46, 1.37, 0.98, all P < 0.05) and (-16.97 ± 2.59)%, (-17.41 ± 2.50)%, (-30.06 ± 3.59)% in T2DM patients without hyperlipidemia ( t = 0.37, 1.02, 0.77, all P < 0.05). Global radial strain in T2DM patients with hyperlipidemia was significantly higher than [(51.49 ± 8.94)%, t = 1.35, P < 0.05] in healthy controls and [(47.71± 8.46)%, t = 0.98, P < 0.05] in T2DM patients without hyperlipidemia. In patients with T2DM, fasting blood glucose and hyperlipidemia were independently correlated with all strain-related parameters. Conclusion:Hyperlipidemia can aggravate left ventricular remodeling and dysfunction in patients with T2DM and 3D-STE is one of the examination methods for subclinical left ventricular remodeling and dysfunction in T2DM patients with or without hyperlipidemia.

Virtual reality (VR) is a technology that interacts computer-generated three-dimensional scenes with the user′s senses and has been gradually applied in the real medical field. Since the first time of successful attempt in 3D laparoscopic gastrointestinal surgery VR living video broadcast in 2016, the authors have experienced the exploration of the application of this technology (2016-2017) as well as the in-depth research phase (2018-2019). Nowadays, the VR application in our center has entered into the application practice phase (2020 to present). With the technology iteration and more and more application experience acquisition, our current VR application mainly focuses on two practice settings, including the clinical teaching scenarios for early exposure to acute appendicitis for medical undergraduate students and the preoperative communication to give pati-ents an early sense of the process in the operating theatre, and has achieved good application results. With continuous breakthroughs and innovations in software and hardware, we believe that more clinical VR scenarios and the course audience will be expanded to a wider group. The integration of some new hotspots such as Meta-Universe and ChatGPT will make up for the shortcomings in VR content scenarios and interactivity, and its application prospects are infinite.

Objective:To investigate the clinical features of pregnant associated Takotsubo cardiomyopathy (PTCM).Methods:We reviewed reported PTCM cases published from January 2007 to June 2022 using the keywords "Tako-tsubo cardiomyopathy""Takotsubo cardiomyopathy" "stress cardiomyopathy" AND "parturition" "pregnancy" "cesarean delivery" "postpartum" "peripartum" "eclampsia" "abortion" in Pubmed and Web of Science databases and the corresponding Chinese words in Wanfang and Chinese Medical Journal Network. Age, obstetric history, mode of delivery, mode of anesthesia, etiological factors, clinical manifestations, treatment, and prognosis of PTCM were recorded. Descriptive statistical analysis was adopted.Results:A total of 55 articles were included, covering 60 patients with PTCM. (1) Age and time of onset: The age of onset was (32.4±6.0) years old. PTCM occurred most frequently during labor [42% (25/60)] and within one day postpartum [32% (19/60)] and during the gestational period [13%(8/60), 33.0 weeks (24.5-37.7 weeks)]. (2) Delivery-related factors: There were 38% (16/42) primiparas and 60% (25/42) multiparas. Among them, 67% (38/57) and 18% (10/57) were delivered by cesarean section and vaginal delivery, respectively. PCTM often lacks obvious triggers [40% (24/60)], with the most common inducing factor being pregnancy-related diseases [27% (16/60)]. (3) Clinical features: The initial symptoms of PTCM were dyspnea [44% (26/59)], followed by chest pain accompanied by dyspnea [17% (10/59)]. The most common subtype of PTCM was the apical type [45% (26/58)], followed by the basal type [24% (14/58)], while the biventricular type was the least common [3% (2/58)] in the PTCM classification. The left ventricular ejection fraction was (31.6±12.1) % at the onset of PTCM, which recovered to (58.2±7.6) % at discharge. PCTM was often complicated by pulmonary edema [67% (40/60)] and cardiogenic shock [55% (33/60)]. (4) Treatment and prognosis: Patients with PCTM usually require noninvasive or invasive ventilator-assisted ventilation [40% (23/58)]. One pregnant woman and five neonates died, while the remaining patients recovered well.Conclusions:PTCM should be considered in differential diagnosis of patients experiencing dyspnea and chest pain during labor and pregnancy. PTCM patients are younger and have more pulmonary edema and cardiogenic shock. Mechanical ventilation is often required, but the prognosis is favorable.

Objective:To analyze and summarize the implementation effect of basic essential surgical training (BEST) course of laparoscopic skills over the past 10 years and the practical experience in updating course content and models.Methods:The pre-class assessment questionnaires, basic laparoscopic operation assessment results, and post-class assessment questionnaires of the students who participated in the BEST course of laparoscopic skills were collected. According to the period of the course construction, the students were divided into two groups, namely students who used the course of single training system in the early stage (traditional group) and students who used the course integrating a variety of training systems after the course model was updated in the later stage (test group). The two groups were compared for the scores of track circle moving, tunnel crossing, and high and low columns, as well as their subjective evaluation of course setting and implementation effect. The t-test, Wilcoxon test, or chi-square test was conducted according to the data type using SPSS 13.0. Results:The time for 150 traditional group students to complete track circle moving, tunnel crossing, and high and low columns was 1.08 min (0.81 min, 1.60 min), 2.20 min (1.60 min, 3.27 min), and 4.86 min (3.28 min, 6.36 min), respectively, while the time for 75 test group students to complete the three operations was 1.27 min (0.87 min, 1.83 min), 2.57 min (1.58 min, 4.07 min), and 4.35 min (2.90 min, 6.42 min), respectively, with no significant difference between the two groups ( P>0.05). In terms of students' subjective evaluation of the course, a higher percentage of the test group students were satisfied with classroom environment, teaching method arrangement, training equipment, training opportunities, helping clinical work, and meeting pre-class expectations than those in the traditional group. Conclusion:The constantly updated BEST course can ensure the training quality of trainees and obtain their higher satisfaction. The benefits of this course in clinical practice can be further verified through long-term follow-up of these trainees.