Objective To establish a weightlessness simulation animal model using miniature pigs, leveraging the characteristic of multiple systems’ tissue structures and functions similar to those of humans, and to observe pathophysiological changes, providing a new method for aerospace research. Methods Nine standard-grade miniature pigs were selected and randomly divided into an experimental group (n=7) and a control group (n=2). The experimental group was fixed using customized metal cages, with canvas slings suspending their hind limbs off the ground, and the body positioned at a -20° angle relative to the ground to simulate unloading for 30 days (24 hours a day). Data on body weight, blood volume, and blood biochemistry indicators were collected at different time points for statistical analysis of basic physiological changes. After the experiment, the miniature pigs were euthanized and tissue samples were collected for histopathological observation of the cardiovascular, skeletal and muscle systems HE and Masson staining. Statistical analysis was also conducted on the thickness of arterial vessels and the diameter of skeletal muscle fibers. Additionally, western blotting was employed to detect the expression levels of skeletal muscle atrophy-related proteins, including muscle-specific RING finger protein 1 (MuRf-1) and muscle atrophy F-box (MAFbx, as known as Atrogin-1), while immunohistochemistry was used to detect the expression of glial fibrillary acidic protein (GFAP), an indicator of astrocyte activation in the brain, reflecting the pathophysiological functional changes across systems. Results After hindlimb unloading, the experimental group showed significant decreases in body weight (P<0.001) and blood volume (P<0.01). During the experiment, hemoglobin, hematocrit, and red blood cell count levels significantly decreased (P<0.05) but gradually recovered. The expression levels of alanine aminotransferase and γ-glutamyltransferase initially decreased (P<0.05) before rebounding, while albumin significantly decreased (P<0.001) and globulin significantly increased (P<0.01). Creatinine significantly decreased (P<0.05). The average diameter of gastrocnemius muscle fibers in the experimental group significantly shortened (P<0.05), with a leftward shift in the distribution of muscle fiber diameters and an increase in small-diameter muscle fibers. Simultaneously, Atrogin-1 expression in the gastrocnemius and paravertebral muscles significantly increased (P<0.05). These changes are generally consistent with the effects of weightlessness on humans and animals in space. Furthermore, degenerative changes were observed in some neurons of the cortical parietal lobe, frontal lobe, and hippocampal regions of the experimental group, with a slight reduction in the number of Purkinje cells in the cerebellar region, and a significant enhancement of GFAP-positive signals in the hippocampal area (P<0.05). Conclusion Miniature pigs subjected to a -20° angle hind limb unloading for 30 days maybe serve as a new animal model for simulating weightlessness, applicable to related aerospace research.

Objective To analyze the current status and influencing factors of occupational burnout among medical staff in Dongguan City. Methods A total of 1 007 medical staff from eight hospitals in Dongguan City were selected as the study subjects using the stratified sampling method. The Maslach Burnout Inventory-Human Service Survey and Moral Injury Symptom Scale (Healthcare Professionals Edition) were used to assess occupational burnout and moral injury among these study subjects. Binary logistic regression analysis was conducted to identify the influencing factors of occupational burnout. Results The detection rate of occupational burnout among the medical staff was 46.2%, and the detection rate of moral injury was 48.1%. The result of binary logistic regression analysis showed that after controlling for confounding factors such as age, marriage status, educational level, religious belief, professional title, and hospital characteristics, male medical staff had a higher risk of occupational burnout than female staff (P<0.01). Medical staff with ≤10 years of work experience had a higher risk of occupational burnout than those with >10 years of work experience(P<0.01). Additionally, medical staff with moral injury had a higher risk of occupational burnout than those without moral injury (P<0.01). Conclusion Occupational burnout is relatively common among medical staff in Dongguan City and is influenced by factors such as gender, working years, moral injury, and others.

Objective:To explore the interaction effect of diabetes and obesity on recurrence or anal fistula in patients with perianal abscess after simple incision and drainage.Methods:The clinical data of 163 patients with perianal abscess who underwent simple incision and drainage from Jun. 2021 to Jun. 2023 were analyzed retrospectively. The incidence of recurrence or anal fistula in 6 months after surgery was calculated. Multivariate Logistic regression model was used to analyze the influencing factors of postoperative recurrence or anal fistula. The multiplicative and additive models were used to analyze the interaction effect of diabetes and obesity on the risk of postoperative recurrence or anal fistula.Results:In 6 months after simple incision and drainage, the incidence of recurrence or anal fistula was 28.22% (46/163). Univariate analysis results showed that gender, obesity, and diabetes were related to recurrence of perianal abscess or incidence of anal fistula ( P<0.05). Multivariate Logistic regression analysis results showed that obesity ( OR=2.447, 95% CI: 1.320-4.538) and diabetes ( OR=2.162, 95% CI: 1.187-3.938) were independent risk factors for postoperative recurrence or anal fistula ( P<0.05). Interaction effect analysis found that after adjusting for confounding factors, diabetes and obesity had additive interaction effect on the risk of postoperative recurrence or anal fistula. The relative excess risk due to interaction (RERI), attribution percentage (AP), and interaction effect index (S) were 1.829 (95% CI: 0.605-3.007), 0.405 (95% CI: 0.143-0.597), and 2.098 (95% CI: 1.201-3.172), respectively. There was no multiplicative interaction effect between the two ( P>0.05) . Conclusions:Diabetes and obesity are independent risk factors for recurrence or anal fistula in patients with perianal abscess after simple incision and drainage. The two may have synergistic effect on the risk of postoperative recurrence or anal fistula.

Objective:To explore the influencing factors of postoperative recurrence in patients with complex anal fistula, and to construct a nomogram model to predict the risk of postoperative recurrence and verify it.Methods:Clinical data of 310 patients with complex anal fistula who underwent fistulectomy in the hospital from Aug. 2019 to Mar. 2023 were retrospectively selected and divided into modeling group (93 cases) and validation group (217 cases) in a 3∶7 ratio according to system randomization method. Hospital electronic medical record system was used to collect patient baseline data and calculate the recurrence rate of patients 6 months after surgery. According to the data of the modeling group, multivariate Logistic regression was used to analyze the influencing factors of postoperative recurrence in patients with complex anal fistula. Based on the influencing factors, a nomogram model was established to predict the risk of postoperative recurrence, and external verification was performed based on the data of the validation group.Results:The recurrence rate at 6 months after operation was 20.43% (19/93) in the modeling group and 17.51% (38/217) in the validation group. There was no significant difference in recurrence rate between the two groups ( χ2=0.370, P=0.543) . The proportion of male, smoking history, diabetes mellitus, high anal fistula and unclear position of internal orifice in the recurrence group was higher than that in the non-recurrence group, and the body mass index and course of disease were higher than those in the non-recurrence group ( P<0.05) . Based on the above seven influencing factors, a nomogram model of the risk of recurrence of complex anal fistula after surgery was established. C index of the modeling group and the validation group was 0.984 and 0.798 respectively, the calibration curve was close to the ideal curve, and the Receiver operating characteristic AUC of the nomogram prediction model was>0.70, indicating that model consistency, prediction efficiency and differentiation were good. Conclusion:The nomogram prediction model based on gender, body mass index, smoking history, diabetes mellitus, course of disease, high anal fistula and internal orifice position can effectively predict the risk of postoperative recurrence in patients with complex anal fistula.

Objective:To investigate the difference of curative effect between zero-profile bridge-shaped locking cage (ROI-C) and anterior cage combined with titanium plate fixation in the treatment of two-level and three-level cervical spondylotic myelopathy.Methods:A total of 85 patients (43 males and 42 females), aged 52.3±8.0 years (range from 28 to 66 years) with bi- and three-level cervical spondylotic myelopathy who received surgical treatment from June 2017 to October 2019 were retrospectively analyzed. There were 63 cases of two levels and 22 cases of three levels. 45 cases were treated with zero-profile bridge-shaped locking cage ROI-C (ROI-C group), and 40 cases with anterior cage combined with titanium plate fixation (titanium plate group). The main observation indicators include operation time, intraoperative blood loss, cervical Cobb angle, fusion segment Cobb angle, average intervertebral height, pain visual analogue scale (VAS), Japanese Orthopaedic Association (JOA) Score and neck disability index (NDI).Results:All of 85 patients were followed up for 16.9±2.0 months (range 12 to 22 months). The operation time of two-level ROI-C group was 110.37±8.25 min, which was shorter than 139.5±10.54 min of titanium plate group; the intraoperative blood loss was 15.74±8.10 ml, which was less than 23.71±9.70 ml of titanium plate group; the operation time of three-level ROI-C group was 130.00±5.70 min, which was shorter than 162.83±5.59 min of titanium plate group, while the difference in the intraoperative blood loss between the two groups had no statistical significance. One year after operation, Cobb angle of cervical vertebra in double and three-level ROI-C groups were 15.31°±1.55° and 15.20°±0.42°, respectively, which were largerthan 11.23°±2.03° and 9.20°±1.14° before operation; in titanium plate group, they were 15.89°±1.13° and 16.08°±1.88°, which were higher than 11.25°±2.01° and 9.00°±1.60° before operation, and the differences had statistical significance. The differences between the two groups before operation and 1 year after operation had no statistical significance. One year after operation, the VAS scores of double and three-level ROI-C groups were 1.83±0.66 points and 2.60±0.52 points, respectively, which were less than the preoperative 7.49±0.51 points and 7.60±0.52 points; the titanium plate group was 1.79±0.50 points and 2.41±0.51 points, which were less than the preoperative 7.61±0.63 points and 7.42±0.52 points, and the differences had statistical significance. There was no significant difference between the two groups before operation and 1 year after operation. One year after operation, the JOA scores of double and three-level ROI-C groups were 15.00±0.84 points and 14.70±0.95 points, respectively, which were higher than the preoperative 7.20±0.87 points and 6.60±1.27 points; the scores of titanium plate group were 15.29±0.85 points and 14.83±0.58 points, which were higher than the preoperative 6.89±1.03 points and 6.92±0.67 points, and the differences had statistical significance. The differences between the two groups had no statistical significance. The postoperative JOA improvement rate was excellent. Postoperative dysphagia occurred in 1 case (2.22%, 1/45) in ROI-C group and 8 cases (20.00%, 8/40) in titanium plate group, and the difference in the incidence rate between two groups had statistical significance ( χ2=5.32, P=0.02). Conclusion:Both ROI-C and anterior cage combined with titanium plate fixation in the treatment of double and three-level cervical spondylotic myelopathy can achieve good short-term clinical efficacy, with shorter operation time and lower incidence rate of postoperative dysphagia using ROI-C.

Objective: To investigate the clinical effect of percutaneous curved vertebroplasty in the treatment of thoracolum-bar osteoporotic vertebral compression fractures (OVCFs). Methods: All of 85 patients with single thoracolumbar vertebral OVCFs who met the admission criteria from January 2017 to July 2018 were divided into three groups according to the random dig-its table method. They were treated with percutaneous curved vertebroplasty, routine unipedicular PVP and routine bipedicular PVP respectively. There were 25 patients in the percutaneous curved vertebroplasty group, 6 males and 19 females; aged 56-80 years, with an average age of 70.6±9.7 years. Fracture vertebral body distribution: T₁₀ 2 cases, T₁₁ 4 cases, T₁₂ 3 cases, L₁ 9 cases, L₂ 3 cases, L₃ 1 case, L₄ 1 case and L₅ 2 cases. There were 32 patients in the routine unipedicular PVP group, 6 males and 26 fe-males; aged 58-75 years, with an average age of 69.5±9.3 years. Fracture vertebral body distribution: T₁₀ 2 cases, T₁₁ 4 cases, T₁₂ 5 cases, L₁ 11 cases, L₂ 6 cases, L₃ 1 case, L₄ 1 case and L₅ 2 cases. There were 28 patients in the routine bipedicular PVP group, 5 males and 23 females; aged 59-81 years, with an average age of 69.8±8.8 years. Fracture vertebral body distribution: T₁₀ 2 cases, T₁₁ 4 cases, T₁₂ 4 cases, L₁ 10 cases, L₂ 4 cases, L₃ 1 case, L₄ 1 case and L₅ 2 cases. The operation time, injected cement volume, in-traoperative blood loss were recorded and analyzed. Preoperative, postoperative 1 week and 3 months visual analogue scale scores and oswestry disability index were adopted to value the clinical improvements. Preoperative, postoperative 1 week and 3 months relative vertebral height and kyphosis correction, and the cement leakage rate were measured and analyzed. Results: There was no significant difference in the data of gender, age, VAS scores, ODI and distribution of fracture vertebrae among the three groups (P>0.05), and the baseline data was comparable. The average VAS score in the percutaneous curved vertebroplasty group was 2.3±0.5 at 1 week after surgery, that of the routine unipedicular PVP group was 2.4±0.4 and that of the routine bipe-dicular PVP group was 2.4±0.4; the average ODI in the percutaneous curved vertebroplasty group was 19.8%±3.9%, that of the routine unipedicular PVP group was 20.0%±4.1% and that of the routine bipedicular PVP group was 19.9%±3.8%; they were lower than the preoperative data, which were statistically significant (P<0.001). The average relative vertebral height in the percutaneous curved vertebroplasty group was 48.99%±9.23% at 3 months after surgery, that of the routine unipedicular PVP group was 47.11%±10.12% and that of the routine bipedicular PVP group was 46.71%±11.16%; the average kyphosis cor-rection in the percutaneous curved vertebroplasty group was 6.21%±1.94%, that of the routine unipedicular PVP group was 5.22%±2.07% and that of the routine bipedicular PVP group was 5.97%±2.09%; there was 1 cement leakage case in the per-cutaneous curved vertebroplasty group; those of the routine unipedicular PVP group were 4 cases and those of the routine bipe-dicular PVP group were 6 cases; there was no significant difference among the three groups (P>0.05). Operation time 39.10±2.00 min vs 38.70±1.70 min, injected cement volume 3.60±0.11 ml vs 3.50±0.13 ml and blood loss 5.10±0.30 ml vs 5.00±0.40 ml of the percutaneous curved vertebroplasty group and the routine unipedicular PVP group were less than those of the routine bipedicular PVP group, which were statistically significant (P<0.05). Conclution Percutaneous curved vertebroplasty could achieve satisfactory clinical outcomes for OVCFs, with advantages of less operation time, less blood loss, limited X-ray expo-sure, less injected cement volume, and more balanced augmentation for stabilization of the affected vertebrae and total verte-bral column.

Objective To establish a simple animal model of cough variant asthma(CVA)through sensitizing Brown-Norway(BN)rats with ovalbumin(OVA). Methods A total of 36 BN rats were randomly divided into three groups, including the normal control group,the model control group and the montelukast group. BN rats in the model group and the montelukast group were intraperitoneally administered with 2.0 mg of OVA and 100 mg of Al(OH)3,and the same volume of sterile saline was given to the normal group by intraperitoneal injection. Boosting was carried out by intraperitoneal administration with 0.01 mg of OVA and 100 mg of Al(OH)33 weeks later,and the rats in the normal group were injected with the same dose of physiological saline. Three weeks later,the actively sensitized BN rats were challenged with aerosolized OVA for 7 times on alternative days,and the rats in the normal group were treated with sterile saline instead of OVA. At the same time, the montelukast group was given 1.3 mg/kg of montelukast 30 minutes before atomization by intragastric administration once a day for 2 weeks,and the normal group and the model group were given the same volume of water. The tests of cough sensitivity to capsaicin and bronchial responsiveness were performed 24 h after the last administration. Results Compared with the normal group, the times of coughing(P< 0.01)and the lung resistance(RL)(P< 0.05)in the model group were significantly increased,while the lung compliance(Cdyn)was significantly decreased(P< 0.05). There was a significant difference(P < 0.05)in the times of coughing caused by capsaicin between the model group and the montelukast group. Compared with the model group,RLin the montelukast group was decreased significantly(P< 0.05), and Cdynwas increased significantly(P< 0.05). Conclusions This rat model of CVA is similar to a variety of clinical features of CVA and is easy to operate. Thus it can be used as an effective animal model of CVA.

Histone acetylation is one of the most important reactions of post-translational modification of histones, which plays an important role in the regulation of epigenetic processes. Histone deacetylase 2 as a member of type I histone deacetylases,involved in the catalytic regulation of histone and a variety of non-histone deacetylation,regulates a variety of life processes. This paper summarizes the basic structure of histone deacetylase 2 and the role of histone deacetylase 2 in various diseases,and provides a theoretical basis for conducting related studies.

OBJECTIVE: To investigate the perioperative electrolyte imbalance in patients undergoing gastrointestinal surgery. METHODS: Retrospective case analysis was used in this study. Patients who underwent gastrointestinal surgery under general anesthesia at the Sixth Affiliated Hospital of Sun Yat-sen University from January to April 2018 were selected through electronic medical records system. Blood gas analysis during surgery must be carried out in the enrolled patients. Patients with excessive fluid infusion, critical conditions or patients who had been enrolled in other clinical trials were excluded. A total of 999 patients were enrolled. The preoperative, intraoperative and postoperative concentrations of serum sodium, potassium and calcium were collected by the last biochemical examination before surgery, arterial blood gas analysis within 1 h after anesthesia and another biochemical examination within 24 hours after surgery respectively. The type and incidence of electrolyte imbalance were then analyzed, and logistic regression analysis was used to investigate the risk factors. RESULTS: In the 999 patients, 683 cases were male (63.9%) and 361 cases were female(36.1%), with an average age of (56.9±14.6) years old. Fifty-eight patients (5.8%) underwent emergency surgery and 941 patients (94.2%) underwent elective surgery; Sixty-two patients were treated with laxatives at least 3 times and 115 patients were treated with enema at least 3 times before operation. The incidence of hypokalemia was 49.6%(496/999) intraoperatively and decreased to 15.2%(152/999) postoperatively. No hyperkalemia cases were found. The incidence of hypocalcemia was 53.8%(537/999) intraoperatively and increased to 79.7% (796/999) postoperatively. The incidence of hypokalemia in ileus patients was 33.3%(17/51) before surgery, which was higher than that in patients with colorectal cancer [12.3%(86/703)], patients with gastric cancer [7.8%(8/104)] and patients with other gastrointestinal diseases[10.6%(15/141)] (all P<0.05). Similarly, the preoperative and intraoperative incidence of hyponatremia in ileus patients were both 15.7%(8/51), which were higher than those in patients with colorectal cancer [3.0% (21/703) and 2.3% (16/703)] and patients with gastric cancer [2.9%(3/104) and 1.9%(2/104)]. The incidence of hypocalcemia in ileus patients was 31.4%(16/51) preoperatively, which were also higher than those in patients with colorectal cancer [7.4%(52/703)] and patients with gastric cancer [8.7%(9/104)] (all P<0.05). Logistic regression analysis showed that ileus and emergency surgery were risk factors for patients with preoperative electrolyte imbalance; preoperative electrolyte imbalance was a risk factor for intraoperative electrolyte imbalance; intraoperative electrolyte imbalance was a risk factor for postoperative electrolyte imbalance; preoperative electrolyte imbalance was a risk factor for postoperative imbalance of sodium and potassium. CONCLUSIONS The incidence of electrolyte imbalance is high in patients undergoing gastrointestinal surgery, especially hypocalcemia and hypokalemia. It is necessary to recognize the electrolyte abnormality timely and give active intervention and correction.
Adult ; Aged ; Digestive System Surgical Procedures ; Electrolytes ; Female ; Humans ; Hyponatremia ; Ileus ; Male ; Middle Aged ; Postoperative Complications ; prevention & control ; Retrospective Studies ; Risk Factors ; Water-Electrolyte Imbalance

Objective: To research the anti-inflammatory and anti-allergic effects of Qifangbimin particle.Methods: The anti-inflammatory effects were observed by the methods of xylene-induced ear-swelling in mice and cotton-ball induced granuloma in rats.The anti-allergic effects were evaluated by the method of passive skin allergy model in rats and ear-heterogeneous passive skin allergy model in mice.Results: In the treatment groups with Qifangbimin particle, the swelling degree of ear edema induced by dimethylbenzene in mice was significantly suppressed when compared with that in the control groups (P<0.01 or 0.05) , however, the particle had no significantly inhibitory effect on granulation tissue hyperplasia induced by cotton-ball in rats.The Qifangbimin particle groups obviously decreased the absorbance value of locus coeruleus on rats' back (P<0.01 or 0.05), and Qifangbimin particle at high dose significantly reduced the absorbance value of locus coeruleus of auricle in mice (P<0.01 or 0.05).Conclusion: Qifangbimin particle has significant anti-inflammatory and anti-allergic effects.