Objective To study the effects and mechanism of Yunnan Baiyao on the inflammatory response and satellite cell regeneration after acute injury of skeletal muscle in rats. Methods Rat models of skeletal muscle injury (gastrocnemius,fast twich;soleus,slow twich) induced by treadmill were constructed 24 h after establishment of the models,the left sides of hind limbs in rats were treated with Yunnan Baiyao,and the right sides were treated with saline at the equal volume.4 rats were chosen 2,4,7,10,14 d after injury,respectively,and gastrocnemius and soleus of the treated sides (the left sides) and untreated sides (the right sides) from hind limbs of 4 rats were obtained,and stained with immunohistochemistry and HE. The quantity and morphological changes of inflammatory cells and satellite cells were observed under optical microscope. Results Compared with untreated sides,the number of inflammatory cells of fast twich after injury in the treated sides was decreased obviously at the 2nd,4th,7th day after injury(P

Aim To establish an in vitro early drug cardiac tox-icity evaluation method by human embryonic stem cells derived cardiomyocytes ( hESC-CM) and real-time cell analysis Cardio (RTCA Cardio) system. Method The hESC-CM were cultured at RTCA Cardio E-Plate 96. Impedance signals from hESC-CM were analyzed for beating rate, contraction amplitude and beating rhythm irregularity to determine the optimum inoculation density and detection duration. Based on this, we used 0. 1 % DMSO to be the solvent and quinidine (0. 2, 0. 78, 3. 13, 12. 5, 50 and 100 μmol·L - 1 ) known as affecting cardiac activity to validate this method. Result The results revealed no significant changes in the cell index (CI), transient pulse patterns, beating rate and amplitude of hESC-CM. Quinidine will affect the CI and transi-ent pulse patterns of hESC-CM and decrease the beating rate and amplitude of hESC-CM when its concentration ≥3. 13 μmol · L - 1 . And this effect is concentration-dependent, the higher the concentration,the more time they need to recover beating and the more significant the beating rate and amplitude inhibition of quinidine on hESC-CM. Conclusion The method established by hESC-CM and RTCA Cardio system can detect the effect of quinidine on the contraction of hESC-CM, and this indicates that this method has the potential to be an attractive high-throughput tool for screening potential drugs in early evaluation of drug car-diotoxicity.

Objective:To investigate the application value of one-stitch prophylactic ileostomy in late ileostomy closure.Methods:The prospective randomized control study was conducted. The clinicopathological data of 141 patients with rectal cancer who underwent low anterior resection combined with prophylactic ileostomy in the Affiliated Tumor Hospital of Zhengzhou University from January 2016 to July 2020 were selected. There were 127 patients being selected after excluding 14 cases who did not undergo ileostomy closure. Patients undergoing one-stitch prophylactic ileostomy were divided into observation group, and patients undergoing traditional ileostomy were divided into control group. Observation indicators: (1) grouping situations of the enrolled patients; (2) surgical situations of ileostomy closure; (3) postoperative situations; (4) follow-up. Follow-up was conducted using outpatient examination and telephone interview once a month after low anterior resection combined with prophylactic ileostomy to detect complication and death of patients. The end point was at 3 months after ileostomy closure. The follow-up was up to July 2020. Measurement data with normal distribution were represented as Mean±SD, and comparison between groups was conducted using the independent sample t test. Measurement data with skewed distribution were represented as M( P25, P75) or M (range), and comparison between groups was conducted using the Mann-Whitney U test. Count data were described as absolute numbers, and comparison between groups was conducted using the chi-square test. Comparison of ordinal data between groups was conducted using the Mann-Whitney U test. Results:(1) Grouping situations of the enrolled patients: a total of 127 patients were selected for eligibility, aged from 31 to 83 years, with a median age of 64 years. Of 127 patients, there were 66 cases in observation group and 61 cases in control group. (2) Surgical situations of ileostomy closure: all patients from the two groups underwent ileostomy closure successfully. The incision length, operation time, volume of intraoperative blood loss, cases with abdominal adhesion degree as slight adhesion or obvious adhesion were 4.25 cm(4.00 cm, 5.00 cm), 48.00 minutes(33.75 minutes, 58.00 minutes), 30 mL(20 mL, 50 mL), 34, 32 of the observation group, versus 7.50 cm(7.00 cm, 8.50 cm), 70.00 minutes(57.00 minutes, 80.00 minutes), 30 mL(30 mL, 50 mL), 13, 48 of the control group, showing significant differences between the two groups ( Z=-9.549, -6.133, -2.758, χ2=12.405, P<0.05). (3) Postoperative situations: cases with incision infection of the observation group and the control group were 5 and 13, respectively, showing a significant difference between the two groups ( χ2=4.917, P<0.05). (4) Follow-up: all the 127 patients were followed up for 6-21 months, with a median follow-up time of 10 months. During the follow-up, 3 cases of the control group had postoperative incisional hernia and were cured after conservative treatment. None of patient had anastomotic leakage related complications or died during the follow-up. Conclusion:The one-stitch preventive ileostomy has the advantage of ileostomy closure, which can reduce the operation time, volume of intraoperative blood loss and shorten the incision length effectively, so as to reduce the incidence of postoperative incision infection related complications.

Objective:To evaluate a nano-carbon lymphatic tracing method for patients with rectal cancer after neoadjuvant radiotherapy and chemotherapy .Method:Retrospective analysis was made on 88 patients of rectal cancer undergoing neoadjuvant chemoradiation at the Department of General Surgery, He′nan Cancer Hospital from Jan 2016 to May 2020.According to whether nano-carbon lymph node was used or not, patients were divided into nanocarbon tracer group (study group) and non-nanocarbon tracer group (control group).Results:There was statistically significant in the number of havested lymph nodes between the two groups [15(11-19) vs.9(5-12), Z=5.227, P<0.001], There was no statistically significant in the number of positive lymph nodes between the two groups [0(0-0.25) vs.0(0-1), Z=1.199, P=0.231]. There were significant differences in the ratio of patients with less than 7 lymph nodes(0/34 vs.18/54, χ 2=14.248, P<0.001) and patients with less than 10 lymph nodes (4/34 vs.29/54, χ 2=15.657, P<0.001). Conclusions:The injection of nanocarbon after neoadjuvant chemoradiotherapy can increase the number of harvested postoperative lymph nodes and the ratio of patients with lymph nodes ≥7 and ≥10, which is more beneficial for prediction of the prognosis of patients.

Objective:To investigate whether adjuvant chemotherapy could be beneficial for patients with pT1N1M0 (stage ⅠB) gastric cancer.Methods:From Jan 2010 to Dec 2016, 185 patients with pT1N1M0 gastric cancer who were surgically resected at Henan Cancer Hospital were retrospectively analyzed. The patients were divided into chemotherapy group ( n=100) and non chemotherapy group ( n=85). Results:For disease-free survival (DFS) analysis, univariate survival analysis showed that age, examined lymph nodes, vascular invasion, nerve invasion and adjuvant chemotherapy were associated with DFS (all P<0.05); multivariate analysis showed that lymph node resection ≥ 16 ( HR=0.363, 95% CI: 0.160-0.827, P=0.016), vascular invasion ( HR=4.117, 95% CI: 1.796-9.436, P=0.001) and postoperative chemotherapy ( HR=4.530, 95% CI: 1.932-10.622, P=0.001) were independent risk factors for DFS. For disease-specific survival (DSS) analysis, univariate survival analysis showed that lymph node resection, vascular invasion, nerve invasion and adjuvant chemotherapy were associated with DSS; multivariate analysis showed that lymph node resection ≥ 16 ( HR=0.344, 95% CI: 0.144-0.822, P=0.016), vascular invasion ( HR=5.113, 95% CI: 2.029-12.887, P=0.001) and postoperative chemotherapy ( HR=4.694, 95% CI: 1.854-11.888, P=0.001)were independent risk factors for DSS. According to examined lymph nodes and vascular invasion , pT1N1M0 patients were divided into three risk categories (high, medium and low). DFS and DSS were significantly different among the three risk groups (all P<0.001, respectively). Conclusion:pT1N1M0 gastric cancer patients are expected to benefit from adjuvant chemotherapy. Patients with less than 16 lymph nodes and vascular invasion may be particularly suitable for adjuvant chemotherapy.

Objective To investigate the mechanism of pulmonary inflammation induced by influenza virus , and provide reference for the development of effective drugs for viral pneumonia .Methods An influenza PR8 infection mouse model was established .The levels of inflammatory cytokines and complement molecules were determined using RT -PCR and ELISA.The pathological changes were examined using biopsy .The complement inhibitor cobra venom factor ( CVF) was injected intraperitoneally at a dose of 50 μg/( kg· 24 h) , and then body mass .The survival rate and inflammatory factors were examined .Results Compared with the control group , the expressions of complement regulatory molecule Crry and CD59 were significantly decreased (P<0.01), while those of complement C9 and complement receptor C3aR and C5aR were significantly increased in the lungs of influenza model mice (P<0.01).Pro-inflammatory cytokines TNF-α, IL-6 and IFN-γwere highly expressed , but anti-inflammatory cytokine IL-2 was lowly expressed in serum .Treatment with CVF caused a sight body mass loss, a survival rate increase and a lung index decrease (P <0.05).Moreover, an IL-2 expression increase and a decrease of IL-6, TNF -αand INF-γexpression were observed in CVF treatment mice ( P< 0.05).Conclusion Inhibition of complement activation can increase the survival rate of mice with influenza pneumonia and decrease pulmonary indexes .thus delaying the pathogenesis of PR 8.

Objective:To investigate the clinical significance of MRI dynamic enhancement in defining the upper edge of adenocarcinoma of esophagogastric junction.Methods:The clinical data of 73 patients with adenocarcinoma on the esophagogastric junction operated from Jul 2018 to Aug 2019 in the Affiliated Cancer Hospital of Zhengzhou University were retrospectively analyzed. All patients underwent MRI examination within one week before surgery. First, the T 2WI, diffusion-weighted imaging and dynamic enhanced images of each patient were carefully observed to define the tumor location, size, shape, signal and enhancement mode, then the distances between the upper edge of the tumor and the cardiac incisure on MRI dynamic enhancement were measured independently, and compared with the measured distance in surgical fresh specimens. Results:The mean location of tumor upper edge measured in MRI of 73 patients was (1.75±1.98)cm, while measured in the surgical specimen was (1.72±1.97)cm. There was no significant difference between the two groups ( t=0.572, P=0.569). The intraclass correlation efficient between the two groups was excellent (ICC=0.974, 95% CI: 0.959-0.984, P<0.01). Conclusion:The measurement result of tumor upper edge in MRI is basically consistent with that of surgical specimens. MRI can be used to locate the tumor upper edge for adenocarcinoma of esophagogastric junction before operation.

Object:To explore surgical treatments for duodenal fistula with intra-abdominal infection.Methods:The data of 19 patients with duodenal fistula treated at the Affiliated Tumor Hospital of Zhenzhou University between Jan 2015 and Dec 2021 were analyzed retrospectively. Surgery is performed with duodenostomy or modified duodenal shunt procedures.Result:All patients were accompanied by intra-abdominal infection, including 9 duodenal stump fistulas. All patients successfully completed the operation,11cases underwent duodenostomy, 8 case underwent modified duodenal shunt procedures. operating time was 110(60-140)min, postoperative hospitalization time was 29(9-103)d. Two patients died postoperatively. Fistula heals in other patients.Conclusion:Surgical intervention for duodenal fistula should focus on controlling the source of infection, strengthening intestinal and abdominal drainage, and reducing postoperative complications.

Objective:To investigate the effects of preoperative endoscopic mucosal injection of carbon nanoparticle tracer and intraoperative serosa injection of carbon nanoparticle tracer on the acquisition of lymph nodes in total gastrectomy for gastric cancer.Methods:The retrospective cohort study was conducted. The clinical data of 118 patients with gastric cancer who underwent total gastrectomy in the Affiliated Tumor Hospital of Zhengzhou University between May 2017 and April 2018 were collected. There were 79 males and 39 females, aged from 26 to 81 years, with an average age of 59 years. Of 118 patients, 56 patients undergoing preoperative endoscopic mucosal injection of carbon nanoparticle tracer were divided into observation group and 62 patients undergoing intraoperative serosa injection of carbon nanoparticle tracer were divided into control group. Observation indicators: the total number of lymph node dissected, the number of positive lymph node dissected, the number of lymph node dissected at the first station and the number of lymph node dissected at the second station. Measurement data with normal distribution were represented as Mean± SD, and comparison between groups was analyzed using the independent-sample t test. Measurement data with skewed distribution were represented as M (range), and comparison between groups was analyzed using the Mann-Whitney U test. Count data were described as absolute numbers, and comparison between groups was analyzed using the chi-square test or Fisher exact probability. Comparison of ordinal data was analyzed using the rank sum test. Results:The total number of lymph node dissected, the number of positive lymph node dissected, the number of lymph node dissected at the first station, the number of lymph node dissected at the second station of the observation group were 48±16, 3(range, 0-25), 26±9, 23±7, respectively. The above indicators of the control group were 41±13, 4(range, 0-28), 25±8, 16±5, respectively. There were significant differences in the total number of lymph node dissected and the number of lymph node dissected at the second station between the two groups ( t=2.494, 6.588, P<0.05), and there was no significant difference in the number of positive lymph node dissected and the number of lymph node dissected at the first station between the two groups ( Z=0.747, t=1.689, P>0.05). Conclusions:Carbon nanoparticle labeled lymph node staining using preoperative endoscopic mucosal injection of carbon nanoparticle tracer or intraoperative serosa injection of carbon nanoparticle tracer is safe and effective in total gastrectomy for gastric cancer. Compared with intraoperative serosa injection of carbon nanoparticle tracer, preoperative endoscopic mucosal injection of carbon nanoparticle tracer can increase the total number of lymph node dissected, especially the number of lymph node dissected at the second station of gastric cancer.

Background: During hot environment work tasks with whole-body enclosed anti-bioaerosol suit, the combined effect of heavy sweating and exhaled hot humid air may cause the N95 medical respirator to saturate with water/sweat (i.e., water-blocking). Methods: 32 young male subjects with different body mass indexes (BMI) in whole-body protection (N95 medical respirator + one-piece protective suit + head covering + protective face screen + gloves + shoe covers) were asked to simulate waste collecting from each isolated room in a seven-story building at 27-28°C, and the weight, inhalation resistance (Rf), and aerosol penetration of the respirator before worn and after water-blocking were analyzed. Results: All subjects reported water-blocking asphyxia of the N95 respirators within 36-67 min of the task. When water-blocking occurred, the Rf and 10-200 nm total aerosol penetration (Pt) of the respirators reached up to 1270-1810 Pa and 17.3-23.3%, respectively, which were 10 and 8 times of that before wearing. The most penetration particle size of the respirators increased from 49-65 nm before worn to 115-154 nm under water-blocking condition, and the corresponding maximum size-dependent aerosol penetration increased from 2.5-3.5% to 20-27%. With the increase of BMI, the water-blocking occurrence time firstly increased then reduced, while the Rf, Pt, and absorbed water all increased significantly. Conclusions This study reveals respirator water-blocking and its serious negative impacts on respiratory protection. When performing moderate-to-high-load tasks with whole-body protection in a hot environment, it is recommended that respirator be replaced with a new one at least every hour to avoid water-blocking asphyxia.