BACKGROUND:Promoting skin wound healing is a huge challenge facing global public health.To promote faster and higher-quality wound healing,it is necessary to explore more advantageous dressings to address this problem.OBJECTIVE:To investigate the hemostatic properties of acellular dermal matrix hydrogel and its effect on skin wound healing.METHODS:(1)Acellular dermal matrix hydrogel was prepared,and the differences in microscopic morphology and main components between it and acellular dermal matrix were analyzed.(2)Acellular dermal matrix hydrogel and chitosan hydrogel were used to cover the femoral artery puncture site of rats,and the bleeding quality and coagulation time were recorded.Acellular dermal matrix hydrogel and chitosan hydrogel were mixed with rat anticoagulated blood,and the coagulation index within 30 minutes was detected.(3)A full-thickness skin defect model with a diameter of 12 mm was made on the back of 18 SD rats,and they were randomly divided into 3 groups,with 6 rats in each group:the model group used PBS to clean the wound,and the control group and the experimental group used chitosan hydrogel and acellular dermal matrix hydrogel to cover the wound,respectively.The hydrogel dressing was changed every day,and the treatment was continued for 14 days,and the wound healing was observed.On day 3 after modeling,immunofluorescence staining of inducible nitric oxide synthase(M1 macrophages)and CD206(M2 macrophages)was performed on the wound surface.On day 14 after modeling,hematoxylin-eosin staining,Masson staining,and CD31 immunohistochemical staining were performed on the wound surface.RESULTS AND CONCLUSION:(1)Scanning electron microscopy revealed that the acellular dermal matrix hydrogel had a porous structure,and the Fourier transform infrared spectrum showed that it had the same main components as the acellular dermal matrix.(2)Both acellular dermal matrix hydrogel and chitosan hydrogel had obvious hemostatic ability in vivo.In the in vitro coagulation experiments,the coagulation index of acellular dermal matrix hydrogel was significantly higher than that of chitosan hydrogel.(3)In the rat skin full-thickness defect model,both acellular dermal matrix hydrogel and chitosan hydrogel could improve the wound healing rate.Hematoxylin-eosin and Masson staining results showed that acellular dermal matrix hydrogel could reduce the infiltration of inflammatory cells in the center of the wound.Both acellular dermal matrix hydrogel and chitosan hydrogel could decrease scar width and increase collagen deposition rate.CD31 immunohistochemical staining results showed that both hydrogels could promote angiogenesis in the wound site.Immunofluorescence staining results showed that both hydrogels could reduce the proportion of M1 macrophages and increase the proportion of M2 macrophages,and the effect of acellular dermal matrix hydrogel was stronger than that of chitosan hydrogel.(4)The results show that the acellular dermal matrix hydrogel has good hemostatic properties and the ability to promote wound healing.

BACKGROUND:Promoting skin wound healing is a huge challenge facing global public health.To promote faster and higher-quality wound healing,it is necessary to explore more advantageous dressings to address this problem.OBJECTIVE:To investigate the hemostatic properties of acellular dermal matrix hydrogel and its effect on skin wound healing.METHODS:(1)Acellular dermal matrix hydrogel was prepared,and the differences in microscopic morphology and main components between it and acellular dermal matrix were analyzed.(2)Acellular dermal matrix hydrogel and chitosan hydrogel were used to cover the femoral artery puncture site of rats,and the bleeding quality and coagulation time were recorded.Acellular dermal matrix hydrogel and chitosan hydrogel were mixed with rat anticoagulated blood,and the coagulation index within 30 minutes was detected.(3)A full-thickness skin defect model with a diameter of 12 mm was made on the back of 18 SD rats,and they were randomly divided into 3 groups,with 6 rats in each group:the model group used PBS to clean the wound,and the control group and the experimental group used chitosan hydrogel and acellular dermal matrix hydrogel to cover the wound,respectively.The hydrogel dressing was changed every day,and the treatment was continued for 14 days,and the wound healing was observed.On day 3 after modeling,immunofluorescence staining of inducible nitric oxide synthase(M1 macrophages)and CD206(M2 macrophages)was performed on the wound surface.On day 14 after modeling,hematoxylin-eosin staining,Masson staining,and CD31 immunohistochemical staining were performed on the wound surface.RESULTS AND CONCLUSION:(1)Scanning electron microscopy revealed that the acellular dermal matrix hydrogel had a porous structure,and the Fourier transform infrared spectrum showed that it had the same main components as the acellular dermal matrix.(2)Both acellular dermal matrix hydrogel and chitosan hydrogel had obvious hemostatic ability in vivo.In the in vitro coagulation experiments,the coagulation index of acellular dermal matrix hydrogel was significantly higher than that of chitosan hydrogel.(3)In the rat skin full-thickness defect model,both acellular dermal matrix hydrogel and chitosan hydrogel could improve the wound healing rate.Hematoxylin-eosin and Masson staining results showed that acellular dermal matrix hydrogel could reduce the infiltration of inflammatory cells in the center of the wound.Both acellular dermal matrix hydrogel and chitosan hydrogel could decrease scar width and increase collagen deposition rate.CD31 immunohistochemical staining results showed that both hydrogels could promote angiogenesis in the wound site.Immunofluorescence staining results showed that both hydrogels could reduce the proportion of M1 macrophages and increase the proportion of M2 macrophages,and the effect of acellular dermal matrix hydrogel was stronger than that of chitosan hydrogel.(4)The results show that the acellular dermal matrix hydrogel has good hemostatic properties and the ability to promote wound healing.

To formulate an expert consensus on the principles of preoperative hair removal and provide scientific guidance for standardized removal of hair before surgical procedures so as to reduce the incidence of surgical site infections.METHODS Led by the Hospital Management Institute of National Health Commission of the People's Republic of China,this consensus was reached with the joint efforts from the expects of relevant fields such as surgeries,interventional therapies,nursing,and infection prevention and control.The consensus facilitates the classification and evaluation of literatures by following the evidence grade formulated by Oxford Evidence-based Medicine Center and focuses on the association of preoperative hair removal with surgical site infection,it reaches the evidence grade of expert consensus and recommendation intensity by integrating with discussions on meetings and clinical experience of the expects from relevant fields.RESULTS A total of 6 items of consensus were reached by summarizing the latest evidence on the aspects including the indications for preoperative hair removal,tools,range,timing and places.CONCLUSION The consensus,to some extent,make supplements to and complete the exiting regulations and standards.It provides guidance for the medical institutions to carry out the preoperative hair removal.

To formulate an expert consensus on the principles of preoperative hair removal and provide scientific guidance for standardized removal of hair before surgical procedures so as to reduce the incidence of surgical site infections.METHODS Led by the Hospital Management Institute of National Health Commission of the People's Republic of China,this consensus was reached with the joint efforts from the expects of relevant fields such as surgeries,interventional therapies,nursing,and infection prevention and control.The consensus facilitates the classification and evaluation of literatures by following the evidence grade formulated by Oxford Evidence-based Medicine Center and focuses on the association of preoperative hair removal with surgical site infection,it reaches the evidence grade of expert consensus and recommendation intensity by integrating with discussions on meetings and clinical experience of the expects from relevant fields.RESULTS A total of 6 items of consensus were reached by summarizing the latest evidence on the aspects including the indications for preoperative hair removal,tools,range,timing and places.CONCLUSION The consensus,to some extent,make supplements to and complete the exiting regulations and standards.It provides guidance for the medical institutions to carry out the preoperative hair removal.

Objective:To evaluate the effect of the positive P-glycoprotein expression on the efficacy of patient-controlled intravenous analgesia (PCIA) with sufentanil or pentazocine in patients with cancer pain.Methods:This was a retrospective cohort study. The medical records of patients with cancer pain of either sex, aged 54-71 yr, weighing 49-67 kg, with TNM stage Ⅱ-Ⅳ, who were treated in People′s Hospital of Lishui from January 2020 to January 2024, were collected. The expression of P-glycoprotein in tumor tissues was determined by the immunohistochemical method. Patients with negative P-glycoprotein expression in tumor tissues were divided into 2 groups: sufentanil group (group S 1) and pentazocine group (group P 1). Patients with positive P-glycoprotein expression in tumor tissues were divided into 2 groups: sufentanil group (group S 2) and pentazocine group (group P 2). The patients in 4 groups received 48 h of PCIA when visual analogue scale > 5 cm. The PCIA solution contained sufentanil 2 &mu;g/kg and tropisetron 10 mg in 100 ml of normal saline in S 1 and S 2 groups or pentazocine 3 mg/kg+ tropisetron 10 mg in 100 ml of normal saline in P 1 and P 2 groups. The PCIA pump was set up to deliver a 1 ml bolus dose with a 10-min lockout interval and background infusion at 2 ml/h after a loading dose of 5 ml. Flurbiprofen 50 mg was intravenously injected when visual analogue scale > 3 cm during analgesia. The consumption of sufentanil, pentazocine and flurbiprofen within 4 h, >4-12 h, > 12-24 h and > 24-48 h of PCIA was recorded. The occurrence of adverse reactions such as respiratory depression (SpO 2<90%), nausea or/and vomiting, pruritus and bradycardia was recorded. Results:One hundred patients were finally included, with 25 in each group. There was no significant difference in the consumption of sufentanil, usage rate of flurbiprofen and incidence of respiratory depression, nausea and vomiting, pruritus and bradycardia during analgesia at each time period during PCIA between group S 1 and group S 2 ( P>0.05). Compared with group P 1, the consumption of pentazocinein was significantly increased within 4 h, > 4-12 h, and > 24-48 h of PCIA ( P<0.05), and no significant change was found in the usage rate of flurbiprofen at each time period and the incidence of respiratory depression, nausea or/and vomiting, pruritus and bradycardia during analgesia in group P 2 ( P>0.05). Conclusions:Positive P-glycoprotein expression may weaken the efficacy of PCIA with pentazocine, but exerts no effect on the efficacy of PCIA with sufentanil in patients with cancer pain.

Objective To compare the value of Child-Pugh score, Model for End-Stage Liver Disease (MELD) score, MELD combined with serum sodium concentration (MELD-Na) score, CLIF Consortium Acute Decompensation (CLIF-C AD) score, and Freiburg index of post-transjugular intrahepatic portosystemic shunt (TIPS) survival (FIPS) score in predicting the survival of patients undergoing TIPS. Methods A retrospective analysis was performed for the clinical data of 447 patients with liver cirrhosis who underwent TIPS in several hospitals in southwest China, among whom there were 306 patients in the survival group and 62 in the death group. The scores of the above five models were calculated, and a survival analysis was performed based on these models. The independent samples t -test was used for comparison of normally distributed continuous data between groups, and the non-parametric Mann-Whitney U test was used for comparison of non-normally distributed continuous data between groups; the Pearson chi-square test was used for comparison of categorical data between groups; a multivariate Cox regression analysis was used for correction analysis of known influencing factors with statistical significance which were not included in the scoring models; the Kaplan-Meier method was used to evaluate the discriminatory ability of each model in identifying risks in the surgical population, and the log-rank test was used for analysis. The area under the receiver operating characteristic curve (AUC), C-index at different time points, and calibration curve were used to evaluate the predictive ability of each scoring model. Results Compared with the death group, the survival group had significantly lower age ( Z =2.884, P < 0.05), higher albumin ( t =3.577, P < 0.05), and Na + ( Z =-3.756, P < 0.05) and significantly lower proportion of patients with alcoholic cirrhosis ( χ 2 =22.674, P < 0.05), aspartate aminotransferase ( Z =2.141, P < 0.05), prothrombin time ( Z =2.486, P < 0.05), international normalized ratio ( Z =2.429, P < 0.05), total bilirubin ( Z =3.754, P < 0.05), severity of ascites ( χ 2 =14.186, P < 0.05), and scores of the five models (all P < 0.05). Survival analysis showed that all scoring models effectively stratified the prognostic risk of the patients undergoing TIPS. Comparison of the C-index of each scoring model at different time points showed that Child-Pugh score had the strongest ability in predicting postoperative survival, followed by MELD-Na score, MELD score, and CLIF-C AD score, and FIPS score had a relatively poor predictive ability; in addition, the prediction efficiency of each score gradually decreased over time. Child-Pugh score had the largest AUC of 0.832 in predicting 1-year survival rate after surgery, and MELD-Na score had the largest AUC of 0.726 in predicting 3-year survival rate after surgery, but FIPS score had a poor ability in predicting 1- and 3-year survival rates. Conclusion All five scoring models can predict the survival of patients with liver cirrhosis after TIPS and can provide effective stratification of prognostic risk for such patients. Child-Pugh score has a better ability in predicting short-term survival, while MELD-Na score has a better ability in predicting long-term survival, but FIPS score has a relatively poor predictive ability in predicting both short-term and long-term survival.

Objective:To explore the feasibility and advantages and disadvantages of local anesthesia for TiRobot-assisted removal of sacroiliac screws by comparison with general anesthesia for TiRobot-assisted removal of sacroiliac screws.Methods:A retrospective study was performed in 39 patients with posterior pelvic ring fracture-dislocation who had undergone removal of percutaneous sacroiliac screws after fracture union from January 2017 to December 2020 at Department of Orthopaedic Surgery, Hospital Affiliated to Chengdu University. Their sacroiliac screws were removed with TiRobot assistance under local anesthesia (LA group) or general anesthesia (GA group). In the LA group of 18 cases, there were 10 males and 8 females, aged (43.3 ± 8.4) years (from 25 to 58 years); in the GA group of 21 cases, there were 12 males and 9 females, aged (44.9 ± 9.0) years (from 23 to 60 years). The 2 groups were compared in terms of time for planning screw removal path, fluoroscopy frequency, fluoroscopy time, operation time, anesthesia time, anesthesia cost, postoperative visual analogue scale (VAS) and postoperative ambulation time.Results:There was no statistically significant difference in baseline data between the 2 groups, showing comparability ( P>0.05). Follow-ups revealed grade A wound healing in all patients. There were no significant differences between the 2 groups in time for planning screw removal path, fluoroscopy frequency, fluoroscopy time or operation time ( P>0.05). The anesthesia time [(41.6 ± 8.3) min], anesthesia cost [(653.5 ± 102.6) yuan] and postoperative ambulation time [(2.6 ± 0.6) h] in the LA group were significantly less than those in the GA group [(52.3 ± 9.5) min, (2,475.6 ± 261.8) yuan and (8.7 ± 2.4) h] while the VAS score in the former group (3.8 ± 1.5) was significantly higher than that in the latter group (2.5 ± 1.3) (all P<0.05). Conclusions:It is feasible to use local anesthesia for TiRobot-assisted removal of sacroiliac screws. In TiRobot-assisted removal of sacroiliac screws, compared with general anesthesia, local anesthesia may lead to shorter anesthesia time, lower anesthesia cast and shorter ambulation time, but the patients need to be compliant enough.

Background: Transjugular intrahepatic portasystemic shunt (TIPS) is widely used for reducing portal hypertension. Post-TIPS anticoagulant treatment is controversial because of lack of obligatory evidence. Aims: To systematically review the effect of anticoagulant treatment on patients with liver cirrhosis after TIPS. Methods: Randomized controlled trials (RCTs) of liver cirrhosis patients after TIPS with anticoagulant treatment (anticoagulant treatment group) or without anticoagulant treatment/placebo (control group) were retrieved from PubMed, Embase, Cochrane Library, Web of Science, CNKI, Wanfang, CBM and VIP databases in March 2020. Meta-analysis was conducted by RevMan 5.3. Results: Three RCTs involving 157 liver cirrhosis patients were enrolled. These studies mainly reported the effects of anticoagulant treatment on gastrointestinal rebleeding, stent patency, mortality and incidence of hepatic encephalopathy (HE). Meta-analysis revealed that no significant differences in total gastrointestinal bleeding rate (OR=1.04, 95% CI: 0.25-4.38, P=0.96), variceal bleeding rate (OR=1.04, 95% CI: 0.14-7.68, P=0.97), stent stenosis (OR=1.88, 95% CI: 0.73-4.79, P=0.19), occlusion (OR=0.07, 95% CI: 0.00-1.44, P=0.09), shunt dysfunction (OR=0.67, 95% CI: 0.10-4.29, P=0.67), mortality (OR=2.12, 95% CI: 0.06-72.77, P=0.68) and incidence of HE (OR=1.18, 95% CI: 0.45-3.06, P=0.74) were found between anticoagulant treatment group and control group. Conclusions: Post-TIPS anticoagulant treatment is safe and without increasing the rate of gastrointestinal rebleeding, mortality and incidence of HE. However, anticoagulant treatment does not further improve the stent patency. Therefore, anticoagulant treatment appears to be unnecessary in patients with liver cirrhosis after TIPS.

Objective: To explore the characteristics and methods of different fixation methods and prevention of open knee joint fracture. Methods: The data of 86 cases of open knee joint fracture admitted from January 2002 to December 2015 in Department of Orthopaedics, Affiliated Hospital of Chengdu University were analyzed retrospectively.There were 65 males and 21 females aged of 38.6 years. There were 38 cases treated with trans articular external fixation alone, 48 cases were in the trans articular external fixation plus auxiliary limited internal fixation group. All the patients were treated according to the same three stages except for different fixation methods. Observation of external fixation and fracture fixation, fracture healing, wound healing and treatment, treatment and related factors of infection control and knee function recovery. χ² test was used to analyze data. Results: Eleven patients had primary wound healing, accounting for 12.8%. Seventy-five patients had two wounds healed, accounting for 87.2%. Only 38 cases of trans articular external fixator group had 31 cases of articular surface reduction, accounting for 81.6%; Five cases of trans articular external fixator assisted limited internal fixation group had 5 cases of poor reduction, accounting for 10.4%; There was significant difference between the two groups (χ²=44.132, P<0.05). Take a single cross joint external fixation group, a total of 23 cases of patients with infection, accounted for 60.5% of external fixation group; trans articular external fixation assisted limited internal fixation group there were 30 cases of patients with infection, accounting for the assistance of external fixator and limited internal fixation group 62.5%; There was significant difference between the two groups(χ²=0.035, P>0.05). Five cases of fracture nonunion cases of serious infection, patients voluntarily underwent amputation. The Lysholm Knee Scale: In the external fixation group, 23 cases were less than 50 points, accounting for 60.5%, 15 cases were more than 50 points, accounting for 39.5%, external fixation and limited internal fixation group 20 cases were less than 50 points, accounting for 41.7%, 28 cases were more than 50 points, accounting for 58.3%; There was significant difference between the two groups(χ²=1.279, P>0.05). Conclusions Prevention and control of infection is a central link in the treatment of open fracture of the knee. Trans articular external fixator plus limited internal fixation is an important measure to treat open fracture of the knee-joint.

Objective: To explore the correlation between thromboelastography (TEG) parameters and the risk of venous thromboembolism (VTE) and bleeding in patients receiving anticoagulant therapy in surgical intensive care unit (SICU). Methods: 205 patients received low molecular weight heparin (LMWH) anticoagulant therapy admitted to SICU of Tianjin Hospital from December 2016 to December 2017 were consecutively enrolled. TEG detection was performed in all patients at 1 day after anticoagulation therapy, and coagulation reaction time (R value), blood clot generation time (K value), blood clot generation rate (α angle) and maximum width value (MA value) were recorded. At the same time, the traditional coagulation function test was carried out, and prothrombin time (PT), activated partial thromboplastin time (APTT) and D-dimer levels were also recorded. The incidence of deep venous thrombosis (DVT), pulmonary embolism (PE) and bleeding during hospitalization were observed. Multivariate Logistic regression analysis was used to analyze the risk factors for VTE and bleeding in patients receiving anticoagulant therapy. Results: Of 205 patients, during the anticoagulant treatment, 14 patients developed DVT, and 4 patients with PE (2 of them were combined with DVT) with an incidence of 7.8% (16/205). There were 2 patients suffering from cerebral hemorrhage, 2 patients with gastric bleeding, and 1 patient with intra-tracheal hemorrhage with an incidence of 2.4% (5/205). Compared with the patients without VTE or bleeding, the R value of TEG in patients with VTE was significantly lowered (minutes: 4.6±2.2 vs. 7.4±1.4, P < 0.01), which was significantly increased in patients with hemorrhagic complications (minutes: 12.1±1.1 vs. 7.4±1.4, P < 0.01). There was no significant difference in the K value, α angle, MA value of TEG, or PT, APTT, D-dimer between the patients with and without VTE or bleeding. Multivariate Logistic regression analysis revealed that the R value of TEG was independent risk factor for incidence of VTE and hemorrhagic complication in SICU patients who receiving anticoagulation therapy [VTE: β = 0.386, odds ratio (OR) = 1.096, 95% confidence interval (95%CI) = 1.021-2.361, P = 0.006; hemorrhagic complication: β = -1.213, OR = 1.051, 95%CI = 1.017-3.458, P = 0.045]. Conclusion The R value of TEG is associated with the occurrence of VTE and hemorrhagic complications in patients receiving anticoagulant therapy in SICU.