Objective To develop a tissue engineering scaffold by using 4arm branched polyethylene glycol-VS (PEG-VS) crosslinked with decellularized valved conduits (DVC), and to research on its mechanical and biological functions. Methods The valved aortic conduits of rabbits were taken and decellularized by trypsin method and then were crosslinked with 4arm branched PEG-VS to construct the composite scaffolds (CS). The functions of decellularized valved conduits and the composite scaffolds were tested by mechanics test system. Thirty New Zealand white rabbits were equally and randomly assigned to one of the three groups: the control group, the DVC group, and the CS group. Valved aortic conduits, decellularized valved conduits and composite scaffoldswere transplanted into the common carotid artery of the abovementioned three groups of rabbits respectively. Twentyeight days after the operation, patency of the transplants was tested by Color Doppler ultrasound; micromorphology and inflammatory infiltration were observed by hematoxylin eosin（HE） staining andscanning electron microscope (SEM)，and endothelialization of composite scaffolds was detected by immunofluorescent staining. Results A series of biomechanical analyses revealed that the composite scaffolds had highly similar mechanical properties as fresh tissue, and had superior elastic modulus (P=3.1×10-9) and tensile strength (P=1.1×10-6) compared with decellularized valved conduits. Color Doppler ultrasound revealed that the graft patency for the CS group was better than the control group (P=0.054) and the DVC group (P=0.019), and the intraaortic thrombosis rate and distortion rate decreased significantly. HE staining and SEM showed that the endothelialization of composite scaffolds in the CS group was significantly higher than the other two groups with the endothelial cells evenly distributed on the scaffolds. The [CM(159mm]immunofluorescent staining indicated that the positive rate of the endothelial cell marker CD34 was higher than the other two groups. Conclusion The composite scaffolds using 4arm branched PEGVS crosslinked with DVC have great mechanical and biological properties.
Objective To investigate the diagnostic value of esophageal high-resolution manometry combined with salivary pepsin levels in laryngopharyngeal reflux disease (LPRD). Methods The patients with the chief complaint of “throat discomfort” for treatment at the Department of Otolaryngology, Head and Neck Surgery, the First People’s Hospital of Longquanyi District, Chengdu / West China Longquan Hospital Sichuan University between January and October 2022 was selected. According to the reflux findings score and refluxsymptomindex at admission, the enrolled patients were divided into LPRD group and non-LPRD group. The basic patient information, esophageal high resolution manometry, and salivary pepsin concentration of included patients were collected. Results A total of 112 patients were included. Among them, there were 68 cases (60.7%) in the LPRD group and 44 cases (39.3%) in the non-LPRD group. The LPRD group was significantly younger (P=0.007) , but the salivary pepsin concentration (P<0.001), upper esophageal sphincter (UES) resting pressure (P<0.001) and distal contractile integral (P=0.007) were all higher than the non-LPRD group. The results of multivariate logistic regression analysis showed that salivary pepsin concentration [odds ratio (OR)=1.077, 95%CI (1.035, 1.120), P<0.001] and UES resting pressure [OR=1.035, 95%CI (1.019, 1.052), P<0.001] were independent factors for the diagnosis of LPRD. The area under the working curve (0.971), specificity (0.99), and sensitivity (0.77) in the combined index were higher than those of saliva pepsin concentration and UES resting pressure. Conclusion Esophageal high resolution manometry and salivary pepsin are significant for the diagnosis of LPRD, and their combined application can improve the diagnostic value and also serve as an alternative method for the diagnosis of LPRD.
Objective To investigate the awareness of rational use of drug (RUD) on medical workers in hospitals of different ranks, the establishment and execution of relevant strategies in hospitals of different ranks, and the main factors affecting RUD on medical workers, so as to provide references for the generalization of RUD. Methods A certain number of different ranks of hospitals in Chengdu and Zigong were randomly selected by the convenience sample method. Medical workers in each hospital were selected through face-to-face interviews with a self-designed questionnaire. Monte Carlo Chi-square analysis was applied on the hospital ranks and formulation of RUD guidelines, and logistic regression analysis was performed on the awareness of RUD knowledge of the respondents. Results Among 700 questionnaires distributed, 672 were retrieved (response rate 96.0%). The numbers of respondents who were familiar with the Pharmaceutical Affairs Councils (PACs) as well as the Pharmacy and Therapeutics Committees (PTCs) were 217 (32.29%) and 83 (12.35%), respectively. The number of respondents who understood the concept of essential medicine was 502 (74.71%). A total of 441 (61.16%) medical workers had been trained on RUD, 199 (29.61%) medical workers denied there were PTCs in their hospitals, and 60.71% of the medical workers mentioned that the use of drug was monitored and controlled with the feedback in their hospitals. The result of logistic regression analysis indicated that the professional title (P=0.038), awareness of essential medicine (Plt;0.001) and participation of RUD training (P=0.008) were the factors influencing the awareness of RUD. Conclusion Both management and education should be executed at the same time to elevate the level of rational use of drug. In order to increase the level of RUD we should complete monitoring institution and improving RUD awareness of workers. Additionally enhancing the rationality of medication should be performed by establishing guidelines of treatment or medication. Improving personal knowledge, scientific information and medication custom should be performed by standardizing regulations, strengthening management, emphasizing education and promoting communication between doctors and patients.