10.3969/j.issn.2095-4344.2013.23.021

Objective:To explore the efifcacy and safety for radiofrequency catheter ablation (RFCA) of left bundle branch guided by left bundle potential (LBP), X-ray image with EnSiteNavX System in canine model.
Methods:The RFCA of left bundle branch was conducted in 13 dogs. A mapping catheter was positioned in right atrium to record right-sided His-bundle (R-His) potential, and an ablation catheter via right femoral artery was retrograded to left ventriclefor LBP mapping and ablation. Meanwhile, EnSiteNavX System was used to identify R-His, L-His and LBP at the same time. The potential characteristics in dogs with successful ablation were observed, the PR interval, QRS shape and time limit, AH interval, HV interval, the A/V electro-gram ratio in ablationcatheter at before and after ablation were recorded. The procedural time and X-ray exposure time between LBP with X-ray image method and LBP, X-ray image with EnSiteNavX System method were compared.
Results: There were 9/13 dogs received successful left bundle branch ablation, 3 dogs failed and 1 suffered from complete A-V block. At the successful ablation target site, the LBP-V was (17.8 ± 2.6) ms with the range of (13-21) ms, and the A/V electro-gram ratio<1/10. The procedural time and X-ray expose time were signiifcantly decreased in LBP, X-ray image with EnSiteNavX System method than those in LBP with X-ray image method P=0.007 and P<0.001.
Conclusion:Under the LBP, X-ray image with EnSiteNavX System guidance method, left bundle branch could be safely and effectively ablated to establish left bundle branch block (LBBB) model in experimental canine.

BACKGROUND:Coronary stent implantation can cause blood vessel damage and wal reconstruction, leading to vascular stent restenosis. Studies have found that visfatin is associated with inflammatory reaction, and exhibits an increased expression at the site of plaque rupture in acute myocardial infarction. OBJECTIVE:To investigate the influence of percutaneous coronary intervention on the levels of visfatin in patients with coronary heart disease. METHODS:Thirty patients with acute myocardial infarction within 12 hours after the onset of the chest pain, 30 patients with unstable pectoris and 30 patients with stable angina pectoris were included. Al patients were successfuly treated by percutaneous coronary intervention. Meanwhile, 30 patients only undergoing coronary angiography but not stenting treatment were selected, and another 30 patients without any treatment served as normal control group. RESULTS AND CONCLUSION:According to enzyme-linked immunosorbent method, the visfatin levels of acute myocardial infarction, unstable angina, stable angina and coronary angiography groups continue to rise at pre-operation, 30 minutes, 6 hours, 12 hours, 24 hours after operation, al of which were higher than that in the normal control group (P < 0.05). The results confirmed that within 24 hours after coronary stent implantation the visfatin levels continue to rise.

Objective:To analysis the appearances and to evaluate the diagnostic value of X-ray CT and MR imaging in osteoid osteoma.Methods:22 cases 19 females and 3 males of osteoid osteoma proved by surgical pathology and their X-ray,CT and MRI were reviewed.The ability of X-ray,CT and MRI to demonstrate the nidus and surrounding reaction were analyzed.Results:The nidus were appeared as round or oval shape and the diameter was less than 2 cm.It was fomd in 17 cases of X-ray film，22 CT and 20 of MRI .There were different degree of bone sclerosis,periosteal reaction and soft tissues or bone marrow edema around the nidus.The diagnostic accuracy was 77.3% for X-ray，100% for CT and 90.9% for MRI.Conclusion:Most of osteoid osteoma have the typical appearances and is no difficult to make diagnosis.CT scan is the most accuracy method to demonstrate the nidus.It is possible to make misdiagnosis only with X-ray or MRI for the case that the hidus not be demonstodted.

Objective To investigate the effect of songling xuemaikang(SL-xmk)pretreatment on the expression of matrix metalloproteinase-9(MMP-9)after focal cerebral ischemia-reperfusion in rats.Methods A total of 45 male Sprague-Dawley rats were randomly allocated into SL-xmk pretreatment,sham operation,and normal saline control group.Preventive gavage was per-formed for 8 weeks in rats using SL-xmk(937.50 mg/kg)suspension in the SLxmk pretreatment group(n = 15);the preventive gavage was performed in rats using the equal volume of normal saline in the sham operation(n = 15)and normal saline control(n = 15)groups.At the end of the pretreatment process,a model of middle cerebral artery occlusion(MCAO)in rats was induced by suture method for 2 hours and reperfusion for 24 hours.The effects of SL-xmk pretreatment on the neurologic deficit scores after transient MCAO,brain water content,and infarct volume in rats were observed.Immunohistochemical staining was used to detect the MMP-9 immunoreactive positive cells in ischemic brain tissue.Results The neurologjc deficit scores(1.21 ± 0.25 vs.2.37 ± 0.35,P = 0.000),the brain water content (76.24% ± 7.09% vs.88.78% ± 6.57%,P = 0.000),the percentage of infarct volume (22.62% ±2.17% vs.27.84% ±3.43%,P =0.000),and the numbers of MMP-9 positive cells(16.20 ± 2.17/mm vs.20.60 ± 2.71/mm,P = 0.000)were all significantly lower than those in the control group.Conclusions SL-xmk pretreatment may significantly inhibit the expression of MMP-9 in the brain tissue of focal cerebral ischemia-reperfusion rats and reduce brain water content and infarct volume.

Breast Neoplasms ; chemistry ; genetics ; Chromogenic Compounds ; Female ; Genes, erbB-2 ; Humans ; In Situ Hybridization ; methods ; Receptor, ErbB-2 ; analysis

ObjectiveTo study the inhibiting effects on the invasion and metastasis of melanoma by CXCR4 gene silence in nude mice.MethodsThe CXCR4 specific recombinant plasmid vector was constructed and transfected into the cultured MV3 cell line with lipofectamine.The models of subcutaneous melanoma in nude mice were established with MV3 cells.The nude mouse model of lung metastasis was established by injection of MV3 cells into the tail vein.The animals were sacrificed at 8weeks after the melanoma cells injection.CXCR4-shRNA plasmid vectors were discontinuously injected directly into the established tumor and vein.The changes of weight and size of the tumors and the mice body weight during the therapy were calculated respectively.Histological observation was performed to evaluate the presence and number of metastatic tumors.ResultsThe subcutaneous melanoma tumors in nude mice were established successfully.The growth of tumors in the CXCR4-shRNA injected nude mice was inhibitted obviously through tumor growth curve. There were significant differences between negative shRNA control nude mice and blank control nude mice (P＜0.01).Melanoma cells with CXCR4 shRNA permanent transfection had a much lower lung and brain and liver metastatic potential in nude mice than control cells and mock control cells in vivo.ConclusionsCXCR4 gene silencing mediated by shRNA significantly suppresses the growth of MV3 cell in vitro.Silencing of CXCR4 mediated by shRNA can also effectively decrease the metastatic potential of lung and liver and brain.

Culture environment is the key factor in the construction of dermal skin.It was investigated that the effects of the culture methods,including the static culture and spinner flask culture,and stir speeds on the cells proliferation,metabolism and distribution within collagenchitosan sponges.A higher cell density and specific growth rate was obtained with spinner flask culture versus static culture,especially,the 80 r/min spinner flask culture.The cell distribution in dermal substitutes from stirred culture system was more uniform than static culture,as well as that with increase of stir speeds in spinner flask.In summary,the spinner flasks culture with proper stir speed shows promise for the construction of dermal substitutes in vitro.

Objective: To examine the mediating effects of mindfulness level on resilience and symptoms of anxiety and depression among healthcare workers, so as to provide the reference for developing effective psychological intervention. Methods: The clinical doctors, nurses and public health professionals were selected using the stratified random cluster sampling method from hospitals, disease prevention and control centers, and health departments in five cities in Shandong Province, including Qingdao, Jinan, Rizhao, Jining and Liaocheng in January 2023. Basic information, mindfulness level, resilience and symptoms of anxiety and depression among healthcare workers were collected using general demographic questionnaires, the 5-item Mindful Attention Awareness Scale, 10-item Connor-Davidson Resilience Scale, Generalized Anxiety Disorder Scale and Patient Health Questionnaire, respectively. The Process program was used to analyze the mediating effects of mindfulness level on resilience and symptoms of anxiety and depression. Results: A total of 1 836 healthcare workers were investigated, including 472 males (25.71%) and 1 364 females (74.29%), and the median age was 39 (interquartile range, 12) years. There were 629 clinical doctors (34.26%), 963 nurses (52.45%) and 244 public health professionals (13.29%). The median scores of mindfulness level and resilience were 22 (interquartile range, 7) and 20 (interquartile range, 4) points, respectively. The detection rates of anxiety and depression symptoms were 49.78% and 72.28%, respectively. The mediation analysis showed that mindfulness level exerted a partial mediating effect between resilience and anxiety symptoms (β=-0.510, P<0.001), with a direct effect value of -0.130 and a mediating effect value of -0.046, and the mediating effect accounted for 26.14% of the total effect; mindfulness level also exerted a partial mediating effect between resilience and depression symptoms (β=-0.575, P<0.001), with a direct effect value of -0.120 and a mediating effect value of -0.052, and the mediating effect accounted for 30.23% of the total effect. Conclusion Mindfulness level plays a mediating effect between resilience and symptoms of anxiety and depression among healthcare workers.

Objective: To observe the efficacy of electroacupuncture (EA) plus Yi Jin Jing (Sinew-transforming Qigong Exercises) for knee osteoarthritis (KOA). Methods: A total of 60 patients with KOA were divided into an observation group and a control group according to the random number table method, with 30 cases in each group. Patients in the observation group received the treatment of EA plus Yi Jin Jing (Sinew-transforming Qigong Exercises), while patients in the control group only received EA treatment. Both groups were treated for 5 weeks. The changes of Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and visual analog scale (VAS) scores in the two groups were observed after treatment. Results: After treatment, the total effective rate in the observation group (92.3％) was significantly higher than that in the control group (70.0％), (P<0.05); the WOMAC and VAS scores in both groups were significantly lower than those before treatment, showing statistical significance (all P<0.01); there were significant differences in the post-treatment changes in the WOMAC and VAS scores between the two groups (P<0.05, P<0.01). Conclusion: EA plus Yi Jin Jing (Sinew-transforming Qigong Exercises) is clinically effective for KOA. This combined treatment can alleviate clinical symptoms.