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find Keyword "effect" 576 results
  • 高功率微波对视网膜神经节细胞脂质过氧化作用的实验研究

    Objective To determine the lipid peroxide damage in the primary cultured rabbit retinal ganglion cells induced by microwave. Methods Cultured rabbit retinal ganglion cells in vitro and exposed to 80 mW/cm2 of microwave for 15,30,45 min tespectively.Immediately after radiation,the morphological variation of cells was observed by optical microscope and transmission electronic microscope.Secondly,the activity of intracellular superoxide dismutase (SOD) and the content of malondialdehyde (MDA) were detected. Results Aportion of cells congregated,with their axon disapeared after radiation.Mitochondria and endoplasmic reticulum revealed swelling under transmission electronic microscope.The content of MDA was increased obviously compared with control group while SOD decreased.The content of MDA as increased obviously compared with control group after 45 min radiation was 5.11 times,while SOD decreased.The content of MDA as in control and the ganglion cells were apparantly destroyed. Conclusion Microwave can induce the lipid peroxide damage in primary cultured retinal ganglion cells,and lipid peroxide effect might be one of the mechanisms of microwave retinal damage. (Chin J Ocul Fundus Dis, 2000,16:32-34)

    Release date:2016-09-02 06:05 Export PDF Favorites Scan
  • Effectiveness and safety analyses of electronic choledochoscopy in treatment of intrahepatic bile duct stones

    Objective To evaluate effectiveness and safety of electronic choledochoscopy in treatment of intrahepatic bile duct stones. Methods From July 2013 to February 2016, 280 patients with intrahepatic bile duct stones in the Department of General Surgery of the Affiliated Hospital of Shandong Academy of Medical Sciences were selected as the research objects. All the patients were randomly divided into a choledochoscopy treatment group and a conventional treatment group by envelope principle method. There were 140 patients in each group. The safety and short- and long-term effectiveness were compared in these two groups. This study was approved by the ethics committee of the hospital. Results ① The age, gender, body mass index, course of disease, and location of stone had no significant differences in these two groups (P>0.05). ② The operations and the net stones were successfully completed in all the patients. The operative time was shorter, the blood loss was less, the incision length was smaller, the postoperative anal exhaust time was earlier, and the hospitalization time was shorter in the choledochoscopy treatment group as compared with the conventional treatment group (P<0.05). ③ The total postoperative complication rate on day 14 in the choledochoscopy treatment group was 2.9% (4/140), which was significantly lower than that in the conventional treatment group (11.4%, 16/140, P<0.05). ④ The curative excellent and good rates was 97.9% and 85.0% in the choledochoscopy treatment group and conventional treatment group respectively, which was a significant difference in these two groups (P<0.05). ⑤ The postoperative serum ALT and AST values on month 6 in the choledochoscopy treatment group were significantly lower than those in the conventional treatment group (P<0.05). Conclusion Electronic choledochoscopy in treatment of intrahepatic bile duct stones could promote rehabilitation of patient, reduce incidence of postoperative complications, and it is conducive to promoting recovery of liver function and improving follow-up effect.

    Release date:2017-08-11 04:10 Export PDF Favorites Scan
  • Protective effect of ginkgo biloba extract on photoreceptor cells aft er lightinduced retinal damage in rats

    Objective:To observe the protective effect of ginkgo bilo ba extrac t (EGb 761), a free radical scavenger, on the photoreceptor cells after lighti nduced retinal damage. Methods:Seventytwo female SpragueDa wley (SD) rats we re randomly divided into 4 groups: normal control group, lightinduced retinal da m age model group, model+physiological saline group, and model+EGb 761 group, with 18 rats in each group. All of the rats except the ones in the control group were exposed to white light at (2740plusmn;120) lx for 6 hours after the dark adap tation for 24 hours to set up the lightinduced retinal damage model. Rats in m o del + physiological saline group and model+EGb 761 group were intraperitoneall y injected daily with physiological saline and 0.35% EGb 761 (100 mg/kg), respec tively 7 days before and 14 days after the light exposure. Apoptosis of photorec eptor cells was detected 4 days after light exposure; 7 and 14 days after light exposure, histopathological examination was performed and the layer number of ou ter nuclear layers (ONL) on the superior and inferior retina was counted. Results:Four days after light exposure, the apoptosis of photorecep tor cells was fou nd on ONL in model, model+ physiological saline and model+EGb 761 group, and w as obviously less in model + EGb 761 group than in model and model+physiologic al saline group. Seven days after light exposure, the layers of ONL on the super ior retina were 3 to 4 in model and model+physiological saline group, and 7 to 8 in model+EGb 761 group; the mean of the layer number of ONL in model+EGb 761 group (6.92plusmn;0.82) was less than that in normal control group (8.40plusmn;0.95) (t=-1.416, P<0.05), but significantly more than that in model (5.96 plusmn;1.36 ) and model+physiological saline group (5.90plusmn;1.40)(t=1.024, 1.084; P<0.05). Fourteen days after light exposure, the layers of ONL on the superior retina were 0 to 1 in model and model+physiological saline group, and 3 to 4 i n model+EGb 761 group. The mean of the layer number of ONL in model+EGb 761 group (5.5 2plusmn;1.06) was significantly more than that in model (3.44plusmn;2.15) and model + physiological saline group (3.37plusmn;1.91) (t=2.082, 2.146, P<0.05). Conclusion:EGb 761 can partially inhibit the apoptosis of pho toreceptor cells, thus exert protective effect on photoreceptor cells. 

    Release date:2016-09-02 05:48 Export PDF Favorites Scan
  • SHORT-TERM EFFECT OF ROTATING HINGE KNEE PROSTHESIS

    Objective To discuss shortterm effect of rotating hinge knee prosthesis. Methods From July 2002 to April 2005, 17 cases of severe knee joint deformity and instability received rotating hinge knee prosthesis for total knee arthroplasty. There were 8 males and 9 females, aging from 41 to 79 years. The left joints were involved in 10 cases and right joint in 7 cases. All patients were admitted because of pain. The course of disease was from 1 to 7 years. There were 10 cases of osteoarthritis,5 cases of rheumatoid arthritis,1 case of traumatic arthritis after operation of left femur fracture,and 1 case of traumatic arthritis with injury of anterior cruciate ligament, meniscus medialis and medial collateral ligament after operation of left fracture of tibial plateau. According to HSS(hospital for special surgery) scoring system,the preoperative score was 36 to 58 with an average of 48.6. The preoperative flexed motion range of articulation was 21° to 80° with an average of 57.4°. Results All patients were followed up from 7 months to 3 years with an average of 23.6 months. There were no complications of thrombogenesis of veins of lower extremity, pulmonary embolism, palsy of peroneal nerve, fracture, and breakage of extended knee structure. Infection occurred in 1 case at 3 months postoperatively,the prosthesis was dislodged,antibiotic-impregnated cement was filed with knee joint,twostage arthroplasty was expected. At the last follow-up,the HSS score was 78 to 98 with an average of 91.1 in 16 patients. The flexed motion range of articulation was 75° to 100° with an average of 852° at 2 weeks postoperatively. The flexed motionrange of articular was 85° to 123° with an average of 1083° at the last followup. There were significant differences in HSS score and motion range of articular between preoperation and thelast follow-up (P<0.05). Conclusion The short-term outcome of rotating hinge knee prosthesis is good and a long term followup is necessary.

    Release date:2016-09-01 09:22 Export PDF Favorites Scan
  • Effects of resveratrol on multidrug resistance in human retinoblastoma cells

    Objective To observe the effect of resveratrol on multidrug resistance (MDR) in human retinoblastoma cells treated. Methods RB cells in logarithmic growth phase were divided into experimental group and control group. RB cells in experimental group were cultured with different concentrations of resveratrol (6.25, 12.50, 25.00, 50.00, 100.00 mu;mol/L) for 24 and 48 hours. The proliferation (absorbance value) was assayed using methyl thiazolyl tetrazolium (MTT). RB cells were cultured with 50.00 mu;mol/L resveratrol for 48 hours. The expressions of MDR-1, cyclooxygenase-2 (COX-2)、multidrug resistance-associated protein-1 (MRP-1), glutathione-S-transferases-pi; (GST-pi;) were determined by reverse transcription-polymerase chain reaction (RT-PCR) and Western blot. The RB cells of the control group were cultured with 0.5% dimethyl sulfoxide. Results Compared with the control group, the absorbance value decreased in experimental groups (6.25, 12.50, 25.00, 50.00 mu;mol/L) in a dose dependent manner (F=4.782,P<0.05). The difference of absorbance value between 50.00 and 100.00 mu;mol/L experimental groups was not significant (F=6.351,P>0.05). Compared with the control group, the mRNA (t=9.170, 5.758, 4.152, 4.638) and protein (t=3.848, 5.955, 4.541, 3.514) expression levels of MDR-1, MRP1, COX-2, and GST-pi; decreased in the experimental group (P<0.05). Conclusion Resveratrol can down-regulate the expression of MDR in RB cells.

    Release date:2016-09-02 05:26 Export PDF Favorites Scan
  • ARTHROSCOPIC TREATMENT OF INTRA-ARTICULAR MENISCAL CYSTS

    Objective To investigate the treatment and therapeutic efficacy of intra-articular meniscal cysts by arthroscopy. Methods From January 2005 to December 2009, 9 cases of intra-articular meniscal cysts were treated by arthroscopy, including 5 males and 4 females, with an average age of 33.8 years (range, 24-46 years). Six patients suffered in left knees, 3 in right ones. Just 1 case had trauma history, the others had no obvious predisposing causes. The average course of the disease was 24.2 months (range, 4-36 months). The Lysholm score was (74.2 ± 11.6) points. Arthroscopy showed that the locations of cysts were the anterior horn of lateral meniscus in 8 cases and the anterior horn of medial meniscus in 1 case; all being single cyst (of them, 3 being multilocular cyst). Results All incisions healed primarily with no compl ications of infection and joint effusion. All 9 patients were followed up from 3 to 48 months with an average of 12.7 months. Preoperative symptoms disappeared or reduced and the range of motion of the knee returned to normal. TheLysholm score was (95.1 ± 3.4) points after 3 months of operation, showing significant difference (P lt; 0.01) when compared with the socre before operation. According to assessment standard described by Choy, the treatment outcome was excellent in 6 cases, good in 2 cases, and general in 1 case; the excellent and good rate was 88.9%. No recurrence was found during follow-up. Conclusion Arthroscopic surgery shows the advantages to maintain good function of knee for the treatment of meniscal cyst, it is the best choice for intra-articular meniscal cysts because of its mini-trauma, rapid recovery, thorough treatment and less recurrence. Simultaneously, partial or tatol meniscectomy or menicus repairing under arthroscopy is performed.

    Release date:2016-08-31 05:48 Export PDF Favorites Scan
  • Experimental Studies of Micr opulse Diode Laser Treatment of Normal Retina in BN Rats

    Objective To investigate the effect of micropulse di ode laser treatment on the retina in Brown-Norway rats (BN Rats). Methods 130 eyes of BN rats received irradiance of different powers of micr opulse diode laser with 810nm wavelength through a contact lens. Fundus color photography and fundus fluorescein angiography (FFA) were performed on day 1, 3, 7, 14 and 28 days after treatment. Animals were sacrificed on 1, 3, 7, 14 and 28 days separately for historical study. The expression of heat shock protein-70 (HSP-70) in the retina was observed with immunohistochemistry. Cell apoptosis of retina tissue was examined by TdT mediated dUTP nick end labeling (TUNEL). Results (1) No change was found in no visible reaction laser spots by light microscope. High duty cycles with threshold and suprathreshold en ergies can produce severe damage even to the inner nuclear layer. (2) HSP-70 ex pression was markedly increased in the inner nuclear layer at 1d after micropulse diode laser. This increase in HSP-70 expression peaked at day 3 whereafter a decline near to normal at 2 weeks was detected. (3) Apoptosis was detected mainl y in retinal pigment epithelium, outer nuclear layer, inner nuclear layer and ev en choroid by TUNEL after micropulse diode laser treatment. The TUNEL-positive cells increased with the laser power. Maximum TUNEL-positive cells could be seen at day 3 after treatment. Conclusions The retinal injury has positive relationship with laser energy. The thermal damage is confined to the RPE and spare the neurosensory retina when using threshold power (50mW) with 50% duty-cycle and supra-threshold power with high duty-cycle (100mW,5%~15%). The hyper expression of HSP-70 and apoptosis mechanism may play an important role in the tissue repair process. (Chin J Ocul Fundus Dis,2008,24:122-126)

    Release date:2016-09-02 05:46 Export PDF Favorites Scan
  • Light-emitting diode treatment protects the photoreceptor from light-induced damage in rat

    Objective To assess the effects of 670nm LED (lightemitting diode) to protect the photoreceptor from the lightinduced damage in a rat model. Methods 32 SD rats were randomly assigned to one of eight groups: untreated control group, the LEDtreated control group, three groups of lightinduced damage,and three groups of lightinduced damage treated with LED. Lightinduced damage result from exposing to constant light for 3 hours of different illuminations of 900,1800 and 2700 lx, respectively. The LED treatment (50 mW) was delivered for 30 minutes at 3 hours before the light damage and 0,24 and 48 hours after the light damage. Retinal function and morphology were measured by electroretinogram (ERG) and histopathology assay. Results The illumination of 900 lx for 3 hours did not damage the rat retina. The illumination of 1800 lx for 3 hours resulted in thinner ONL and no OS and IS. The ratio of damaged area/total retinal area was 048plusmn;012, the damaged thickness of ONL/normal ONL (L5 ) was 039plusmn;007,and the amplitude of ERG b wave was (431plusmn;120) mu;V. With the LED treatment the ratio of damaged area decreased (M6=017plusmn;0.12, P5/6=0.002), and the ratio of the damaged thickness of ONL also decreased (L6=0.22plusmn;0.09, P5/6lt;0.01), and the amplitude of ERG b wave increased to (1011plusmn;83) mu;V(P5/6lt;0.001). The illumination of 2700 lx for 3 hours caused severed damage to the rat retina and the LED could not protect them significantly. Conclusions 670 nm LED treatment has an evident protective effect on retinal cells against light-induced damage, which may be a simple and effective therapy to prevent or to delay agerelated macular degeneration.

    Release date:2016-09-02 05:42 Export PDF Favorites Scan
  • Comparative study status on therapeutic effects of different treatments for recurrent hepatocellular carcinoma

    ObjectiveTo summarize the current comparison of the efficacy of different treatments for recurrent hepatocellular carcinoma.MethodTo search the literatures about the comparative studies on the efficacy of different treatments for recurrent hepatocellular carcinoma in recent years and analyze them.ResultsIn the treatment of recurrent hepatocellular carcinoma, percutaneous arterial chemoembolization combined with radiofrequency ablation could improve the survival rate and tumor-free survival rate to some extent, compared with the single use of percutaneous arterial chemoembolization. In the short term, there was no difference in efficacy between radiofrequency ablation and surgical resection, but the local recurrence rate of radiofrequency ablation was higher than that of surgical resection group. Salvage liver transplantation offered potential opportunity to reduce the risk of recurrence and tended to improve long-term survival outcomes, but liver sources were scarce and costly. ConclusionsAt present, there is no systematic staging scheme and treatment system for recurrent hepatocellular carcinoma. At the same time, most studies are retrospective, and more prospective studies are needed to further explore the treatment of recurrent hepatocellular carcinoma.

    Release date:2021-05-14 09:39 Export PDF Favorites Scan
  • Practical exploration of improving submission rate of pathogen examination in counterpart supported high-altitude county hospitals based on failure mode and effect analysis

    Objective To explore clinical effect of failure mode and effect analysis in improving the submission rate of pathogen examination in counterpart supported high-altitude county hospitals, and formulate practical measures and methods suitable for high-altitude county hospitals to improve the submission rate of pathogen examination. Methods Patients admitted to the People’s Hospital of Ganzi County between January and December 2024 were selected. The data of hospitalized patients between January and June 2024 were as the control group, and the data of hospitalized patients between July and December 2024 were as the intervention group. The study analyzed and compared the submission rate of pathogen testing and the pass rate of microbiological test specimens before antimicrobial treatment between the two groups. Results A total of 3 984 patients were included. Among them, there were 1 748 cases in the control group and 2 236 cases in the intervention group. A total of 10 risk factors and 2 high-risk points were identified. There were statistically significant differences in the submission rate of pathogen specimens before antibiotic treatment [36.21% (633/1 748) vs. 49.33% (1 103/2 236); χ2=68.646, P<0.001] and the qualified rate of microbiological test specimens [26.75% (122/456) vs. 36.45% (261/716); χ2=11.910, P=0.001] between the control group and the intervention group. Conclusions Failure mode and effect analysis can effectively find out the weak points in low pathogen examination submission rate in high-altitude county hospitals. According to the high-risk points to guide the formulation of relevant measures, the pathogen submission rate in the region can be effectively improved.

    Release date:2025-08-26 09:30 Export PDF Favorites Scan
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