There are many difficulties in studying Radiation & Oncology.We improve the teaching effect by selecting the proper teaching content,optimizing the teaching mode,cultivating idea of multidisciplinary tumor management and clinical teaching.

Objective To explore the anti-hyperuricemia activity of bergenin in the model of hyperuricemic mice induced by potassium oxonate. Methods 60 Kunming male mice were divided randomly into six groups, which were normal control group;hyperuricemic model group;and hyperuricemic groups with 20 , 40 , 60 mg/kg berge-nin, and 5 mg/kg allopurinol. Mice were orally administered once daily with 250 mg/kg potassium oxonate for 7 continuous days to create the model, and then three doses of bergenin and allopurinol were orally initiated on the day 1 h after potassium oxonate was given, separately. Serum uric acid, creatinine and urea nitrogon levels, as well as urinary uric acid and creatinine levels were measured. mRNA and protein expression levels of mouse kidney u-rate transporter 1(URAT1), and glucose transporter 9(GLUT9) were also determined. Results Compared with hyperuricemic model group, bergenin significantly reduced serum uric acid, creatinine and urea nitrogon levels, in-creased 24 h uric acid and creatinine excretion, and fractional excretion of uric acid in hyperuricemic mice;mRNA and protein levels of mURAT1 and mGLUT9 were also markedly down-regulated. Conclusion Anti-hyperuricemia effect of bergenin is attributed to the enhancement of uric acid excretion and reversion of mouse urate transporters o-ver-expression.

Objective To investigate the dose-respeuse relationship of levobupivacaine for spinal anesthesia in patients undergoing cesarean section.Methods Sixty ASA Ⅰ or Ⅱ patients aged 25-35 yr weighing 60-90 kg scheduled for elective cesarean section under spinal anesthesia were enrolled in this study.Spinal puncture was performed at the L3,4 interspace.A 25 G spinal needle was inserted into the subarachnoid space cephalad.The patients were randomized to receive levobupivacaine 7.5 mg (group L1 ),10 mg (group L2),12.5 mg (group L3) or 15 mg (group L4) diluted to 3 ml with 5% glucose over 30 s (n = 15 each).The degree of pain was evaluated at the time of skin incision using visual analogue scales (VAS) (0 = no pain and 10 = worse pain ever).Effective analgesia was defined as VAS = 0.Spinal analgesia was inadequate when VAS≥1 and then 1% lidocaine 5-10 ml was given epidurally.The doses of levobupivacaine for effective analgesia in 50% and 95% of patients ( ED50 and ED95 ) and 95 % confidence interval were calculated by Probit method.Results The ED50 of levobupivacaine was 9.0 mg (95% confidence interval 7.8-9.9 mg) and ED95 13.2 mg (95% confidence interval 11.6-17.6 mg) for spinal anesthesia.Conclusion The ED50 and ED95 of levobupivacaine for spinal anesthesia in patients undergoing cesarean section are 9.0 mg and 13.2 mg respectively.

Glucose-6-Phosphatase (G6Pase) was regarded as a marker enzyme of the endoplasmic reticulum in a number of different cells. The purpose of this report is to study the localization of G6Pase activity in the rat left ventricular myocardial cells. G6Pase activity was found in the lumen of the nuclear envelope, the sarcoplasmic reticulum(SR) and the subsarcolemmal cisterns. The SR tubules between the adjacent myofibrils displayed characteristic distribution on their longitudinal profiles, as a curtain-like network, the tubules appeared to be tight network facing A-band, whereas tubules formed large polygonal meshes facing I-band. It is thought that the SR tubules facing A- and I-bands, respectively, represented an adaptation of SR to the selective shortening of the myofibrils at the I-band during contraction.

Left ventricular myocardial hypertrophy was produced in the rats by ligation of the abdominal aorta below the diaphragm for seven weeks.Ultrastructurally, it was observed that the nucleus and nucleolus were enlarged, and the density of the chromatin of the hypertrophied myocardial cells was decreased. Free ribosomes and endoplasmic reticulum were increased. Golgi apparatus was well developed and was increased in number.Cytochemically, G6Pase activity was localized in the lumen of the sarcoplasmic reticulum, nuclear envelope and subsarcolemmal cisterns, and it was also positive in the regenerative rough endoplasmic reticulum. TPPase activity appeared in the Golgi apparatus, and it was especially prominent in the Golgi apparatus of the hypertrophied cells.These findings suggest that the protein synthetic activity was increased in the hypertrophied myocardial cells.

Objective To explore the clinical features and the cause of secondary phosgene poisoning after rescuing the patients with acute phosgene poisoning.Methods According to the diagnostic criteria of occupational acute phosgene poisoning,the differences of clinical manifestation,laboratory results and chest X-ray between secondary poisoning patients and primary patients were compared.Results Among the 25 patients with secondary phosgene poisoning,14(56.0%) had cough,13(52.0%)had throat stimulus,10(40.0%)had chest stuffiness,2(8.0%)had polypnea,1(4.0%) had pain in the eye.There was no significant difference in clinical manifestation between the secondary and primary patients. No positive sign was found after the examination of pulmonary function in the 25 patients,but all of them had abnormal chest X-ray,and typical bronchitis could be found.According to the diagnostic criteria,the 25 patients had slight acute phosgene poisoning,and recovered after treatment for 7 to 10 days.Conclusion To prevent the secondary phosgene poisoning after treating the patients with acute phosgene intoxication,medical workers should enhance protection awareness and take some necessary measures.

Objective To investigate effects of dynamic hip screw (DHS) fixation assisted with blocking screws in treatment of intertrochanteric fracture.Methods A total of 150 patients with intertrochanteric fracture were selected as the combined treatment group,of which the patients managed by DHS intemal fixation were followed by the parallel placement of a blocking screw closely beneath the main screw for stability with its end rested on the plate.Another 87 patients managed by DHS fixation alone were determined as the control group.The surgical outcomes of the two groups were analyzed and compared.Results Good fixation without external displacement of femoral neck and cut-out of the main screw in femoral head was achieved in the combined treatment group.Also,fracture nonunion or death did not exist in the combined group.The patients in combined treatment group could take care of themselves after operation in the absence of severe pain and functional disturbance,with higher excellence rate (98.7％)than that in control group (P ＜ 0.01).Whereas,the operation failure rate was significantly lower in combined treatment group than in control group (P ＜ 0.05).Conclusion DHS fixation assisted with blocking screws is an ideal treatment of incomplete intertrochanteric fracture in medial wall of calcar femorale for it can achieve reliable fixation and definite curative effect,favor fracture healing,early functional exercise and low incidence of postoperative complications.

Objective To investigate the effect of posterior pedicle screw reduction and fixation,decompressive laminectomy and massive autogenous bone grafting using bone particles harvested from resected vertebral body in treatment of lumbar spondylolisthesis.Methods Fifty-six cases of lumbar spondylolisthesis treated from June 2005 and June 2006 were reviewed retrospectively.According to Meyerding classification,35 cases were classified as grade Ⅰslippage and 21 cases as grade Ⅱ slippage.There were 19 spondylolisthesis at L4/5 and 37 at L5-S1.After posterior pedicle screw reduction and fixation,decompressive laminectomy and massive autologous bone grafting using particles of resected vertebral body,surgical outcome was analyzed.Results All cases achieved bone fusion without evidence of nail breakage or nerve injury.According to Macrab criteria,the results were excellent in 53 cases and good in three.Moreover,both the full reduction rate and interbody fusion rate were 100％.Conclusion Posterior pedicle screw reduction and fixation,decompressive laminectomy plus massive autogenous bone grafting is one of the ideal treatments for lumbar spondylolisthesis,for it achieves satisfactory fixation,decompression,reduction and fusion.

Objective To evaluate the effect of dexmedetomidine on the efficacy of patient-controlled intravenous analgesia (PCIA) with morphine after elective radical gastrectomy. Methods One hundred and twenty ASA Ⅰ or Ⅱ patients aged 41-64 yr weighing 50-80 kg undergoing elective radical gastrectomy were randomly divided into 2 groups of 60 patients, according to the composition of PCIA solution:group I morphine (group M)and group Ⅱ morphine + dexmedetomidine (group MD). In group M the PCIA solution contained morphine 100 mg in 200 ml of normal saline (NS), while in group MD the PCIA solution contained morphine 100 mg+dexmedetomidine 200 μg in NS 200 ml. PCIA was started immediately after operation. A loading dose of 6 ml was given iv at the end of operation. PCIA setting was as follows:background infusion 1 ml/h, bolus dose 3 ml and lockout interval 10 min. VAS score was maintained at ≤4 and Ramsay score at 2-3. The total amount of morphine consumed, the number of attempts and successfully delivered doses within 24 and 48 h after operation were recorded. Postoperative complications including nausea, vomiting, bradycardia, hypotension, oversedation and respiratory depression were recorded. Results The total amount of morphine consumed, the number of attempts and successfully delivered doses within 24 and 48 h after operation were significantly smaller and the incidence of nausea and vomiting and pruritus was significantly lower in group MD than in Sroup M. No bradycardia,hypotension, oversedation or respiratory depression was observed in either group. Conclusion Dexmedetomidine added to intravenous morphine PCA can improve the analgesic efficacy after radical gastrectomy with less adverse effects.

Background The penetration of bacterial agents into the vitreous cavity is difficult because of the existence of blood-retina barrier.So conventional drug therapy is not enough effective on endophthalmitis.Drug delivery systems can decrease drug dose and reduce the drug toxicity.To construct nano controlled-release system of anti-bacterial agents is very important for the treatment of intraocular infectious diseases.Objective This study was to investigate the toxicology and intraocular pharmacoklnetics of intravitreal PNIPAAm-PEO loaded norvancomycin nanoparticles (NV-PNIPAAm-PEO) in normal rabbit eyes.Methods NV-PNIPAAm-PEO was constructed with the drug-loading rate about 22％,and then the drug gelatin solution (20 g/L) was prepared using normal saline solution.Forty-one New Zealand albino rabbits were randomized divided into experimental group and control group.20 g/L drug gelatin solution 0.1 ml was monocularly injected into the vitreous cavity in the experimental group,and the equal volume of sterilized normal saline solution was used in the control group.In 1 day,2,3,7,14,21 and 28 days after injection,ocular anterior and posterior segments were examined by slit lamp microscope and Bsonography,and electroretinogram (ERG) was recorded and the histopathological examination was performed to evaluate the biotoxicity of the drug.Norvancomycin contents in the cornea homogenate,aqueous humor,vitreous,retinochoroid homogenate were detected by high performance liquid chromatography (HPLC) system.Results The anterior and posterior segments were normal by the slit lamp microscope and B-sonography 1-28 days after injection of NV-PNIPAAm-PEO.In 7,14,21 and 28 days after injection,there were no statistically significant difference in the a-wave latency and amplitude of max-ERG between the two groups,as well as the b-wave amplitude(P＞0.05).The histopathological examination showed that the retinal structure was normal in both groups.HPLC assay showed that the norvancomycin level was gradually declined in different eye tissues from 1 day through 28 days after injection.Norvancomycin was undetectable in the cornea during the observing duration.The maximal norvancomycin content in the blood plasma was (0.34 ± 0.11) mg/L in the second day,and norvancomycin content ranged (0.08 ± 0.04)-(2.16±0.07) mg/L in the aqueous humor,(0.11 ±0.22)-(2.54 ±0.38) μg/g in the chorioretina,respectively.The drug concentration was (5.65 ± 1.14)-(406.69 ± 21.05) mg/L in the vitreous,which was higher than the minimal inhibitory concentration (MIC) to the most gram-positive bacteria.Conclusions The intravitreal injection of 22％ NV-PNIPAAm-PEO maintains the therapeutic drug concentration till 21 days in vitreous without the toxic effect on eye tissues,suggesting a great treating potential for intraocular infecting diseases.