Air ; analysis ; Chromatography, Gas ; methods ; Methylene Chloride ; analysis ; Workplace

Adenocarcinoma ; metabolism ; pathology ; surgery ; Adult ; Choriocarcinoma ; metabolism ; pathology ; surgery ; Diagnosis, Differential ; Endometrial Neoplasms ; metabolism ; pathology ; surgery ; Female ; Humans ; Keratin-7 ; metabolism ; Mucin-1 ; metabolism ; Ovarian Neoplasms ; metabolism ; pathology ; surgery

Background Treatment of corneal ulceration by transplanting drug-loaded amniotic membrane has been used widespreadly abroad,however,seldom study is found in China up to now.Objective This study was to explore the sustained release property and the efficacy of the drug-loaded amniotic membrane.Methods The bacteriostatic area of amniotic membrane fragments immersed with different concentrations (5,20,30 g/L) of levofloxacin for different time points (5,15,30,60 minutes) was evaluated by in vitro test.Bacterial corneal ulceration models were established in 20 rabbits by injected 0.7 MCF staphylococcus aureus suspension (0.1 ml) into the central corneal stroma to form the cloudy area of 4.0-6.0 mm.Then the rabbits were randomized into two groups.Regular amniotic membrane transplantation was performed laterally and 0.5％ levofloxacin drops was topically administered after operation in the amnion+levofloxacin drops group,and drug-loading amnion transplantation was used in the drug-loading amnion group.Aqueous humor of 0.1 ml was collected in 30 minutes,1 hour,2,3.5,5.5 hours after levofloxacin was administered and 1 day,3,7,10,14,21 days after operation for the detect of levofloxacin level with high-performance liquid chromatography.The corneal symptom was scored based on McNeill's criteria in 1 week,2 weeks and 4 weeks and the ulceration area was assessed under the slit lamp in the first week.The pathological examination was carried out in the fourth week after surgery.Results The mean bacteriostatic area was bigger with the increase of levofloxacin concentration,and bacteriostatic area in amnion immersed for 15 minutes was bigger than that of 5 minutes (P＜0.01).The levofloxacin concentration of aqueous humor after transplantation was decreased by extending the time,and that in 30 minutes and 5.5 hours after operation was (0.873±0.264) mg/L and (0.106±0.027) mg/L,respectively,in the amnion+levofloxacin drops group,and that in day 1,3,7 after surgery in the drug-loading amnion group was higher than at 30 minutes in the amnion+levofloxacin drops group,showing all significant differences (all P =0.00).In the first,second and fourth week after operation,the corneal symptom score was 1.7±0.6,1.3±0.5,0.2±0.4 in the drug-loading amnion group and 2.2±0.8,2.0±0.6,1.5±0.8 in the amnion+ levofloxacin drops group,with the significant differences among the different groups and time points (Fgroup =9.49,P =0.01 ;Ftime =22.96,P=0.01).The corneal ulceration area was (1.6±0.6) mm2 in the drug-loading amnion group and (3.2±0.8) mm2 in the amnion+levofloxacin drops group 1 week after operation,showing a significant difference between them (t =3.98,P =0.00).Histopathological revealed that the various layers of cornea tissue appeared irregular arrangement in the amnion + levofloxacin drops group 4 weeks after operation with 1-2 layers of new squamous epithelium.Disorder hypothallus structure,more inflammatory cells and residual vascular cavity were visible.However,new squamous epithelium of 4-5 layers was seen in the drug-loading amnion group,and inflammatory cells and residual vascular cavity were less than the amnion+levofloxacin drops group 4 weeks after operation.Conclusions Levofloxacin-loaded amniotic membrane can sustained release levofloxacin and maintain an effective drug concentration in aqueous humor,which improves the treating efficacy for staphylococcus aureus corneal ulceration.

Objective:To investigate the effect of Vitapex paste in the root canal for deciduous teeth with chronic apical periodontitis.Methods:200 children with chronic apical periodontitis were selected and divided into two groups.The observation group (108 cases)was given Vitapex paste.The control group (92 cases) was given Zinc oxide iodoform paste.The effect of Vitapex paste in root canal for deciduous teeth with chronic apical periodontitis was evaluated by filling quality after 1 month'treatment,the VAS scores before and after treatment,long-term curative effect were compared between two groups.Results:After 1 month'treatment,the suitable filling rate of observation group was higher than that of the control group(P＜0.05).There was no statistical significance in the VAS scores between two groups (P＞0.05).After 1 week'and 1 month'treatment,the pain feeling were alleviated in two groups and significantly lighter in the observation group(P＜0.05).After 6 months' follow-up,the success rate was 96.3％ in the observation group and 87.0％ in the control group,the success rate of observation group was higher than that of the control group (P＜0.05).Conclusion:The filling process of Vitapex paste was simple and easy,which had a good therapeutic effect on chronic apical periodontitis of deciduous teeth and could relieve the toothache of patients.

Purpose:To discuss the MRI features and differential diagnosis of hemangioblastomas in the central nervous system.Materials and Methods: The MRI features of 22 patients with hemangioblastomas confirmed histopathologically were analyzed retrospectively.Results: In this group there were 50 lesions in 22 patients.Multiple lesions were revealed in 5 cases.The lesions located in the cerebellar hemisphere and vermis ( n = 40),medulla oblongata and spinal cord ( n.= 9 ),cerebral hemisphere ( n = 1).Among the 50 lesions,12 appeared as a large cyst with mural nodule,36 as a solid mass,2 as a simple cyst.Of large cyst with mural nodule lesions,the content of the cyst was hy-pointense signal on T1WI,and hyperintense signal on T2WI.The mural nodules were slightly hypointense signal or isointense signal on Tl WI,and hyperintense signal on T2WI.The solid masses were isointense signal on Tl WI,slightly hyperintense signal and hyperintense signal on T2WI.On contrast enhanced scans,all mural nodules and solid tumors were showed marked homogeneous enhancement.On PWI the mural nodules and solid tumors were demonstrated marked hyperperfusion.Conclusion:Hemangioblastomas have distinctive manifestation,MRI enhanced scans and PWI play an important role in the diagnosis and differential diagnosis of hemangioblastomas.

Objective To observe left ventricular transmural peak radial strain and strain time-to-peak of peri-infarct different layers myocardium using tissue Doppler strain imaging, to assess its mechanical pattern during acute myocardial ischemia.Methods Left anterior descending coronary artery (LAD) were ligated in experimental open-chest Beagle dog models (n = 9),the two-dimensional apical short-axis views of left ventricle in three complete cardiac cycles were acquired and stored in TDI-Q workstation at baseline(the control group of peri-infarc myocardium) and during acute myocardial ischemia respectively.Sampling volume was uesd to measure the peak radial strain and the strain time-to-peak consesquently on the derived M -mode tissue Doppler velocity images at peri-infarct myocardium before and after ischemic segments and different layers(subendocardium, medium, subepicardium).Statistical analies was performed using student's t- test or Pearson's correlations.Results Peak radial strain decreased at peri-infarct subendoeardium (P<0.05) with no significant difference between those at baseline and at peri-infarct medium (P >0.05), the peak radial strain increasd at peri-infarct subepieardium (P < 0.05) ,and the strain time-to-peak at different layers of peri-infarct myoeardium was significantly postponed (P< 0.05).There was a good correlationship of peak radial strain between subendocardium and segment as well as between the medium and segment (r = 0.617, P<0.01 ; r = 0.556, P<0.01).This correlationship disappeared at peri-infarct myocardial segment (r = 0.287, P > 0.05, r = 0.243, P > 0.05).Conclusions The left ventricular transmural mechanical remodeling at peri-infarct myocardium is the integrant of result of mechanical interactions between ischemic and nonischemic myocardium,which might be one of the trigger the structural and fundational remodeling processes involving in the pathophysiological foundation of ischemie cardiomyopathy.

Objective To investigate the relationship between retinal nerve fiber layer thickness and peripheral neuropathy in elderly patients with type 2 diabetes.Methods Clinical data of elderly patients with T2DM in Endocrinology Department in Beijing Hospital were retrospectively collected.Global and sectorial retinal nerve fiber layer(RNFL)thicknesses were measured by using optical coherence tomography(OCT),and never conduction velocity measurements were performed in all patients.Diabetic peripheral neuropathy was diagnosed by the criteria in diabetic neuropathies update(2010,American Diabetes Association).RNFL thickness was compared between diabetic nonperipheral neuropathy group (control group,n =30)and diabetic peripheral neuropathy group (DPN group,n=17)and between different sub-groups.Results The RNFL thicknesses of temporal,nasal,superior and inferior visual fields and the mean RNFL thickness were less in DPN group than in control group,among which there were significant differences in the RNFL thicknesses of superior,inferior visual fields and the mean RNFL thickness [(107.7±27.4)μm vs.(128.1±17.3)μm,(112.9 ±20.8)μm vs.(130.8±21.8)μm,(88.2±15.5)μm vs.(100.5± 11.3)μm,F=7.446,7.468,7.988,respectively,P=0.009,0.009 and 0.007].RNFL thickness was decreased along with the aggravation of DPN from the control group,the subclinical DPN group to the DPN group successively(all P＜ 0.05).Conclusions Retinal nerve fiber layer thickness is associated with diabetic peripheral neuropathy in elderly patients with type 2 diabetes,and the relationship is more significant in patients with serious DPN.

Objective To study the effects of phycocyanin on the expressions of matrix metalloproteinase 2 and 9(MMP-2 and MMP-9) after focal cerebral ischemic reperfusion in rats.Methods A rat middle cerebral artery occlusion/reperfusion(MCAO/R) model was built up using the intraluminal filament method and treated by phycocyanin.The brain water content(BWC) was calculated with dry-wet method and the Evans blue(EB) of the brain was measured with the method of colorimetry.The expressions of MMP-2 and MMP-9 were determined by immunohistochemical assay.Results The BWC and EB of the brain increased after cerebral ischemic reperfusion and peaked at reperfusion 2d,and decreased after applying phycocyanin.In control group,the upregulation of MMP-2 began at ischemic reperfusion 24h,reached a maximum at 3～7d,then subsided gradually,but was still in high level at 14d.In phycocyanin group,the expressing time-phase pattern of MMP-2 was similar to and significantly lower than that in control group at same time.In control group,the upregulation of MMP-9 began at ischemic reperfusion 6h,increased at 12h and reached a maximum at 2d,then subsided gradually at 3d to sham group level at 14d.In the phycocyanin group,the expression of MMP-9 was significantly lower than that in control group,and the time-phase pattern of MMP-9 was similar to that in control group.Conclusions Phycocyanin might play an neuroprotective effect by down regulating the expressions of MMP-2 and MMP-9 to reduce brain edema after cerebral ischemic reperfusion.

Objective To investigate the effects of low-frequency repetitive transcranial magnetic stimulation (rTMS) on post-stroke disfunction of cognition and memory by stimulating right dorsolateral prefrontal cortex. Methods 40 patients were randomized into the rTMS (n=19) and sham (n=21) groups. The function of cognition and memory were measured before treatment, after treatment and 2 months post-treatment with Montreal Cognitive Assessment (MoCA), Loewenstein Occupational Therapy Cognitive Assessment (LOTCA) and Rivermead Behaviour Memory Test (RBMT). Results All scores improved in both groups after treatment and 2 months post-treatment (P< 0.001), and improved more in the rTMS group than in the sham group (P<0.01). Conclusion Low-frequency rTMS may improve the function of memory and cognition after stoke.

Objective To analyze the influence of diabetes mellitus (DM) on the outcomes of percutaneous transluminal angioplasty (PTA) with stenting of femoropopliteal artery,in patients with atherosclerotic occlusive disease (ASO).Method Clinical data of inpatients who successfully received PTA with stenting procedures of femoropopliteal artery in Xuanwu Hospital from January 2006 to December 2012 were analyzed retrospectively.Patients were stratified into DM and non-DM groups.Results were compared between the two groups including primary patency (PP),assisted patency (AP),limb salvage and survival using Kaplan-Meier life table and Cox regression analyses.Result Totally 291 patients underwent 332 procedures.There were 214 DM and 118 non-DM limbs.Mean follow-up was 34 months.The 5-year PP was 23.2％,AP was 35.3％,limb salvage was 89.2％,and survival was 69.6％.DM was associated with lower 5-year PP,limb salvage,and survival than non-DM.But there were no significant difference in AP between the two groups.Females were associated with decreased PP than males on Cox multivariate analysis.Hypertension and below tibial diseases were associated with lower limb salvage rate and age is the only predictor of survival rate.Conclusions DM is a risk factor for poor outcomes after PTA with stenting procedures.