Humans ; Lead ; urine ; Lead Poisoning ; diagnosis ; urine ; Spectrometry, Fluorescence ; methods ; Spectrophotometry, Atomic ; methods

The article introduced the recent progress of tissue-engineered trachea.The problems encountered in the field and the study direction in the future are also mentioned.

Objective To investigate the relationship among early parenchymal enhancement,post- gadolinium(Gd)hyperintense middle cerebral artery(HMCA),and subsequent hemorrhagic transformation (HT)in patients with hyperacute ischemic stroke.Methods Twenty-four consecutive patients with ischemic stroke who underwent MRI within 6 h[(4.3?1.4)h]of symptom onset were retrospectively reviewed.All of these patients underwent at least one follow-up MRI or non-enhanced CT study at 2 to 7 days.Post-Gd T_1WI were analyzed for parenchymal enhancement and hyperintense MCA.Gradient echo MRI and CT were used for assessment of HT.Results Ten patients developed HT on follow-up imaging (hemorrhagic group).Early parenchymal enhancement was found in 6 patients with HT(P

Objective To investigate the role of peripheral blood lymphocyte apoptosis through Fas/ Fas ligand pathway in the development of viral myocarditis. Methods Twenty-five viral myocarditis (VMC) and 25 healthy children were chosen for study. The apoptosis percentage in peripheral blood iymphocytes was quantitatively examined, flow cytometry with Annexin V/PI double parameter was used. And the expressions of Fas and Fasl protein in peripheral blood lymphocytes were analyzed with flow cytometry. Results The percentage of apoptosis in peripheral blood lymphocytes in children with VMC [(0. 6976 ± 0. 1109)%] was significantly higher than that of healthy children [(0. 1288 ± 0. 1069) %] (t = 18.459, P ＜ 0.001). Moreover, the apoptosis cell percentage showed a significant positive correlation with the serum levels of myocardium enzyme (creatine kinase-MB, lactate dehydrogenase, creatine kinase, hydroxybutyrate dehydrogenase)(r =0. 817 ,P ＜0. 01 ;r =0. 785 ,P ＜0.01 ;r =0. 726 ,P ＜0. 01 ;r =0. 712 ,P ＜0. 01). The expression of Fas and Fasl protein in VMC patients(2. 8804 ± 0. 3020,4. 4496 ± 0. 4836) were higher than those of health children(2. 1300 ±0. 6200,0. 1238 ±0. 0384) ,which had significant difference(t = 17. 321 ,P ＜0. 001 ;t' =44. 577, P ＜ 0. 001). The apoptosis percentage of peripheral blood lymphocytes in children with VMC showed a significant positive correlation with the Fas and Fasl protein expression in peripheral blood lymphocytes(r =0. 972, P ＜ 0. 01; r = 0. 958, P ＜ 0. 01). Conclusion Apoptosis percentage of peripheral blood lymphocytes increases among children with VMC, probably because immune response decreased or it is related with the degree of myocardium damaged. Fas and Fasl play an important role in apoptosis of peripheral blood lymphocytes in children with VMC.

Objective To observe the difference in anticoagulant ability of endothelial cells from different sources.Methods Bone marrow mesenchymal stem cells(BMMSCs)were cultured,purified,and expanded by Ficoll-Paque density gradient centrifugation and adherent culture in vitro.Then they were induced and differentiated in medium with 10 ?g/L VEGF.After 7 days,Von Willebrand factor(VWF)of the cells were identified by immunohistochemistry.At last,the major anticoagulant gene expression of the vascular endothelial-like cells derived from BMMSCs and the human umbilical vein endothelial cells(HUVECs)was detected and compared by reverse transcriptase PCR(RT-PCR).Results Though BMMSCs can successfully differentiate into vascular endothelial-like cells in vitro,they fail to express mRNA of the major anticoagulant gene.However,HUVECs can express the mRNA of these genes.Conclusion BMMSCs can differentiate into vascular endothelial-like cells in vitro,but their anticoagulant ability is inferior to HUVECs.

AIM:Repair of trachea is disturbing the surgeon. Tissue engineering technology will probably resolve this problem. Seed cell is one of the key factors in engineered tracheal cartilage construction. This study investigated the feasibility of constructing tissue-engineered cartilage from porcine bone marrow mesenchymal stem cells(MSCs) cultured and induced in vitro using tissue engineering technique. METHODS:The experiment was performed in the Central Laboratory of Peking Union Medical College Hospital between October 2006 and May 2007. ①By density gradient centrifugation,the MSCs were isolated and purified from porcine bone marrow. The MSCs had been cultured and induced in the defined medium mainly including transforming growth factor-?1,and then the type Ⅱ collagens were detected by immunohistochemical assay. The induced MSCs were seeded onto polyglycolic acids(PGA) scaffold as experimental group,and PGA scaffold were implanted into subcutaneous tissue as control group. The cell-scaffold construct was wrapped around a silicon tube(0.4 cm in diameter) and implanted into subcutaneous tissue of porcine. All specimens were harvested after in vivo culture for 6,8 and 10 weeks and evaluated by gross view,histology,and immunohistochemistry. RESULTS:①The MSCs were obtained by density gradient centrifugation method,and abundant seed cells were obtained after culture and amplification. ②The MSCs differentiated towards chondrocyte when cultured in the specific medium in vitro and were verified by the positive result of collagen type Ⅱ through immunohistochemistry. ③After implanted into subcutaneous tissue for 6,8 and 10 weeks,the cell-scaffold formed a tubular cartilage,which was very similar to normal porcine tracheal cartilage in both gross view and histology. And the result of collagen type Ⅱ through immunohistochemistry was positive. CONCLUSION:The in vivo and vitro cultured MSCs from porcine bone marrow can generate tissue-engineered cartilage under chondrogenic induction.

Objective To study clinical manifestations, diagnosis, treatment, as well as effect of surgical operation, of primary mediastinal large B-cell lymphoma (PMBCL).Methods Data of 19 patients of PMBCL with complete clinical and pathological records hospitalized at Peking Union Medical College Hospital during 1998 to 2008 were retrospectively reviewed and analyzed.Kaplan-Meier method was used to estimate their survival time and survival rate in comparison of efficacy in those with surgical operation to those without it.Results Overall three-year survival rate was 54% for all the 19 patients, 55% for those with surgical operation and 54% without it, respectively, with an average survival time of 44 months, 44 months for those with surgical operation and 42 months without it, respectively, but not reaching at statistical significance.Symptoms of superior vena cava syndrome in five cases at admission relieved immediately after surgical operation, but symptoms of superior vena cava syndrome in three of nine cases in non-surgical group relieved gradually one to three weeks after chemotherapy.Conclusions Surgical operation has no significant effect on survival in patients with PMBCL, but it can relieve syndrome of superior vena cava syndrome and provide accurate pathological diagnosis.

Objective To investigate the value of serum?-human chorionic gonadotropin(?-HCG) and progesterone monitoring in medicinal conservative treatment for ectopic pregnancy. Methods Sixty patients with ectopic pregnancy treated with methotrexate were divideded into group A(n=39,?-HCG0.05).The time of serum progesterone level declining to normal level was significantly shorter than that of ?-HCG in both group A and group B(P

Objective To study the effects of traditional Chinese medicine Zuojin Pill on gastrointestinal system.Methods Through ig giving 0.1％ methyl orange solution,the gastric residual rate was calculated,and the effect of Zuojin Pill on gastric emptying in mice was observed.By ig administration of 5％ carbon powder,the advance rate of carbon powder was calculated,and the effect of Zuojin Pill on intestinal motility in normal mice and the antagonistic effect on intestinal motility hyperfunction induced by neostigmine were observed.Effect of Zuojin Pill on contraction of isolated guinea pig ileum induced by histamine was observed.After D-xylose solution was ig given to rats,the serum xylose level was determined 1 h later,and the effect of Zuojin Pill on rat intestinal absorption was observed.The anti-diarrhea effect of Zuojin Pill was observed by giving castor oil to mice.At the same time,we have made a comparison between Zuojin Pill and Wuji Pill-berberine,to evaluate the rationalization of Zuojin Pill.Results It was obvious in experimental results that Zuojin Pill had a regulating effect on gastrointestinal system.Zuojin Pill dose-dependently inhibited the gastric emptying.Zuojin Pill demonstrated more effective suppression on the accelerated movement induced by neostigmine,but did not inhibit normal intestinal transit in mice.Zuojin Pill markedly inhibited sperm motility in mice.Zuojin Pill concentration-dependently inhibited the contraction intensity of isolated ileum muscles in guinea pigs induced by histamine.Zuojin Pill markedly inhibited diarrhea induced by castor oil.Compared with Wuji Pill-berberine,the effect of Zuojin Pill on gastrointestinal system was more visible in the same dose.Conclusion Zuojin Pill has obvious regulation effect on the gastrointestinal tract,there are indications that the application of Zuojin Pill to clinic is scientific and reasonable.

The implementation of the Malpractice handling Regulations, which has set new and higher demands on medical institutions and medical workers, will have a certain impact on hospital administration and patient care. Medical institutions and medical workers must be highly aware of this. The entire staff of each hospital must study the Regulations carefully and try to obtain an objective understanding of it. Management of medical institutions must be strengthened, weak links identified, measures formulated and regulations perfected. Medical workers ought to strive for better professional skills, and supervision and management of medical records ought to be intensified.