Biomedical Research ; Child ; Humans ; Methyl-CpG-Binding Protein 2 ; metabolism ; Rett Syndrome

Objective To conduct a hiomechanical comparison of the four common internal fixation methods for the anterior eruciate ligament(ACL)avulsion fractures of displaced tibial eminence.Methods Sixteen fresh cadaver knee joints were used and randomized into four equal groups of four fixation methods:antegrade wiring group, retrograde wiring group,suturation group,and intramedullary screw group.The knee joint specimens were fixed at flexion of 30?and subject to continuous stretch stresses of 30 N,60 N and 90 N respectively on a material testing machine(MTS 858 Bionix test system,USA)which conducted a simulated Lachman test.The specimens were scanned at different angles by a three dimensional laser scanner.Data were recorded and processed by image software to es- tablish three-dimensional structure models of femur,tibia and knee joint.The test results were analyzed statistically on a computer.Results There were no obvious differences between each fixation group in the length change of ACL when the stresses were 30 N and 60 N(P＞0.05).Under 90 N stress,however,the mean length change between the femoral and tibial attachments of ACL was the smallest(4.8?1.7)mm(2.5 to 6.2 mm)in the suturation group(P＜0.05). There were no distinct differences between the intramedullary screw group and the retrograde wiring group in the changes of A CL shift(P=0.214).The average front shift in the retrograde wiring group was(6.2?1.2)mm(4.8 to 8.2 mm) and significantly smaller than that in the antegrade wiring group(P＜0.05).The antegrade wiring group made the largest average front shift under different stresses and its average front shift was(7.2?1.3)mm(5.6 to 8.7 mm). Conclusions The knee joint stability provided by the suturation fixation is distinctly better than that by the other three fixation methods.The antegrade wire fixation provides the poorest knee joint stability.There is hardly any difference between intramedullary screw fixation and retrograde wiring fixation.

Aged ; Angioplasty, Balloon, Coronary ; Heparin ; adverse effects ; Humans ; Male ; Thrombocytopenia ; chemically induced

AIM: To detect surface electromyogram (EMG) signal accurately.METHODS: How to reduce noise in the detection of surface EMG signal was discussed. It has been explored to design an electrode unit by using methods of differential amplification, active electrode, filter and so on , andto investigate the electrode shape and the right placing method.RESULTS: The instrumentation amplifier AD620 was adopted to design a bipolar active electrode, which has been successfully used in the surface EMG detection.CONCLUSION: Experiments show that using active electrode can improve ratio of signal and noise, reduce noise and detect surface EMG signal effectively.

Objective To analyze the potential risk factors of infantile spasms (IS) relapse through following up the respondents with IS after different treatment protocols.Methods Sixty-nine cases were collected in the Department of Pediatric Neurology,Jiangxi Children's Hospital from May 2011 to September 2013,who had complete cessation of spasms for at least 28 days or more after the different treatment protocols.The follow-up was performed on these patients until spasms seizure relapse or at least 1 year for those without recurrence.According to the literature review,8 possible risk factors of IS recurrence (gender,age of onset,course of diseases,etiology,high irregular types of electroencephalogram,development quotient,onset time,treatment protocols) were selected,and then Logistic multiple regression was used to analyze the relationship of various potential risk factors with the relapse of spasms.Results (1) The recurrence rate at 6 months and 12 months were 40.6％ (28/69 cases)and 43.5 ％ (30/69 cases),respectively.(2) Among the various potential factors,the age at onset and the time to response were closely related to the IS recurrence.Namely,the non-classic onset(early-onset and late-onset) of IS were more likely to relapse than the classic onset[66.7％ (14/21 cases) vs 33.3％ (16/48 cases),x2 =6.605,P =0.010];the responders beyond 1 week were more likely to relapse than those within 1 week[63.6％ (14/22 cases) vs 34.0％ (16/47 cases),x2 =5.341,P =0.021].There were significant differences between the 2 groups (all P ＜ 0.05).(3) Logistic multiple regression analysis demonstrated that age at onset (Wald =3.603) was most closely related to the relapse of spasms.Conclusions (1) The relapse rate of IS in children was high,and the majority of them relapsed within 6 months.So a long-term,rational and effective clinical management solution should be explored.(2) The age at onset and the time to response are very important risk factors of the IS recurrence,and the former was more significant.So,early diagnosis and early treatment are more likely to improve the efficacy of IS,and reduce the risks of recurrence and improve the prognosis.

A simple and rapid method was established for the determination of the content of L-malic acid in fermentation liquor. This procedure includes six steps: (1) Use a microi- njector to inject the fermentation liquor quantitively on the filter paper, then use the chromatography solution (n-butanol: formic acid: water=8:1.5:1) for paper chromatography. (2) Atomize the display reagent (10ml 0.02?10~(-2) bromocresol green: 0.2ml 10?10~(-2) sodium hydroxide) on the chromatography paper. (3) Scissor off L-malic acid spots from the paper and put in into 5 ml distilled water for three hours. (4) In 1ml eluent, add 6 ml 96?10~(-2) sulphuric acid and 0.1ml 1.0?10~(-2) ?-naphthol.(5) Heat the reaction system in 100℃ water for sixty minutes. (6) After cooling determine the optical density at the wavelength 476 am in the colorimeter.

Objective To evaluate the clinical safety and efficacy of HIFU treatment of hepatic metastases from colorectal cancer.Methods 20 tumor lesions in 14 patients with hepatic metastases from colonectal cancer were treated with HIFU therapy.The vital signs,main organs'functions,examination of MRI and complications were observed.Results Vital signs of all the 14 patients were stable.The function of liver and kidney were normal and life quality were improved with elevation of Karnofsky in 5 patients.On MRI examination,the MRI signals of treating area of 20 tumor lesion in 14 patients decreased remarkably with disappearance of blood supply and a thin layer of edematous intensified zone was detected on the margin of lesion.6 patients were found to have cord-like burning scar on skin.Conclusion HIFU treatment is safe and effective in treatment of hepatic metastases from colorectal cancer.

Objective To investigate the effects of the silence of teratocarcinoma-derived growth factor-1 ( TDGF-1 ) gene on invasion of human pancreatic cancer cell. Methods Three small interfering RNA (siRNA) targeting for TDGF-1 genes (S1, S2, S3 ) were designed and established, then the gene with the best silencing effects was screened. Human pancreatic cancer cell line PANC1 were transfected by siRNA with different concentrations (3. 125, 6.25, 12.5 nmoL/L), the cells without transfection, and simply treated with liposomes were controls. The expressions of mRNA and protein of TDGF-1 were determined by real time PCR and Western blot assay, respectively. The anchorage-independent growth was examined by clon formation in soft agar, and invasion ability was evaluated by boyden chamber model. PANC1 cells with transfection for 48h were injected into the nude mice to evaluate the invasion ability in vivo. Results The expressions of TDGF-1 mRNA and protein of cells transfected by siRNA were decreased in a dose-and time-dependent manner, which were significantly lower than those in liposomes group. Number of colony formation and transmembrane cell were 19.8 ± 2.2 and 49.8 + 2.6 in the control group, and 5.6 + 1.2 and 8. 1 + 1.1 in the 12.5 nmol/L transfection group. The volumes of tumor 4 weeks after transplation in the control group, liposomes group and the 12.5 nmol/L transfection group were (2.228 ± 0.016 ) cm3, ( 2.186 ± 0.028 )cm3 and ( 0.728 ± 0.023 )cm3. Conclusions TDGF-1 gene silence could inhibit invasion ability of human pancreatic cancer cell PANC1.

Objective To identify the typical imaging features of steatocystoma multiplex on mammography.Methods Mammographic findings in 9 patients with clinical and pathological diagnosis of steatocystoma multiplex were analyzed along with a review of the current literature.Results Four of the nine patients with steatocystoma multiplex had a positive family history.Nine patients showed multiple,round,thin-walled fatty,radiolucent nodules with well-defined margin.These nodules are located in the superficial layer of the axilla bilaterally.They are also seen on the skin of breast(7 cases),the anterior chest wall (4 cases) and the upper arm (3 cases).Conclusion Recognition of the characteristic mammographic features of Steatocystoma multiplex is important in the management of these patients.

Objective Aortic dissection is accute in occurrence along with fast change , which is inclined to to induce psy-chotic symptoms and affect the lives of patients .The study was to investigate the effects of healthcare cooperative intervention on pa-tients with psychiatric symptoms secondary to aortic dissection . Methods We established medical cooperation organization structure to clarify the division of responsibility along with a quick assessment form , a process chart and a green channel for emergencey treat-ment.The above method was applied to intervene 32 patients with psychiatric symptoms secondary to aortic dissection and observe the diagnosis time , the time from diagnosis to surgery , the remission time of psychiatric symptoms , the incidence of adverse events and the length of stay. Results 32 patients were diagnosed within 30min followed by emergency surgery within 30min after diagnosis, which was 1-2 hours shorter than the previous diagnosis and surgery preparation time .5-21 d after surgery , psychiatric symptoms have been effectively controlled.Extubation, falling out of bed, self-injury or injury and other adverse events did not occur .No patient died, and the average length of stay was 13.5d, which was 1.75d shorter than the length of stay of previous similar patients . Conclusion The healthcare cooperation method can quickly identify patients with psychiatric symptoms secondary to aortic dissection , prevent adverse events and shorten the length of stay .