Objective To discuss the feasibility,indications,surgical techniques,and outcome con- cerning the application of less invasive stabilization system (LISS) for complex proximal femoral fractures.Methods We treated 12 complex proximal femoral fractures using femoral LISS reversely from June 2005 to May 2006. They were five complex intertrochanteric fractures and seven subtrochanteric ones.By AO classification,two were type 31-A2.2,two type 31-A2.3,one type 31-A3.3,one type 32-A3.1,three type 32-B1.1,one type 32-B2.1, and two type 32-B3.I.The patients were treated with closed or indirect reduction and fixation with percutaneous LISS plate reversely.Results There were no major postoperative complications in this study.The mean operation time was 65 minutes (range,50 to 90 minutes),the mean intra-operative blood loss was 142 milliliters (range,50 to 400 milliliters),and the mean postoperative hospital stay was 9.3 days (range,6 to 15 days).All patients had a clinical follow-up;the mean follow-up time was 7.2 months (range,3 to 14 months).Ten cases healed clinically three months postoperatively,one periprosthetic fracture healed four months and one pathological fracture healed six months after operation.At the final radiographic follow-up,no collapse,varus deformity,cutting-out,hardware failure,or avascular necrosis was found.Conclusions Femoral LISS used reversely can provide secure fixation for proximal femoral fractures biomechanically and anatomically.It is also easy and safe.It is particularly suitable for old patients with intertrochanteric fractures complicated with disorders of internal organs and severe osteoporosis or patients with complex proximal femoral fractures.It is important to be skillful in indirect reduction and positioning of guide wire into hole A,and to avoid immediate weight-bearing postoperatively.

ObjectiveTo enrich and quantitatively analyze peripheral circulative carcinoma cells by magnetic activated cell sorting (MACS) in colorectal cancer patients.MethodsBlood samples, preoperatively collected from 21 patients with colorectal cancer and 9 healthy volunteers, were labeled by anti-cytokeratin (CK) with magnetic microbeads, and passed through magnetic columns; CK +carcinoma cells were separated from the samples, and quantified by flow cytometry.ResultsCK +CD45 -cells could not be detected from the samples without MACS; in the sample undergoing MACS, the concentrations of CK +CD45 -cells were significantly higher in patient group than in control group(P

ObjectiveTo investigate the disruption of blood-brain barrier (BBB) after brain trauma in rats using IgG immunohistochemical staining.MethodsAn impact-acceleration head injury model was established with rats. Histological changes of rats' brains were observed by HE staining and light and electron microscopes at 1 h, 6 h, 24 h and 7 d after injury, and BBB permeability was analyzed semi-quantitatively by IgG immunohistochemical staining at the same time points.ResultsThe spot bleeding and brain edema was present in the damage region after brain trauma and endothelial cell damage and astrocyte swelling could be found under electron microscope. The extravasations of IgG was detected in the injured hemisphere of rats at 1 h, and achieved the peak at 6 h, remained a high level up to 24 h, and decreased at 7th d.ConclusionThe disruption of BBB function occurs after brain trauma in rats, and detection of IgG extravasations tested by immunohistochemical staining is a simple and sensitive way to investigate BBB permeability.

Objective To investigate the impact of overweight and obesity on left atrial (LA) function in healthy subjects with excess body weight.Methods Conventional echocardiography and tissue Doppler imaging were performed in 30 obese subjects (BMI≥28 kg/m2),30 overweight subjects (BMI,24to 28 kg/m2) and 30 age-matched normal subjects (BMI＜24kg/m2).Strain (S),peak systolic strain rate (SSR),peak early diastolic strain rate (ESR) and peak late diastolic strain rate (ASR) values were used to evaluating LA function.Results Compared with controls,mean S,SSR and ESR were decreased in obese subjects,while mean SSR,ESR and ASR were decreased in overweight subjects.Compared with overweight subjects,mean ESR was decreased in obese subjects.Conclusions An impaired LA function is found in overweight and obese subjects who has no other clinically appreciable cause of heart disease by using strain and SR imaging.

Objective To study the changes of diastolic function of left ventricle by tissue Doppler imaging (TDI) and the serum level of endocrine factors,and analyse the relations between these factors and mass or diastolic function of left ventricle in patients with essential hypertension.Methods Sixty one patients with essential hypertension were divided into left ventricular hypertrophy(LVH) group and no left ventricular hypertrophy(NLVH) group.Twenty healthy subjects were considered as control group.The early(e) and late(a) diastolic maximal myocardial velocity and e/a of lateral wall motion of mitral valve annulus were recorded by TDI.The levels of atrial natritic peptide(ANP),brain natriuretic peptide(BNP),endothelium(ET),calcitonic gene related peptide(CGRP) and insulin like growth factor 1(IGF 1) were measured by radio immunology analysis.Results The e wave maximal velocity in LVH group was lower than that of NLVH group and control group [( 14.56 ? 7.83 ) cm/s,( 16.40 ? 0.66 ) cm/s,( 18.68 ? 3.78 ) cm/s,respectively],and a wave maximal velocity in LVH group was higher than that of NLVH group and control group [( 18.28 ? 9.60 ) cm/s,( 16.03 ? 5.88 ) cm/s ,( 14.53 ? 1.28 ) cm/s,respectively]; The e and a maximal velocity velocities in both LVH and NLVH groups had statistic differences with those of control group(P

Objective To explore the risk factors in elderly type 2 diabetes mellitus with cerebral infarction. Methods Retrospective investigarion was performed on 148 elderly hospitalized patients with type 2 diabetes.The patients were classified based on the presence or absence of cerebral infarction and compared with 60 controls.Logis- tic regression analysis was used to reveal the risk factors for cerebral infarction.Results The levels of systolic blood pressure(SBP),body mass index (BMI),fasting blood glucose (FBG),total cholesterol (TC),triglyceride (TG) and plasma fibrinogen(Fg) were higher in the patients with cerebral infarction[141.15?17.46)mmHg,(23.81?3.53)kg/m~2,(8.82?2.81)mmol/L,(5.69?1.15)mmol/L,(2.08?0.75)mmol/L and (4.08?0.65)g/L] than those without cerebral infarction[(129.78?14.65) mmHg,(22.18?3.22)kg/m~2,(7.06?1.72 )mmol/L,(5.09?1.12)mmol/L,(1.62?0.43)mmol/L and (3.48?0.58)g/L].The logistic analysis showed COUR,SBP,FBG, TC,TG and Fg were the independent risk factors for cerebral infarction.Conclusion Early intervention of the inde- pendent risk factors including SBP,FBG,TC,TG and Fg in elderly patients with type 2 diabetes was important for reduction and postponement of cerebral infarction.

Child ; China ; Humans ; Paramyxoviridae Infections ; physiopathology ; Respiratory Tract Infections ; physiopathology ; virology

The AC impedance of human hepatoma SMMC-7721 cells were measured in our laboratory by Agilent 4294A impedance analyzer in the frequency range of 0.01-100 MHz. And then the effect of hematocrit on electrical impedance characteristics of hepatoma cells was observed by electrical impedance spectroscopy, Bode diagram, Nyquist diagram and Nichols diagram. The results showed that firstly, there is a frequency dependence, i.e., the increment of real part and the imaginary part of complex electrical impedance (δZ', δZ"), the increment of the amplitude modulus of complex electrical impedance (δ[Z *]) and phase angle (δθ) were all changed with the increasing frequency. Secondly, it showed cell volume fraction (CVF) dependence, i. e. , the increment of low-frequency limit (δZ'0, δ[Z*] 0), peak (δZ"(p), δθ(p)), area and radius (Nyquist diagram, Nichols diagram) were all increased along with the electric field frequency. Thirdly, there was the presence of two characteristic frequencies: the first characteristic frequency (f(c1)) and the second characteristic frequency (f(c2)), which were originated respectively in the polarization effects of two interfaces that the cell membrane and extracellular fluid, cell membrane and cytoplasm. A conclusion can be drawn that the electrical impedance spectroscopy is able to be used to observe the electrical characteristics of human hepatoma cells, and therefore this method can be used to investigate the electrophysiological mechanisms of liver cancer cells, and provide research tools and observation parameters, and it also has important theoretical value and potential applications for screening anticancer drugs.
Carcinoma, Hepatocellular ; Cell Line, Tumor ; Cell Membrane ; Cytoplasm ; Electric Impedance ; Electrophysiological Phenomena ; Humans ; Liver Neoplasms ; Membrane Potentials

Objective To investigate the effects of hypertension on left atrial myocardial properties by strain and strain rate(SR)imaging.Methods A total of 56 consecutive patients with hypertension were divided into 2 groups:33 with normal LVMI and 23 with left ventricular hypertrophy.These patients and 20 controls underwent transthoracic echocardiography,strain and SR imaging examination.Atrial strain and SR values of hypertensive patients were compared with those of controls.Results When compared with the controls,early diastolic SR(ESR)was significantly decreased in hypertensive patients(P＜0.01-0.001),with time to peak late diastolic SR corrected for heart rate(TASRe)significantly increased in normal LVMI subgroup(P＜0.05).Moreover,late diastolic SR(ASR)were significantly decreased(P＜0.05)in hypertensive patients with left ventricular hypertrophy as compared with normal LVMI.Conclusions Enlargement of left atrium leads to increased reservoir function in hypertensive patients,which compensates for the deterioration of conduit function.The duration of atrial systole may be prolonged to meet the need of ventricular filling in consequence of lower left atrial booster pump function.Noninvasive quantification of left atrial function by SR imaging enables evaluation of left atrial dysfunction due to hypertension.

Objective To discuss the selection of short- or long-segment posterior fixation for treatment of unstable thoracolumbar fractures. Methods A total 134 patients with thoracolumbar fractures treated with pedicle instrument fixation from January 2005 to December 2008 were studied retrospectively. According to AO fracture classification, there were 70 patients with type A fractures, 37 with type B and 27 with type C. The patients were divided into two groups according to the number of instrumented levels; short-segment posterior fixation (SSPF) group (four screws; one vertebral body above or below the fractured vertebrae) and long-segment posterior fixation (LSPF) group (eight screws; two vertebral bodies above or below the fractured vertebrae). Clinical outcomes and radiological parameters (superior-inferior endplate angle, vertebral body angle, displacement of vertebral body) were compared according to AO fracture classification. Results All type A fractures were treated with SSPF, mean superior-inferior endplate angle changed from preoperative 21.3° to postoperative 8.5° and 11.1° at final follow up. There was no statistical difference in the correction of Cobb angle for type B fractures in SSPF group (26 patients) and LSPF group (11 patients), while the correction loss of vertebral body angle was 3. 64° in SSPF group and 1.09° in LSPF group, with statistical difference (P < 0. 05). There was no statistical difference in the correction of Cobb angle for type C fractures in SSPF group (7 patients) and in LSPF group (20 patients), but the correction loss of vertebral body angle was 3.6° in SSPF group and 0. 8° in LSPF group, with statistical difference (P < 0. 05). There was no statistical difference in vertebral displacement correction. Conclusions Most types A and Bl fractures should be treated with SSPF; most types B2, B3 and C fractures should be treated with LSPF.