Objective To simulate the process of lag screw insertion on intact pelvises under guidance of conventional fluoroscopes or 2D and Iso-C3D computer-assisted navigations and evaluate the accuracy and practicability of the computer-assisted navigation. Methods Six dried intact adult pelvic specimens were selected and divided into three groups randomly. A total of 54 hollow screws were placed in bilateral pedicles of S1 and S2, anterior column of bilateral acetabulum, anterior column of bilateral acetabulum and pubic symphysis of intact adult dried pelvic specimens of three groups under guidance of conventional fluoroscopy, 2D and Iso-C3Dcomputer assisted navigations, respectively. The accuracy of the screw positions, the average operating time of each screw insertion and the average time of radiation exposure during the insertion of each screw were compared among three groups. Results There were significant differences in the accuracy of the screw positions, the average operating time and the average time of radiation exposure among three groups (P＜0.01). The navigation with Iso-C3D appeared to provide the highest accuracy and the shortest operating time of all guidance techniques. The mean operating time and the average time of radiation exposure of the conventional fluoroscope were the longest among three groups. The average time of radiation exposure of the 2D computer-assisted navigation was the shortest.Conclusions Iso-C3D computer-assisted navigation is the most accurate and expeditious means of all guidance techniques. The time of radiation exposure can be significantly reduced by both 2D and Iso-C3D computer-assisted navigations.

Objective To investigate the correlation between methylation status of UNC 5C gene promoter with colorectal cancer UNC5C .Methods 54 cases of sporadic colorectal cancer and related normal mucosal tissue ,as well as 6 colon cancer cell lines and fiber cell lines(FCL) in the oncology department of the Kailuan General Hospital from February 2010 to March 2013 were selected as the research objects and performed the mRNA and methylation analysis for exploring the correlation between the netrin‐1 receptor UNC5C defects with colorectal cancer disease .Results mRNA of UNC5A and UNC5B was expressed in the detected colorectal cancer cell lines .Except FCL for UNC5C ,all of the cancer cell lines had no mRNA expression .In colorectal cancer tissue , UNC5C methylation was significantly higher than that in the normal mucosa ,the difference was statistically significant (P<0 .05) . The methylation levels of UNC5C gene in the stage Ⅰ to Ⅱ ,and the stage Ⅲ to Ⅳwere significantly higher than non‐methylation levels ,the differences were statistically significant (P<0 .05) .The correlation analysis by the Spearman method showed that the UNC5C defects was positively correlated with colorectal cancer disease (r= 0 .856 ,P< 0 .05) .Conclusion Netrin‐1 receptor UNC5C defect has certain correlation with colorectal cancer disease .

Intraductal papillary mucinous neoplasm (IPMN) is a kind of epithelial neoplasms of mucin-producing cells arising in the main duct and/or branch ducts of the pancreas,and it is one of the precancerous lesions of the pancreatic cancer.With the development of pathology and radiology,the diagnostic rate of IPMN has been gradually increased and given a new understanding on the pathological characteristics,clinical diagnosis and treatment of IPMN.This review overviewed the classification,diagnosis,management and prognosis of IPMN,aiming to deepen the understanding of IPMN and improve the level of diagnosis and treatment.

To observe the feasibility of ultrasonography as guide of ultrasound thrombolysis for treating lower limb arteriosclerosis obliterans.Methods: Fifteen cases of lower limb arteriosclerosis obliterans were treated with intravascular ultrasound thrombolysis.The whole processes were guided by ultrasonography.Results: Ultrasonography clearly showed the walls of the arteries,thrombus,artheromatous plaques and blood flow dynamics.It also showed on real time the structures,positions and work states of the catheter,guide wire and thromboltic probe during manipulation.It provided reliable surveillance and guide of ultrasound thrombolysis.All the obliterated arteries of the patients were successfully recanalized.Conclusion: Ultrasonography is a feasible means for surveillance and guide of intravascular ultraound theombolysis.

Objective To construct three-dimensional finite element model of lumbar spondylolysis,then to verify its validity by comparison of biomechanics in vitro.Method According to the radiological data of a patient with lumbar spondylolysis,the bone and intervertebral disc of L4-S1 were reconstructed by Simpleware software.The lumbar attaching ligaments and articular capsule were added into simulating model by Ansys software.The three-dimensional finite element model of lumbar spondylolysis was finally simulated successfully,and validated by lumbar spondylolysis biomechanical experiment in vitro.Results The reconstruction of digital model contained the bones of lumbar spine which include vertebral cortical bone,cancellous bone,facet joint,pedicle,lamina,transverse process and spinous process,as well as the annulus fibrosus,nucleus pulposus,superior and inferior end-plates.Besides,anterior and posterior longitudinal ligaments,flavum ligament,supraspinal and interspinal ligaments and articular capsule of facet joint are also attached.The model consisted of 281,261 nodes and 661,150 elements.Imitation of spondylolysis is well done in this model.The validity of the model was verified by comparison of the results of biomechanics in vitro which involved in the trends under loading of stress/strain of L4 inferior facet process,L5 superior and inferior facet process,S1 superior facet process and the trends of stress/strain of lateral and medial L4 inferior facet process.Conclusions Three-dimensional model of lumbar spondylolysis is reconstructed using finite element analysis,and can be further used in the research in biomechanics of lumbar spondylolysis.

Objective To explore the changes and effect of functional connectivity(FC) of reward network in chronic heroin addicts(HA) using resting-state fMRl(rs-fMRI). Methods rs-fMRI was performed on 26 chronic heroin addicts(HA group) and 25 matched normal volunteers(control group).The rs-fMRI data were proceeded by usingrs-fMRI(DPARSF) software on Matlab 2009a. Bilateral nucleus accumbens(Nacc) were set as ROIs. Then the mean time series of ROI were compared with other voxels within the brain by the rs-fMRI data analysis toolkit(REST). Intra-and inter-group analysis was performed with single sample and two sample t test respectively.The association of intensity of FC in brain regions and the duration/doses of heroin consumption was investigated. Results In HA group, positiveresting-state FC compared with the ROIs was found in frontal gyms, dorsal striatum, thalamus and pons, while temporal lobe, negative found in part of parietal cortex and occipital cortex, part of dorsal lateral prefrontal cortex and cerebellum. Within control group, positive FC compared with the ROIs was found in frontal gyms, dorsal striatum, thalamus, hippocampal gyrus and pons, occipital cortex, negative FC with ROIs found in part of dorsal lateral prefrontal cortex and cerebellum(P<0.005, voxels>26). Compared with the control group,the FC between the right Nacc and the bilateral calcarinegyrus, left middle occipital gyrus(voxel numbe r=31,28,47;t=3.99, 3.74,3.74;and P<0.005,respectively)were significantly increased in the HA group.The FC between the left Nacc and left fusiform gyrus and right precuneus(voxel number=40,26;t=3.77,3.57;and P<0.005, respectively)were significantly increased, while between the left Nacc and left dorsal medial/lateral prefrontal cortex and bilateral dorsal anterior cingulate(voxel number=98;t=-4.14;and P<0.005)were significantly decreased in the HA group. There was no corrlation between the abnormal FC and the duration/doses of heroin consumption in HA group(P>0.05). Conclusion The abnormal interaction between Nacc and the regions involved in cognitive control and visual spatial attention may contribute to the heroin addiction.

Objective To analyze the incidence of intracranial unruptured aneurysms in patients with internal carotid artery (ICA) stenosis (≥30％),the characteristics of aneurysms and risk factors in patients with ICA stenosis and intracranial aneurysm.Methods Clinical data of patients receiving digital subtraction angiography (DSA) at Peking University Third Hospital between January 2012 and June 2015 were retrospectively reviewed to identify patients with ICA stenosis and unruptured intracranial aneurysm.Results Among 247 patients with ICA stenosis,16 patients (6.5％) with intracranial unruptured aneurysms were found including 7 females and 9 males with age from 47 to 83 years old.The severity of ICA stenosis in aneurysm group was (85.3± 13.2)％,whereas it was (77.7± 17.9)％ in non-aneurysm group.The incidence of aneurysms in male patients with ICA stenosis was 4.5％ (9/202),and 15.6％(7/45) in female patients (P＜ 0.05).The incidence of aneurysms in patients with only in cervical segment (C 1 segment) of ICA was 4.4％ (10/226),whereas that of other segment was 28.6％(6/21) (P＜0.05).Logistic multivariate regression analysis showed that gender and stenosis location were independent risk factors of aneurysms in patients with ICA stenosis.Conclusions In patients with ICA stenosis,the incidence of aneurysm is much higher than that in general population.Intracranial aneurysms are more likely to occur in women and patients with ICA stenosis other than C 1 segment.

OBJECTIVETo prepare CIT microemulsion and to investigate its properities and the absorption character in rat intestine in situ.

METHODThe optimum formulation of the blank microemulsion was selected by pseudo tertiary phase diagrams and the CIT microemulsion was prepared based on the blank microemulsion. The appearance, particle diameter distribution and Zeta potential were investigated by electron microscopy and grainsize analyzer. The entrapment efficiency was determined by sephadex column chromatography. An in situ single pass intestine perfusion method was used to investigate the intestinal absorption of CIT microemulsion. HPLC method for determination of CIT in the intestinal flux was established.

RESULTThe formulation was OP-glycerol-water-ethylis oleas (3:3:4:2). CIT microemulsion in electron microscopy was consisted of small spherical drop. The mean diameter was 61.7 nm, Zeta potential was -46.3 mV. The Entrapment efficiency was (92.1 +/- 1.74)% (n=3). Both CIT and CIT microemulsion had been absorbed in general intestinal tract,and the absorption of CIT microemulsion was significantly high compared with CIT in duodenum, colon, jejunum and ileum (P < 0.01).

CONCLUSIONThe preparation technology of CIT microemulsion was feasible,and the microemulsion system might improve the absorption of CIT in the intestinal tract.

Animals ; Drug Compounding ; Drugs, Chinese Herbal ; chemistry ; pharmacokinetics ; Emulsions ; chemistry ; Intestinal Absorption ; Models, Animal ; Particle Size ; Rats ; Rats, Sprague-Dawley

Objective To assess the efficacy and safety of dl-3-butylphthalide on the treatment of acute ischemic stroke. Methods A total of 197 patients who were in the period of 72 hours of first attack of ischemic stroke of internal carotid artery with NIHSS from 5 to 25 scores were enrolled in this multi-center, randomized, double-blind and aspirin-control study. Compound " Dan Shen" was used as a baseline therapy. Results Basical recovery plus significant improvement was seen in 74.7% of the patients in dl-3-butylphthalide group and 60.9% in aspirin group (CMH value 4.0,P=0.047);There was a significant improvement for dl-3-butylphthalide group regarding NIHSS total score, total score difference value and Barthel index on the day 11th and 21st after treatment compared with control group. The main adverse reaction of dl-3-butylphthalide was increased aminotransferase and mainly the slight increase of aspartate aminotransferase, by 4.34% and 0 respectively. Conclusion dl-3-butyiphthalide should be regarded as an effective and safe treatment for ischemic stroke and a treatment without severe side effects.

With the sulfate as the materials and NaOH as precipitator, Mn(0.4)Zn(0.6)Fe2O4 nanoparticles were produced, which are proved to be spinel Mn-Zn ferrite analyzed by X-ray diffraction(XRD). Their shapes are approximately global examined by transmission electron microscopy(TEM) and their average diameter is 50 nm measured with image analysis-system. The Curie temperature was measured and in vitro heating test in a alternating magnetic field was carried out. The results show that the Curie temperature is 105. 407 degrees C, While its magnetic fluid could rise to 43 degrees C - 47 degrees C due to different concentration in a alternating magnetic field. The result provide theoretical and practical evidence to select an appropriate material and concentration for tumor
Electromagnetic Fields ; Ferric Compounds ; chemistry ; Humans ; Hyperthermia, Induced ; instrumentation ; Manganese Compounds ; chemistry ; Metal Nanoparticles ; chemistry ; Microscopy, Electron, Transmission ; Neoplasms ; therapy ; X-Ray Diffraction ; Zinc Compounds ; chemistry