1.Treatment status of intracranial atherosclerotic stenosis
Changmin XU ; Li GAO ; Yumin LUO
International Journal of Cerebrovascular Diseases 2010;18(5):347-351
More than 2 million strokes occur in china each year,most of which are caused by cerebrovascular stenosis. Atherosclerosis is the main reason for cerebrovascular stenosis. The effective treatment of intracranial atherosclerosis can significantly decrease the incidence of stroke. However,at present,about the treatment of intracranial atherosclerotic stenosis has not been standardized. This article reviews about the treatment methods for intracranial atherosclerotic stenosis in recent years and provides the basis for the development of standardized treatment of intracranial atherosclerotic stenosis.
2.Clinical study on occlusal rehabilitation in elderly patients with abnormal occlusion
Yumin LI ; Ping GAO ; Kai YIN ; Changyi LI
Chinese Journal of Geriatrics 2009;28(4):283-286
Objective To evaluate the clinical effects and clinical classification of occlusal rehabilitation in elderly patients with abnormal occlusion, and to discuss the diagnosis principles and the practical techniques of the dental prosthesis for occlusal rehabilitation. Methods Forty two elderly patients with abnormal occlusion were treated with occlusal rehabilitation with fixed dentures, fixed-removable dentures and removable partial dentures. Eight patients among them simultaneously had temporomandibular joint(TMJ) disorder. After the clinical procedures including examination, diagnosis, prosthesis design, manufacture, application of occlusal rehabilitation and post-treatment evaluation, the using condition of dentures, patients' satisfaction ratings, TMJ functions and abutment teeth healthy status were examined before and after treatment. Results All the patients were satisfied with their dentures' general functions 1 year after treatment. Compared with the removable partial dentures, the other two types of prosthesis showed better clinical outcomes (χ2=4.15,P<0.05) and compacts on phonation of the dentures (χ2=4.71,P<0.05). In the 8 patients with TMJ disorder, 7 cases were cured completely. The treatment effects of TMJ pain (χ2=0.031, P<0.05)and TMJ click (χ2=0.038, P<0.05)had statistical differences. 30 teeth of the 203 abutment teeth (14.8%) had the problems of periodontal diseases and secondary caries and the incidences of these problems were higher in using removable partial dentures treatment than in the other two methods. Conclusions After the systematic diagnosis and the prosthesis design procedures of occlusal rehabilitation, it is important to choose a proper prostheses for the elderly patients according to their physical and psychological features, which may give the patients satisfactory results.
3.Cerebral ischemia models in rats
Rongliang WANG ; Feng YAN ; Zhifeng GAO ; Xunming JI ; Yumin LUO
International Journal of Cerebrovascular Diseases 2012;20(1):48-53
This article summarizes the methods of making rat cerebral ischemia models and comments the advantages and disadvantages of various methods in order to provide references for the selection of animal models in the basis and appfication research of cerebral ischemia.
4.Risk factors for hydrocephalus after moderate to severe traumatic brain injury
Cheng CAO ; Jiqiang MA ; Yumin LIANG ; Wei WU ; Heng GAO
Chinese Journal of Trauma 2016;32(7):602-606
Objective To investigate the risk factors of posttraumatic hydrocephalus (PTH) in patients with moderate to severe traumatic brain injury (TBI).Methods Aretrospective study was conducted for 183 patients with moderate to severe TBI (125 males,58 females;6-91 years of age,mean 48.23 years).According the presence of PTH,the patients were allocated into PTH group (n =34) and non-PTH group (n =149).Risk factors of PTh were assessed by univariate and logistic regression analysis,including gender,age,injury types,injury severity,intraventricular hemorrhage,subarachnoid hemorrhage,midline shift,subdural effusion,therapeutic strategies and skull defect.Association between the boundaries of skull defect and PTH was determined.Results Between-group differences were not significant regarding age,gender,injury types and intraventricular hemorrhage (P > 0.05),but differed significantly in injury severity,subarachnoid hemorrhage,midline shift,subdural effusion,craniectomy and skull defect (P < 0.05).Further Logistic regression analysis confirmed subarachnoid hemorrhage (OR =6.169),interhemispheric subdural effusion (OR =31.743),and unilateral (OR =17.602) and bilateral (OR =30.567) skull defects were risk factors of PTH.Of the patients with unilateral skull defect following decompressive craniectomy,the inferior limit ≤ 10 mm from the zygomatic arch also played a role in the development of PTH (OR =5.500,P < 0.05).Conclusions Subarachnoid hemorrhage,interhemispheric subdural effusion and skull defect are risk factors of PTH.Unilateral skull defects with the inferior limit too close to the zygomatic arch can predispose to the development of PTH.
5.Microarray analysis of altered gene expression profile of hippocampus after traumatic brain injury in rats
Junfeng FENG ; Kuiming ZHANG ; Xian FU ; Guoyi GAO ; Yinghui BAO ; Yumin LIANG ; Yaohua PAN ; Jiyao JIANG
Chinese Journal of Trauma 2008;24(5):360-366
Objective To screen the altered gene expression profile of hippocampus after traumatic brain injury(TBI)in rats. Methods Rats(n=3)in experimental group underwent moderate fluid-percussion(F-P)brain injury and the hippoeampus sample in the injured hemisphere was removed and conserved in liquid nitrogen three hours later.The rats(n=5)of the control group underwent the same procedure except for injury.Mfymetrix rat genome 230 2.0 array was used to detect the gene expression profile of hippocampus in two groups and find the altered gene expression profile. Results A total of 159 genes in the experimental group changed significantly(≥2 folds)compared with the control group,of which 136 genes were up-regulated and 23 genes down-regulated. Conclusions The significant gene expression changes of hippocampus,especially a large mount of up-regulated genes,are detected after moderate TBI in rats,suggesting that the secondary injury following TBI is a procedure involving multiple factors.
6.Expression changes of microRNA array in mesencephalon of rats with traumatic coma
Guoyi GAO ; Xian FU ; Yumin LIANG ; Yinghui BAO ; Junfeng FENG ; Kuiming ZHANG ; Lei Lü ; Jiyao JIANG
Chinese Journal of Trauma 2008;24(4):274-278
Objective To set up a rat model with acute traumatic coma and identify the variation of microRNA in mesencephalon. Methods After rats were injured moderately by central fluid percussion system, tissues of the mesencephalon were removed one hour after injury. RNA of brain tissue of the mesencephalon was isolated for microRNA array by using the exiqon microarray system. The data were analyzed statistically by Genepix Pro 6.0 after hybridization results were scanned and fluorescence intensity standardized. Resets Hybridization results showed 33 microRNAs with up-regulated expressions but 38 microRNAs with down-regulated activity. Conclusion Expression of microRNA array shows marked changes in the tissues of the mesencephalon in rats with traumatic coma, as may be injury mechanism of traumatic coma and also a way of neurobiological protection of coma.
7.Clinical efficacy of early right median nerve electrical stimulation for coma patients followingcraniocerebral trauma
Guoyi GAO ; Yinghui BAO ; Yumin LIANG ; Yaohua PAN ; Shenghao DING ; Jiyao JIANG
Chinese Journal of Trauma 2012;28(3):200-204
ObjectiveTo evaluate the clinical benefits of early right median nerve electrical stimulation on coma patients following craniocerebral trauma. MethodsCraniocerebral trauma patients with up to two weeks of coma in the years 2005-2011 were involved in the study and were randomly divided into control group (received routine management ) and treatment group (routine management plus right median nerve electrical stimulation).The treatment lasted for a period of more than two weeks.The clinical efficacy of the right median nerve electric stimulation and the conscious status of the patients within six months after craniocerebral trauma were observed.ResultsA total of 456 patients were enrolled in the study,of whom 437 patients completed the treatment course,including 221 patients in the treatment group and 216 in the control group.There was no complication related to electric stimulation during the treatment.Cerebral blood flow (CBF) imaging and brain stem evoked potential (BEP) examination demonstrated significant improvement in the treatment group.A total of 386 patients were followed up for six months postoperatively,which showed that there were 122 patients with regained consciousness,46 in minimally conscious state and 36 in vegetative state in the treatment group (204 patients) and there were 84 patients with regained consciousness,40 in minimally conscious state and 58 in vegetative state in the control group ( 182 patients).The patients in the treatment group showed a higher ratio of regained consciousness and a lower ratio of vegetative state compared with the control group,but the ratio of minimally conscious state showed no statistical difference between two groups. ConclusionsRight median nerve electrical stimulation is a suitable coma awaking means at early stage after craniocerebral trauma.
8.Micro-hardness and elastic modulus of Ti-30Nb-8Zr-2Mo alloy for dental implants
Jiayin DENG ; Chunxiang CUI ; Shuangjin LIU ; Yumin QI ; Wei YANG ; Ping GAO ; Cheng PENG ; Miyazaki TAKASHI
Chinese Journal of Tissue Engineering Research 2009;13(16):3189-3192
BACKGROUND: As dental implants, pure titanium and Ti-6Al-4V has achieved broad clinical applications, but they also contain toxic vanadium and aluminum element. Moreover, their elastic modulus is so high as to produce stress shield. OBJECTIVE: To examine the micro-hardness and elastic modulus of the self-made Ti-30Nb-8Zr-2Mo titanium alloy. DESIGN, TIME AND SETTING: An observational experiment was performed at the laboratory of College of Material Science and Engineering at Hebei University of Technology between March 2003 and February 2006. MATERIALS: Titanium alloy was prepared using titanium sponge (≥ 99% purify), niobium strip (≥ 99.9% purify), molybdenum powder (≥ 99% purify) and zirconium sponge (≥ 99.4% purify).METHODS: The micro-hardness of the specimens was determined after uniformly annealing, hot-forging and solution. Compression test was conducted on post-aging samples. MAIN OUTCOME MEASURES: Hardness and stress-strain curve.RESULTS: The maximal alloy strength was obtained after solution under 800 ℃ for 0.5 hours. Post-aging alloy's hardness was improved significantly although little change occurred on solution alloy. Compressive strength of alloy samples was 1 054 MPa, while elastic modulus reached 16.5 GPa. CONCLUSION: Both micro-hardness and elastic modulus of the self-made Ti-30Nb-8Zr-2Mo titanium alloy have satisfied performance requirements for dental implant materials.
9.Preparation of ROS responsive nano prodrug and its anti-tumor activity in vitro
Fan HUANG ; Yang GAO ; Lijun YANG ; Chunhua REN ; Liping CHU ; Yumin ZHANG
Tianjin Medical Journal 2017;45(4):349-354
Objective To design and synthesize a novel paclitaxel loaded nanoparticle with reactive oxygen species (ROS) response, and characterize its structure, and investigate its stability, in vitro drug responsive release, cellular uptake and in vitro antitumor activity. Methods The PEG-2S-PTX monomer was synthesized by coupling the hydrophilic polyethylene glycol (PEG) with hydrophobic paclitaxel (PTX) via a thioether chain (2S), and the prodrug nanoparticles (PEG-2S-PTX NPs) were prepared by self-assembly. Meanwhile, using succinic anhydride (SA) as the linking group to synthesize the PEG-SA-PTX monomer and prepare the other prodrug nanoparticles (PEG-SA-PTX NPs) as control. The structures of PEG-2S-PTX and PEG-SA-PTX monomer were confirmed by 1H-NMR. The diameter and stability of the nanoparticles were detected by dynamic light scattering (DLS). The PTX release kinetics under oxidizing condition was detected by high performance liquid chromatography (HPLC) method. And the cellular uptake efficiency of nanoparticles by MCF-7 cells was observed by fluorescence microscope. The in vitro antitumor effects of nanoparticles were compared by MTT assay. Results PEG-2S-PTX and PEG-SA-PTX could both be self-assemble into nanoparticles with the diameter of (92.15±12.42) nm and (113.20±12.16) nm. PEG-2S-PTX NPs could rapidly release PTX under oxidative condition while PEG-SA-PTX NPs only showed weak responsiveness. PEG-2S-PTX NPs could be more rapidly taken up by MCF-7 cells compared with PEG-SA-PTX NPs. They both showed concentration dependent anti-tumor effects, but the cytotoxicity of PEG-2S-PTX NPs was stronger than that of PEG-SA-PTX NPs in the concentrations of 0.05, 0.1, 5, 10, 50 and 100 mg/L (P<0.05). Conclusion As paclitaxel prodrug nanoparticles with ROS responsive ability, PEG-2S-PTX NPs can rapidly release PTX in response to ROS in tumor cells, and exhibit great anti-tumor activity in vitro.
10.Cardiac troponin I in children with left-to-right shunt congenital heart disease
Zhifang ZHANG ; Yiwei CHEN ; Fen LI ; Wei GAO ; Zhiqing YU ; Aiqing ZHOU ; Yumin ZHONG ; Yuqi ZHANG
Journal of Clinical Pediatrics 2014;(9):863-866
Objective To analyze the level of cardiac troponin I (cTnI) in children with left-to-right shunt congenital heart disease (CHD). Methods In this study, 146 children with secundum atrial septal (ASD) defect, 132 children with ventricular septal defect (VSD) and 300 healthy children were recruited. The levels of cTnI and N-terminal pro-brain natriuretic peptide (NT-proBNP) were measured and their correlation with clinical data was analyzed. Results The serum cTnI and NT-proBNP levels in both ASD and VSD patients were signiifcantly higher than those in normal children (H=3.89 and 5.27, P<0.01). The serum cTnI and NT-proBNP levels in VSD patients were signiifcantly higher than those in ASD patients (P<0.05). The ratio of pulmonary to systemic arterial pressure (Pp/Ps), pulmonary vascular resistance index (PVRI) and standardized left ventricular end diastolic volume in VSD patients were signiifcantly higher than those in ASD patients (P<0.05). Multiple regression analysis showed that Pp/Ps was signiifcantly correlated with cTnI in VSD patients. (β=0.81, SE=0.03, P=0.000). Conclusions Signiifcant volume and pressure overload due to a left-to-right shunt induce myocardial injury and could lead to irreversible myocardial remodeling in children with CHD. The serum cTnI level is a sensitive biomarker for myocardial damage in VSD patients.