Clinical Evaluation of Patients with Spinal Cord Infarction in Mashhad, Iran

Background. Spinal Cord Infarction (SCI) is a rare and disabling disease. This hospital-based study was conducted for clinical evaluation of SCI patients in east of Iran. Methods. Consecutive SCI patients admitted in Ghaem hospital,Mashhad during 2006–2010 were enrolled in a prospective clinical study. Diagnosis of SCI was made by neurologists and radiologists. Demographic features, clinical syndrome, and Magnetic Resonance Imaging (MRI) findings were recorded. All of the patients underwent a standard battery of diagnostic investigations. All of the patients suspected to SCI had MRI of spinal cord at the symptomatic level of cord with a 0.5 Tesla generation, Philips NT Intra, Netherland equipment. An equal number of patients with Brain Infarction (BI) were randomly selected from our stroke registry data bank. Etiology and degree of disability were compared between these groups of patients. Results. Fourteen SCI patients (9 females, 5 males) with mean age 38.8 ± SD: 19.9 years were evaluated. Miscellaneous causes consisted 50% of etiologies in patients with SCI. Uncertain etiology, atherosclerosis, and cardioembolisms consisted 35.7%, 7.1%, and 7.1% of SCI causes, respectively. Distribution of etiologies was significantly different between SCI and BI patients, X2 = 12.94, df = 3, P = .003. Difference in mean disability score at acute phase of stroke was not significant between two studied groups, z = 1.54, P = .057. Difference in mean changes of disability score at 90 days postevent was significant in two groups of patients, z = 2.65, P = .019. Conclusion. SCI is a rare disease with poor recovery. Distribution of etiologies of SCI patients is quite different than of BI patients

Age Effects on Decision-Making, Drift Diffusion Model

Training can improve human decision-making performance. After several training sessions, a person can quickly and accurately complete a task. However, decision-making is always a trade-off between accuracy and response time. Factors such as age and drug abuse can affect the decision-making process. This study examines how training can improve the performance of different age groups in completing a random dot motion (RDM) task. The participants are divided into two groups: old and young. They undergo a three-phase training and then repeat the same RDM task. The hierarchical drift-diffusion model analyzes the subjects' responses and determines how the model's parameters change after training for both age groups. The results show that after training, the participants were able to accumulate sensory information faster, and the model drift rate increased. However, their decision boundary decreased as they became more confident and had a lower decision-making threshold. Additionally, the old group had a higher boundary and lower drift rate in both pre and post-training, and there was less difference between the two group parameters after training

Electrochemical polymerization of pyrene derivatives on functionalized carbon nanotubes for pseudocapacitive electrodes

Electrochemical energy-storage devices have the potential to be clean and efficient, but their current cost and performance limit their use in numerous transportation and stationary applications. Many organic molecules are abundant, economical and electrochemically active; if selected correctly and rationally designed, these organic molecules offer a promising route to expand the applications of these energy-storage devices. In this study, polycyclic aromatic hydrocarbons are introduced within a functionalized few-walled carbon nanotube matrix to develop high-energy, high-power positive electrodes for pseudocapacitor applications. The reduction potential and capacity of various polycyclic aromatic hydrocarbons are correlated with their interaction with the functionalized few-walled carbon nanotube matrix, chemical configuration and electronic structure. These findings provide rational design criteria for nanostructured organic electrodes. When combined with lithium negative electrodes, these nanostructured organic electrodes exhibit energy densities of ~350 Wh kg[−1 over electrode] at power densities of ~10 kW kg[−1 over electrode] for over 10,000 cycles.National Science Foundation (U.S.). Graduate Research Fellowship (Grant 1122374)National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Award DMR-0819762

Composite Supercapacitor Electrodes by Electrodeposition of MnO2 on MWCNT Felt Directly Grown on Aluminum

Manganese oxide \ carbon nanotube (CNT) thin film electrodes were fabricated by direct growth of a carbon nanotube layer on aluminum substrate (i.e. a commercially viable material for use as current collector) by chemical vapor deposition, in the presence of an electrochemically deposited thin film nickel catalyst, followed by anodic electrodeposition of MnO2. A proof of concept of this approach is demonstrated showing that the fabrication process, even in its simplest and unsophisticated implementation –notably without any deliberate effort to control the CNT growth arrangement and consequently the composite microstructure– allows the preparation of MnO2/CNT/Al prototype electrodes having almost a three-fold increase in capacitance compared to MnO2/Ni electrodes and, more significantly, comparing favorably with composite electrodes of similar design and fabrication. MnO2/CNT/Al electrodes ensured also improved cyclic stability compared to the reference case of MnO2/Ni electrodes. The proposed scheme is an effective procedure for the fabrication of thin film composite MnO2/CNT/Al electrodes, which may be amenable to significant improvements by tailoring thickness and microstructure of the CNT scaffold and manganese oxide film. Furthermore, a similar process scheme, may be proposed for the fabrication of active electrodes of different scopes with a proper choice of the substrate

Growth of carbon nanotubes on aluminium foil for supercapacitors electrodes

A new approach for the preparation of carbon nanotubes (CNTs) electrode is proposed in the present work. Multi-walled carbon nanotubes (MWCNTs) were grown by chemical vapour deposition on aluminium strips pre-plated with a nickel thin film as the catalyst. The CNTs were characterized by scanning and transmission electron microscopy, Brunauer–Emmett–Teller surface area measurement and thermogravimetric analysis. The nickel-plated aluminium foil with a layer of CNTs was further characterized for an assessment of its electrochemical behaviour as electrode for supercapacitors. The specific capacitances of the electrode, as derived from cyclic voltammetry measurement at 0.1 V s-1 scan rate, was found to be 54 and 79 F g-1 in aqueous and organic electrolytes, respectively, in line with the highest reported values for either activated carbon or MWCNTs electrodes. Further evidence in support of the viability of the present approach for the preparation of a CNTs electrode was obtained from electrochemical impedance spectroscop

Risk factors of short-term stroke recurrence in patients with minor ischemic cerebrovascular events

BACKGROUND: Assessing the risk of recurrent ischemic events in patients with transient ischemic attack (TIA) and minor ischemic stroke (MIS) is of a great importance in clinical practice. METHODS: Consecutive patients with TIA or MIS who were visited in Ghaem Hospital, (Mashhad, Iran) were enrolled in a prospective cohort study during 2010 to 2011. Diagnosis of TIA or MIS was accomplished by a stroke neurologist. Only those who presented within 24 hours from the onset of symptoms were recruited. MIS was considered as an ischemic stroke with National Institutes of Health Stroke Scale (NIHSS) &lt; 4. The endpoint of the study was a new ischemic cerebrovascular event or vascular death in 90 days and additionally in 3 days. The decision to admit and type of treatment in each case was left to the discretion of the stroke neurologist. The association between 20 potential factors with recurrent ischemic events in 3 and 90 days was investigated using univariate and multivariate analysis (MVA). RESULTS: 393 TIA patients (238 males and 155 females) and 118 MIS patients (77 males and 41 females) were enrolled in the study. Stroke occurred in 117 (23.2%) patients, TIA in 99 (19.6%), and there was 11 (2.2%) vascular deaths within 3 months in the total 511 patients with minor ischemic events. Crescendo TIAs and multiple TIAs were associated with greater risk of stroke in 3 days in a univariate analysis (OR = 5.12, P &lt; 0.001) and (OR = 3.98, P = 0.003), respectively. Patients with index stroke had 11.5% lower risk of recurrent stroke in 3 days than patients with index TIA in multivariate analysis (OR = 0.115, P = 0.039). Diabetes was independently associated with 3 months stroke recurrence in the patients with minor ischemic events (OR = 2.65, P = 0.039). CONCLUSION: Multiple and crescendo TIAs are the main predictors of stroke recurrence, derived from the univariate analysis of the patients with minor ischemic events. &nbsp; Keywords: Transient Ischemic Attacks, Infarction, Brain, Recurrence, Risk</div

RESULTS OF SURGICAL AND NON-SURGICAL TREATMENT OF ANEU-RYSMS IN IRAN

BACKGROUND: Direct surgery or endovascular procedures are an accepted way of treating patients with Aneurismal Subarachnoid Haemorrhage (SAH). However the impact of invasive methods of treatment on results in developing countries may differ from that in developed countries. &nbsp;&nbsp; METHODS: This is a prospective clinical study of consecutive patients with Subarachnoid Haemorrhage (SAH) admitted in Ghaem hospital in Mashhad during 2005-2010. The initial diagnosis and investigations were carried out by neurologists. The patients were divided into two groups. One received surgical treatment whilst the other group was managed medically. The decision as to the choice of method of treatment was made by the neurosurgeons. The initial medical treatment was standardised for all the patients. The rate of complications and mortality was compared in both medical and surgical groups. &nbsp;&nbsp; RESULTS: 120 SAH patients (52% females) with a mean age of 50.6 &plusmn; 7 years were evaluated. The angiography revealed the presence of an aneurysm in 62 patients. 63.5% of patients received medical treatment and 37.5% underwent aneurysmal surgery. Difference of rebleeding rate in two therapeutic groups was not significant; &chi;2 = 0.014, P = 0.91. The effect of rebleeding on mortality was not significant; &chi;2 = 2.54, P = 0.14. Within 62 SAH patients with cerebral aneurysm, the mortality rate in both therapeutic groups was also not significantly different; &chi;2 = 0.16, P = 0.77. &nbsp;&nbsp; CONCLUSION: There is no significant difference in the mortality rate between the &ldquo;surgical&rdquo; and non &ldquo;surgical&rdquo; groups of patients with SAH. This could be due to delay in performance of surgery in neurovascular centers in Iran.Keywords: Mortality, subarachnoid, surgery, haemorrhage.</p

Effect of mirror therapy on walking ability in patients with stroke

Background and Aim: Stroke is one of major causes of disability. Therefore, it is important to introduce and develop new treatment approaches in order to improve and enhance post-stroke recovery process for medical, social, and economical purposes. The present study aimed at determining the effect of mirror therapy on walking ability of patients with stroke regarding the muscular power of the affected leg. Materials and Methods: This semi-experimental study was done on 50 stroke patients that were hospitalized in Mashhad Imam Reza and Quaem hospitals. They were randomly classified into two equal groups of control . and mirror therapy(experimental group).For the experimental group, twenty 30 –minute sessions were daily held, so that every . patient did the range of motion of lower extremitiy of the healthy side in front of a mirror and observed just its mirror image. In addition to mirror therapy , the routine program physiotherapy was performed for both groups. Power of muscle in the affected leg was assessed on the basis of a 5-score scale and every patient`s walking ability was assessed before, during, and after intervention using function ambulation classification. Finally, the obtained data was analyzed by means of SPSS software(V:11.5), using independent T, paired T,Mann-Whitney and Wilcoxon statistical tests. Results: The two groups showed no significant difference in terms of walking ability regarding the muscular power of the affected leg and confounding variables before intervention (P=0.210). Walking ability of the affected leg in mirror therapy group did not significantly improve.in comparison with the control group after intervention (P=0.756). But the walking ability regarding the muscular power of the affected leg in mirror therapy group was significantly improved in comparison with the control group in the 10th session (P=0.038). Conclusion: Mirror therapy can improve walking ability of patients with stroke as a simple, inexpensive and a patient-oriented treatment

Performance Evaluation of the RANS Models in Predicting the Pollutant Concentration Field within a Compact Urban Setting: Effects of the Source Location and Turbulent Schmidt Number

Computational Fluid Dynamics (CFD) is used to accurately model and predict the dispersion of a passive scalar in the atmospheric wind flow field within an urban setting. The Mock Urban Setting Tests (MUST) experiment was recreated in this work to test and evaluate various modeling settings and to form a framework for reliable representation of dispersion flow in compact urban geometries. Four case studies with distinct source locations and configurations are modeled using Reynolds-Averaged Navier&ndash;Stokes (RANS) equations with ANSYS CFX. The performance of three widely suggested closure models of standard k&minus;&epsilon;, RNG k&minus;&epsilon;, and SST k&minus;&omega; is assessed by calculating and interpreting the statistical performance metrics with a specific emphasis on the effects of the source locations. This work demonstrates that the overprediction of the turbulent kinetic energy by the standard k&minus;&epsilon; counteracts the general underpredictions by RANS in geometries with building complexes. As a result, the superiority of the standard k&minus;&epsilon; in predicting the scalar concentration field over the two other closures in all four cases is observed, with SST k&minus;&omega; showing the most discrepancies with the field measurements. Additionally, a sensitivity study is also conducted to find the optimum turbulent Schmidt number (Sct) using two approaches of the constant and locally variable values