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Search Results: 1 - 10 of 2096 matches for " Alireza Khoshnevisan "
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Neuronavigation: Principles, Clinical Applications and Potential Pitfalls
Alireza Khoshnevisan,Narges Sistany Allahabadi
Iranian Journal of Psychiatry , 2012,
Abstract: Localization of brain lesions and prevention of damage to vital structures are important in operation of brain pathologies. Despite development of many techniques including angiography, MRI, sonography ,and frame base stereotaxy , a more accurate localizing technique is still needed (1,2) . A step forward to achieve this goal is to develop a navigation system. In this manuscript, we explained some clinical applications, advantages, and disadvantages of navigation system and tried to have a short glimpse on its future.
An Overview of Pharmacological Approaches for Management and Repair of Spinal Cord Injuries
Alireza Khoshnevisan,Azam Mardani,Shahab kamali
Iranian Journal of Psychiatry , 2010,
Abstract: "nSpinal cord injury (SCI) leads to loss of nervous tissue and consequently to catastrophic neurological deficits. Up to now there is no definite treatment available that restores the loss of function to a degree that an independent life can be guaranteed. "nThis justifies the cost of research into the new modalities for a treatment of SCIs. In current paper, recent developments and new approaches in pharmacological therapy have been reviewed
Comparison of Modified Ashworth Scale and Hoffmann Reflex in Study of Spasticity
Amir Hassan Kohan,Shahram Abootalebi,Alireza Khoshnevisan,Mehdi Rahgozar
Acta Medica Iranica , 2010,
Abstract: "nSpasticity is one of the common complications in upper motor neuron lesions and without appropriate treatment it causes disturbances in movement pattern. Assessments of patients are effective in patient`s management. Modified Ashworth scale (MAS) is one of the criteria in qualitative assessment of spasticity, and there are lots of controversies about its validity. The purpose of this study is to compare MAS with electrophysiological indices of spasticity. The spasticity of upper limb muscles in patients with hemiplegic cerebral palsy are measured and recorded by MAS. Then electrophysiological indices of Hoffmann reflex (H reflex) and ratio of maximum range of action potential of combined movement of flexor carpi radialis (FCR) for upper limb and soleus for lower limb were estimated. Data of 11 patients with age range 4 to 6 were analyzed. There is no significant correlation between degree of spasticity and electrophysiological indices.
Lumbar Vertebral Hemangioma With Extradural Extension, Causing Neurogenic Claudication: A Case Report
Morteza Faghih Jouibari,Alireza Khoshnevisan,Seyed Mohammad Ghodsi,Farideh Nejat
Acta Medica Iranica , 2011,
Abstract: The authors present a rare case of lumbar vertebral hemangioma extending to the epidural space with a bisected appearance and impinging on thecal sac. This 52-year-old lady presented with one year history of low back pain and bilateral leg radiation. Plain radiography showed vertical linear streaks at L2 vertebral body and axial computed tomography (CT) scan revealed small "polka dot" appearance within the vertebral body. Magnetic resonance imaging (MRI) showed low signal intensity on T1-weighted images in L2 vertebral body which was not characteristic for hemangioma. The patient underwent an L2 laminectomy, spinal canal decompression and posterior spinal instrumentation. This study indicates that lumbar vertebral hemangioma can extend to the epidural space and cause neurologic symptoms. Magnetic resonance imaging may not show diagnostic features, especially in active lesions and plain radiography and CT scan may be helpful.
Translation and validation of the EORTC brain cancer module (EORTC QLQ-BN20) for use in Iran
Alireza Khoshnevisan, Mir Saeed Yekaninejad, Shahab Kamali Ardakani, Amir H Pakpour, Azam Mardani, Neil K Aaronson
Health and Quality of Life Outcomes , 2012, DOI: 10.1186/1477-7525-10-54
Abstract: A standard backward and forward translation procedure was used to generate the Persian language version of the QLQ-BN20. The QLQ-BN20 was administered together with the QLQ-C30 to 194 patients diagnosed with primary brain cancer. Multitrait scaling and confirmatory factor analysis (CFA) were used to evaluate the hypothesized scale structure of the questionnaire. Internal consistency reliability was estimated with Cronbach’s alpha. The ability of the QLQ-BN20 to distinguish between patient subgroups formed on the basis of performance status and cognitive status was evaluated, as was the responsiveness of the questionnaire to changes in performance status over time.Multitrait scaling and CFA results confirmed the hypothesized scale structure. The measurement model was consistent across men and women. Internal consistency reliability of the multi-item scales ranged from 0.74 to 0.89. The QLQ-BN20 distinguished clearly between patients with relatively good versus poor performance and cognitive status, and changes in scores over time reflected changes observed in performance status ratings.These results support the validity and reliability of the QLQ-BN20 for use among Iranian patients diagnosed with primary brain cancer. Future studies should examine the psychometrics of the questionnaire when used in patients with brain metastasis.
Misunderstanding Prescription Physician’s Oral Instructions in Patients with Low Back Pain
Alireza Khoshnevisan,Mir Saeed Yekaninejad,Amir Haji Agha Pakpour,Azam Mardani
Acta Medica Iranica , 2010,
Abstract: "nMedication errors and adverse drug events can bring about hospitalization, permanent injury, or death. Patients due to lack of adequate understanding of instruction may unintentionally misuse a prescribed medicine. The aims of the study were to examine whether patients with low back pain were correctly able to understand physician's instructions regarding drug use and also to identify influencing factors in patient's misunderstanding. The sample of the study included patients with low back pain who had been referred to five clinics in order to follow their treatment procedure. The patients completed a questionnaire to assess understanding of physician's instructions by the patients. Afterwards, physician provided them oral instructions on how they must use medications. Once the physician finished the oral instruction, he was asked patients to repeat whatever he said about the instructions. This procedure repeated frequently until the patients described correctly Instructions of the medications use. One hundred and five patients participated in the study. The mean age of the participants was 57.5 (± 13.9) years. Thirty three patients were female (31.4%) and 75.2 percent were married. Almost 80% of the patients misunderstood the oral prescription instructions at first time of presentation instruction. Gender, educational level, back pain history and drug use history were risk factors for misunderstanding prescription medication oral instructions for patients. The study affirmed that patients with low back pain suffered from a poor understanding of oral instruction.
Structural analyses of diffraction patterns from a twined HTc superconductor YBCOx (0
B Khoshnevisan
Iranian Journal of Physics Research , 2009,
Abstract: In this study we introduce a new analytical expression for the intensity distribution of the diffraction patterns from a twined sample of YBCOx ( YBa2Cu3O6+x, 0
Brownian Sheet and Quasi-Sure Analysis
Davar Khoshnevisan
Mathematics , 2004,
Abstract: We present a self-contained and modern survey of some existing quasi-sure results via the connection to the Brownian sheet. Among other things, we prove that quasi-every continuous function: (i) satisfies the local law of the iterated logarithm; (ii) has Levy's modulus of continuity for Brownian motion; (iii) is nowhere differentiable; and (iv) has a nontrivial quadratic variation. We also present a hint of how to extend (iii) to obtain a quasi-sure refinement of the M. Csorgo--P. Revesz modulus of continuity for almost every continuous function along the lines suggested by M. Fukushima.
Slices of Brownian Sheet: New Results, and Open Problems
Davar Khoshnevisan
Mathematics , 2005,
Abstract: We can view Brownian sheet as a sequence of interacting Brownian motions or slices. Here we present a number of results about the slices of the sheet. A common feature of our results is that they exhibit phase transition. In addition, a number of open problems are presented.
Dynamical percolation on general trees
Davar Khoshnevisan
Mathematics , 2007, DOI: 10.1007/s00440-007-0061-6
Abstract: H\"aggstr\"om, Peres, and Steif (1997) have introduced a dynamical version of percolation on a graph $G$. When $G$ is a tree they derived a necessary and sufficient condition for percolation to exist at some time $t$. In the case that $G$ is a spherically symmetric tree, H\"aggstr\"om, Peres, and Steif (1997) derived a necessary and sufficient condition for percolation to exist at some time $t$ in a given target set $D$. The main result of the present paper is a necessary and sufficient condition for the existence of percolation, at some time $t\in D$, in the case that the underlying tree is not necessary spherically symmetric. This answers a question of Yuval Peres (personal communication). We present also a formula for the Hausdorff dimension of the set of exceptional times of percolation.
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