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Search Results: 1 - 10 of 2018 matches for " Alireza Yarahamadi "
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A Case of Prolonged Delayed Postdural Puncture Headache in a Patient with Multiple Sclerosis Exacerbated by Air Travel
Jahan Porhomayon,Gino Zadeii,Alireza Yarahamadi,Nader D. Nader
Case Reports in Anesthesiology , 2013, DOI: 10.1155/2013/253218
A Case of Prolonged Delayed Postdural Puncture Headache in a Patient with Multiple Sclerosis Exacerbated by Air Travel
Jahan Porhomayon,Gino Zadeii,Alireza Yarahamadi,Nader D. Nader
Case Reports in Anesthesiology , 2013, DOI: 10.1155/2013/253218
Abstract: The developments of new spinal needles and needle tip designs have reduced the incidence of postdural puncture headache (PDPH). Although it is clear that reducing the loss of CSF leak from dural puncture reduces the headache, there are areas regarding the pathogenesis, treatment, and prevention of PDPH that remain controversial. Air travel by itself may impose physiological alteration in central nervous system that may be detrimental to patients with PDPH. This case report highlights a case of a young female patient who suffered from a severe incapacitating PDPH headache during high-altitude flight with a commercial jet. 1. Introduction The first case report of postdural puncture headache (PDPH) was described in about 100 years ago by Bier and his assistant [1]. It was later postulated that PDPH is triggered by leakage of cerebrospinal fluid through the dural rent, but the cause of the pain is probably due to intracranial arterial and venous dilatation [2]. PDPH remains one of the major complications of spinal tap performed for diagnostic purposes. Other adverse events after lumbar puncture include dysesthesia, backache, nerve palsies, infectious processes, and bleeding disorders [3]. The patterns of development of PDPH depend on a number of procedure and nonprocedure-related risk factors. Knowledge of procedure-related factors supports interventions designed to reduce the incidence of PDPH. Despite the best preventive efforts, PDPH may still occur and be associated with significant morbidity [4, 5]. The potential risks for developing PDPH include female gender [6], young adults, repeated attempt with multiple dural punctures, and the size/type and orientation of the needle [7]. Gender is believed to be an independent risk factor for the development of PDPH as demonstrated by the recent meta-analysis by Wu et al. [6]. Clinical presentation of the PDPH or “spinal headache” is usually described as a severe, dull pain, usually frontal occipital, which is irritated in the upright position and decreased in the supine position. It may or may not be accompanied by nausea, vomiting, and visual/auditory disturbances. The onset of PDPH is between 2 to 72 hours, and latency period of up to 15 days has generally been described in the literature [8, 9]. 2. Case Report This is unique case of a young 23 years old middle Eastern female who developed an acute unilateral eye pain and generalized headache with visual disturbances associated with fatigue and weakness in lower extremities for two days. She presented to a local community hospital and was examined by a
Application of Dual Mask for Postoperative Respiratory Support in Obstructive Sleep Apnea Patient
Jahan Porhomayon,Gino Zadeii,Nader D. Nader,George R. Bancroft,Alireza Yarahamadi
Case Reports in Anesthesiology , 2013, DOI: 10.1155/2013/321054
Abstract: In some conditions continuous positive airway pressure (CPAP) or bilevel positive airway pressure (BIPAP) therapy alone fails to provide satisfactory oxygenation. In these situations oxygen (O2) is often being added to CPAP/BIPAP mask or hose. Central sleep apnea and obstructive sleep apnea (OSA) are often present along with other chronic conditions, such as chronic obstructive pulmonary disease (COPD), congestive heart failure, pulmonary fibrosis, neuromuscular disorders, chronic narcotic use, or central hypoventilation syndrome. Any of these conditions may lead to the need for supplemental O2 administration during the titration process. Maximization of comfort, by delivering O2 directly via a nasal cannula through the mask, will provide better oxygenation and ultimately treat the patient with lower CPAP/BIPAP pressure. 1. Introduction Obstructive sleep apnea (OSA) is a complex medical disorder, characterized by repetitive upper airway collapse during sleep. The disease affects individuals of all ages and predisposes to multiple comorbidities, including increased risk of cardiovascular disease [1]. Perioperative apneas appear to be multifactorial in nature. Sedatives and anesthetics have been shown to decrease pharyngeal muscle tone and therefore predispose to apnea [2]. Meanwhile, the patient’s normal arousal responses and reflexes are also compromised by anesthetics [3]. This predisposes to apneic episodes which can be more severe than those associated with natural sleep. While many patients present for surgery with undiagnosed OSA, it is currently recommended that patients who receive ambulatory CPAP preoperatively should continue to have CPAP administered in the perioperative period. Otherwise, the optimal management of OSA in the perioperative period has yet to be elucidated [4]. 2. Case Report A 51-year-old obese male, with a history of daytime fatigue, presented to the anesthesia holding area for urgent appendectomy. He had previously undergone a sleep study several months before with apnea/hypopnea index (AHI) of 35 and a maximum desaturation to the low 60’s. Patient vital signs included a blood pressure of 140/85?mm/Hg, heart rate of 95 beats per minute and respiratory rate of 16 per minute with a temperature of 38 centigrade. His pulse oximetry (SaO2) reading was 91% with 2 liters/minute of nasal oxygen flow. Chest radiography did not show any pathology. He was brought to operating room, and anesthesia was induced with propofol and succinylcholine in a rapid sequence technique. The trachea was intubated with the aid of a GlideScope.
An Actual Survey of Dimensionality Reduction  [PDF]
Alireza Sarveniazi
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.42006

Dimension reduction is defined as the processes of projecting high-dimensional data to a much lower-dimensional space. Dimension reduction methods variously applied in regression, classification, feature analysis and visualization. In this paper, we review in details the last and most new version of methods that extensively developed in the past decade.

Antibiotic sensitivity pattern of common bacterial pathogens in NICU and neonatal ward in Hamedan province of Iran  [PDF]
Alireza Monsef, Fatemeh Eghbalian
Health (Health) , 2010, DOI: 10.4236/health.2010.26094
Abstract: Bacterial pathogens and drug resistance are different in hospitals of each country. In this study we determined bacterial path- ogens and drug sensitivity in the neonatal ward and neonatal intensive care unit (NICU) in Ekbatan hospital in Hamedan. This cross-sectional descriptive study was done on 1150 hospitalized neonates in neonatal and NICU wards of Ekbatan hospital of the Hamadan university of medical sciences from September 2004 to September 2006. Blood, cerebrospinal fluid (CSF), urine, stool, eye excretion, synovial fluid, umbilical secretion and ascitic fluid were evaluated. Positive cultures were evaluated for antibiotic resistance with disk diffusion test methed. All of the data in questionnaires was analyzed with SPSS 13. Cultures including blood, urine, CSF , stool, eye excretion, synovial fluid, umbilical secretion and ascitic fluid was done in 417 neonates (833 cultures). These cultures were including: urine, 323 cases (38.8%) blood 293 cases (35.2%), CSF 180 cases (21.6%) , stool 17 cases (2%), eye secretion 16 cases (1.9%) and other secretions (synovial, umbilical, etc) 4 cases (0.5%). The cultures were positive in 105 cases (25.2%). 60 male neonates (57.1%) and 45 female neonates (42.9%) were culture positive. The most common microorganisms were E coli 66.7% (70 cases), Klebsiella 10.5% (11 cases). Drug resistance was high in these microorganisms. The most common microorganisms were Ecoli and klebsiella. Drug resistance was high in the isolated microorganisms.
Improving Mutual Coherence with Non-Uniform Discretization of Orthogonal Function for Image Denoising Application  [PDF]
Hani Nozari, Alireza Siamy
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.23025
Abstract: This paper presented a novel method on designing redundant dictionary from known orthogonal functions. Usual way of discretization of continuous functions is uniform sampling. Our experiments show that dividing the function definition interval with non-uniform measure makes the redundant dictionary sparser and it is suitable for image denoising via sparse and redundant dictionary. In this case the problem is to find an appropriate measure in order to make each atom of dictionary. It has shown that in sparse approximation context, incoherent dictionary is suitable for sparse approximation method. According to this fact we define some optimization problems to find the best parameter of distribution measure (in our study normal distribution). For better convergence to optimum point we used Genetic Algorithm (GA) with enough diversity on initial population. We show the effect of this type of dictionary design on exact sparse recovery support. Our results also show the advantage of this design method on image denoising task.
The New Methods for Purifying the Industrial Effluents by Submerged Biofilm Reactors  [PDF]
Seyed Alireza Mousavi Shirazi
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.27114
Abstract: Life on the earth is dependent on dynamic interactions between its physical, chemical and biological components. In fact, all the individual processes are responsible for regulating the environmental equilibrium which can provide biosphere for multiple forms of human life. In order to overcome on shortcomings, the use of immobilized cell bioreactor technology which provides a valuable effective for treatment of waste water is discussed. An immobilized system which in this matter is applied is about absorbed or captured microorganisms in a solid substratum to retain them in a reactor or analytical system. The multiply of these immobilized cells is done when by nutrients be supplied and then migrate to the surfaces which are referred to biofilms. The biofilms can be developed on various support systems such as polypropylene pall, rocks, sands, charcoal, ceramics, and glass beads. The controllable reaction vessels which are used for these colonized surfaces are referred to bioreactors. Bioreactors in both up flows and down flows mode which use of either batch or continuous processes principle can be operated. Synchronic with development in biotechnology, there is also an extensive development in the field of bioreactors like: pumped tower loop reactor (PTLR), liquid impelled loop reactor (LILR), multipurpose tower bioreactor (MTB), fluidized-bed and packed-bed bioreactor, that in this article are discussed them.
Postoperative Drains at the Donor Sites of Iliac-Crest Bone Grafts in Patients Who Had a Single Comminuted Long Bone Fracture  [PDF]
Ali Karbalaeikhani, Alireza Saied
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.29095
Abstract: In this clinical trial, 90 patients admitted to orthopedics ward, Shahid Mohammadi Hospital, Bandar Abbass with a long bone fracture, comminuted more than 30%, were randomly divided into two groups. In the first group, after the completion of the operation, a single hemovaccum drain was inserted into the iliac crest wound, the site of cancellous bone removal, whereas the second group didn’t receive a drain. The two groups were followed for at least six months and the results were compared with Chi-Square and T-Tests. The two groups, at the end of the follow up period, had no statistically significant difference with regard to pain severity and need for dressing change (in the immediate postoperative period), hematoma formation and infection. So it seems that drain insertion in the wound of patients in whom cancellous bone is removed from the iliac crest, is not necessary.
The Computation of Scalar Curvature in the Four-State Mixed Spin Model and the Investigation of Its Behavior: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31005
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the authors’ name: Alireza Heidari, Foad Khademi,Jahromi and Roozbeh Amiri. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.4 334-339, 2012, has been removed from this site.
Environmental and Geo-Referenced Information Modeling for Sustainable Development in Iran  [PDF]
Alireza Gharagozlou, Mahsa Adl
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.41004
Abstract: By providing Geo-referenced information, which serves as an important tool for decision-making in land use planning, national mapping agencies can help provide effective monitoring of environmental resources while in many parts of the world lack adequate information in clear. Their role in sustainability and development planning is thus unique and es- sential. National cartographic centers and national mapping agencies offers example of such national mapping agencies. Accurate information on land and environmental resources is essential to effective land use planning. Key sources of in- formation include topographic maps, aerial photos, satellite images, and data derived from geographic information sys- tems (GIS). At the national level, this information can be used to identify environmental resources, reveal the develop- ment potential of the country, and help promote effective ecological studies and sound land use planning with a land use planning approach. This article begins with some general comments on the importance of land use planning, and outli- nes some current environmental issues and also highlights the connection between roles of Geo-referenced information in land use planning with a sustainable development approach. The discussion describes several key methods of resour- ce identification, with particular emphasis on aerial photography and the existing potentials of Iran in this field. The ar- ticle also discusses the role that the Geo-referenced information and environmental planning play in developing and promoting geographic information system use to sustainable development and finally present proper models to use en- vironmental information and geo-referenced data for sustainable development.
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