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Search Results: 1 - 10 of 711 matches for " Ehsan Khadivi "
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Double Thyroglossal Duct Cyst Derived from a Single Tract: A Rare Presentation
Ehsan Khadivi,Hossein Payedar Ardekani
Iranian Journal of Otorhinolaryngology , 2010,
Abstract: Introduction: The advent of antibiotics and the improvement in dental hygiene have made the occurrence of deep neck infections less frequent than in the past. Nevertheless, the complications of these infections are often life threatening. The purpose of this study was to review the clinical findings in deep neck infections and identification predisposing factors of these complications. Materials and Methods: In this study, 147 patients with deep neck infections were studied in Imam Khomeini Hospital, Ahvaz, from 1997 to 2009. During the treatment, 24 cases of life threatening complications took place. Linear and logistic regressions and chi-square analysis were used to determine the association of the complications of deep neck infections with clinical parameters and longer hospitalization. Results: Analysis showed that patients with older age, patients with involvement of more than two spaces, involvement of cervical spaces, lymphadenitis, septic sore throat, congenital cyst as a source of abscess, odynophagia, dysphagia are those who require longer hospitalization (P
Correlation Between Upper Airways Obstructive Indexes in Adenotonsilar Hypertrophy with Mean Pulmonary Arterial Pressure
Ehsan Khadivi,Mohsen Horri,Monavar Afzal Aghaee,bolfazl Taheri
Iranian Journal of Otorhinolaryngology , 2010,
Abstract: Introduction: Hypertrophied tonsils and adenoids may cause upper airway obstruction and cardio-pulmonary complications due to pulmonary arterial hypertension. The aim of this study was to determine the correlation between mean pulmonary arterial pressure (mPAP) and selected adenotonsilar hypertrophy indexes. Materials and Methods: Thirty two patients with upper-airway obstruction resulting from hypertrophied tonsils and adenoids were included in our study. Mean pulmonary arterial pressure was measured by a non-invasive method using color doppler echocardiography. Upper airway obstruction was evaluated by clinical OSA (obstructive sleep apnea) scoring and also adenoidal-nasopharyngeal (A/N) ratio in the lateral neck radiography. Results: Fifty percent of the patients with a normal OSA score, 20% of those with a suspected OSA score and also 50% of cases with OSA had pulmonary hypertension (mPAP>20mmHg) which was not statistically significant (P=0.198). Mean Adenoidal-nasopharyngeal ratio in patients with a normal mPAP (mPAP≤20mmHg) was 0.61±0.048 and it was 0.75±0.09 in those with pulmonary hypertension; the difference was statistically significant (P=0.016). Conclusion: It seems that A/N ratio could be used as a predicting factor for increased mPAP in children with upper airway obstruction and a pediatric cardiologist consultation may be necessary before some surgical interventions.
Nasal Septum Perforation due to Methamphetamine abuse
Mehdi Bakhshaee,Ehsan Khadivi,Masoud Naseri Sadr,Fereshteh Esmatinia
Iranian Journal of Otorhinolaryngology , 2012,
Abstract: Introduction: Spontaneous Perforation of the nasal septum is an uncommon condition. Nasal inhalation of substances such as cocaine has long been linked to this Perforation. Case Report: This report describes the case of a 46-year-old woman who was addicted to methamphetamine and who presented with perforation of the nasal septum.This is the first reported case of nasal septal necrosis linked to nasal inhalation of methamphetamine. Conclusions: Patient history and assurance regardingillegal drug consumption and abuse is a key point for fast and accurate diagnosis. The pathophysiology of drug-induced sinunasal disease and a review of the literature are also presented.
A Penetrating Pellet Jeopardizing Internal Carotid Artery
Mohsen Rajati,Mehdi Bakhshaee,Ehsan Khadivi,Mostafa Nasrollahi
Iranian Journal of Otorhinolaryngology , 2011,
Abstract:
Heterotopic Oral Gastrointestinal Cyst: Report of Two Cases
Nona Zabolinejad,Mehran Hiradfar,Ehsan Khadivi,Mohammad Gharavi
Iranian Journal of Otorhinolaryngology , 2010,
Abstract: Introduction: Heterotopic gastrointestinal cyst of the oral cavity is an extremely rare lesion with fewer than 40 cases reported in the English literature. It usually involves the soft tissue covering the floor of the mouth and the tongue. Lining of this lesion resembles gastric or intestinal mucosa. Case Report: In this report we describe the lesion in two boys and discuss their pathogenesis.
Investigation of Tinnitus Characteristics in 36 Patients with Subjective Tinnitus with Unknown Etiology
Mahdi Bakhshaee,Mohammad mahdi Ghasemi,Ehsan Khadivi,Saman Rezaei
Audiology , 2006,
Abstract: Background and Aim: Tinnitus represents the perception of sound without an external stimulus. The prevalence of tinnitus ranges from 3% to 30%. In most cases its etiology is unknown. Tinnitus can be classified as pulsatile or nonpulsatile. Nonpulsatile form is the most common form and almost exclusively subjective in nature. There is a range of condition attributed to nonpulsatile high frequency tinnitus (acoustic neuroma, Meniere’s disease, ototoxic agents, and noise exposure, etc). There are many studies about form, site, loudness, and frequency of tinnitus and how it can affect the quality of patient life. Materials and methods: This was a descriptive and analytic study. Thirty-six patients (23 men and 13 women) with mean age 53.1 year old with subjective tinnitus evaluated in Pezhvak audiometric clinic in Mashhad.The data consisting of age sex, loudness, frequency form and site of tinnitus. Evaluation of effects of tinnitus on the quality of life and habits was performed with a tinnitus questionnaire (TQ). Results: Tinnitus was unilateral in 64% of cases. The right site was more common. Mean pitch was 7.03 kHz and average loudness was 3.8 dB SPL. SDS was in normal range in all of patients. There was a high frequency sensory neural hearing loss (above the 4 kHz) in most of the patients. The greatest score (60.3%) of TQ related to intrusiveness aspect. Sleep disorder has the lowest score (39/3%). Global score was 52.4%. Conclusion: Nonpulsatile subjective tinnitus has a broad range of etiology with unknown mechanism in most cases and without any history of underlying disease in a large group of patients. This symptom mostly involves the patients` lifestyle that is intrusiveness aspect in comparison with the other aspects including sleep, hearing and somatic complaints. There is no cure for most patient and more studies are needed in the future.
Detection of helicobacter pylori in benign laryngeal lesions by polymerase chain reaction: a cross sectional study
Farzad Izadi, Aslan Ahmadi, Shadi Ghourchian, Ahmad Daneshi, Faramarz Memari, Ehsan Khadivi, Shabahang Mohammadi
Infectious Agents and Cancer , 2012, DOI: 10.1186/1750-9378-7-10
Abstract: The samples were taken from 55 patients with benign laryngeal lesions and frozen in ?20°C. One milliliter (ml) of lysis buffer was added to 100 mg (mg) of each sample and the tube was placed in 56°C overnight. Then DNA extraction was carried out.To find HP DNA, in-house PCR was performed that revealed 5 positive results among 55 patients with benign laryngeal lesions. Of them, 3 were polyp, 1 was nodule and 1 was papilloma.Although the number of positive results was not a lot in this study, it was in contrast with previous studies which could not find any HP tracks in benign laryngeal lesions by other methods. More studies about the prevalence of HP in benign laryngeal lesions improve judging about the effect of this infection on benign laryngeal lesions.
Adaptive Wavelet Filtering for Data Enhancement in Wireless Sensor Networks  [PDF]
Ehsan Sheybani
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.22012
Abstract: Noise (from different sources), data dimension, and fading can have dramatic effects on the performance of wireless sensor networks and the decisions made at the fusion center. Any of these parameters alone or their combined result can affect the final outcome of a wireless sensor network. As such, total elimination of these parameters could also be damaging to the final outcome, as it may result in removing useful information that can benefit the decision making process. Several efforts have been made to find the optimal balance between which parameters, where, and how to remove them. For the most part, experts in the field agree that it is more beneficial to remove noise and/or compress data at the node level. We have developed computationally low power, low bandwidth, and low cost filters that will remove the noise and compress the data so that a decision can be made at the node level. This wavelet-based method is guaranteed to converge to a stationary point for both uncorrelated and correlated sensor data. This is mainly stressed so that the low power, low bandwidth, and low computational overhead of the wireless sensor network node constraints are met while fused datasets can still be used to make reliable decisions.
Real-Time Internet-Based Teleoperation  [PDF]
Ehsan Kamrani
Intelligent Control and Automation (ICA) , 2012, DOI: 10.4236/ica.2012.34041
Abstract: Internet-based teleoperation employs robots and internet a two breakthrough technologies to manipulate robots from distance for different applications. Variable and unknown time delay dynamics of internet is the main obstacle for realtime teleoperation via internet. In this paper the internet delay dynamics and its characteristics have been studied based on the measurement in different nodes. Then a black-box model for end-to-end internet delay dynamics has been developed using system identification and Auto-Regressive eXogeneous (ARX) model. Our experimental studies show a regular periodic behaviour in long-term intervals of internet delay variation and also confirm the accuracy and reliability of our theoretical and modelling derivations. This paper also introduces a novel multivariable control method for real-time telerobotic operations via Internet. Random communications delay of the Internet can cause instability in realtime closed-loop telerobotic systems. When a single identification model is used, it will have to adapt itself to the operating condition before an appropriate control mechanism can be applied. Slow adaptation may result in a large transient error. As an alternative, we propose to use a Multiple Model framework. The control strategy is to determine the best model for the current operating condition and activate the corresponding controller. We propose the use of Multi-Model Adaptive Control Theory and Multivariable Wave prediction method to capture the concurrency and complexity of Internet-based teleoperation. The results confirm the efficiency of the proposed technique in dealing with constant and variable delay dynamics of internet.
Adsorption of Cerium (IV) from Aqueous Solutions Using Activated Carbon Developed from Rice Straw  [PDF]
Ehsan Farahmand
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.63017
Abstract: In this study, the adsorption of Cerium from synthetic solution containing cerium oxide is investigated using activated carbon developed from rice straw that is activated by H3PO4. SEM and FTIR techniques are used to examine structural and morphological characteristics of rice straw and activated carbon. The optimum conditions obtained with the highest adsorption include contact time = 500 minutes, pH = 4, temperature = 35°C, cerium concentration = 300 ppm, and adsorbent dosage = 0.02 gr. The highest adsorption of Cerium is determined by 4.13 mg/g. Adsorption kinetics of cerium and equilibrium behavior is studied. It indicates that the adsorption process obeys Pseudo-first-order kinetic model and Langmuir isotherm model. The results of this study show that the activated carbon developed from rice straw activated by H3PO4 is a relatively effective adsorbent for the adsorption of cerium from aqueous solution.
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