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Search Results: 1 - 10 of 13338 matches for " Hisham El Shitany "
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Anterior Screw Fixation in Type II Odontoid Fractures: Keys for Better Outcome in Early Experience in Developing Countries  [PDF]
Ahmed El Fiki, Hisham El Shitany
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.84031
Abstract: Introduction: Representing up to 15% of cervical injuries, odontoid type II fractures may cause spinal cord compression through atlanto-axial instability. Anterior screw fixation provides direct fracture site stability, high fusion rate and most importantly keeping cervical spine move free. We will highlight success keys in early experience for better outcome. Methods: We operated ten cases with traumatic type II odontoid fractures in neurotrauma unit, Cairo University hospitals from March 2015 till June 2017. Six males and four females were included. Preoperative MRI and dynamic CT were among the assessment criteria. Uni-planner fluoroscopy was used. Results: No post-operative deficit appeared. One screw was inserted in all cases. Immediate and 6 weeks later CT cervical spine showed stable reduced fracture site. Conclusions: Anterior odontoid screw fixation done with prior good selection of the patient and fracture shape is an effective motion preserving surgical option for type II odontoid fractures. Limited resources shouldn’t prevent starting experience especially in developing countries, but larger studies are needed.
Decompressive Craniotomy and Fast-Track Duraplasty in Acute Subdural Hematomas  [PDF]
Ehab El Refaee, Ahmed Elsayed, Ahmed El-Fiki, Hisham El Shitany
Open Journal of Modern Neurosurgery (OJMN) , 2019, DOI: 10.4236/ojmn.2019.91005
Abstract: Background: Traumatic subdural hematoma is one of the severe injuries to brain with high mortality rates. Dural opening is often associated with brain herniation against the dural edges due to associated edema that would lead to venous infarction. Aim: The objective of this study is to describe a technical note that would allow fast and effective closure of the dura after hematoma evacuation via duraplasty with analysis of the safety and competency of the technique. Subjects and Methods: The fast-track technique was implemented in 15 successive cases with acute subdural hematoma where the fascia lata flap was prepared and sutured to the planned dural incision before opening the dura, which allowed fast and effective closure of the dura before brain herniation. Subdural bridges were planned by using Gelfoam to prevent venous compression. Analysis of the technique effectiveness was performed by the operative detection of brain herniation, as well as clinical and radiological follow-up of patients. Results: All patients had a Glasgow coma score (GCS) below six before the operation. Mean time from trauma to surgery was five hours. The dura could be effectively closed with no brain herniation in all cases. Nine patients survived (60%), where five of them ended up in a vegetative state. Of these two recovered and three continued in a persistent vegetative state. The mortality rate was 40%. Post-operative infarction was detected in post-operative imaging of four patients. Conclusion: The fast-track duraplasty technique is fast and effective in prevention of brain herniation during surgery with favorable clinical outcome in comparison with the poor and severely deteriorated preoperative clinical presentation. More studies to evaluate the impact of the technique on the survival rate are warranted.
An Index of Socio-Economic Well-Being of U.S. Farm Households  [PDF]
Hisham S. El-Osta
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.512104
Abstract: The primary purpose of the paper is to construct a combined index of quality-of-life and economic wellbeing based on national data from the 2004 Agricultural Resource Management Survey. Additional objective is to assess the role of increased utilization of various types of Federal farm programs in the context of the life-cycle on socioeconomic wellbeing. A central finding, which has implication for rural development and the continuity of the family farm, shows a positive relationship between increased intensity of farm program participation and higher likelihoods of socioeconomic wellbeing, particularly among elderly farmers.
Effect of Chloride Concentration on the Corrosion Rate of Maraging Steel  [PDF]
Hussam El Desouky, Hisham A. Aboeldahab
Open Journal of Physical Chemistry (OJPC) , 2014, DOI: 10.4236/ojpc.2014.44018
Abstract: The corrosion behavior of Maraging steel has been studied by using different techniques, including open circuit potential and polarization measurements in addition to microstructure examination such as optical microscopy and XRD (X-Ray Diffraction) investigation. The corrosion behavior of Maraging steel has been examined in sodium chloride solutions with different concentrations from 0.1 M to 2 M. It was found that the corrosion resistance of Maraging steel is inversely proportional with the concentration of sodium chloride solution. The corrosion resistance is directly proportional to the Mo and Ti content in the Maraging steel. Heat treatment of the Maraging steel improved its mechanical properties with no effect on the corrosion behavior as the precipitation of inter-metallic compounds leading to some galvanic action. However, sample IV having lower Mo content than sample V showed after heat treatment an improvement in the corrosion resistance.
Sanjad-Sakati Syndrome Dental Management: A Case Report
Hisham Y. El Batawi
Case Reports in Dentistry , 2013, DOI: 10.1155/2013/184084
Abstract:
Fast Implementation of VC-1 with Modified Motion Estimation and Adaptive Block Transform  [PDF]
Michael Tammen, Mohamed El-Sharkawy, Hisham Sliman, Maher Rizkalla
Circuits and Systems (CS) , 2010, DOI: 10.4236/cs.2010.11003
Abstract: The Society of Motion Picture and Television Engineers (SMPTE) Standard 421M, commonly known as VC-1, is a state-of-the-art video compression format that provides highly competitive video quality, from very low through very high bit rates, at a reasonable computational complexity. First, this paper presents fast motion compensation methods. The four motion estimation methods examined are fast, three step search, varying diamond, and 2D logarithmic. These methods use less search points than the full spiral scan used in the VC-1 reference software, which allows for faster motion estimation. Second, this paper presents a residual texture based choice of the block size for the Discrete Cosine Transform (DCT). To determine the block size, data is examined after the residual texture has been calculated. This is in contrast to the VC-1 reference software, which uses calculations at the block level to determine the block size. The residual texture of each block is small and uniform, allowing for simplified block choices.
Intensity of Off-Farm Employment and Its Impact on Wage Distribution: Does the Source of Health Insurance Coverage Matter?  [PDF]
Hisham S. El-Osta
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.76116
Abstract: The determinants of off-farm wages, with emphasis on the role of working full-time off the farm, are examined using data from the 2015 Agricultural Resource Management Survey and quantile regression. The targeted groups of farm operators for the analysis are based on whether health insurance coverage is obtained from the off-farm employer, and whether it is obtained from other sources. Findings indicate a negative association between full-time off-farm work and off-farm wages among farm operators in both categories who are at the higher portions of their respective off-farm wage distributions, which is in accordance with the compensating differential prediction.
Management of 634 Consecutive Patients with Chronic Pilonidal Sinus: A Nine-Year Experience of a Single Institute  [PDF]
Mahmoud F. Sakr, Mohamed E. Elserafy, Hossam M. Hamed, Mohammad A. Ramadan, Hisham E. Kantoush, Hisham M. El-Torky
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.33029
Abstract: Objectives: Different surgical techniques, with variable morbidity and recurrence rates, have been advocated for the management of chronic pilonidal sinus (PNS). This study was conducted to report the outcome of surgical treatment of 634 cases of chronic PNS at a single institute between January 2001 and January 2010. Methods: Karydakis flap was performed in 244 patients (38.5%, Group 1). Excision and midline closure was performed in 371 patients (58.5%, Group 2), while the open method was used in 19 (3.0%). Data regarding patient and sinus characteristics, operative de-tails, postoperative course, complications and recurrence were recorded. Mean follow-up was 73.5 months. Results: 571 patients were male (90.1%) and 63 were female (9.9%). Their ages ranged between 16 - 44 years (mean 25.7 years). The mean body mass index was 31.2 (range 23.6 - 41.9), and 71.5% (453/634) were hirsute. Chronic PNS was the first presentation (primary) in 504 patients (79.5%) and recurrent in 130 (20.5%).Overall complication rate was 16.1% (102/ 634) and overall recurrence rate was 8.4% (53/634). Comparing both groups showed that they were similar regarding demographic characteristics, clinical presentation, hospital stay, healing time and time off work. Operative time was insignificantly longer with Karydakis technique (mean 43.2 versus 39.1 minutes, respectively). Complications were sig-nificantly more in patients with midline closure (21%, 78/371) as compared with Karydakis procedure (9%, 22/244) (P = 0.0001). Likewise, there was a significantly (P = 0.0001) higher rate of recurrence with midline closure (12.1%, 45/371) as opposed to Karydakis technique (2.5%, 6/244). Conclusions: 1) PNS affects mainly young male adults who are usually, obese and hirsute, 2) Karydakis technique for the management of chronic PNS, whether primary or recurrent, is a non-lengthy, efficient procedure that has less overall complications and a lower recurrence rate than conventional excision and midline closure.
Biological Hydrogen Production from Corn-Syrup Waste Using a Novel System
Hisham Hafez,George Nakhla,Hesham El Naggar
Energies , 2009, DOI: 10.3390/en20200445
Abstract: The reported patent-pending system comprises a novel biohydrogen reactor with a gravity settler for decoupling of SRT from HRT. The biohydrogenator was operated for 100 days at 37 °C, hydraulic retention time 8 h and solids retention time ranging from 2.2–2.5 days. The feed was a corn-syrup waste generated as a byproduct from an industrial facility for bioethanol production located in southwestern Ontario, Canada. The system was initially started up with a synthetic feed containing glucose at concentration of 8 g/L and other essential inorganics. Anaerobicaly-digested sludge from the St. Mary’s wastewater treatment plant (St. Mary, Ontario, Canada) was used as the seed, and was heat treated at 70 °C for 30 min to inhibit methanogens. After 10 days, when the hydrogen production was steady, the corn-syrup waste was introduced to the system. Glucose was the main constituent in the corn-syrup; its concentration was varied over a period of 90 days from 8 to 25 g/L. The change in glucose concentration was used to study the impact of variable organic loading on the stability of hydrogen production in the biohydrogenator. Hydrogen production rate increased from 10 L H 2/L·d to 34 L H 2/L·d with the increase of organic loading rate (OLR) from 26 to 81 gCOD/L·d, while a maximum hydrogen yield of 430 mL H 2/gCOD was achieved in the system with an overall average of 385 mL H 2/gCOD.
A Clinic-Epidemilogical Study of Cases of Locally Advanced Non Small Cell Lung Cancer (NSCLC) That Received Radiotherapy at NCI Cairo in the Period from 2001-2010  [PDF]
Mohamed Lotayef, Azza Taher, Hanna Attia, Azza Nasr, Hisham El Hossieny, Mohammed Mahmoud, Noha Essam
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.56062
Abstract:

Purpose: This work was to study the clinic-epidemiological characteristics of patients with locally advanced NCSLC and to analyze their prognostic factors and also the results of different treatment modalities for local control and their effect on overall survival (OAS). Materials and Methods: This is a retrospective study including 121 patients with primary locally advanced NSCLC diagnosed between 2001 and 2010 at the radiotherapy department , National Cancer Institute, Cairo University, Egypt. Results: The study showed significant correlation between the tumor size < 7 cm, old age > 60, moderately differentiated tumors G2 and treatment outcomes; better locoregional control and better survival rates. On the opposite side poorly differentiated tumors G3, tumor size > 7 cm had the worst locoregional control and survival rates. The study also showed significant statistical correlation between treatment modality, locoregional control and survival rates. Patients who were treated by either concommitent chemo-radiotherapy or sequential chemo-radiotherapy had better local control compared to other patients who were treated by radical radiotherapy, and they also had the best survival rates among all the other treatment groups. The average 6 months OAS rates for all studied patients were 60.3% while 12 months survival rates were 38.8%. The median OAS was 7 months. Conclusions: From the present study, we concluded that concomitant chemo-radiotherapy is the treatment of choice for locally advanced non small cell lung cancer; also we concluded that better performance status and higher hemoglobin levels have better treatment outcome in these cases.

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