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Search Results: 1 - 10 of 9070 matches for " Fethi Ben Hamida "
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Impact of Dialysis Modality on Kidney Transplantation Outcomes  [PDF]
Imed Helal, Imen Gorsane, Fethi Ben Hamida, Adel Kheder
Journal of Biomedical Science and Engineering (JBiSE) , 2015, DOI: 10.4236/jbise.2015.82007
Abstract: Survival benefits of renal transplantation over dialysis therapy are well established for patients with end-stage renal disease (ESRD). Transition from one treatment modality to another is common. Understanding the differences in outcomes with the various renal replacement therapies will help nephrologists to provide best advice for dialysis patients. The influence of pretransplant dialysis modality on post-transplant outcomes is not clear. An overview of the various issues related to dialysis modality on kidney transplantation outcomes is discussed in this topic review. These include allograft and recipient survival, the impact of dialysis vintage and choice of dialysis modality on transplant outcomes.
Amylo?dosis Complicating Behcet’s Disease  [PDF]
Amel Harzallah, Hayet Kaaroud El Jery, Mariem Hajji, Ikram Mami, Rim Goucha, Sami Turki, Fethi Ben Hamida, Madiha Mahfoudhi, Taieb Ben Abdallah
Open Journal of Clinical Diagnostics (OJCD) , 2016, DOI: 10.4236/ojcd.2016.63008
Abstract: Background: Behcet’s disease is a vasculitis affecting several organs. A renal involvement is rarely described. It is most of the time about a renal amyloidosis. Patients and methods: It is a descriptive retrospective study concerning the patients followed in our department for a Behcet’s disease having presented a renal amyloidosis. Results: It is about 4 men with average age of 38.25 years old. The renal involvement was revealed after an average delay of 5.7 years by a nephrotic syndrome in all cases. A renal insufficiency was noted in 3 cases with an average serum creatinine of 587 μmol/l (127 - 1490). The type of the amyloidosis was AA in 2 cases. The treatment contained colchicines in every case. The evolution was marked by the worsening of the renal function leading to end stage renal disease in 3 cases. Death occurred in 1 case and one patient lost to follow up. Discussion: Renal amyloidosis can complicate the evolution of a Behcet’s disease. It occurs generally 1 to 10 years after the beginning of the disease. Once installed, it evolves generally towards the chronic renal insufficiency and can condition the forecast of this affection. Conclusion: Amyloidosis is a rare complication of the Behcet’s disease. Its screening is so desirable to improve the renal prognosis of these patients.
The Pedagogical Innovation Serving Technological Education  [PDF]
Sameh Ben Hamida, Alia Maaloul, Sana Ben Hamida
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.71003
Abstract: It is now recognized that the learner is no longer passive, he becomes the main actor of his training. There are, in fact, the part of the learner, an appropriation work that is taking place and the trainer, a specific work to promote learning. In order to offer to our students a better education, we began to discover some techno approaches crossing innovative teaching and set up two educational modalities that we experienced in Institute of Higher Technological Studies IHTS of Gabes for the students having speciality of telecommunications and networking by the introduction of flipped classroom and serious games. This was followed by a comparison of different pedagogical approaches tested to detect their contributions and limitations.
Intelligent System of M-Vision Based on Optimized SIFT  [PDF]
Sameh Ben Hamida, Ridha Azizi, Alia Maaloul
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.44005
Abstract: This paper proposes the recognition of bank notes through a mobile intelligent vision system under Android and this, based on an?approach of artificial vision of images using the SIFT algorithm under OPENCV whose principle is to detect the remarkable points of this image and compare it with the image saved in the local database on a handheld device. Finally, the system informs the user of the result by a sound indicating the value of the currency detected. The SIFT algorithm proposed can achieve a higher percentage of identification in a reduced time compared to results achieved by classic SIFT.
Experimental Studies of a Passive Cooling Roof in Hot Arid Areas
Hamida Ben Cheikh and Ammar Bouchair
The Open Fuels & Energy Science Journal , 2008, DOI: 10.2174/1876973X00801010001]
Abstract: An experimental study of passive cooling roof was carried out for a typical summer day of June for Laghouat in Algeria. The proposed roof design is composed of a metal plate ceiling over which lies a bed of rocks in a water pool. Over this bed is an air gap separated from the external environment by an aluminium plate. The upper surface of this plate is painted with a white titanium-based pigment to increase the radiation reflection process during daytime. Several passive modifications have been introduced to the roof in order to reduce indoor air temperature in hot climates. An experimental investigation, employing passive procedure, has been carried out to study the possibility of reducing air temperature in buildings. The results show that the air temperature can decrease with a range from 6 to 10°K. This decrease can further be lowered by 2 to 3°C if night natural ventilation of buildings is allowed.
Noise Robust Isolated Word Recognition Using Speech Feature Enhancement Techniques
M. Frikha,A. Ben Hamida
Journal of Applied Sciences , 2007,
Abstract: This study examines the problem of Automatic Speech Recognition (ASR) in the presence of additive interfering noise. It investigates several noise reduction techniques which are integrated into the front end of a Hidden Markov Model (HMM) isolated word recognition in order to guarantee high performance and robust recognition system. The algorithms inherent to these techniques are studied from a theoretical view point. Their implementation is described and they are tested on the TIMIT database for an isolated word recognition task. Computer experiments were carried out on both clean and noisy words using four kinds of acoustic features. Our first experiment on clean conditions showed the best performance of static acoustic features augmented by the frame’s log energy and their first derivatives coefficients. The robustness of these kinds of features was tested in the second experiment. The observed average loss of performance for the perceptually based acoustic features ranges from 15 to 65% for SNR ranging from 20 to 0 dB. In the last experiment, the evaluation of two speech enhancement techniques was performed. Results revealed the effectiveness of these two techniques in such application. In fact, a maximum relative recognition rate improvement of performance up to 35% for SNR of 0 dB is obtained and this with respect to the results obtained in the second experiment.
Hydrochemical and Isotopic Study of Groundwater in the North Djeffara Aquifer, Gulf of Gabès, Southern Tunisia  [PDF]
Mohamed Fethi Ben Hamouda, Ahmed Mamou, Jelloul Bejaoui, Klaus Froehlich
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.48A001
Abstract:

The northern Djeffara aquifer system is located in the southeast ofTunisiaand extends over an area of400 km2. This multilayer system of aquifers is essentially recharged by infiltration of rain and by groundwater of the Continental Inter-calaire aquifer, and occurs mainly at two levels between 0 and180 mdepth that belong to the Mio-Pliocene to form the aquifers. A combined hydrogeologic and isotopic investigation using several chemical and isotopic tracers’, i.e., major ions, δ18O, δ2H and tritium, was carried out in order to determine the sources of water recharge to the aquifer and the origin of salinity. The results of geochemical and isotopic studies show that the groundwater in the south of the study area represents a mixture of the Djeffara aquifer groundwater and locally infiltrates modern recharge. In the northern part, the groundwater which resembles that of the Sekhira aquifer originates from locally infiltrated rain and runoff. The salinity of the groundwater is caused by dissolution of evaporate rocks (gypsum and halite minerals) in the aquifer system. The stable isotopes data do not support the hypothesis of mixing with seawater.

Acute rejection episodes after kidney transplantation
Hamida Fethi,Barbouch Samia,Bardi Rafika,Helal Imed
Saudi Journal of Kidney Diseases and Transplantation , 2009,
Abstract: Acute rejection episodes (AREs) are a major determinant of renal allograft survival. The incorporation of new immunosuppressive agents explains, at least partially, the improvement seen in the results of transplantation in recent years. The objectives of this study are to analyze the incidence and severity of AREs, their risk factors and their influence on graft and patient survival. We retrospectively studied 280 kidney transplants performed in adults at the Charles Nicolle Hospital, Tunis, between 1986 and 2004. The diagnosis of ARE was based on clinical data and response to treatment. Allograft biopsies were performed in ten cases. The treatment of AREs consisted of pulse methylprednisolone and anti-thymocyte globulin. There were 186 males (66.4%) and 94 females (33.6%), and their mean age was 31 ± 8.9 years. Overall, the 280 study patients experienced a total of 113 AREs. Of them, 85 had only one ARE, 28 had two to three and none had more than three AREs. A total of 68 AREs were completely re-versible, 42 were partially reversible while three could not be reversed with treatment. The mean inci-dence of AREs was 40.4%. The incidence was > 45% between 1986 and 1997, decreased to 20.5% between 1998 and 2000 and to 9% between 2001 and 2004. Graft survival rates in patients with and without AREs were respectively 91% and 93% at three years, 82% and 90% at five years and 73% and 83% at 10 years. We found a decrease in the incidence of AREs in recent years in our study patients, and this was related to the introduction of sensitized cross-match and the newer immunosuppressive agents, particularly MMF. Additionally, AREs had a deleterious impact on late graft survival in our study population.
Effect of Sevelamer on Mineral and Lipid Abnormalities in Hemodialysis Patients
Hamida Fethi,Fatma Lilia,Barbouch Samia,Kaaroud Hayet
Saudi Journal of Kidney Diseases and Transplantation , 2008,
Abstract: We conducted a prospective study in hemodialysis patients to assess the safety and efficacy of sevelamer, a non-absorbable phosphate binding polymer free of calcium and aluminum, in lowering serum phosphorus, serum intact parathyroid hormone, and serum lipids. Phosphate binders were discontinued during a two-week washout period. We considered the patients with serum phosphorus levels more than 1.8 mmol/l during the washout period eligible for treatment. Sevelamer was administered to 29 hemodialysis patients for eight weeks. Sevelamer reduced the mean serum phosphorus levels to 1.8 mmol/l by the end of the eight-week treatment period (p < 0.0001). Two weeks after the completion of the sevelamer study the mean serum phosphorus levels increased to 2.09 mmol/l (p < 0.02). Mean serum calcium levels did not significantly change during sevelamer trial. Mean serum intact parathyroid hormone declined from 501 pg/ml at the start of the study to 425 pg/l at the end of the eight week treatment period (p = 0.05). In addition, sevelamer reduced the mean serum total cholesterol levels from 5.22 mmol/l to 4.26 mmol/l (p < 0.0001), and the mean serum low density lipoprotein cholesterol from 3.56 mmol/l to 2.79 mmol/l (p < 0.0001) at the end of the study. However, the mean serum levels of high density lipoprotein and triglycerides did not change during the study period. We conclude that sevelamer can control serum phosphorus and reduce the level of intact parathyroid hormone and cholesterol without inducing hypercalcemia or other side effects.
Cardiovascular risk factors in hemodialysis and peritoneal dialysis patients
Helal Imed,Smaoui Wided,Hamida Fethi,Ouniss Monder
Saudi Journal of Kidney Diseases and Transplantation , 2010,
Abstract: Cardiovascular diseases are a major cause of morbidity and mortality in patients with end-stage renal disease (ESRD). The aim of our investigation was the evaluation of an extensive cardiovascular profile in hemodialysis (HD) and peritoneal dialysis (PD) patients. We studied 74 patients with ESRD (38 males, 36 females), maintained either on chronic HD (n= 50) or chronic PD (n= 24) and age and sex matched 20 healthy subjects as controls. The lipid profile, homo-cysteine (Hcy) and C reactive protein (CRP) were measured. When compared to a healthy popu-lation, HD patients displayed a marked atherogenic profile, as attested by increased levels of total cholesterol (TC), triglycerides (TG), low-density lipoprotein-cholesterol (LDL-C), apolipoprotein A (Apo A), CRP, Hcy and lower concentrations of high-density lipoprotein-cholesterol (HDL-C), Apo B, albumin (ALB). A significant difference was noted concerning the rates of Apo B, HDL-C, TC, ALB and Hcy. Same biological disorders that those found at HD patients were noted in these PD patients. One also noted lower concentration in Apo A. there were a significant diffe-rence with the reference group concerning the rates of albumin, Apo A, HDL-Cl and Hcy. When compared to PD patients, HD patients had significantly decreased concentration of LDL-C. The peculiar metabolic changes observed in the present study confirm the marked tendency of patients with impaired renal function for developing cardiovascular diseases, irrespectively of the type of dialysis. We suggest including uremia-related risk factors in the panel for evaluation of cardio-vascular risk in dialysis patients.
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