Ahmed Abdelaal - Academia.edu (original) (raw)

Papers by Ahmed Abdelaal

This study describes the ultrasonographic findings of the urinary tract of buffalo calves suffere... more This study describes the ultrasonographic findings of the urinary tract of buffalo calves suffered from urine retention. In this study, 25 male buffalo calves with urine retention and 8 apparently clinically healthy male buffalo calves were used. All calves were subjected to thorough clinical and ultrasonographic examinations. Based on the clinical findings, the diseased calves were classified into four groups. The first group included 8 calves with severe abdominal pain and absence of urine outflow, second group included 5 calves with mild abdominal pain and absence of urine outflow, third one included 8 calves with absence of both pain reactions and urine outflow and finally, fourth group included 4 calves with severe abdominal pain and dribbling of bloody urine. Both transcutaneous and transrectal ultrasonographic examinations were carried out by using 3.5-5.0 MHz convex and 6-8 MHz linear transducers. Ultrasonographic examination revealed distended urinary bladder in first, seco...

Al-Azhar Assiut Medical Journal, 2021

Background Dacryocystorhinostomy (DCR) is an operation that creates a lacrimal drainage pathway i... more Background Dacryocystorhinostomy (DCR) is an operation that creates a lacrimal drainage pathway into the nasal cavity to facilitate drainage of the previously obstructed excreting system. Objective To compare effectiveness and complications of external and endoscopic DCR for treatment of primary acquired [nasolacrimal duct obstruction (NLDO)]. Patients and methods The present study included 60 patients (38 females and 22 males) aged between 18 and 50 years complaining of epiphora owing to NLDO. Patients were subdivided into two groups: group A included 30 (50%) eyes of 25 patients who were subjected to endoscopic DCR, and group B included 30 (50%) eyes of 27 patients who were subjected to external DCR. Results In this study, the right eye was more commonly affected than left eye. The percentage of right eye affection was 53.3% and left eye affection was 33.3%%. Massive intraoperative bleeding in group A was seen in five (16.5%) cases, whereas in group B, massive intraoperative bleed...

Some patients developed shoulder imbalance after selective anterior correction of lumbar scoliosi... more Some patients developed shoulder imbalance after selective anterior correction of lumbar scoliosis with spontaneous rebalances later on. We conducted this retrospective radiographic analysis study to study the effect of selective anterior correction of thoracolumbar and lumbar scoliosis on shoulder balance. Standing X-ray films of 15 patients with lumbar scoliosis operated by anterior correction at preoperative, 3, 6 & 12 months postoperative were used. Spine and shoulder balance parameters were measured. Correlations between changes in shoulder balance and spine parameters were evaluated. Shoulder height parameters showed early postoperative change from positive or neutral to negative shoulder balance, Lumbar and thoracic Cobb angles showed immediate postoperative improvement with a slight later increase contributing to shoulder rebalance mechanisms. Changes in T1 tilt was correlated to change in thoracic Cobb angle at 3 months post op. (r= 0.515 p =.049), CRCI was correlated to di...

Advances in Animal and Veterinary Sciences, 2020

A bdominal distension is a common manifestation of many digestive and non-digestive disorders in ... more A bdominal distension is a common manifestation of many digestive and non-digestive disorders in cattle (Peek and Divers, 2018). Over distension of the rumen either with gases resulting from fermentation as in the case of tympany (bloat), or food as in case of impaction are the main causes of abdominal distension in ruminants (Radostits et al., 2007). Bloat may be primary or secondary in origin (Singh et al., 1993). Primary bloat (frothy tympany) is due to feeding of alfalfa hay and clover. Secondary bloat (free gas tympany) may be due to stenosis of the esophagus (

This paper analyzes the effect of signal transfer function (STF) peaking in continuous-time (CT) ... more This paper analyzes the effect of signal transfer function (STF) peaking in continuous-time (CT) Delta-Sigma- Modulators (DSMs) arising from excess loop delay (ELD) and its compensation. Starting from a generic model, the origin of different contributors to STF peaking are revised, namely noise transfer function (NTF) peaking due to aggressive noise shaping, instability from uncompensated delay as well as forward loop filter zeros in cascade-of-integrators with distributed feedforward (CIFF) modulators. The shift of forward loop filter zeros as a result of ELD compensation is shown intuitively for a 3rd order example, while system-level simulations of various 2nd, 3rd and 4th order CT single-loop modulators confirm increased STF peaking in the above stated scenarios.

Received: Revised: Accepted: September 03, 2013 April 14, 2014 May 07, 2014 This study was conduc... more Received: Revised: Accepted: September 03, 2013 April 14, 2014 May 07, 2014 This study was conducted to investigate the ultrasonographic findings of diaphragmatic hernia (DH) in buffaloes. Each 10 of healthy non pregnant, pregnant and buffaloes with DH were investigated. The most observed signs of DH were dullness, depression, inappetence, tympany and scanty feces. Reticulum of all buffaloes with DH was detected at the level of 4th/5th intercostal space (ICS) by ultrasonography. Contraction manner was either biphasic (n=6), monophasic (n=2) or non-motile (n=2). Contraction frequency was either reduced (n=6), normal (n=2) or increased (n=2). Also, hypoechoic inflammatory adhesion was found between reticulum and thoracic organs (n=6). Herniated reticulum was imaged beneath lung (n=6) and beneath heart (n=4). Hemato-biochemical analyses revealed significant elevations in total leucocytes, total protein, globulin and fibrinogen in comparison with control groups. Collectively, not only u...

Aim: This study was designed for the 1st time to describe the normal head structures of one-humpe... more Aim: This study was designed for the 1st time to describe the normal head structures of one-humped camel (Camelus dromedarius) using both magnetic resonance imaging (MRI) and computed tomography (CT) as well as cross-sectional anatomy. Materials and Methods: Five fresh cadaver heads were collected from clinically normal camels and then subjected to T1-weighted MR and CT imaging. Afterward, these examined heads were transversely sliced to obtain seven crossing levels. Results: The obtained structures per each crossing level were matched with their relevant sorted images of T1-weighted MRI and CT, then identified and labeled accordingly. Conclusion: The data shown herein expand our knowledge of the normal head structures of the camel and could be used as a reference for ultimate diagnosis of the surgical affections of head using MRI and/or CT.

The precise control for the equivalent circulating density (ECD) will lead to evade well control ... more The precise control for the equivalent circulating density (ECD) will lead to evade well control issues like loss of circulation, formation fracturing, underground blowout, and surface blowout. Predicting the ECD from the drilling parameters is a new horizon in drilling engineering practices and this is because of the drawbacks of the cost of downhole ECD tools and the low accuracy of the mathematical models. Machine learning methods can offer a superior prediction accuracy over the traditional and statistical models due to the advanced computing capacity. Hence, the objective of this paper is to use the artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) techniques to develop ECD prediction models. The novel contribution for this study is predicting the downhole ECD without any need for downhole measurements but only the available surface drilling parameters. The data in this study covered the drilling data for a horizontal section with 3,570 readings ...

The Pediatric and Adolescent Hip

Traumatic hip dislocation in children is rare and the goal is to reduce the hip urgently. This ca... more Traumatic hip dislocation in children is rare and the goal is to reduce the hip urgently. This can be achieved under conscious sedation in the emergency department or under general anaesthesia in the operating room. The most commonly encountered complications are non-concentric reduction, AVN, coxa magna, traumatic proximal epiphysiolysis and recurrent hip dislocation. Associated injuries and neurovascular complications (such as sciatic nerve injury) are rarely encountered in pediatric patients because of the relatively low energy trauma that is required to dislocate the hip. As a result, the outcomes of traumatic hip dislocation in children are typically better than in adults.

$Research paper thumbnail of Functional bracing is a safe and cost effective treatment for isolated Weber B fracture$

BackgroundDespite the current recommendations that stable Weber B ankle fractures can be treated ... more BackgroundDespite the current recommendations that stable Weber B ankle fractures can be treated with functional bracing and weightbearing as tolerated, some reluctance exists among trauma surgeons to follow these recommendations. We report on our institution’s experience in managing these injuries and compare it to the national guidelines.Patients and MethodsConsecutive patients with isolated Weber B fractures referred to the local outpatient clinic over the period of six months were included in the study. Radiographs and clinic letters were examined, the patients were interviewed via telephone to obtain outcome scores (Olerud and Molandar score). Method of immobilisation, weightbearing status, radiological fracture union, clinical outcomes and complications were all assessed and analysed.ResultsOne hundred and twenty-three patients with isolated Weber B fractures were identified. This cohort of patients did not show clinical or radiographic evidence of instability, they were deeme...

Veterinary World, Jun 12, 2019

Background and Aim: Knowledge of normal ultrasonographic dimensions of the liver and associated v... more Background and Aim: Knowledge of normal ultrasonographic dimensions of the liver and associated vascular structures is an important indicator for the diagnosis of hepatic diseases. Enlargement of the liver beyond its normal dimensions is the term of hepatomegaly and ultrasonography is the primary and the suitable diagnostic technique for this condition. Therefore, this study aimed to describe the clinical and ultrasonographic findings of liver diseases causing hepatomegaly in 30 buffaloes as well as to provide a range of liver dimensions and its blood vessel measurements in normal and diseased buffaloes. Materials and Methods: The study population included 30 buffaloes that were admitted to the clinic of the Faculty of Veterinary Medicine - Zagazig University for investigation of clinical signs associated with gastrointestinal diseases such as anorexia, chronic weight loss, and variable degrees of diarrhea or constipation. The animals were subjected to thorough clinical and ultrason...

Advanced materials (Deerfield Beach, Fla.), Jan 14, 2018

2D nanomaterials are finding numerous applications in next-generation electronics, consumer goods... more 2D nanomaterials are finding numerous applications in next-generation electronics, consumer goods, energy generation and storage, and healthcare. The rapid rise of utility and applications for 2D nanomaterials necessitates developing means for their mass production. This study details a new compressible flow exfoliation method for producing 2D nanomaterials using a multiphase flow of 2D layered materials suspended in a high-pressure gas undergoing expansion. The expanded gas-solid mixture is sprayed in a suitable solvent, where a significant portion (up to 10% yield) of the initial hexagonal boron nitride material is found to be exfoliated with a mean thickness of 4.2 nm. The exfoliation is attributed to the high shear rates (γ˙ > 10 s ) generated by supersonic flow of compressible gases inside narrow orifices and converging-diverging channels. This method has significant advantages over current 2D material exfoliation methods, such as chemical intercalation and exfoliation, as w...

Asian Journal of Animal and Veterinary Advances, 2016

SICOT-J, 2016

Introduction: Differences in the magnitude of bowing between races are well-known characteristics... more Introduction: Differences in the magnitude of bowing between races are well-known characteristics of the femur. Asian races have an increased magnitude of femoral bowing but most of the orthopedic implants designed for the femur do not match this exaggerated bowing. We calculated the sagittal and coronal femoral bowing in the Japanese population at different levels of the femur and addressed its surgical significance. Material and methods: We calculated the sagittal and coronal bowing of 132 Japanese femora using CT scan of the femur. A mathematical calculation of the radius of curvature at proximal, middle, and distal regions of the femur was used to determine the degree of femoral bowing. Results: Mean sagittal bowing of the femur was 581, 188, and 161 mm for the proximal, middle, and distal thirds of the femur and mean lateral bowing was 528, 5092, and 876 mm, respectively. Mean sagittal and coronal bowing for the whole femur was 175 and 2640 mm, respectively. No correlation was found between age, gender, length of femur, and the degree of bowing. Conclusion: Our study reveals that femoral bowing in the Japanese population is 175 mm in the sagittal plane and 2640 mm in the coronal plane; these values are greater than the femoral bowing in other ethnic groups studied in the literature. This may result in varying degrees of mismatch between the western-manufactured femoral intramedullary implants and the Japanese femur. We recommend that orthopedic surgeons to accurately perform preoperative evaluation of the femoral bowing to avoid potential malalignment, rotation, and abnormal stresses between the femur and implant.

This experiment was conducted in a private apiary at Sharkia and Dakahlia governorates during the... more This experiment was conducted in a private apiary at Sharkia and Dakahlia governorates during the years 2011, 2012.To study the effect of legislation issued by the Egyptian Ministry of Agriculture in the field of bees on productivity and biometric attributes of honeybee queens. The results revealed that the legislative intervention and not to allow the import of queens from abroad led to the weakening of the productivity of queens and biometric attributes of the imported strains Italian, Carniolian , which in turn has affected the productivity of honey and broods within colonies under test. Find recommended reviewing this legislation to Egypt importance of the site allows them the ability to issue packed production of bee honey and high import queens of modern productivity without the monopoly of the Ministry of Agriculture for this import.

Journal of Radiology Case Reports, 2012

We report a case of a large, heterogeneously enhancing, pathologically proven, supratentorial sub... more We report a case of a large, heterogeneously enhancing, pathologically proven, supratentorial subependymoma in a 31-year-old male patient presenting with headache, nausea and vomiting as well as gait disturbances. Although most supratentorial subependymomas have distinctive MR features, our case demonstrated imaging findings that made it indistinguishable from other more aggressive malignant supratentorial intraventricular lesions. It is of paramount importance to consider supratentorial subependymomas in the differential diagnosis of supratentorial lesions, even if their radiological features were atypical. CASE REPORT A 31-year old male patient presented with headache, nausea and vomiting, as well as gait disturbances and speech problems. The patient had no co-morbidities. MRI was performed prior to any surgical intervention on 1.5 Tesla scanners. The imaging protocol consisted of; Sagittal T1, axial T1, axial FLAIR and axial T2-weighted images, as well as, contrast-enhanced axial and coronal T1-weighted images. Axial diffusion weighted sequence and post contrast dynamic susceptibility contrast perfusion imaging (DSCI) were also obtained.

Pace-pacing and Clinical Electrophysiology, 2008

Background: The survival of patients with idiopathic dilated cardiomyopathy (IDCM) at III and IV ... more Background: The survival of patients with idiopathic dilated cardiomyopathy (IDCM) at III and IV stages of New York Heart Association (NYHA) is decreased in those with a bundle branch block (BBB) compared to those without BBB. Less is known on the prognosis of patients at earlier stages of NYHA and who had a left BBB (LBBB) or right BBB (RBBB). We sought to evaluate the prevalence and the clinical significance of LBBB or RBBB in patients with IDCM and classes I and II of NYHA. Methods: Clinical data, noninvasive, and invasive studies were consecutively collected in 310 patients, with IDCM, followed up to 4.8 ± 3.7 years. Results: Seventy-six patients (25%) had LBBB, 21 (7%) had RBBB, and 212 had no BBB. Patients with BBB were older than other patients (P < 0.009). Left ventricular ejection fraction (LVEF) was lower in LBBB than in RBBB and other patients (P < 0.05). Syncope was more frequent in BBB than in absence (P < 0.05). Incidence of spontaneous ventricular tachycardia (VT) and atrial fibrillation, VT induction, total cardiac events, and sudden death were similar in the presence or absence of BBB. Deaths by heart failure and heart transplantations tended to be more frequent in BBB than in absence. Conclusions: LBBB was present in 25% of patients with IDCM; RBBB was rare. Patients with BBB were older and had more frequent syncope than patients without BBB; LVEF was lower in LBBB than in RBBB or in absence of BBB. BBB did not increase the risk of spontaneous VT, VT induction, or sudden death, and tended to increase deaths by heart failure and the indications of heart transplantation.

Journal of Medical Virology, 1988

Conventional tube cell culture has been recognised as the most sensitive technique available for ... more Conventional tube cell culture has been recognised as the most sensitive technique available for human cytomegalovirus (HCMV) detection. Low-speed centrifugation of specimen inocula onto cell culture monolayers has been shown to increase the efficiency of infection with the AD 169 strain of HCMV. Therefore a centrifugal force of 900g for 1 hour at 37°C was used to enhance the detection of HCMV cytopathic effect (CPE) in shell vials that contained circular coverslips with a monolayer of human embryonic lung (HEL) fibroblasts. Of 195 specimens, HCMV CPE was detected in 18 specimens (9.02%) on shell vial culture assay, whereas conventional tube cell culture was positive in only 13 specimens (6.6%). The shell vial culture assay was significantly more sensitive (P < 0.05). Furthermore the development of the cytopathic effect on shell vial culture assay was significantly earlier (P < 0.01) and more extensive. Urine samples were sonicated and the results obtained with immunofluorescence using human immune serum demonstrated that sonication increased both the intensity of fluorescence and number of fluorescent foci of HCMV-infected cells and also decreased the nonspecific fluorescence of the background.