Assem Mahmoud - Academia.edu (original) (raw)

Papers by Assem Mahmoud

Al-Azhar Medical Journal, 2022

Background: Lumbosacral transitional variations (LSTVs) are common within the spine, including sa... more Background: Lumbosacral transitional variations (LSTVs) are common within the spine, including sacralization of the lowest lumbar vertebral body and lumbarization of the uppermost sacral segment. Low back pain associated with an LSTV may arise from the level above the transition. LSTVs are common in the general population. LSTVs have been classically described as being best imaged on Ferguson radiographs. Symptoms can originate from the anomalous articulation itself, the contralateral facet joint, instability and early degeneration of the level cephalad to the transitional vertebrae, and nerve root compression from hypertrophy of the transverse process. Objective: To highlight the variations of lumbosacral anatomy. Materials and methods: We conducted a comperhensive electronic search in Pubmed, MEDLINE and Chocrane library databases, for articles that published between December 2003 and December 2018 using these keywords: lumbar and sacral vertebrae, lumberization, sacralization, low back pain and lumbosacral transitional variation. This review was done using standard methodology outlined in the Cochrane Handbook and reported the findings in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) statement guidelines. Results: From electronic searching, a total of 1160 studies were identified. 1060 studies remained after duplicates were omitted. Based on titles and abstracts, 900 studies were removed. Four were removed because they were ongoing studies and two were excluded due to inability to translate or obtain full text. An additional 146 were excluded based on full text records assessed for eligibility. Conclusion: Our systematic review demonstrated a difference in the dural sac (DS) termination level between groups of transitional vertebra with lumbarizaion and sacralization, which means that the position of the dural sac tip in the lumbarization group was significantly lower than in the sacralization group, and in the lumbarization group, the dural sac tip was located at the S3.

Annals of Clinical Neurophysiology, 2018

Lennox-Gastaut syndrome (LGS) is an epileptic syndrome with manifold symptomatalogy. This electro... more Lennox-Gastaut syndrome (LGS) is an epileptic syndrome with manifold symptomatalogy. This electro-clinical syndrome is composed of the triad of mental retardation, multiple seizure types and characteristic generalized slow spike-wave complexes (SSWs). 1 The seizure types include tonic, atonic, atypical absence, myoclonic, partial , and generalized convulsive seizures. 2 The syndrome may be idiopathic, cryptogenic or symptomatic. In the latter category CNS infections, tuberous sclerosis, cerebral malformations, traumatic childbirth, asphyxia of the neonate, frontal lobe pathology, and craniocerebral trauma have all been implicated. In approximately one-third of patients with LGS a history of West syndrome as a harbinger of LGS can be elicited. 3 LGS is found in 1 to 4 percent of patients with childhood encephalopathy. Prognosis is unfavourable in the majority of cases. The electroencephalogram (EEG) is essential for the diagnosis of this syndrome.

Objective: To compare standard monopolar Transurethral Resection of the Prostate (TURP) and bipol... more Objective: To compare standard monopolar Transurethral Resection of the Prostate (TURP) and bipolar transurethral resection of the prostate for management of Benign Prostatic Hyperplasia (BPH). Material and Methods: From January 2012 and February 2013, a total of 60 patients with symptomatic benign prostatic hyperplasia who are indicated for surgery were randomized into two groups. The first group was managed by monopolar TURP, and the second group was managed by bipolar TURP. Different clinical parameters, perioperative complications and success rates were compared between both groups. The follow-up was done at 1 month, 3months, 6 months and one year after surgical intervention where all patients were subjected to IPSS, uroflowmetry and postvoiding residual urine measurement. Results: Patient demographic profiles were similar in both groups. Mean resection time and mean weight of resected prostate tissue were comparable for both groups. There was a statistically significant differe...

Computability, 2020

A computable structure A has degree of categoricity d if d is exactly the degree of difficulty of... more A computable structure A has degree of categoricity d if d is exactly the degree of difficulty of computing isomorphisms between isomorphic computable copies of A. Fokina, Kalimullin, and Miller showed that every degree d.c.e. in and above 0 (n) , for any n < ω, and also the degree 0 (ω) , are degrees of categoricity. Later, Csima, Franklin, and Shore showed that every degree 0 (α) for any computable ordinal α, and every degree d.c.e. in and above 0 (α) for any successor ordinal α, is a degree of categoricity. We show that every degree c.e. in and above 0 (α) , for α a limit ordinal, is a degree of categoricity. We also show that every degree c.e. in and above 0 (ω) is the degree of categoricity of a prime model, making progress towards a question of Bazhenov and Marchuk.

Studia Scientiarum Mathematicarum Hungarica, 2019

We prove completeness, interpolation, decidability and an omitting types theorem for certain mult... more We prove completeness, interpolation, decidability and an omitting types theorem for certain multi-dimensional modal logics where the states are not abstract entities but have an inner structure. The states will be sequences. Our approach is algebraic addressing varieties generated by complex algebras of Kripke semantics for such logics. The algebras dealt with are common cylindrification free reducts of cylindric and polyadic algebras. For finite dimensions, we show that such varieties are finitely axiomatizable, have the super amalgamation property, and that the subclasses consisting of only completely representable algebras are elementary, and are also finitely axiomatizable in first order logic. Also their modal logics have an N P complete satisfiability problem. Analogous results are obtained for infinite dimensions by replacing finite axiomatizability by finite schema axiomatizability.

Mathematical Logic Quarterly, 2019

In this paper, we show that for any computable ordinal α, there exists a computable tree of rank ... more In this paper, we show that for any computable ordinal α, there exists a computable tree of rank α + 1 with strong degree of categoricity 0 (2α) if α is finite, and with strong degree of categoricity 0 (2α+1) if α is infinite. In fact, these are the greatest possible degrees of categoricity for such trees. For a computable limit ordinal α, we show that there is a computable tree of rank α with strong degree of categoricity 0 (α) (which equals 0 (2α)). It follows from our proofs that, for every computable ordinal α > 0, the isomorphism problem for trees of rank α is 0 2α-complete.

Gastrointestinal Endoscopy, 2015

Al-Azhar Medical Journal, 2022

Background: Lumbosacral transitional variations (LSTVs) are common within the spine, including sa... more Background: Lumbosacral transitional variations (LSTVs) are common within the spine, including sacralization of the lowest lumbar vertebral body and lumbarization of the uppermost sacral segment. Low back pain associated with an LSTV may arise from the level above the transition. LSTVs are common in the general population. LSTVs have been classically described as being best imaged on Ferguson radiographs. Symptoms can originate from the anomalous articulation itself, the contralateral facet joint, instability and early degeneration of the level cephalad to the transitional vertebrae, and nerve root compression from hypertrophy of the transverse process. Objective: To highlight the variations of lumbosacral anatomy. Materials and methods: We conducted a comperhensive electronic search in Pubmed, MEDLINE and Chocrane library databases, for articles that published between December 2003 and December 2018 using these keywords: lumbar and sacral vertebrae, lumberization, sacralization, low back pain and lumbosacral transitional variation. This review was done using standard methodology outlined in the Cochrane Handbook and reported the findings in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) statement guidelines. Results: From electronic searching, a total of 1160 studies were identified. 1060 studies remained after duplicates were omitted. Based on titles and abstracts, 900 studies were removed. Four were removed because they were ongoing studies and two were excluded due to inability to translate or obtain full text. An additional 146 were excluded based on full text records assessed for eligibility. Conclusion: Our systematic review demonstrated a difference in the dural sac (DS) termination level between groups of transitional vertebra with lumbarizaion and sacralization, which means that the position of the dural sac tip in the lumbarization group was significantly lower than in the sacralization group, and in the lumbarization group, the dural sac tip was located at the S3.

Annals of Clinical Neurophysiology, 2018

Lennox-Gastaut syndrome (LGS) is an epileptic syndrome with manifold symptomatalogy. This electro... more Lennox-Gastaut syndrome (LGS) is an epileptic syndrome with manifold symptomatalogy. This electro-clinical syndrome is composed of the triad of mental retardation, multiple seizure types and characteristic generalized slow spike-wave complexes (SSWs). 1 The seizure types include tonic, atonic, atypical absence, myoclonic, partial , and generalized convulsive seizures. 2 The syndrome may be idiopathic, cryptogenic or symptomatic. In the latter category CNS infections, tuberous sclerosis, cerebral malformations, traumatic childbirth, asphyxia of the neonate, frontal lobe pathology, and craniocerebral trauma have all been implicated. In approximately one-third of patients with LGS a history of West syndrome as a harbinger of LGS can be elicited. 3 LGS is found in 1 to 4 percent of patients with childhood encephalopathy. Prognosis is unfavourable in the majority of cases. The electroencephalogram (EEG) is essential for the diagnosis of this syndrome.

Objective: To compare standard monopolar Transurethral Resection of the Prostate (TURP) and bipol... more Objective: To compare standard monopolar Transurethral Resection of the Prostate (TURP) and bipolar transurethral resection of the prostate for management of Benign Prostatic Hyperplasia (BPH). Material and Methods: From January 2012 and February 2013, a total of 60 patients with symptomatic benign prostatic hyperplasia who are indicated for surgery were randomized into two groups. The first group was managed by monopolar TURP, and the second group was managed by bipolar TURP. Different clinical parameters, perioperative complications and success rates were compared between both groups. The follow-up was done at 1 month, 3months, 6 months and one year after surgical intervention where all patients were subjected to IPSS, uroflowmetry and postvoiding residual urine measurement. Results: Patient demographic profiles were similar in both groups. Mean resection time and mean weight of resected prostate tissue were comparable for both groups. There was a statistically significant differe...

Computability, 2020

A computable structure A has degree of categoricity d if d is exactly the degree of difficulty of... more A computable structure A has degree of categoricity d if d is exactly the degree of difficulty of computing isomorphisms between isomorphic computable copies of A. Fokina, Kalimullin, and Miller showed that every degree d.c.e. in and above 0 (n) , for any n < ω, and also the degree 0 (ω) , are degrees of categoricity. Later, Csima, Franklin, and Shore showed that every degree 0 (α) for any computable ordinal α, and every degree d.c.e. in and above 0 (α) for any successor ordinal α, is a degree of categoricity. We show that every degree c.e. in and above 0 (α) , for α a limit ordinal, is a degree of categoricity. We also show that every degree c.e. in and above 0 (ω) is the degree of categoricity of a prime model, making progress towards a question of Bazhenov and Marchuk.

Studia Scientiarum Mathematicarum Hungarica, 2019

We prove completeness, interpolation, decidability and an omitting types theorem for certain mult... more We prove completeness, interpolation, decidability and an omitting types theorem for certain multi-dimensional modal logics where the states are not abstract entities but have an inner structure. The states will be sequences. Our approach is algebraic addressing varieties generated by complex algebras of Kripke semantics for such logics. The algebras dealt with are common cylindrification free reducts of cylindric and polyadic algebras. For finite dimensions, we show that such varieties are finitely axiomatizable, have the super amalgamation property, and that the subclasses consisting of only completely representable algebras are elementary, and are also finitely axiomatizable in first order logic. Also their modal logics have an N P complete satisfiability problem. Analogous results are obtained for infinite dimensions by replacing finite axiomatizability by finite schema axiomatizability.

Mathematical Logic Quarterly, 2019

In this paper, we show that for any computable ordinal α, there exists a computable tree of rank ... more In this paper, we show that for any computable ordinal α, there exists a computable tree of rank α + 1 with strong degree of categoricity 0 (2α) if α is finite, and with strong degree of categoricity 0 (2α+1) if α is infinite. In fact, these are the greatest possible degrees of categoricity for such trees. For a computable limit ordinal α, we show that there is a computable tree of rank α with strong degree of categoricity 0 (α) (which equals 0 (2α)). It follows from our proofs that, for every computable ordinal α > 0, the isomorphism problem for trees of rank α is 0 2α-complete.

Gastrointestinal Endoscopy, 2015