scispace - formally typeset
Search or ask a question
Author

Walid El Ansari

Bio: Walid El Ansari is an academic researcher from Hamad Medical Corporation. The author has contributed to research in topics: Sleeve gastrectomy & Thyroid. The author has an hindex of 8, co-authored 52 publications receiving 330 citations. Previous affiliations of Walid El Ansari include Qatar University & University of Skövde.

Papers published on a yearly basis

Papers
More filters
Journal ArticleDOI
TL;DR: This study demonstrated that a monthly high dose VD treatment for 12 months in VD deficient middle-aged men was associated with changes in levels of sexual hormones, improvement of diabetes control and metabolic syndrome components, better erectile function and changes in a prostate marker.
Abstract: Background: The associations between serum vitamin D (VD), serum testosterone (TT) and metabolic syndrome are complex and with limited published research, particularly on the effects of VD treatment on sexual hormones, erectile function and the metabolic syndrome.Objectives: This study assessed whether a monthly high dose VD treatment for 12 months in VD deficient middle-aged men was associated with: changes in levels of sexual hormones, improvement of diabetes control and metabolic syndrome components, better erectile function [International Index of Erectile Function (IIEF)-5 questionnaire]; and changes in a prostate marker.Materials and methods: Descriptive research of a prospective study, conducted between October 2014 and September 2015, 102 male patients ≥35 [(±SD: 53.2 ± 10.5), (range 35–64)] years with deficient serum VD level (<30 ng/mL) were included in the study. Participants were followed up for one year, with monitoring at 3-, 6-, 9- and 12-months. At the initial baseline visit, a com...

84 citations

Journal ArticleDOI
TL;DR: The association between female gender and chronic active gastritis; and the association between H. pylori infection and GIST are both novel findings that have not been previously reported in the published literature.
Abstract: Laparoscopic sleeve gastrectomy (LSG) is a common surgical therapeutic option for obese patients, with debate about the value of routine histopathologic examination of LSG specimens. We assessed the following: prevalence of different histopathologic changes in LSG specimens, risk factors associated with premalignant and with frequent histopathologic changes, and whether routine histopathologic examination is warranted for LSG patients with nonsignificant clinical history. Retrospective review of records of all LSG patients operated upon at Hamad General Hospital, Qatar (February 2011–July 2014, n = 1555), was conducted. Risk factors (age, BMI, gender, and Helicobacter pylori) were assessed in relation to specific abnormal histopathologic changes. Mean age and BMI of our sample were 35.5 years and 46.8, respectively. Females comprised 69.7% of the sample. Normal histopathologic specimens comprised 52% of the sample. The most common histopathologic changes were chronic inactive gastritis (33%), chronic active gastritis (6.8%), follicular gastritis (2.7%), and lymphoid aggregates (2.2%). We observed rare histopathology in 3.3% of the sample [e.g., intestinal metaplasia and gastrointestinal stromal tumor (GIST)]. Older age was associated with GIST and intestinal metaplasia (P = 0.001 for both). Females were associated with chronic active gastritis (P = 0.003). H. pylori infection was associated with follicular gastritis, lymphoid aggregates, GIST, intestinal metaplasia, and chronic active gastritis (P < 0.001 for each). Older age, H. pylori, and female gender are risk factors for several abnormal histopathologic changes. Histopathologic examination of LSG specimens might harbor significant findings; however, routine histopathologic examination of all LSG specimens, particularly in the absence of suggestive clinical symptoms, is questionable. The association between female gender and chronic active gastritis; and the association between H. pylori infection and GIST are both novel findings that have not been previously reported in the published literature.

53 citations

Journal ArticleDOI
TL;DR: A direct inverse relationship exists between seminal ORP and SDF with various levels of normal sperm morphology and using these measures in conjunction with standard semen morphology analysis could validate the result of the fertility status of patients.
Abstract: Objective To assess seminal oxidation–reduction potential (ORP) and sperm DNA fragmentation (SDF) in male infertility and their relationships with sperm morphology in fertile and infertile men. Patients and methods Prospective case-control study comparing the findings of infertile men ( n = 1168) to those of men with confirmed fertility ( n = 100) regarding demographics and semen characteristics (conventional and advanced semen tests). Spearman rank correlation assessed the correlation between ORP, SDF, and different morphological indices. Means of ORP and SDF were assessed in variable levels of normal sperm morphology amongst all participants. Results Infertile patients had a significantly lower mean sperm count (32.7 vs 58.7 × 10 6 sperm/mL), total motility (50.1% vs 60.4%), and normal morphology (5.7% vs 9.9%). Conversely, infertile patients had significantly higher mean head defects (54% vs 48%), and higher ORP and SDF values than fertile controls. ORP and SDF showed significant positive correlations and significant negative correlations with sperm head defects and normal morphology in infertile patients, respectively. ORP and SDF were significantly inversely associated with the level of normal sperm morphology. Using receiver operating characteristic curve analysis, ORP and SDF threshold values of 1.73 mV/10 6 sperm/mL and 25.5%, respectively, were associated with 76% and 56% sensitivity and 72% and 72.2% specificity, respectively, in differentiating Conclusion A direct inverse relationship exists between seminal ORP and SDF with various levels of normal sperm morphology. Using ORP and SDF measures in conjunction with standard semen morphology analysis could validate the result of the fertility status of patients.

47 citations

Journal ArticleDOI
TL;DR: Due to effectiveness and best utilization of resources, routine p-OGD screening in patients scheduled for LSG may require further justification for asymptomatic patients especially in regions with low upper GI cancers.
Abstract: Controversy exists as to whether routine preoperative esophagogastroduodenoscopy (p-OGD) in bariatric surgery should be routinely undertaken or undertaken selectively based on patients’ symptoms. As very few studies have focused on the role of p-OGD prior to the increasingly common laparoscopic sleeve gastrectomy (LSG), we assessed the role/impact of p-OGD in LSG patients. Retrospective review of records of all LSG patients operated upon at Hamad General Hospital, Qatar (2011–2014, n = 1555). All patients were screened by p-OGD. Patient characteristics were analyzed, and p-OGD findings were categorized into four groups employing Sharaf et al.’s classification (Obes Surg 14:1367–1372, 23). We assessed the impact of p-OGD findings on any change in surgical management or lack thereof. p-OGD findings indicated that 89.5% of our patients had normal or mild findings and were asymptomatic (groups 0 and 1, not necessitating any change in surgical management), and no patients had gastric cancer or varices (group 3). A total of 10.5% of our sample were categorized as group 2 patients who, according to Sharaf et al. (Obes Surg 14:1367–1372, 23), might have their surgical approach changed. All patients diagnosed preoperatively with hiatal hernia (HH) had LSG with crural repair and their symptoms resolved postoperatively. Due to effectiveness and best utilization of resources, routine p-OGD screening in patients scheduled for LSG may require further justification for asymptomatic patients especially in regions with low upper GI cancers. p-OGD findings had low impact on the management of asymptomatic patients. Crural repair plus LSG was effective for hiatal hernia.

33 citations

Journal ArticleDOI
TL;DR: LSG significantly ameliorated short- and long-term obesity-related comorbidities and body image dissatisfaction among Qatari adolescents.
Abstract: Laparoscopic sleeve gastrectomy (LSG) is widely used, and it is important to examine its physiologic and psychological efficacy among adolescents. We assessed LSG’s efficacy for weight loss, its short- and long-term effects on resolving and improving obesity-related comorbidities, and its psychological outcomes among morbidly obese adolescents. We retrospectively analyzed the medical records of 91 morbidly obese adolescents in Qatar who underwent LSG (2011–2014), with 1- and 5-year follow-ups. The mean preoperative weight and body mass index (BMI) were 132.5 ± 25.3 kg and 48 ± 7.5 kg/m2, respectively. Postoperatively, mean weight and BMI decreased to 101 ± 22 kg and 36.4 ± 7.2 kg/m2, respectively. At 1 year, the mean excess weight loss (%EWL), percent total weight loss (%TWL), and percent BMI loss (%BMIL) were 49.48 ± 25.8, 23.1 ± 11.9, and 23.16 ± 11.8%, respectively. At 5 years, %EWL, %TWL, and %BML were 78 ± 12, 35.8 ± 11.5, and 36 ± 12%, respectively. No patients developed postoperative leaks, and three patients had endoscopic dilatation due to stenosis. Overall, 64% of obstructive sleep apnea patients were cured, all prediabetic patients had total remission, and 50% of the diabetic patients were cured. The overall mean HBA1c level was 6 mmol/L, which significantly decreased to 5.1 mmol/L postoperatively (P = 0.0001). At 5 years, there was no relapse of diabetes, and 75% of the diabetic adolescents had complete remission. The only patient with hypertension showed complete resolution with laparoscopic sleeve gastrectomy. Postoperatively, overall body image satisfaction significantly improved (P = 0.0001). LSG significantly ameliorated short- and long-term obesity-related comorbidities and body image dissatisfaction among Qatari adolescents.

30 citations


Cited by
More filters
Journal Article
TL;DR: A diagnosis of gestational diabetes mellitus (GDM) (diabetes diagnosed in the second or third trimester of pregnancy that is not clearly overt diabetes) or chemical-induced diabetes (such as in the treatment of HIV/AIDS or after organ transplantation)
Abstract: 1. Type 1 diabetes (due to b-cell destruction, usually leading to absolute insulin deficiency) 2. Type 2 diabetes (due to a progressive insulin secretory defect on the background of insulin resistance) 3. Gestational diabetes mellitus (GDM) (diabetes diagnosed in the second or third trimester of pregnancy that is not clearly overt diabetes) 4. Specific types of diabetes due to other causes, e.g., monogenic diabetes syndromes (such as neonatal diabetes and maturity-onset diabetes of the young [MODY]), diseases of the exocrine pancreas (such as cystic fibrosis), and drugor chemical-induced diabetes (such as in the treatment of HIV/AIDS or after organ transplantation)

2,339 citations

Journal ArticleDOI
TL;DR: OS is an important cause of male factor infertility and its assessment provides essential information that can guide treatment strategies aimed at improving the male’s reproductive potential.
Abstract: Objective: To review and present the most distinct concepts on the association of reactive oxygen species (ROS) with male reproduction. Methods: The Preferred Reporting Items for Systematic Reviews and Meta Analyses (PRISMA) guidelines were used to search PubMed, Medline, EMBASE, and the Cochrane electronic databases for studies investigating the role of oxidative stress (OS) on sperm function. Results: The literature search yielded 1857 studies, of which 1791 articles were excluded because of irrelevance of data, non-English language, non-human nature or because they were case reports or commentaries. All included studies were reviews (46), meta-analyses (one), original research studies (18) and guideline articles (one). The studies were published between 1984 and 2018. Under normal physiological conditions, ROS are vital for sperm maturation, hyperactivation, capacitation, acrosome reaction, as well as fertilisation. However, a number of endogenous and exogenous causes may induce supra-physiological levels of ROS resulting in lipid peroxidation, sperm DNA fragmentation and apoptosis, and consequently infertility. Several laboratory testing methods can be used in infertile men to diagnose OS. Treatment usually involves antioxidant supplementation and, when possible, elimination of the causative factor. Conclusion: OS is an important cause of male factor infertility. Its assessment provides essential information that can guide treatment strategies aimed at improving the male's reproductive potential. Abbreviations: bp: base-pair; CAT: catalase; LPO: lipid peroxidation; MDA: malondialdehyde; MiOXSYS: Male Infertility Oxidative System; mtDNA: mitochondrial DNA; NAD(PH): nicotinamide adenine dinucleotide (phosphate); NO: nitric oxide; 8-OHdG: 8-hydroxy-2'-deoxyguanosine; ORP: oxidation-reduction potential; OS: oxidative stress; PKA: protein kinase A; PLA2: phospholipase A2; PRISMA: Preferred Reporting Items for Systematic Reviews and Meta-Analyses; PUFA: poly-unsaturated fatty acid; ROS: reactive oxygen species; SOD: superoxide dismutase; TAC: total antioxidant capacity; TBA: thiobarbituric acid.

242 citations