Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 5 )

2018 ( 22 )

2017 ( 14 )

2016 ( 22 )

Custom range...

Search Results: 1 - 10 of 2394 matches for " Alireza Sina "
All listed articles are free for downloading (OA Articles)
Page 1 /2394
Display every page Item
Concealed Male Epispadias: A Rare Form of Penile Epispadias Presenting As Phimosis
Alireza Sina,Farshid Alizadeh
Urology Journal , 2011,
Comparing the Alteration of Nasal Tip Sensibility and Sensory Recovery Time following Open Rhinoplasty with and without Soft Tissue Removal
Alireza Bakhshaeekia,Sina Ghiasi-hafezi
Plastic Surgery International , 2012, DOI: 10.1155/2012/415781
Abstract: In this study we evaluated sensory alteration in nasal tip and adjacent upper columella (territory of external nasal nerve) after open rhinoplasty. Two groups were randomly selected, each containing 25 patients with thick nasal skin; sensory testing was done preoperatively in all patients; in group one, subdermal soft tissue in tip and supratip areas was removed but in group two no soft tissue removal was done; we compared sensory pressure threshold values 3 weeks and 6 months postoperatively. Results showed no statistical difference between the two groups in nasal skin sensibility at these times; also this study showed that 6 months after rhinoplasty normal sensation of nasal skin will be achieved. 1. Introduction Rhinoplasty in patients with thick nasal skin is one of the most challenging operations; regardless of its cause, the thick soft tissue coverage represents a distinct limitation in rhinoplasty because the skin will usually not redrape properly over the nasal skeletal framework [1, 2]. The operative management of such a deformity is controversial and ranges from limited procedures with no soft tissue removal [1] to scoring the dermis [3] or even tip defatting [2–5]. An anatomical and histological evaluation of the tissue specimens obtained from the tip and supratip regions showed that collagenous fibrous tissue, adipose tissue, and skeletal muscle were the predominant subdermal tissue type present; fibrous tissue, in fact, comprised the majority of the subdermal tissue so this fibromuscular tissue can be safely resected without violating the dermis thereby decreasing the soft tissue bulk of the bulbous nasal tip and not interfering with the vascular supply to the skin envelope [6]. One of the complications that commonly are seen after rhinoplasty is hypesthesia; the terminal branch of the anterior ethmoidal nerve supplies tip sensation and is usually transected during intercartilaginous incision [7]. In one study 3 weeks and one year after open rhinoplasty the sensibility of various parts of the external nasal skin was evaluated and it was shown that altered sensibility following open rhinoplasty occurs in the early postoperative period (3 weeks post operatively) in the area of skin supplied by the external nasal nerve (nasal tip and adjacent upper columella); but sensation became normal after one year; the nerve is probably injured during the subcutaneous dissection as the nerve passes between the nasal bone and the upper lateral cartilage to supply the skin [8]. According to these studies we decided to evaluate sensory alteration in nasal
Urogenital Tract Abnormalities Associated with Congenital Anorectal Malformations
Alireza Mirshemirani,Javad Ghorobi,Mohsen Roozroukh,Sina Sadeghiyan
Iranian Journal of Pediatrics , 2008,
Abstract: Objective: Genitourinary anomalies in patients with imperforate anus are a frequent source of significant morbidity. Variability of reports on the incidence of associated anomalies with imperforate anus mandates investigation on this issue. Material & Methods: The case records and imaging studies of 105 patients who underwent surgery for imperforate anus over a 10-year period are retrospectively reviewed. Voiding cystouretherography, intra venous pyelography (IVP) and ultrasound were performed in patients with intermediate or high level anorectal lesions. Findings: During 10 years, there were 48 boys (45.7%) and 57 girls (54.3%) with imperforate anus. Genitourinary anomalies were seen in 34 (48.6%) patients with intermediate or high level anorectal lesions. Eighteen of them (52.9%) were shown to have vesicouretral reflux, only 6 of them required surgical correction. Vesicoureteral reflux was the most prominent urologic anomaly; other anomalies such as ureteropelvic junction (UPJ) stenosis, hydronephrosis, hypospadias, renal agenesis and undescended testis were seen in these series. Conclusion: Patients with anorectal malformations should be evaluated for urinary tract and spinal anomalies.
A Comparison between Clinical and Pathologic Staging in Patients with Bladder Cancer
Abdolrasoul Mehrsai,Daryosh Mansoori,Mohamad Taheri Mahmodi,Alireza Sina
Urology Journal , 2004,
Abstract: Purpose: To determine the accuracy of clinical staging methods of bladder cancer and TURBT results in estimating the pathologic stage of tumor. Materials and Methods: Thirty two patients who had undergone radical cystectomy were studied in this retrospective survey. The results of bimanual examination, cystoscopy, TURBT pathology report and the tumor contour in CT scan, (size, infiltrative deepness, pelvic lymph nodes involvement and hydronephrosis) were recorded. The type of surgery and pathologic report of cystectomy sample were analyzed as well. Then the results of bimanual examination, tumor size, hydronephrosis and CT scan findings including tumor infiltrative deepness, pelvic lymph adenopathy and TURBT findings were compared to pathologic results of cystectomy sample. Results: Seven patients were females and 25 were males. Their mean age was 62 (range 36 to 80) years. Gross hematuria and irritative urinary symptoms were the most common complaints. The duration between symptom manifestation and patient’s referral was 5 days to 72 months (mean 12 months). Bimanual examination in estimating the extravesical involvement of tumor had a specificity of 82%, sensitivity of 46%, positive predictive value of 70% and negative predictive value of 63%. The size of tumor in determining extravesical involvement had a specificity of 41%, sensitivity of 93%, and positive predictive value of 58% and negative predictive value of 87%. Hydronephrosis was present in 15 patients of whom, 14 (93%) had bladder muscle involvement. CT scan specificity was 70%, and sensitivity was 46% regarding pelvic lymph adenopathy and perivesical fat involvement. In TURBT report no muscle sample was observed in 11 cases, so that the interpretations of results were impossible. The reported grade of tumor was lower than pathologic sample of cystectomy in 4 patients. Conclusion: Clinical staging in invasive bladder cancers has not high accuracy regarding the involvement of bladder surrounding fats and pelvic adenopathies. A tumor sized more than 5 cm could be sensitive in estimating extravesical involvement. Positive predictive value of hydronephrosis is considerable regarding bladder muscle involvement. Tumor understaging by TURBT is happened in high percentage of patients with invasive bladder cancer.
Buccal Mucosal Graft in Repeat Urethroplasty
Abdorasol Mehrsai,Hooman Djaladat,Alireza Sina,Sepehr Salem
Urology Journal , 2005,
Abstract: Introduction: Our aim was to evaluate the efficacy of a tubed buccal mucosal graft in repeat urethroplasty for patients with urethral stricture and failed previous operations. Materials and Methods: Ten patients (aged 12 to 47 years) with urethral stricture were entered into the study. All had a history of failed previous urethroplasties, and 5 had failed internal urethrotomies too. Repeat urethroplasties were performed by excising the fibrous tissue around the stricture; buccal mucosa was then harvested from the inner cheek, made into graft tubing, and interposed into the defect. The patients were followed at 1, 6, and 12 months. Results: The procedure was technically successful in all the patients. The mean operative time was 150 minutes. The stricture sites were in the posterior urethra in 8 and the anterior urethra in 2 patients. The mean urethral defect length was 4.9 cm. The primary etiology was pelvic fracture in 7 patients. Strictures recurred postoperatively in 3 patients, all of whom had a urethral defect longer than 5 cm, and 2 of whom had more than 1 previous failed urethroplasties (compared with 1 out of 7 in the successful cases). Urinary flow rate increased significantly (from 0 to 10.4 ± 7.33 mL/s) postoperatively (P = .018). Longer strictures produced signifcantly poorer graft urethroplasty outcomes (P = .001). Conclusion: Urethroplasty with buccal mucosal grafts is tough, resilient, easy to harvest, and it leaves no scar. It appears to be an optimal substitute for anterior and posterior urethral strictures longer than 3 cm.
How Does Service Quality Lead to Loyalty in the Hotel Industry in Iran
Alireza Tafreshi Motlagh,Ehsan Sadeh,Sina Sadeh,Hamidreza Jafari
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: This is a fact that loyal customers not only use the services of the hotel frequently but also suggest the services to other potential clients. It is obvious that loyal customers can guarantee the life of the business in the hotel industry. The theoretical background of the loyalty in the hotel industry indicates that loyalty is a consequence of hotel service quality. The main purpose of this study is to investigate how the service quality ends in loyalty in hotel industry in Iran. Review on the literature revealed that there are some factors between service quality and loyalty. In other words, high service quality can enhance the perceived value and customer satisfaction. Furthermore, this is the satisfaction that increases the loyalty of the clients. This study considers five dimensions of SERVQUAL instrument as factors of service quality in hotel industry which have been applied in similar research successfully. The hypotheses are tested with a convenience data collection approach using data from clients of four Iranian hotels. Findings indicated that some service quality dimensions significantly affect the perceived value. Furthermore, dimensions of service quality and also the perceived value directly influence satisfaction. Finally, satisfaction significantly enhances the loyalty.
Precision photonic band structure calculation of Abrikosov periodic lattice in type-II superconductors
Alireza Kokabi,Hesam Zandi,Sina Khorasani,Mehdi Fardmanesh
Physics , 2011, DOI: 10.1016/j.physc.2007.04.055
Abstract: We have performed a numerical solution for band structure of an Abrikosov vortex lattice in type-II superconductors forming a periodic array in two dimensions for applications of incorporating the photonic crystals concept into superconducting materials with possibilities for optical electronics. The implemented numerical method is based on the extensive numerical solution of the Ginzburg-Landau equation for calculating the parameters of the two-fluid model and obtaining the band structure from the permittivity, which depends on the above parameters and the frequency. This is while the characteristics of such crystals highly vary with an externally applied static normal magnetic field, leading to nonlinear behavior of the band structure, which also has nonlinear dependence on the temperature. The similar analysis for every arbitrary lattice structure is also possible to be developed by this approach as presented in this work. We also present some examples and discuss the results.
Non-Diapiric Salt Domes in the West Zanjan, Central Iran  [PDF]
Sina Alizadeh
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.72009
Abstract: The salt domes of the west Zanjan (Central Iran) are the most important structures in the study area. They have been formed by the uplifting and erosion together under low humidity and dry and warm climate condition. The salt rocks with near to 200 meters thickness are related to lower member of the Upper Red Formation (Early Miocene) that deposited in the inverted back arc basin. They have been formed in the Central Iran basin after the Arabian-Eurasian convergence. Based on filed works and preparation of geologic map, salt domes have been cropped out during regional uplifting and erosion along hinge zone of a longitudinal anticline. Also, there is no evidence for salt diapirism and so, they are different from some salt diapirs in the southwestern margin of Zanjan that is investigated by other researchers.
Metabolic syndrome is linked to a mild elevation in liver aminotransferases in diabetic patients with undetectable non-alcoholic fatty liver disease by ultrasound
Alireza Esteghamati, Arsia Jamali, Omid Khalilzadeh, Sina Noshad, Mohammad Khalili, Ali Zandieh, Afsaneh Morteza, Manouchehr Nakhjavani
Diabetology & Metabolic Syndrome , 2010, DOI: 10.1186/1758-5996-2-65
Abstract: A total of 670 diabetic patients, without known causes of hepatocellular injury, were enrolled. Patients with ultrasonographic signs of fatty liver disease were not included. Fasting blood samples were obtained and biochemical characteristics were measured. MetS was defined according to the international diabetes federation criteria.Serum ALT and AST were significantly higher in patients with MetS (p < 0.001). High waist circumference and low HDL-cholesterol were significantly associated with elevated ALT (OR = 2.56 and 2.0, respectively) and AST (OR = 2.23 and 2.21, respectively). ALT and AST were significantly associated with MetS (OR = 2.17 and 2.31, respectively). These associations remained significant after multiple adjustments for age, sex, BMI, diabetes duration, HbA1c and medications. There was a significant (p < 0.01) positive association between the number of the MetS features and the level of ALT or AST.In diabetic patients without ultrasonographic evidence of fatty liver, elevated aminotransferases are independently associated with MetS. Despite negative ultrasound results in diabetic patients with MetS, the serum level of liver aminotransferases may be elevated and should be more thoroughly monitored.Insulin insensitivity is a known cause of liver damage [1]. Elevation of circulating liver enzymes including aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP) is suggestive of hepatocellular injury [2-5]. There is increasing evidence that ALT is significantly and independently associated with type 2 diabetes mellitus [6-8], however not all of the studies support this finding [9].In recent years, nonalcoholic fatty liver disease (NAFLD), as a novel component of insulin resistance and metabolic syndrome (MetS), has drawn the attention of many researchers. NAFLD encompasses a wide spectrum of liver diseases ranging from simple benign steatosis to steatohepatitis, fibrosis, and cirrhosis [1]. This condition which
Evaluation of Babolsar Sand Behaviour by Using Static Triaxial Tests and Comparison with Case History  [PDF]
Sina Salamatpoor, Siavash Salamatpoor
Open Journal of Civil Engineering (OJCE) , 2014, DOI: 10.4236/ojce.2014.43016

An experimental study is carried out to investigate the static liquefaction of sand. For this purpose, Babolsar sand with its liquefiable parameters such as soil properties and high seismic level of underground water are investigated using static compression drained and un-drained tri-axial tests under isotropically and anisotropically conditions. Also, the data results of this sand are compared with those of the previous studies on soil case history. The study results indicate that Babolsar sand can experience the whole possible states of liquefaction soil, i.e. flow failure, limited and dilation behavior.

Page 1 /2394
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.