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Search Results: 1 - 10 of 519 matches for " Stavros Boutzouvis "
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Recurrent Urinary Tract Infections due to Asymptomatic Colonic Diverticulitis
Evangelos Falidas,Georgios Anyfantakis,Stavros Boutzouvis,Michail Kyriakopoulos,Stavros Mathioulakis,Konstantinos Vlachos,Constantinos Villias
Case Reports in Medicine , 2012, DOI: 10.1155/2012/934168
Abstract: Colovesical fistula is a common complication of diverticulitis. Pneumaturia, fecaluria, urinary tract infections, abdominal pain, and dysuria are commonly reported. The authors report a case of colovesical fistula due to asymptomatic diverticulitis, and they emphasize the importance of deeply investigate recurrent urinary tract infection without any bowel symptoms. They also briefly review the literature.
Primary retroperitoneal mucinous cystadenoma of borderline malignancy in a male patient. Case report and review of the literature
Evangelos Falidas, Stefanos Konstandoudakis, Konstantinos Vlachos, Fotios Archontovasilis, Stavros Mathioulakis, Stavros Boutzouvis, Constantinos Villias
World Journal of Surgical Oncology , 2011, DOI: 10.1186/1477-7819-9-98
Abstract: We herein report a case of a 37 year old man undergone laparotomy for a sizable retroperitoneal tumor resulting after the histological examination to a primary retroperitoneal mucinous cystadenoma of borderline malignancy.This is the third case of primary retroperitoneal mucinous cystadenoma of borderline malignancy in a male patient reported in the literature. The preoperative diagnosis is impossible. Laparotomy constitutes the only diagnostic and curative approach.The primary retroperitoneal mucinous cystadenoma is a rare tumor that affects, almost exclusively women [1]. The preoperative diagnosis is impossible in most of cases because of the rarity, the position and the texture of the tumor. We report a case of a 37 year-old male patient, with primary retroperitoneal mucinous cystadenoma of borderline malignancy; this may be the third case registered in the literature.A 37 year old man arrived at the outpatient facilities of our clinic complaining of a remittent pain at the right lateral abdomen and a palpable mass that was constantly growing up during the last twelve months. His medical history included an uneventful appendicectomy in his childhood, 27 years ago and spontaneous pneumothorax 15 years ago. By that time, he was under medication with antacids because of gastritis. He did not mention any evacuation or urination symptoms.Physical examination revealed a firm, sizeable and hard mass at the right abdomen (Figure 1), extending from the inferior ribs to the right iliac crest. Laboratory findings were within normal limits. The ultrasound (US) of the abdomen demonstrated a compact mass of uneven shape at the right abdomen, extended from the liver to the minor pelvis. Abdominal computed tomography (CT) scan, demonstrated a cystic textured lesion, extended from the lower pole of the right kidney to the right iliac fossa, with a cefalocaudal diameter of 11 cm (Figure 2). There were small diaphragms within the mass, enforced by the intravenous administration of
Pneumoperitoneum, Retropneumoperitoneum, Pneumomediastinum, and Diffuse Subcutaneous Emphysema following Diagnostic Colonoscopy
Evangelos Falidas,Georgios Anyfantakis,Konstantinos Vlachos,Christina Goudeli,Boutzouvis Stavros,Constantinos Villias
Case Reports in Surgery , 2012, DOI: 10.1155/2012/108791
Abstract: Colonoscopy is a widely used diagnostic and curative procedure. Extraperitoneal perforation with pneumoretroperitoneum, pneumomediastinum and subcutaneous emphysema combined with intraperitoneal perforation is an extremely rare complication. We report a case of a 78-year-old woman presented to the emergency department with abdominal pain and diffuse abdominal, chest, neck, and facial swelling appeared after a diagnostic colonoscopy. Diagnostic and therapeutic modalities are discussed.
Pneumoperitoneum, Retropneumoperitoneum, Pneumomediastinum, and Diffuse Subcutaneous Emphysema following Diagnostic Colonoscopy
Evangelos Falidas,Georgios Anyfantakis,Konstantinos Vlachos,Christina Goudeli,Boutzouvis Stavros,Constantinos Villias
Case Reports in Surgery , 2012, DOI: 10.1155/2012/108791
Abstract: Colonoscopy is a widely used diagnostic and curative procedure. Extraperitoneal perforation with pneumoretroperitoneum, pneumomediastinum and subcutaneous emphysema combined with intraperitoneal perforation is an extremely rare complication. We report a case of a 78-year-old woman presented to the emergency department with abdominal pain and diffuse abdominal, chest, neck, and facial swelling appeared after a diagnostic colonoscopy. Diagnostic and therapeutic modalities are discussed. 1. Introduction Colonoscopy is a widely used diagnostic and curative procedure. However, bleeding, perforation, and postpolypectomy coagulation syndrome may variably occur. The incidence of colonic perforation after colonoscopy is very rare and estimated in 0.19–0.21% [1]. Intraperitoneal perforation is common whereas extraperitoneal perforation with pneumoretroperitoneum, pneumomediastinum, and subcutaneous emphysema is extremely rare [2]. We report a case of a 78-year-old woman presented to the emergency department with abdominal pain and diffuse abdominal, chest, neck, and facial swelling appeared after diagnostic colonoscopy elsewhere performed 3 hours ago. 2. Case Presentation A 78-year-old woman arrived to the emergency department complaining of low abdominal pain and swelling of the neck, face, and left orbit (Figure 1). She mentioned a diagnostic colonoscopy performed 3 hours ago in a private medical studio in order to investigate anemia. During colonoscopy, the gastroenterologist observed diffuse subcutaneous emphysema of the neck, face, and left orbit. He interrupted the procedure and suggested immediate transfer to our institution. Upon examination, left orbit, neck, and abdomen emphysema with crepitus were noted. Abdominal pain was mainly located to the left iliac fossa. Abnormal laboratory findings included leukocytosis (14.000/mm3), anemia (Hb: 9?g/dL), and minimally elevated C-reactive protein (2.32?mg/dL). Temperature was slightly elevated (37.8°C). Vital parameters were within normal limits and no signs of respiratory distress were observed (oxygen saturation 97%). Additional information was obtained from the gastroenterologist who performed the colonoscopy. He mentioned extensive diverticular disease of the sigmoid colon and insufficient mechanical preparation of the colon with solid stools. He attributed the perforation to the effect of the air insufflations in connection with the observed diverticula. The patient underwent chest radiograph and chest and abdominal computed tomography (CT) scan. Right subdiaphragmatic air and diffuse subcutaneous
Electromagnetic Wave Propagation into Fresh Water  [PDF]
Shan Jiang, Stavros Georgakopoulos
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37042
Abstract: Wireless communications from air to fresh water are studied here. Our analysis relies on plane wave propagation mod-els. Specifically, the transmission loss and propagation loss of RF waves penetrating into fresh water are calculated for various propagation depths. Even though RF wireless communications are not well suited for seawater due to its high attenuation, our paper illustrates that RF communications from air to fresh water are possible. Finally, this work de-rives the optimum frequencies, which provide minimum attenuation and maximum propagation depth, for RF commu-nications from air to fresh water.
Simulation of Olive Kernel Gasification in a Bubbling Fluidized Bed Pilot Scale Reactor  [PDF]
Stavros Michailos, Anastasia Zabaniotou
Journal of Sustainable Bioenergy Systems (JSBS) , 2012, DOI: 10.4236/jsbs.2012.24021
Abstract:

The main aim of this study is to develop a comprehensive process model for biomass gasification in a pilot scale bubbling fluidized bed gasifier using the ASPEN PLUS simulator. A drawback in using ASPEN PLUS is the lack of a library model to simulate fluidized bed unit operation. However, it is possible for users to input their own models, using FORTRAN codes nested within the ASPEN PLUS input file, to simulate operation of a fluidized bed. The products of homogeneous reactions are defined by Gibbs equilibrium and reaction rate kinetics are used to determine the products of char gasification. Governing hydrodynamic equations for a bubbling bed and kinetic expressions for the char combustion were adopted from the literature. Different sets of gasification results for the operation conditions (temperature and air equivalence ratio (ER)) obtained from the our pilot-scale gasifier having a capacity of 1 kg/hr of olive kernel as feeding biomass, were used to demonstrate the validation of the model. The simulation results received from the application of the model were compared with the above experimental results and showed good agreement.

An Average Distance Based Self-Relocation and Self-Healing Algorithm for Mobile Sensor Networks  [PDF]
Yipeng Qu, Stavros V. Georgakopoulos
Wireless Sensor Network (WSN) , 2012, DOI: 10.4236/wsn.2012.411037
Abstract: The sensing coverage of a wireless sensor network is an important measure of the quality of service. It is desirable to develop energy efficient methods for relocating mobile sensors in order to achieve optimum sensing coverage. This paper introduces an average distance based self-relocation and self-healing algorithm for randomly deployed mobile sensor networks. No geo-location or relative location information is needed by this algorithm thereby no hardware such as GPS is required. The tradeoff is that sensors need to move longer distance in order to achieve certain coverage. Simulations are conducted in order to evaluate the proposed relocation and self-healing algorithms. An average of 94% coverage is achieved in the cases that we are examined with or without obstacles.
Sonographic evaluation of solid breast nodules
T Stavros
Breast Cancer Research , 2004, DOI: 10.1186/bcr822
Abstract: These studies show that sonography is useful in the characterization of solid breast masses. Characterizing solid breast nodules into BIRADS categories defines carcinomas that might have been missed clinically or mammographically. It identifies a BIRADS 3 group that has far less than 2% risk of being malignant and can offer the patient the option of follow-up rather than biopsy. Currently, approximately 80% of patients with BIRADS 3 solid nodules are electing to be followed rather than to undergo biopsy. It improves the accuracy of the diagnosis of malignant breast lesions. Importantly, it also accurately defines a population of benign solid breast lesions that do not require biopsy when strict sonographic criteria of benignity are present.To achieve the desired sensitivity and negative predictive values of 98% or greater the algorithm must be strictly adhered to. When the patient elects to be followed rather than undergo biopsy, follow-up should be performed in 6 months, not 1 year. The malignant lesions at most risk to be mischaracterized as BIRADS 3 are higher grade invasive ductal carcinomas that grow rapidly enough for change to be readily detected at 6 months.
Comparing the Probability of Unemployment in Southern Greece Vis-à-Vis the Entire Country
Stavros Rodokanakis
Bulletin of Geography. Socio-economic Series , 2009, DOI: 10.2478/v10089-009-0002-5
Abstract: The basic aim of this paper is to investigate the impact that educational level of individuals and participation in training programmes (apprenticeship, intra-firm training, continuing vocational training, popular training) have on their job prospects in Southern Greece (namely the regions of Southern Aegean and Crete) during the implementation of the first Community Support Framework (1989-1993). We also research the differences between the two regions under study and the entire country. We try to see whether the educational level itself and participation in training programmes increased the chances of finding a job. More specifically, we research what are the social and demographic characteristics that increase the chances of someone in the examined population finding a job, how those chances change (if they do) after the introduction of training courses and, also, whether University graduates, in contrast to most of the rest of the EU member states, face greater difficulties in finding a job than non-University graduates, as a series of studies for Greece conclude. To the author's knowledge, this is the first attempt to analyse individual anonymised records (micro-data) from the Labour Force Survey (LFS) for both employed and unemployed in those two regions at NUTS 2 level.
Stress amplification in three-dimensional narrow zones created by cavities
Syngellakis Stavros
Theoretical and Applied Mechanics , 2012, DOI: 10.2298/tam1201071s
Abstract: The paper is concerned with a particular case of stress amplification arising from the proximity of a spherical cavity to the boundary of a loaded elastic solid. The performed approximate analysis yields distributions of stresses and displacements in the narrow region formed between a spherical cavity and the faces of a thin flat layer subjected to a far field uniform radial tension. The narrow region is modelled as a circular plate of non-uniform thickness undergoing coupled membrane and flexural deformation. Series solutions are obtained for both membrane forces and bending moments leading to estimates for the stress concentration factor at minimum thickness. These predictions are found consistent with those obtained from both the exact analytical solution and finite element modelling of the problem. Cross-validated results from the two latter methods also provide trends for the stress amplification due to the narrowness of the region.
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