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Search Results: 1 - 10 of 1347 matches for " Nikolaos Fotos "
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Therapeutic approach of chronic Hepatitis C
Nikolaos V. Fotos
To Vima tou Asklipiou , 2007,
Abstract: Chronic infection from the hepatitis C virus (HCV) is one of the most common infectious diseases worldwide. It is estimated that more than 170 million people worldwide are infected by HCV. HCV is responsible for the 70% of cases of chronic hepatitis, the 60% of cases of hepatocellular cancer and the 30% of liver transplantations. Therapy of chronic infection from the HCV aims to the: a) eradication of the virus from liver and blood and sustenance of undetectable serum HCV-RNA after the end of the treatment and b) stabilization or improvement of liver histological status. In 80' physicians treated chronic hepatitis C by using interferon alpha (IFN-α), whereas few years later they added ribavirin to the treatment. The combination therapy of IFN-α and ribavirin had had better results, but many patients left untreated. In 90' IFN-α was replaced by pegylated interferon alpha (PEG-IFN-α), with or without the use of ribavirin. In this study the following questions are answered: a) which patients should be treated? b) what are the appropriate clinical and laboratory tests before treatment? c) which is the most effective therapeutic scheme and which is its duration? and d) which is the appropriate surveillance of the patients, especially after the end of the treatment? Additionally, there are mentioned the most common adverse effects of interferon and ribavirin treatment, which are in many cases the cause of altering the treatment.
Celiac Disease
Nikolaos Fotos,Hero Brokalaki
To Vima tou Asklipiou , 2008,
Abstract: Celiac disease is a small intestine disease caused by the immunological response to gluten, a component of wheat, rye and barley. The worldwide prevalence of celiac disease ranges between 0.2% and 2.2 %. The clinical features of celiac disease includes diarrhea, steatorrhea, flatulence, abdominal pain and weight loss. The asymptomatic type of celiac disease is characterized by soft or normally shaped stool, weakness, lassitude and moderate weight loss. In children, celiac disease usually arises between the first and the third year of age, with diarrhea, flatulence and low weight. The malabsorption in small intestine causes many extaintestinal manifestations, such us anemia, bone abnormalities, hemorrhage and neuropathy. Celiac disease is diagnosed by histological examination of tissue samples taken by duodenum due gastroscopy and by the detection of certain antibodies in blood (anti-GL-IgG, anti-GL-IgA, ΕΜΑ-IgA και anti-tTg-IgA). The only therapeutic approach to celiac disease is a gluten-free diet and, if it is necessary, the administration of iron, folic acid, calcium and vitamins (K, B12). The prognosis of celiac disease is excellent, if there is an early diagnosis and the patient keeps for life a gluten free diet.
Effect of anxiety and depression in the onset and progression of heart failure
Zoi Agelopoulou,Nikolaos V. Fotos,Hero Brokalaki
To Vima tou Asklipiou , 2012,
Abstract: Introduction: Clinical experience suggests that depression and anxiety are connected with the onset and progress of heart failure (HF). Aim: The aim of the present study was to investigate the effect of stress and depression in the onset and progress of HF. Material and method: A literature review was conducted in order to identify articles relevant to the stress and depression in patients with HF, published in the English language, during the last decade (1-1-2002 to 31-5-2011), using different databases such as PubMed, CINAHL και Cochrane. The key words were: "heart failure", "anxiety", "depression", "quality of life", "psychiatric symptoms", "psychological support". Results: The literature review showed that psychosocial factors, such as stress and depression, both have a significant role in the onset of diseases that cause HF and in the progression of HF. Also, it is shown that early and effective treatment of psychosocial factors can lead to a reduction in the frequency and severity of HF. In this effort nurses could help by applying new methods and techniques. Conclusions: The correlation of anxiety and depression with the onset and progress of HF could trigger nurses to adopt new therapeutic interventions, which will help them treat patients with HF in a better and more holistic way.
Orofaciodigital (OFD) syndromes: Report of a case with OFDS type I.
Manolis I. Papagrigorakis,Spyros Fotos,Geogrios Damanakis,Nikolaos Lygidakis
Hellenic Orthodontic Review , 2010,
Abstract: Ιn this paper α literature review is performed regarding the orofaciodigital syndrome (OFDS) and a characteristic case of OFDS type I is presented. OFDS comprises a heterogenous group of pathologic conditions, consisting of 11 types with different phenotypes (I-XI). OFDS type I diagnosis is set at birth from the characteristic oral, digital and facial anomalies. It is x-linked, pertains to female subjects, and is attributed to a gene mutation located at Xp22.3-22.2 position. Oral anomalies include lacerated tongue, multiple frenula, tongue harmatomes or lipomas, soft palate and/or hard palate clefts, congenitally missing teeth and other dental anomalies. Facial anomalies include hypertelorism, hypoplasia of the major pterygoid nasal cartilage, pseudo-cleft at the middle portion of the upper lip and micrognathia. Digital anomalies include brachydactyly, syndactyly, clinodactyly of the fifth finger, doubling of the big toe and polydactyly of the hands. Moreover, central nervous system anomalies accompanied with minor mental retardation and polycystic kidney disease may be present. The main treatment focus of patients with OFDS type I is surgery of the clefts, of the frenula, of the lingual anomalies, of the digital anomalies and orthodontic treatment of the malocclusion. Furthermore, special care is required for proper kidney function and rehabilitation of speech disorders.
A Computational Comparison of Basis Updating Schemes for the Simplex Algorithm on a CPU-GPU System  [PDF]
Nikolaos Ploskas, Nikolaos Samaras
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.36048

The computation of the basis inverse is the most time-consuming step in simplex type algorithms. This inverse does not have to be computed from scratch at any iteration, but updating schemes can be applied to accelerate this calculation. In this paper, we perform a computational comparison in which the basis inverse is computed with five different updating schemes. Then, we propose a parallel implementation of two updating schemes on a CPU-GPU System using MATLAB and CUDA environment. Finally, a computational study on randomly generated full dense linear programs is preented to establish the practical value of GPU-based implementation.

Perturbative renormalization of GPDs to O(a^2), for various fermion/gluon actions
Martha Constantinou,Haralambos Panagopoulos,Fotos Stylianou
Physics , 2010,
Abstract: We present a 1-loop perturbative calculation of the fermion propagator, up to O(a^2) (a: lattice spacing). The fermions are described by Wilson, clover and twisted-mass actions; for gluons we use Symanzik improved actions (Plaquette, Tree-level Symanzik, Iwasaki, TILW, DBW2). Our results are given in a general covariant gauge, and their dependence on the coupling constant, the external momentum, the masses and the clover parameter is shown explicitly. We also study the O(a^2) corrections to matrix elements of unpolarized/polarized fermion bilinear operators, which include up to one derivative. These corrections are essential ingredients for improving, to O(a^2), the renormalization constants of the operators under study. In addition, they can be used to minimize lattice artifacts in non-perturbative studies.
O(a^2) corrections to the propagator and bilinears of Wilson / clover fermions
Martha Constantinou,Haralambos Panagopoulos,Fotos Stylianou
Physics , 2008,
Abstract: We present the corrections to the fermion propagator, to second order in the lattice spacing, O(a^2), in 1-loop perturbation theory. The fermions are described by the clover action and for the gluons we use a 3-parameter family of Symanzik improved actions. Our calculation has been carried out in a general covariant gauge. The results are provided as a polynomial of the clover parameter, and are tabulated for 10 popular sets of the Symanzik coefficients (Plaquette, Tree-level Symanzik, Iwasaki, TILW and DBW2 action). We also study the O(a^2) corrections to matrix elements of fermion bilinear operators that have the form $\bar\Psi\Gamma\Psi$, where $\Gamma$ denotes all possible distinct products of Dirac matrices. These correction terms are essential ingredients for improving, to O(a^2), the matrix elements of the fermion operators. Our results are applicable also to the case of twisted mass fermions. A longer write-up of this work, including non-perturbative results, is in preparation together with V. Gimenez, V. Lubicz and D. Palao.
Letter to the Editor: Postoperative Rhinorrhea without Intraoperative Cerebrospinal Fluid Leak after Endoscopic Transnasal Transphenoidal Surgery for Pituitary Macroadenomas  [PDF]
Nikolaos Gkekas, Panagiotis Primikiris, Nikolaos Georgakoulias
Open Journal of Modern Neurosurgery (OJMN) , 2014, DOI: 10.4236/ojmn.2014.41008
Abstract: Postoperative Rhinorrhea without Intraoperative Cerebrospinal Fluid Leak after Endoscopic Transnasal Transphenoidal Surgery for Pituitary Macroadenomas
Depicting Determinants and Effects of Intimacy and Verbal Aggressiveness Target through Social Network Analysis  [PDF]
Nikolaos Hasanagas, Alexandra Bekiari
Sociology Mind (SM) , 2015, DOI: 10.4236/sm.2015.53015
Abstract: Aim of this research is to suggest determinants and effects of intimacy (including also its extreme forms such erotic relation or life-partnership), measured in term of its effect, attraction, as well as to analyze relations between attraction and verbal aggressiveness. Complete social network analysis has been conducted in a class of students of Physical Education Department, University of Thessaly (N = 53). The data were collected with standardized questionnaires. Network analysis software (Visone) as well as cross-sectional analysis (SPSS) has been implemented. The results are: Attractiveness is gender-specific, as it is connected with male students. Younger students tend to be more attractive in physical appearance and dressing. The mother’s pedagogic influence becomes evident on the attractiveness of someone for life-partnership. The academic conformity is not conducive to the development of pleasant discussions. Spending money for entertainment and impressing try to outweigh attractive physical appearance. Being aware of preference for durable erotic relation strengthens self-confidence. A companionship seems to be of socio-intellectual or of emotional-sexual nature. Attractiveness seems to lead to verbal aggression. It seems also to reduce the tendency to escape to imaginary sceneries. Physical dimension appears to be stronger than mental parameters for maintaining a durable erotic relation. The desire for life-partnership without children appears to be favored by mental elements. Verbal-aggressors search for targets without meticulously examining weaknesses and strengths on each person. Distinct types of attractiveness are also detected, corresponding to the following patterns: general sociability (“friend”) which is also connected with mild (narcissistic) exploitation, erotic relation (“erotic”) which is an autonomous value system based on superficial criteria related to appearance, focusing on communication (“distant communicable”), being an idol (“fully narcissistically exploitable”) without any reality basis, and life-long occupation of a person (“life-long exploitable”).
Suggesting Indicators of Superficiality and Purity in Verbal Aggressiveness: An Application in Adult Education Class Networks of Prison Inmates  [PDF]
Alexandra Bekiari, Nikolaos Hasanagas
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43035
Abstract: Aim of this research is to suggest indicators, based on social network analysis, that distinguish superficial, idiosyncratic and strategic verbal aggressiveness. Two classes of an adult education school (at secondary level) in a prison have been selected as network samples (A class = 23 and B class = 12 prisoners). Complete network analysis has been applied, using standardized questionnaires. The network variables have further processed through Pearson correlation. Indicators of superficial and pure roles, particularly incremental and proportional behavior, have been applied in two forms of verbal aggressiveness (criticism and threatening). The superficial behavior (SB: outdegree of verbal aggressiveness) seems to be a quite sensitive indicator, as it presents correlations with various other relational forms of familiarity, aggressiveness and appreciation/socialization. The incremental behavior (IB: difference of received from outgoing actions) is also a sensitive indicator, revealing, however, different results. Pure aggressiveness (in terms of difference) seems to be related with quite different causes and/or occasions than the superficial aggressiveness. Incremental behavior is likely to be at first place driven by the idiosyncrasy rather than by exogenous factors and seems to constitute a completely different notion than the SB. The proportional behavior (PB: ration of outgoing to the received actions) of aggression is a quite insensitive indicator, as it depends only on a few behavioral variables. It seems to reveal a rational strategy of adaptability. Thus, it characteristically differs from the indicators of superficiality (expressing reciprocity patterns) and of the incremental aggressiveness (expressing individualism).
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