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Search Results: 1 - 10 of 529 matches for " Alexandros Kalkanis "
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A Case of Tracheal Hamartoma Resected with Loop Electrocautery
Marios Panagiotou,Alexandros Kalkanis,Napoleon Karagiannidis,Vlasis Polychronopoulos
Case Reports in Pulmonology , 2013, DOI: 10.1155/2013/568590
Abstract:
A Case of Tracheal Hamartoma Resected with Loop Electrocautery
Marios Panagiotou,Alexandros Kalkanis,Napoleon Karagiannidis,Vlasis Polychronopoulos
Case Reports in Pulmonology , 2013, DOI: 10.1155/2013/568590
Abstract: The authors report on the case of a 67-year-old man with longstanding breathlessness, which was eventually attributed to a fixed mass in the upper third of the trachea causing upper airway obstruction. The lesion was amenable to loop electrocautery resection via flexible bronchoscopy that led to prompt resolution of patient symptoms. Biopsy was consistent with tracheal hamartoma, an exceedingly rare benign tracheal tumor. All the cases of tracheal hamartomas in the literature to date, the application of electrocautery and other methods of interventional bronchoscopy for resection of selected tracheal tumors are discussed. 1. Introduction Primary tracheal tumors are rare in adults and usually malignant (80–90%). Reports regarding the histological distribution of the benign tracheal tumor are scarce, and little information is available about their natural history and behavior. The rarity of cases results in low levels of suspicion among physicians thus leading to substantial delay in correct diagnosis and treatment [1, 2]. 2. Case A 67-year-old exsmoker man presented with a 5-year history of progressive breathlessness on exertion and no other associated symptoms whatsoever. He had been empirically treated as for chronic obstructive lung disease in the past without any improvement. Flow-volume loop test revealed a variable extrathoracic airway obstruction (Figure 1). Chest X-ray was normal, but a thoracic CT scan revealed an 18 × 11 × 17?mm polypoid tumor in the upper third of the trachea with fat tissue density and no contrast uptake (Figure 2). The lung fields appeared normal. Figure 1: Flow-volume loop before (a) and after (b) the resection of the tracheal tumor. Figure 2: From left to right: axial, coronal, and sagittal CT views of the tumor located in the upper third of the trachea. The patient underwent flexible bronchoscopy under local anesthesia following an oral approach which demonstrated a white pendulated tumor covered with smooth mucosa attached with a narrow base of 2-3?mm to the right antero-lateral tracheal wall between the second and the third cartilaginous rings form the vocal cords. The lesion was obliterating the tracheal lumen by 80%. An electrocautery loop was passed through the bronchoscope, positioned around the base of the tumor, and tightened to gather the tissue at the point of its attachment to the tracheal wall. The tumor was completely resected by delivering electrocautery. Following resection, the tumor remained attached to the electrocautery loop, and it was removed with the simultaneous withdrawal of the bronchoscope, the
Neutrophil gelatinase-associated lipocalin in dehydrated patients: a preliminary report
Constantine N Antonopoulos, Alexandros Kalkanis, Georgios Georgakopoulos, Theodoros N Sergentanis, Dimitrios N Rigopoulos
BMC Research Notes , 2011, DOI: 10.1186/1756-0500-4-435
Abstract: A total of twelve patients presented with symptoms of mild dehydration defined by history of diarrheas or vomiting and orthostatic (postural) hypotension and an age and sex matched group of twelve control patients were included. The two groups of patients did not seem to differ in basic clinical and laboratory parameters. Serum Ngal was higher in dehydrated patients when compared to control group (Ngal = 129.4 ± 25.7 ng/mL vs 60.6 ± 0.4 ng/mL, p = 0.02). Ngal was not correlated with age, hemoglobin, white blood cell count, red blood cell count, urea or creatinine.The presence of elevated Ngal levels in dehydrated patients may suggest its role as a very sensitive biomarker in even minimal and "silent" prerenal kidney dysfunctionRenal impairment may be the result of a variety of renal or systemic diseases and may lead to renal failure [1]. Although the gold standard of renal failure's diagnosis is serial measurements of serum creatinine (Cr) [2,3], this biomarker is of little clinical importance in very early stages of renal disease. A novel biomarker, neutrophil gelatinase-asssociated lipocalin (Ngal), has been promising in evidencing renal impairment, even when changes in serum Cr level are undetectable [1].In order to explore the possible role of Ngal in subclinical renal dysfunction, such as renal hypoperfusion, we prospectively evaluated twelve patients aged>18 years with medical history suggesting mild dehydration, accompanied by orthostatic hypotension. A group of twelve apparently healthy individuals with no history of dehydration and no evidence of orthostatic hypotension were treated as controls. Ethical approval was obtained by the Ethics Committee of the "401 General Army Hospital" in Athens, Greece and all patients gave informed consent.Dehydrated and controls were similar in age and gender (75% males in each group) and in terms of basic laboratory tests (Hemoglobin; Hb, White blood cells; Wbc, Red blood cells; Rbc, Urea; Ur and Cr). Although no laborator
The Nature of Economic Turbulence: The Power Destructing Economies, with Application to Shipping  [PDF]
Alexandros M. Goulielmos, Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.95066
Abstract: Studying the history of “economic turbulence”, we ended up with the certainty that the statistical methods used so far, by economists, are unsuitable to model it. We have mainly the methods of Normal distribution and Random Walk in mind. Moreover, the picture of reality we get from time series depends on the time-frame of the data used… Different time-frame data, different reality… In addition, econometricians provided a whole family of econometric models to approach reality, starting in early 1980s, with “autoregressive models—AR” combined or not with MA (moving averages). But even its 1986 flagship, the GARCH, with its many variations, cannot cope with a number of characteristics, one of which is leptokurtosis (small alpha, higher peaks and long tails), though some argue that it can cater for outliers. Economic turbulence, low or high—despite its characterization by Science as rare—became frequent since 1987 (Black Monday)... In late 1990s e.g. the global financial system underwent 6 crises—which have been called “near turbulences”—over a number of countries, including Russia in 1998. The next turbulence will not be one generation apart—we reckon. This paper is an attempt to invite writers to write a “theory of economic turbulence”. Turbulence is a nightmare, which wakes people up suddenly, and unexpectedly, but it is something people wish to forget… till it strikes again: turbulence stroke in 1929 on (Black) Tuesday, then in 1987 on (Black) Monday and in end-2008, the Great Recession—on 29th September. In Black Monday stock markets around the world crashed losing a huge value in a matter of very short time (Hong Kong, Europe, and USA). The Dow fell ~23%. At that time OPEC collapsed in 1986 and the price of oil doubled… The dry cargo shipping sector entered a turbulent situation since 1989, which has been deteriorated since 2015 reaching finally an alpha equal to ~1.43 < 1.70 by 2035…
The Impact of an Environmental Educational Program of a School Garden on Pupils with Intellectual Disabilities—A Comparative Approach  [PDF]
Alexandros Stavrianos, Alexia Spanoudaki
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.34005
Abstract: The following research describes an attempt to combine environmental education through outdoor activities in Special Education. It examines the use of a school garden as a learning environment in Special Education by looking at the stances and opinions of 10 pupils, diagnosed with mild to moderate intellectual disability, towards Environmental Education and prognoses barriers that may occur in the learning process. Specifically, the study focuses on the skills and subject knowledge those students have cultivated through a project called “School Garden”, highlighting the ideas pupils have, regarding the position of environmental education in their school curriculum. Using descriptive statistical analysis to compare the two groups of pupils, this research suggests the further practice of Environmental Education in Special Education. The research took place in two Special Education Primary Schools in Greece, while the data were collected using semi-structured interviews. The main conclusions of the research were that students who participated in their school’s environmental educational program seem to be more familiarized with a range of concepts related to the environment and possess skills linked directly to Environmental Education in relation to their peers that did not engage in the project, while pupils who participated in the “School Garden”, unlike their peers, perceived outdoor activities of their school as part of the learning process, in formal education. This study proposes further research to take place in the area of Environmental Education and Special Education.
The “Modern Greek Maritime Policy”, 1953-2018: A Critical Review of Its Legal, Economic and Institutional Framework  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.97078
Abstract: We showed analytically the legal framework, which Greek flag administration established since 01/01/1953 with the long celebrated law of 2687/1953 for ships greater than 1500 GRT. All Greeks believe that this institutional framework contributed a lot to the expansion of Greek-flagged shipping. We also presented the tonnage tax payable by a Greek-flagged ship, with suggestions to modify it in a more proper manner. We dissolved the myth that Greek flag is a quasi or a flag-of-convenience, where ships do not pay taxes. We have stressed a number of facts: 1) the role that a Government plays vis-à-vis national shipping; 2) the freedom of actions which shipping needs; 3) the best legal framework required by shipping: in having permanency, being expandable as time goes by, protected by country’s constitution, modified to provide more favorable terms and all these are legislated by 2 ministers outside parliament in a fast way to be ahead of any shipping crisis like that in 1981-1987. Law 2687 and “the ship registration approval action” are the products of a long traumatic experience—except in 1946—that Greek-flagged shipping had since 1830 from various governments—including that of El. Venizelos—and from 2 world wars.
Self-Reinforcing Mechanisms in Economics: with Two Case-Studies from Shipping Industry  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.97085
Abstract: “Returns to scale”, as a methodology, goes back to Adam Smith (1776). Economists after Marshall (1842-1924), with certain exceptions, confined their interests exclusively to “Constant returns to scale”. As a return they secured for their analysis a single equilibrium point with convenient convex curves. Early economists were sure that “resource-based” economic sectors like “Agriculture”, “Bulk goods production” and “Mining” exhibited “diminishing returns to scale”, a belief valid till this day. However, at least 9 important “knowledge-based” sectors exhibited increasing returns. More important is that increasing returns provides also no obstacle to growth of a firm, and of an industry…till it becomes a monopoly... We presented arguments against and in favor of this last theory drawn from Shipping and Marketing. Moreover, we examined the existence of increasing returns in relation to shipping industry and especially with 2 case-studies dealing with: 1) the exceptional economies of scale concerning “Vale S.A.” and its giant ships “Valemax” of 400,000 dwt, double in size of existing ships (i.e. the Capes of about 200,000 dwt) and 2) the case of shipowners locked-in within the extremely high chartering markets during 2003-2008. The first was also examined in relation to the impact of “chance or small historical events”. Traditional economists indeed did not have the mathematical tools to deal with “increasing returns” and “path dependence” till 1983, when “Arthur et al.” discovered the “Urn schemes of the Polya kind”. This method succeeded in combining probabilities or random facts with deterministic or chaos motions! This had a great impact on methodology, which, prior to that, dealt with either random or deterministic models in a water-proof separate manner. The aim of this paper was to mark out the importance of increasing returns, which has important implications in economic development policies, and comes from
The Economics of Wealth According to Economic and Religious Principles  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.98093
Abstract: We presented the issue of personal wealth drawing mainly from the economics of Keynes, and from New Testament, introducing the fact that a human being has two lifetimes. The second lasts an infinitum time, based on the assumption that soul is immortal. We showed also that “disutility of labor” and unhappiness introduced first by God; economists then tried to balance it with utility of consumption (in 1854) focusing on human body, and ignoring human soul, mind and their needs. We also presented as to how a World War can boost growth of GDP. When Ricardo raised the issue of how GDP is divided among factors of production, and that only labor creates value along with Marx, society divided, while religion wanted it united and peaceful. Protestantism made work as god. Concluding we said that an “uncontrolled personal wealth” is detrimental from both economic and religious point of view. Dealing with matters of Christian Orthodoxy for years, made us proficient. We believe, or rather audacious, to underline certain fundamental principles of it.
The Unresolved Issues in Maritime Economics  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.910107
Abstract: Maritime Economics includes Port, Shipbuilding and Shipping economics with two important, but unresolved so far, issues/questions: 1) Is the vessel the firm (?) and 2) Is the tanker market perfectly competitive? These issues were thoroughly analyzed. There is also the opinion of Professor Button K (2005), about maritime economists, which we considered it necessary to evaluate. A review of Prof. Goss’ paper on “early history of maritime economics” (2002), as well his entire contribution, is also carried-out as an obituary1 to his recent death. Reference is also made to Prof. Talley’s research (2013) on “maritime economics” (2001-2012) in order to show the progress of this relatively new science of applied economics. Finally, the state of the tanker market, after 1987, and till 2010, is presented to connect past with present.
Psychological Economics: The Case-Studies of Eurozone, Global Economic Crisis and Greece  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.911113
Abstract:

We showed what Economics owes to Psychology in Microeconomics with utility and in Macroeconomics with the 4 propensities to consume, to save, to invest and to hold cash. Psychology is a science in-the-making, but par excellence essential in Keynes’ model. Keynes’ 3 independent variablesconsumption, rate of interest and marginal efficiency of capital, are presented (in the appendix). We also derived a “demand curve” for goods, using “Pareto’s power law”. We showed (partly) Keynes’ microeconomics, something which many argued Keynes lacked. We took—in additionthe opportunity to use Hicks’ IS/LM curves. Moreover, we used the “Swan-Solow” diagram. These 3 diagrams helped us to present the situation in Eurozone, in our country Greece, and from the impact of the “Global financial crisis” (GFC) since end 2008, drawing on Temin & Vines [3] and … of course on Keynes [1]. We saw that emphasis in the quality of goods, which we consume, and in the proper attention to the environment, we live, was largely absent! Economists escaped from their half responsibilities by an alibi saying that: our science is “about what is”

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