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Search Results: 1 - 10 of 2059 matches for " Ioannis Mamaloudis "
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Adrenocortical Carcinoma Presenting with Signs of Acute Abdomen
Dimitrios Symeonidis,Ioannis Chatzinikolaou,Georgios Koukoulis,Ioannis Mamaloudis
Case Reports in Surgery , 2013, DOI: 10.1155/2013/132726
Abstract:
Impact of antiplatelet treatment on colorectal cancer staging characteristics
Dimitrios Symeonidis,Georgios Koukoulis,Grigorios Christodoulidis,Ioannis Mamaloudis
World Journal of Gastrointestinal Endoscopy , 2012, DOI: 10.4253/wjge.v4.i9.409
Abstract: AIM: To evaluate whether antiplatelet medication leads to an earlier stage colorectal cancer (CRC) diagnosis. METHODS: From January 2002 until March 2010, patients that presented to our institution with the initial diagnosis of CRC and were submitted to an open curative CRC resection or a palliative procedure were retrospectively reviewed. Exclusion criteria were the use of antithrombotic medication, i.e., coumarins, and appendiceal malignancies. Data acquired from medical files included age, gender, past medical history, antithrombotic treatment received prior to endoscopic diagnosis, preoperative imaging staging, location of the tumor, surgical and final histopathological report. Patients that did not receive any antithrombotic medication prior to the endoscopic diagnosis comprised the control group of the study, while patients that were on antiplatelet medication comprised the antiplatelet group. Primary end point was a comparison of CRC stage in the two groups of the study. CRC presenting symptoms and the incidence of each cancer stage in the two groups were also evaluated. RESULTS: A total of 387 patients with the diagnosis of CRC were submitted to our department for further surgical treatment. Ninety-eight patients (25.32%), with a median age of 71 years (range 52-91 years), were included in the antiplatelet group, while 289 (74.67%) patients, with a median age of 67 years (range 41-90 years), were not in any thrombosis prophylaxis medication (control group). Thirty-one patients were treated with some kind of palliative procedure, either endoscopic, such as endoscopic stent placement, or surgical, such as de-compressive colostomy or deviation. Coronary disease (77.55% - 76 patients), stroke recurrence prevention (14.28% - 14 patients) and peripheral arterial disease (8.16% - 8 patients) were the indications for the administration of antiplatelet treatment (aspirin, clopidogrel, ticlopidine or dipyridamole) in the antiplatelet group. All patients on aspirin treatment received a dosage of 100 mg/d, while the minimum prophylactic dosages were also used for the rest of the antiplatelet drugs. Investigation of an iron deficiency anemia (147 patients), per rectum blood loss (84 patients), bowel obstruction and/or perforation (81 patients), bowel habits alterations (32 patients), non-specific symptoms, such as weight loss, intermittent abdominal pain and fatigue, (22 patients) or population screening (21 patients) were the indications for the endoscopic investigation in both groups. Bleeding, either chronic presenting as anemia or acute was significantly
Ingested Fish Bone: An Unusual Mechanism of Duodenal Perforation and Pancreatic Trauma
Dimitrios Symeonidis,Georgios Koukoulis,Ioannis Baloyiannis,Apostolos Rizos,Ioannis Mamaloudis,Konstantinos Tepetes
Case Reports in Gastrointestinal Medicine , 2012, DOI: 10.1155/2012/308510
Abstract: Ingestion of gastrointestinal foreign bodies represents a challenging clinical scenario. Increased morbidity is the price for the delayed diagnosis of complications and timely treatment. We present a case of 57-year-old female patient which was admitted in the emergency room department complaining of a mid-epigastric pain over the last twenty-four hours. Based on the patient's history, physical examination and elevated serum amylase levels, a false diagnosis of pancreatitis, was initially adopted. However, a CT scan confirmed the presence of a radiopaque foreign body in the pancreatic head and the presence of air bubbles outside the intestinal lumen. The patient was unaware of the ingestion of the foreign body. At laparotomy, after an oblique duodenotomy, a fish bone pinned in the pancreatic head after the penetration of the medial aspect of the second portion of the duodenal wall was identified and successfully removed. The patient had an uneventful postoperative recovery. Wide variation in clinical presentation characterizes the complicated fish bone ingestions. The strategically located site of penetration in the visceral wall is responsible for the often extraordinary gastrointestinal tract injury patterns. Increased level of suspicion is of paramount importance for the timely diagnosis and treatment.
Spontaneous expulsion from rectum: a rare presentation of intestinal lipomas
Vasileios K Kouritas, Ioannis Baloyiannis, Georgios Koukoulis, Ioannis Mamaloudis, Dimitris Zacharoulis, Matheos Efthimiou
World Journal of Emergency Surgery , 2011, DOI: 10.1186/1749-7922-6-19
Abstract: Intestinal lipomas were firstly described by Bauer in 1757 [1] with 275 cases reported in the literature till 2001 [2]. They comprise a 5% of all gastrointestinal tract tumors [3,4]. Lipomas are considered to be the second most frequent benign lesions of the intestine appearing relatively rarely in clinical practice after adenomatous polyps [3-5]. Their malignant potential is considered to be minimal [3,4].They are non-epithelial, mostly solitary, sessile or pedunculated lesions originating from mature lipocyte cells [6]. They can also appear in multiple locations in a 10-20% of cases especially if the lipoma is located in the ceacum [7,8]. They usually are small lesions, with a diameter less than 2 cm, but can reach a diameter of 30 cm [9,10] with most lesions being 4 cm at the time of detection [11]. They grow in the submucosal plane although occasionally they may extend into the muscularis propria, whereas in a 10% of cases they are subserosal [12]. They are covered either by an atrophic mucosa with congestion and inflammatory foci or are ulcerated with erosion of the overlying mucosa at the dome of the lipoma [13].Their site of appearance starts from the hypopharynx till the rectum, with the ascending colon and the distal ileum alongside with the ileo-cecal valve being the most common sites of appearance [3,4,6,14-16]. The transverse, descending, sigmoid colon and rectum are other sites in order of greater appearance [17].Lipomas present mainly on the right side of the abdomen with females in their 5th decade of age being favored [11,18]. In males, the left abdomen is more often manifested [19].Lipomas are long standing and usually run asymptomatic and unnoticed whatsoever for many years [6]. They become symptomatic in less than 30% of cases [4-6] and this usually occurs when they increase more than 2 or 3 cm in diameter [7,11]. It is reported that a 75% of patients with intestinal lipomas larger than 4 cm had symptoms [20]. In another study, 46% of the patients
Ingested Fish Bone: An Unusual Mechanism of Duodenal Perforation and Pancreatic Trauma
Dimitrios Symeonidis,Georgios Koukoulis,Ioannis Baloyiannis,Apostolos Rizos,Ioannis Mamaloudis,Konstantinos Tepetes
Case Reports in Gastrointestinal Medicine , 2012, DOI: 10.1155/2012/308510
Abstract: Ingestion of gastrointestinal foreign bodies represents a challenging clinical scenario. Increased morbidity is the price for the delayed diagnosis of complications and timely treatment. We present a case of 57-year-old female patient which was admitted in the emergency room department complaining of a mid-epigastric pain over the last twenty-four hours. Based on the patient's history, physical examination and elevated serum amylase levels, a false diagnosis of pancreatitis, was initially adopted. However, a CT scan confirmed the presence of a radiopaque foreign body in the pancreatic head and the presence of air bubbles outside the intestinal lumen. The patient was unaware of the ingestion of the foreign body. At laparotomy, after an oblique duodenotomy, a fish bone pinned in the pancreatic head after the penetration of the medial aspect of the second portion of the duodenal wall was identified and successfully removed. The patient had an uneventful postoperative recovery. Wide variation in clinical presentation characterizes the complicated fish bone ingestions. The strategically located site of penetration in the visceral wall is responsible for the often extraordinary gastrointestinal tract injury patterns. Increased level of suspicion is of paramount importance for the timely diagnosis and treatment. 1. Introduction Foreign body ingestion is a common phenomenon especially in the pediatric population. The vast majority of these pediatric ingestions are accidental. Intentional ingestion of foreign bodies especially occurs in individuals beyond the age of adolescence [1, 2]. While coins, toy’s parts and batteries are the most commonly encountered objects in children, meat and fish bones represent the most often accidentally ingested foreign bodies in adults [2]. The size, shape, and the material of the foreign body as well as the patient’s age determine the natural history of this condition. Sharp foreign bodies increase the risk for complications and the possibility of successful observational management declines. The incidence of foreign bodies requiring operative removal varies greatly in the literature. Figures ranging from 1% to 14% have been reported [3]. A conservative approach to foreign body ingestions is generally justified, although early endoscopic removal of objects within the stomach is recommended. The success of nonoperative management depends on the absence of symptoms in a patient with a clear history [4]. On the other hand, sharp object ingestions warrant a higher index of suspicion as they are associated with a significantly higher
Diaphragmatic rupture causing repeated vomiting in a combined abdominal and head injury patient: a case report and review of the literature
Dimitrios Symeonidis, Michail Spyridakis, Georgios Koukoulis, Grigorios Christodoulidis, Ioannis Mamaloudis, Konstantinos Tepetes
World Journal of Emergency Surgery , 2012, DOI: 10.1186/1749-7922-7-20
Abstract: We present a challenging case of a young male with combined abdominal and head trauma. Repeated episodes of vomiting dominated on clinical presentation that in the presence of a deep scalp laceration and facial bruising shifted differential diagnosis towards a traumatic brain injury. However, a computed tomography scan of the brain ruled out any intracranial pathology. Finally, a more meticulous investigation with additional imaging studies confirmed the presence of diaphragmatic rupture that justified the clinical symptoms.The combination of diaphragmatic rupture with head injury creates a challenging trauma scenario. Increased level of suspicion is essential in order to diagnose timely diaphragmatic rupture in multiple trauma patients.
Risk Management in On-Line Banking  [PDF]
Ioannis V. Koskosas
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.34013
Abstract: In the context of goal setting, the more difficult the goal, given feedback on performance, the more focused is individuals’ attention and persistence to accomplish the goal and in turn, their performance is also improved. Similarly, when the goal is multi-complex and performance time constraint, the deployment of specific strategies maybe the best approach developed. In effect of the above, this investigation takes a socio-psychological and organizational perspective in setting information systems (IS) security goals. In doing so, three important issues of goal setting are identified, these are: trust, culture and risk communication. Since system security breaches are still on the rise, the performance of managing such online risks is not the one expected. The framework suggested in this paper aims to contribute to socio-psychological and organizational values by enhancing the performance of the IS risk management process with a focus on security risks.
Study the Critical Role of Admixtures in Cement Production: The Optimum State of Cassiterite (SnO2) Addition as a Natural Mineralizer-Oxide Influencing the Cement Properties  [PDF]
Ioannis Baziotis, Andreas Chandrinos
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.14031
Abstract: In this work we evaluate the role of a natural mineralizer-oxide like cassiterite (SnO2) on the cement properties. In particular, we study the effect of different quantities of SnO2 with 0.5, 1.0, 1.5 and 2.0 wt% on burnability of industrial raw mix by free lime evaluation. We obtain four datasets, with successive increase of temperature at 1250℃, 1350℃, 1400℃ and 1450℃. We study the produced cassiterite-added clinker with X-ray diffraction (XRD), thermal analysis (DTA) and scanning electron microscopy (SEM). Though, we characterize the new phases formed and whether, adding excess SnO2 is promote forms of C3S, C2S influencing the final quality of cement.
Experimental Testing of Composite Panels Reinforced with Cotton Fibers  [PDF]
Ioannis G. Raftoyiannis
Open Journal of Composite Materials (OJCM) , 2012, DOI: 10.4236/ojcm.2012.22005
Abstract: A research project has been carried out at the National Technical University of Athens, Greece, to develop composite panels reinforced with cotton fibers. The primary aim of the project is to examine the mechanical properties of such panels for use in secondary structural members such as wall or door systems. The use of natural fibers such as cotton, flax or sisal fibers has the primary advantage of being eco-friendly, low cost and low weight compared to glass fibers on the expense of lower structural properties. This paper presents results from experimental work on composite plates made from polyester resin reinforced with cotton fibers, with special attention given to the effect of the fiber type on the structural properties of the plates. The results from this study showed that the structural performance of cotton fiber composites is satisfactory for structural parts with low requirements, such as wall panels or doors. The present results for cotton fiber composites are also compared to testing results from previous studies on composites with flax/sisal fibers.
Feature Extraction for Audio Classification of Gunshots Using the Hartley Transform  [PDF]
Ioannis Paraskevas, Maria Rangoussi
Open Journal of Acoustics (OJA) , 2012, DOI: 10.4236/oja.2012.23015
Abstract: In audio classification applications, features extracted from the frequency domain representation of signals are typically focused on the magnitude spectral content, while the phase spectral content is ignored. The conventional Fourier Phase Spectrum is a highly discontinuous function; thus, it is not appropriate for feature extraction for classification applications, where function continuity is required. In this work, the sources of phase spectral discontinuities are detected, categorized and compensated, resulting in a phase spectrum with significantly reduced discontinuities. The Hartley Phase Spectrum, introduced as an alternative to the conventional Fourier Phase Spectrum, encapsulates the phase content of the signal more efficiently compared with its Fourier counterpart because, among its other properties, it does not suffer from the phase ‘wrapping ambiguities’ introduced due to the inverse tangent function employed in the Fourier Phase Spectrum computation. In the proposed feature extraction method, statistical features extracted from the Hartley Phase Spectrum are combined with statistical features extracted from the magnitude related spectrum of the signals. The experimental results show that the classification score is higher in case the magnitude and the phase related features are combined, as compared with the case where only magnitude features are used.
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