20 results on '"Christos Christou"'
Search Results
2. Intestinal Neuronal Dysplasia Type B in Adults: A Controversial Entity
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Vasillis Vougas, Konstantinos Vardas, Christos Christou, Georgios Papadimitriou, Evangelia Florou, Christina Magkou, Dimitrios Karamanolis, Dimitrios Manganas, and Spiros Drakopoulos
- Subjects
Hyperganglionosis ,Chronic constipation ,Intestinal neuronal dysplasia ,Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Intestinal neuronal dysplasia (IND) is a well-defined entity which raises controversy among authors, described as a congenital malformation of gastrointestinal innervation and caused by dysplastic embryonal development of the enteric nervous system. It is potentially associated with mild and chronic gastrointestinal motility disturbances. IND is rarely reported in adults and especially elderly patients. The present study reports on the case of a 71-year-old man suffering from longstanding idiopathic constipation and who was misdiagnosed for more than 60 years, despite several hospital admissions and a sigmoidectomy in the meantime. On the last admission, the patient presented with megacolon, abdominal pain and X-ray finding of bowel obstruction. Due to massive large bowel dilatation, an exploratory laparotomy failed to reveal any obvious mechanical cause, and a subtotal colectomy and Hartmann's procedure was performed. Bowel continuity was performed 3 months later. Analysis of full-thickness biopsies revealed enlarged myenteric and submucosal neurons as well as an increased number of giant cells and increased acetylcholinesterase activity in the mucosa. The diagnosis of IND was established. The main diagnostic criteria, the underlining pathophysiology and the recommended therapeutic approach of this rare entity are extensively reviewed.
- Published
- 2014
- Full Text
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3. Reboot biomedical R&D in the global public interest
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Soumya Swaminathan, Bernard Pécoul, Hisham Abdullah, Christos Christou, Glenda Gray, Carel IJsselmuiden, Marie Paule Kieny, Mariana Mazzucato, Veronika von Messling, Bernhards Ogutu, John Reeder, John-Arne Røttingen, Renu Swarup, Marcel Tanner, Nísia Trindade Lima, Michelle Childs, Alex Harris, Els Torreele, and Suerie Moon
- Subjects
Multidisciplinary - Published
- 2022
4. Cord blood fatty acid‐binding protein‐4 levels are upregulated at both ends of the birthweight spectrum
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Konstantinos Voulgaris, Christos Christou, Sophia Georgantzi, Despina D. Briana, Evangelia Papathoma, Ariadne Malamitsi-Puchner, Antonios Marmarinos, Dimitrios Gourgiotis, Aimilia Eirini Papathanasiou, and Stavroula Gavrili
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Male ,Offspring ,Physiology ,Adipokine ,Gestational Age ,Fatty Acid-Binding Proteins ,Fatty acid-binding protein ,Fetal Development ,03 medical and health sciences ,0302 clinical medicine ,030225 pediatrics ,medicine ,Birth Weight ,Humans ,Prospective Studies ,030212 general & internal medicine ,reproductive and urinary physiology ,business.industry ,Infant, Newborn ,Gestational age ,General Medicine ,Fetal Blood ,medicine.disease ,Obesity ,Up-Regulation ,Cord blood ,Pediatrics, Perinatology and Child Health ,Population study ,Female ,Metabolic syndrome ,business - Abstract
Aim Fatty acid-binding protein-4 (FABP4) is an adipokine associated with obesity and signs of the metabolic syndrome. We aimed to investigate at birth in term neonates with normal and abnormal intrauterine growth concentrations of FABP4 and associate them with various perinatal parameters. Methods Serum cord blood FABP4 levels were prospectively determined by ELISA in 80 singleton term appropriate-for-gestational-age (AGA), intrauterine growth-restricted (IUGR) and large-for-gestational-age (LGA) neonates. Results Compared to the AGA group, cord blood FABP4 levels were increased in the IUGR and LGA groups. Additionally, they were higher in early-term than full-term neonates. A significant U-shaped correlation was recorded between serum FABP4 levels and birthweight. A significant negative correlation between cord blood FABP4 and gestational age in the whole study population was noted. Conclusion Cord blood FABP4 levels were significantly higher at the extremes of foetal growth at term and negatively correlated with gestational age, being increased in early-term versus full-term neonates. Further longitudinal studies with larger sample sizes are required to elucidate FABP4 implication in foetal growth and its association with future adverse cardiometabolic outcomes in the offspring.
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- 2019
5. Basics of Hospital Response
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Christos Christou
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medicine.medical_specialty ,Emergency management ,business.industry ,Public health ,Negative publicity ,medicine.disease ,Triage ,Mass-casualty incident ,Incident Command System ,medicine ,Business ,Medical emergency ,Disaster plan ,Recovery phase - Abstract
Hospitals that are not prepared to respond effectively to public health emergencies may risk increased morbidity and mortality of casualties, reduced ability to protect their own staff and facilities, and a prolonged recovery phase resulting in financial losses and negative publicity within the community.
- Published
- 2021
6. Safety, Efficacy and Long-Term Outcomes of Patients Treated with the Occlutech Paravalvular Leak Device for Significant Paravalvular Regurgitation
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Eustaquio Maria Onorato, Francesco Alamanni, Manuela Muratori, Grzegorz Smolka, Wojtek Wojakowski, Piotr Pysz, Aleksejus Zorinas, Diana Zakarkaite, Hélène Eltchaninoff, Pierre-Yves Litzer, François Godart, Patrick Calvert, Christos Christou, Abdurashid Mussayev, Bindo Missiroli, Igor Buzaev, Salvatore Curello, Tullio Tesorio, and Antonio Luca Bartorelli
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aortic valve ,device ,hemolysis ,long-term outcomes ,mitral valve ,paravalvular leak ,paravalvular regurgitation ,transcatheter closure ,General Medicine - Abstract
Between December 2014 and March 2021, 144 patients with aortic (Ao) or mitral (Mi) paravalvular leaks (PVLs) were enrolled at 21 sites in 10 countries. Safety data were available for 137 patients, who were included in the safety analysis fraction (SAF), 93 patients with Mi PVLs and 44 patients with Ao PVLs. The full analysis set (FAS) comprised 112 patients with available stratum (aortic/mitral leak) as well as baseline (BL), 180-day or later assessments (2 years). Procedural success (implantation of the device with a proper closure of the PVL, defined as reduction in paravalvular regurgitation of ≥one grade as assessed by echocardiography post implantation) was achieved in 91.3% of FAS patients with Mi PVLs and in 90.0% of those with Ao PVLs. The proportion of patients suffering from significant or severe heart failure (HF), classified as New York Heart Association (NYHA) class III/IV, decreased from 80% at baseline to 14.1% at 2-year follow-up (FAS). The proportion of FAS patients needing hemolysis-related blood transfusion decreased from 35.5% to 3.8% and from 8.1% to 0% in Mi patients and Ao patients, respectively. In total, 35 serious adverse events (SAEs) were reported in 27 patients (19.7%) of the SAF population. The SAEs considered possibly or probably related to the device included device embolization (three patients), residual leak (two patients) and vascular complication (one patient). During follow-up, 12/137 (8.8%) patients died, but none of the deaths was considered to be device-related. Patients implanted with the Occlutech Paravalvular Leak Device (PLD) showed long-lasting improvements in clinical parameters, including NYHA class and a reduced dependency on hemolysis-related blood transfusions.
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- 2022
7. 1-Year Clinical Outcomes of All-Comer Patients Treated With the Dual-Therapy COMBO Stent
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Robbert J. de Winter, Jaya Chandrasekhar, Deborah N. Kalkman, Melissa B. Aquino, Pier Woudstra, Marcel A. Beijk, Samantha Sartori, Usman Baber, Jan G. Tijssen, Karel T. Koch, George D. Dangas, Antonio Colombo, Roxana Mehran, Tiong Kiam Ong, Michael Lee, Andres Iniguez, Stephen Rowland, Newsha Ghodsi, Steven Marx, Douglas DiStefano, Jesse Weinberger, Shing Chiu Wong, Bruce Darrow, David Kaufman, Mark Milstein, Melissa Aquino, Clayton Snyder, Theresa Franklin-Bond, Jin Young Cha, Lynn Vandertie, Emma Whittaker, Kate Allen, Birgit Vogel, Serdar Farhan, Sabato Sorrentino, Zhen Ge, Marc Carlier, Suzanne Pourbaix, Borislav Borisov, Borislav Atzev, Dobrin Vasilev, Christos Christou, Ladislav Pešl, Zdeněk Coufal, Petr Kala, Petr Jeřábek, Petr Hájek, Alexander Schee, Roman Ondrejcak, Vladimír Rozsíval, Jan Matějka, Martin Mates, Ahmed Khashaba, Hazem Warda, Sulev Margus, Bryan Yan, Cheuk Sum Lam, Tak Sun Chung, Li Wah Tam, Alan Ka Chun Chan, Ping Tim Tsui, Kin Lam Tsui, Teguh Santoso, Muhammad Munawar, Muhammad Syukri, Dasdo Antonius Sinaga, Alessandro Lupi, Carlo Briguori, Oteh Maskon, Sazzli Kazim, Chuey Yan Lee, Houng Bang Liew, Rosli Mohammad Ali, Ramesh Singh, Peter Den Heijer, Jaroslaw Wojcik, Vladan Vukčević, Martin Hudec, Anton Farkaš, Stanislav Juhás, Monika Jankajová, Milan Dragula, Carlos Cuellas Ramon, Paula Tejedor, Fernando Lozano Ruiz-Poveda, Alfonso Torres Bosco, Essia Boughzela, Medhi Slim, Habib Haouala, Dhaker Lahidheb, Mohamed Rachid Boujnah, Grahame K. Goode, Sukhbir Dhamrait, Robert Gerber, Piers Clifford, Timothy Kinnaird, Gabriel Varnagy, Pedro J. Aguiar R., Thuong Van Huynh, Ian B Menown, Peter den Heijer, Arnoud WJ van't Hof, Andrejs Erglis, Harry Suryapranata, Karin E Arkenbout, Andrés Iñiguez, Philippe Muller, Jan Tijssen, Robbert J de Winter, Marcel A Beijk, Karel Koch, and Deborah N Kalkman
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Target lesion ,medicine.medical_specialty ,Acute coronary syndrome ,Everolimus ,business.industry ,medicine.medical_treatment ,Stent ,Percutaneous coronary intervention ,030204 cardiovascular system & hematology ,equipment and supplies ,medicine.disease ,Surgery ,03 medical and health sciences ,0302 clinical medicine ,Sirolimus ,medicine ,Clinical endpoint ,030212 general & internal medicine ,Myocardial infarction ,Cardiology and Cardiovascular Medicine ,business ,medicine.drug - Abstract
Objectives The aim of this study was to evaluate 1-year clinical safety and efficacy of the dual-therapy COMBO stent in a large, all-comers patient-level pooled cohort. Background The COMBO stent (OrbusNeich Medical, Fort Lauderdale, Florida) is a novel stent with abluminal sirolimus elution from a biodegradable polymer and a luminal pro-healing anti-CD34+ antibody layer, which attracts circulating endothelial progenitor cells. These endothelial progenitor cells can quickly mature into normal endothelium, providing rapid endothelialization. Methods The MASCOT (Multinational Abluminal Sirolimus Coated biO-engineered stenT) (N = 2,614, 61 global sites) and REMEDEE (Randomized study to Evaluate the safety and effectiveness of an abluMinal sirolimus coatED bio-Engineered StEnt Post Market Registry) (N = 1,000, 9 European sites) registries are 2 prospective, multicenter studies evaluating clinical outcomes after attempted COMBO stent placement in all-comer patients undergoing percutaneous coronary intervention. In this patient-level pooled analysis we analyzed 1-year target lesion failure (TLF), a composite of cardiac death, target vessel myocardial infarction, or clinically driven target lesion revascularization. Furthermore, we determined predictors of 1-year TLF. Results A total of 3,614 patients (63.5 ± 11.2 years of age; 23.8% women) were included in this analysis. The prevalence of diabetes mellitus was 29.3%, and 54.3% patients presented with acute coronary syndrome. The primary endpoint of 1-year TLF occurred in 140 (3.9%) patients, with incidence of cardiac death in 1.6%, target vessel myocardial infarction in 1.2%, clinically driven target lesion revascularization in 2.2%, and definite stent thrombosis in 0.5% patients. Insulin-treated diabetes mellitus, chronic renal failure, and American College of Cardiology/American Heart Association lesion type B2/C were independent predictors of 1-year TLF. Conclusions In this large patient-level pooled analysis of patients treated with the dual-therapy COMBO stent excellent results at 1-year were observed. (MASCOT - Post Marketing Registry [MASCOT]; NCT02183454; Prospective Registry to Assess the Long-term Safety and Performance of the COMBO Stent [REMEDEE Reg]; NCT01874002)
- Published
- 2018
8. Inhibitors of osteoblastogenesis in early human milk and maternal serum: evidence for protective properties of mother’s milk on bone
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Antonios Marmarinos, Dimitrios Gourgiotis, Konstantinos Voulgaris, Sophia Georgantzi, Stavroula Gavrili, Christos Christou, Despina D. Briana, and Ariadne Malamitsi-Puchner
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Adult ,Male ,0301 basic medicine ,medicine.medical_specialty ,030209 endocrinology & metabolism ,Breast milk ,Bone remodeling ,Young Adult ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Osteogenesis ,Lactation ,Internal medicine ,Humans ,Medicine ,Prospective Studies ,Wnt Signaling Pathway ,Adaptor Proteins, Signal Transducing ,Milk, Human ,business.industry ,Infant, Newborn ,Wnt signaling pathway ,Obstetrics and Gynecology ,Early life ,030104 developmental biology ,medicine.anatomical_structure ,Mother's milk ,Endocrinology ,DKK1 ,chemistry ,Pediatrics, Perinatology and Child Health ,Intercellular Signaling Peptides and Proteins ,Sclerostin ,Female ,business - Abstract
Objective: Lactation is associated with a dramatic increase of maternal bone turnover, leading to a reversible bone loss. Early life nutrition may influence later osteoporosis risk. Protein...
- Published
- 2018
9. Long-Term Functional Outcome and Quality of Life After Restorative Proctocolectomy With Mucosectomy and Hand Suture IPAA: 20 Years' Experience in 326 Patients
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Theofilos Rosenberg, Sotirios Baratsis, Aristotelis Chatziioannou, Efthymios Ladoukakis, Theodoros Emmanouil, and Christos Christou
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medicine.medical_specialty ,business.industry ,Proctocolectomy ,General surgery ,medicine.medical_treatment ,Pouchitis ,Anastomosis ,medicine.disease ,Ulcerative colitis ,Familial adenomatous polyposis ,Surgery ,03 medical and health sciences ,0302 clinical medicine ,Suture (anatomy) ,Quality of life ,030220 oncology & carcinogenesis ,medicine ,030211 gastroenterology & hepatology ,Surgical treatment ,business - Abstract
This paper was designed to evaluate the functional outcome and assess the long-term quality of life (QoL) of patients who underwent restorative proctocolectomy with mucosectomy and hand suture ileal pouch-anal anastomosis (IPAA) over 20 years. Restorative proctocolectomy with IPAA is the surgical treatment of choice to all familial adenomatous polyposis (FAP) patients and those with ulcerative colitis (UC) not responding to conservative management. The procedure has been modified from a transanal hand-suture IPAA after mucosectomy to a stapled IPAA without mucosectomy, but the benefits are still debatable. We studied retrospectively all UC and FAP patients subjected to the procedure between 1987 and 2006, using the SF-36 Health Survey, the Wexner score for incontinence, and an additional questionnaire evaluating various aspects of functional outcome and late complications. A total of 326 patients (53% male) were included in the study. Pouchitis was recorded in 31% of UC and 5% of FAP patients. Anastomotic stricture was observed in 24% of UC and 8% of FAP patients. IPAA-related pouch failures occurred in 9% of UC and 3% of FAP. The median number of bowel movements per 24 hours was 6 (range: 2–20) with 1 (range: 0–8) bowel motion occurring at night. Wexner score was 3.27 (±0.32) for UC and 1.22 (±0.36) for FAP. The overall norm-based SF-36 score for physical/mental health status was 52.85/50.31 and 57.29/50.05 respectively. Restorative proctocolectomy with mucosectomy and hand suture IPAA is a safe procedure with good functional results and quality of life in well-satisfied patients. Pouchitis, anastomotic strictures, and pouch failures were mainly observed in the UC group.
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- 2016
10. Preadipocyte factor-1 in maternal, umbilical cord serum and breast milk: The impact of fetal growth
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Aimilia Eirini Papathanasiou, Stavroula Gavrili, Antonios Marmarinos, Konstantinos Voulgaris, Despina D. Briana, Dimitrios Gourgiotis, Ariadne Malamitsi-Puchner, Sophia Georgantzi, and Christos Christou
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0301 basic medicine ,Male ,Immunology ,Adipokine ,Gestational Age ,Breast milk ,Biochemistry ,Preeclampsia ,Umbilical Cord ,Andrology ,Fetal Development ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Pregnancy ,Adipocyte ,medicine ,Immunology and Allergy ,Humans ,Molecular Biology ,Fetus ,Fetal Growth Retardation ,Milk, Human ,business.industry ,Calcium-Binding Proteins ,Gestational age ,Membrane Proteins ,Hematology ,medicine.disease ,Fetal Blood ,Gestational diabetes ,030104 developmental biology ,chemistry ,030220 oncology & carcinogenesis ,Female ,business ,Umbilical Cord Serum - Abstract
To study the concentrations of preadipocyte factor-1 (Pref-1) -an inhibitor of adipocyte differentiation, implicated in adipose tissue metabolism, late metabolic disorders and fetal growth- in maternal and umbilical cord serum, as well as maternal milk and correlate above concentrations with intrauterine growth and other perinatal parameters.Pref-1 concentrations were determined by ELISA in antepartum maternal and umbilical cord serum, as well as day 3 to 4 postpartum breast milk, deriving from 80 women, who delivered 40 appropriate (AGA), 20 large for gestational age (LGA) and 20 intrauterine growth restricted (IUGR) neonates, classified by the use of customized birth-weight standards adjusted for significant determinants of fetal growth.Umbilical cord serum Pref-1 concentrations were significantly higher than antepartum maternal ones (p 0.001), while breast milk concentrations were the lowest (p 0.001 concerning umbilical serum, p 0.001 concerning maternal serum). Umbilical cord serum Pref-1 concentrations were significantly lower in the LGA group than in the AGA one (p = 0.044). Breast milk and maternal serum Pref-1 concentrations did not differ between the three intrauterine growth groups. Maternal serum and breast milk Pref-1 concentrations did not correlate with maternal age, body mass index before and after gestation, birth weight, body length, and customized centile. A positive weak correlation was recorded between maternal serum and milk Pref-1 concentrations (r = 0.238, p = 0.034).Pref-1 concentrations in umbilical cord serum are higher than in antepartum maternal serum, probably pointing to its fetal origin and role in intrauterine growth. Breast milk concentrations, being extremely low, and possibly implying infant protection from metabolic disorders, positively correlate with maternal serum ones, conceivably suggesting a transfer of the substance from the circulation to the breast. Umbilical cord serum Pref-1 concentrations were lower in LGA fetuses/neonates, as compared to respective AGA ones.
- Published
- 2018
11. Diffusion with Resetting Inside a Circle
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Christos Christou, Abhinava Chatterjee, and Andreas Schadschneider
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Physics ,Statistical Mechanics (cond-mat.stat-mech) ,Numerical analysis ,Mathematical analysis ,FOS: Physical sciences ,01 natural sciences ,010305 fluids & plasmas ,Formalism (philosophy of mathematics) ,Constant rate ,Bounded function ,0103 physical sciences ,010306 general physics ,Brownian motion ,Condensed Matter - Statistical Mechanics - Abstract
We study the Brownian motion of a particle in a bounded circular 2-dimensional domain, in search for a stationary target on the boundary of the domain. The process switches between two modes: one where it performs a two-dimensional diffusion inside the circle and one where it travels along the one-dimensional boundary. During the diffusion, the Brownian particle resets to its initial position with a constant rate $r$. The Fokker-Planck formalism allows us to calculate the mean time to absorption (MTA) as well as the optimal resetting rate for which the MTA is minimized. From the derived analytical results the parameter regions where resetting reduces the search time can be specified. We also provide a numerical method for the verification of our results., 11 pages, 10 figures
- Published
- 2018
12. Triathlon, Loving It Is Easy. : Swim, Bike, Run: The Ultimate Beginner’s Guide
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Christos Christou and Christos Christou
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- Triathlon--Training
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Swim, Bike, Run. The Ultimate Beginner's Guide In the quest for understanding this beautiful and increasingly popular sport, “Triathlon. Loving it is easy” is the definitive starter's book for the aspiring triathlete. This comprehensive, easy to follow guide is packed with practical ways that will help you: • Understand the sport of triathlon • Understand how you fit into this discipline, regardless of your physical condition• Comprehend how each discipline functions and learn how to properly run, swim, bike and transition • Understand how you can improve your performance • Train properly, train prudently, train efficiently • Develop a training plan best suited to your needs, goals, and capabilities• Prepare for your first race • Help you avoid common mistakes that are both costly and time-consuming, and last but not least, • Realize your full potential and enjoy yourself in the process! “Triathlon. Loving it is easy” was written by a man who has lived and breathed sports all his life and triathlon for the last 15 years. As a member of his country's national team he has competed in numerous triathlon events throughout Europe. Christos's book was the first of its kind written in Greek. Now in its revised 3rd edition, it has created a craze for triathlon throughout the Greek world. “Triathlon. Loving it is easy” covers all areas of the sport including: • Principles of Athletic training as well as the mission of every physical education teacher• A short history of the sport; formats and distances • SWIMMING; Basics of the freestyle technique, swimming exercises, proper kit • CYCLING; Techniques, styles, exercises, kit• RUNNING; Run more efficiently and avoid injuries• Three in one • Training program • Basic parameters for a training schedule • Training technique • Examples of training programs • Strength training for Triathlon • Do pre-race jitters help performance? • Transition, the fourth discipline • Common gastrointestinal issues• Missed workout guilt• Your first race And more… Apart from a wealth of athletic and scientific information, Christos shares his personal experiences with a sense of humor and honesty rarely seen in sports books. Christos is not only an accomplished author; he is a physical education professional but above all else, he is a triathlete. Who better to guide you in your exciting journey than a fellow sports enthusiast? --------- Here are some comments: “I am very glad to see just how many people have benefited from this book and to see how successful it has been in bringing so many new people closer to our favorite sport” Vassilis Krommidas, World youth Ironman record holder --- “Christos knows all the difficulties and technical specifics of running, swimming and cycling, since for him triathlon is a way of life“ Hon. Prof. Ouranios M. Ioannides, President - Cyprus Olympic Committee --- “…a committed, pioneering work based on solid scientific knowledge of the subject, enriched by intense personal experiences… this book is an important guide for people who are looking for different sports disciplines and hoping to try something new…” Pambos Stylianou, President - Cyprus Sports Organisation
- Published
- 2018
13. Intestinal Neuronal Dysplasia Type B in Adults: A Controversial Entity
- Author
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Georgios Papadimitriou, Konstantinos Vardas, Dimitrios Karamanolis, Spiros Drakopoulos, Vasillis Vougas, Dimitrios Manganas, Evangelia Florou, Christos Christou, and Christina Magkou
- Subjects
medicine.medical_specialty ,Abdominal pain ,Chronic constipation ,Intestinal neuronal dysplasia ,Constipation ,Megacolon ,business.industry ,Exploratory laparotomy ,medicine.medical_treatment ,Gastroenterology ,medicine.disease ,Surgery ,Bowel obstruction ,Published online: January, 2014 ,Hyperganglionosis ,Internal medicine ,medicine ,lcsh:Diseases of the digestive system. Gastroenterology ,Enteric nervous system ,lcsh:RC799-869 ,medicine.symptom ,business - Abstract
Intestinal neuronal dysplasia (IND) is a well-defined entity which raises controversy among authors, described as a congenital malformation of gastrointestinal innervation and caused by dysplastic embryonal development of the enteric nervous system. It is potentially associated with mild and chronic gastrointestinal motility disturbances. IND is rarely reported in adults and especially elderly patients. The present study reports on the case of a 71-year-old man suffering from longstanding idiopathic constipation and who was misdiagnosed for more than 60 years, despite several hospital admissions and a sigmoidectomy in the meantime. On the last admission, the patient presented with megacolon, abdominal pain and X-ray finding of bowel obstruction. Due to massive large bowel dilatation, an exploratory laparotomy failed to reveal any obvious mechanical cause, and a subtotal colectomy and Hartmann's procedure was performed. Bowel continuity was performed 3 months later. Analysis of full-thickness biopsies revealed enlarged myenteric and submucosal neurons as well as an increased number of giant cells and increased acetylcholinesterase activity in the mucosa. The diagnosis of IND was established. The main diagnostic criteria, the underlining pathophysiology and the recommended therapeutic approach of this rare entity are extensively reviewed.
- Published
- 2014
14. Murine typhus in Cyprus: a 9-year survey
- Author
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Dimosthenis Chochlakis, Giorgos Giorgalas, Yannis Tselentis, Anna Psaroulaki, Leonidas Georgalis, Christos Christou, Vassilios Sandalakis, Ioannis Ioannou, and Ioanna Tsiligianni
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Adult ,Male ,Rural Population ,medicine.medical_specialty ,Veterinary medicine ,Adolescent ,Urban Population ,Population ,Murine typhus ,Communicable Diseases, Emerging ,Young Adult ,Rickettsia typhi ,Epidemiology ,medicine ,Animals ,Humans ,Longitudinal Studies ,education ,Child ,Aged ,Aged, 80 and over ,education.field_of_study ,Travel ,biology ,Incidence (epidemiology) ,Incidence ,Public Health, Environmental and Occupational Health ,Typhus, Endemic Flea-Borne ,General Medicine ,Middle Aged ,medicine.disease ,biology.organism_classification ,Rats ,Suburban Population ,Infectious Diseases ,Geography ,Child, Preschool ,Cyprus ,Siphonaptera ,Parasitology ,Residence ,Female ,Seasons ,Rural area ,Typhus ,Demography - Abstract
Epidemiological and clinical data of 193 human cases of murine typhus in Cyprus were recorded and analysed during a 9-year period (2000-2008). The incidence rate was estimated at 24.5 cases/100,000 population/year. The incidence rate varied considerably between rural, urban and semi-urban areas, with residents in rural areas accounting for 79.3% of the total cases. Most (72.5%) of the cases occurred in late summer (July and August) and early autumn (September to October) with a peak in September. Well-established persistent endemic foci with clusters of cases were identified and characterised as 'high risk' areas. Presence of or contact with rats and fleas, presence of domestic/peridomestic animals and residence in rural areas, especially locations near the 'green line' (a narrow zone patrolled by UN forces that separates the northern and southern parts of the island), increased the possibility of murine typhus infection. The results of the current study enhance the belief that murine typhus is a serious public health problem in Cyprus.
- Published
- 2011
15. Isolated right atrial metastasis of malignant melanoma mimicking a myxoma
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Loizos, Kontozis, Marinos, Soteriou, Demetris, Papamichael, Constantinos, Economides, Evis, Bagdades, Christos, Christou, and Christina, Oxynou
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Diagnosis, Differential ,Heart Neoplasms ,Skin Neoplasms ,Humans ,Female ,Heart Atria ,Middle Aged ,Melanoma ,Myxoma ,Echocardiography, Transesophageal - Abstract
Malignant melanoma is the malignancy with the highest propensity for cardiac metastasis. Metastasis to the heart usually occurs in the setting of disseminated disease and is therefore commonly associated with a poor prognosis. We report the case of a 51-year-old woman with a previous history of cutaneous malignant melanoma who presented with a symptomatic, isolated right atrial metastasis attached via a narrow stalk to the interatrial septum, thus resembling a myxoma. The lesion was completely resected, rendering the patient symptom and, potentially, disease-free. The case illustrates the importance of cardiac evaluation in the management of patients with melanoma.
- Published
- 2011
16. Rickettsia typhi and Rickettsia felis in Xenopsylla cheopis and Leptopsylla segnis Parasitizing Rats in Cyprus
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Christos Christou, Dimosthenis Chochlakis, Ioannis Ioannou, Apostolos Mazeris, Yannis Tselentis, Maria Antoniou, Pavlos Toumazos, and Anna Psaroulaki
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animal diseases ,Murine typhus ,Rickettsiaceae ,Microbiology ,Virology ,Rickettsia typhi ,medicine ,Animals ,Pathogen ,biology ,Felis ,Articles ,biology.organism_classification ,medicine.disease ,bacterial infections and mycoses ,Rickettsia felis ,Rats ,Infectious Diseases ,Cyprus ,bacteria ,Siphonaptera ,Parasitology ,Rickettsiales ,Xenopsylla - Abstract
Fleas collected from rats during a three-year period (2000-2003) in 51 areas of all provinces of Cyprus were tested by molecular analysis to characterize the prevalence and identity of fleaborne rickettsiae. Rickettsia typhi, the causative agent of murine typhus, was detected in Xenopsylla cheopis (4%) and in Leptopsylla segnis (6.6%). Rickettsia felis was detected in X. cheopis (1%). This is the first report of R. typhi in X. cheopis and L. segnis from rats, in Cyprus, and the first report of R. felis in X. cheopis in Europe. The role of fleas (mainly X. cheopis) was confirmed in the epidemiologic cycle of murine typhus in Cyprus by interrelation of current results with those of previous studies. The geographic distribution of fleas coincided with the geographic distribution of the pathogen they can harbor, which emphasizes the potential risk of flea-transmitted infections in Cyprus.
- Published
- 2010
17. GIG QoS Inter-Domain Interoperability Challenges
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John Evans, Yong Xue, Christos Christou, Christopher Gedo, and Christina Dee
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Engineering ,Management information systems ,business.industry ,Inter-domain ,Distributed computing ,Quality of service ,Interface (computing) ,Global Information Grid ,Interoperability ,Information system ,business ,Networking hardware ,Computer network - Abstract
The Global Information Grid (GIG), is a large and complex undertaking that is intended to integrate virtually all DoD information systems, services, and applications into one seamless, reliable, and secure network. The GIG Transport Segment will be comprised of multiple different network types, each implementing a QoS solution that best fits the network's user needs. Each QoS solution implements different QoS mechanisms across the data, control, and management functional planes and may be reliant on network hardware that is not implemented GIG-wide. Interoperability challenges between these different QoS solutions need to be documented and analyzed to facilitate the delivery of traffic end-to-end across multiple GIG networks. This paper will provide an overview of the GIG Transport Segment, describe network-to-network interface connections, categorize different types of QoS solutions that are being applied to GIG networks, and discuss inter-domain challenges associated with interconnecting these types of solutions.
- Published
- 2007
18. Diffusion with resetting in bounded domains
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Christos Christou and Andreas Schadschneider
- Subjects
Statistics and Probability ,Phase transition ,Steady state ,Differential equation ,Mathematical analysis ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Domain (mathematical analysis) ,Control theory ,Modeling and Simulation ,Bounded function ,Master equation ,Special case ,Diffusion (business) ,Mathematical Physics ,Mathematics - Abstract
We consider the one-dimensional diffusion in a bounded domain with stochastic resetting. We start our analysis by presenting a method to derive the master equation for different resetting mechanisms. In the next step we compute the non-equilibrium steady state for a special case of this differential equation. Then we consider the existence of an absorbing point in the system and calculate the mean time to absorption of the diffusive particle by the target. Numerical and analytical calculations of the optimal resetting rate reveal a second order phase transition. Finally we discuss different special cases of the presented problem.
- Published
- 2015
19. Characterization of the radiation from a low-energy X-pinch source
- Author
-
Christos Christou and Peter Choi
- Subjects
Physics ,Range (particle radiation) ,business.industry ,Astrophysics::High Energy Astrophysical Phenomena ,Power factor ,Plasma ,Radiation ,Pulsed power ,law.invention ,Capacitor ,Optics ,law ,Pinch ,Optoelectronics ,business ,Low voltage - Abstract
The explosion of a single wire with a high current pulse has long been established as an excellent source of x-ray radiation. However, experimental analysis of single wire explosions shows that the radiation is emitted from an inhomogeneous plasma consisting of high-density high-energy emitting points located randomly in a low density background column. The X- pinch, in which two or more crossed wires are exploded by a large current pulse driven by a low inductance source, is a good source of soft x-ray radiation in the energy range of 100 eV to 10 keV. The geometry of the crossed wire load ensures that the plasma emitting the bulk of the harder radiation is reproducibly located at the crossing point of the wires. This renders the source ideal for applications such as x-ray microscopy and lithography. Previous work on X- pinches has been carried out using elaborate high-voltage pulsed power generators delivering a brief high current pulse. Results are presented here of a first comprehensive study of X-pinch discharges driven by a low energy (4 kJ), low voltage (30 kV) 9 (mu) F capacitor bank. X- ray emission from X-pinches made from a variety of wires of different sizes and materials is characterized and compared with x-ray emission from single wire discharges. Radiation output is measured for different spectral regimes and information is presented concerning both the spatial and temporal emission of the radiation. Conditions for optimal soft x-ray yield on such low power machines are established.
- Published
- 1991
20. A Comparison Of The Hellenic Leagues Of Philip Ii And Demetrius I Of Macedonia.
- Author
-
Patsavos, Christos Christou
- Subjects
- Comparison, Demetrius, Hellenic, Ii, Leagues, Macedonia, Philip
- Published
- 1957
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