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Shape of Compact Toroidal Dimensions T_θ~d and Casimir Effect on M^D×T_θ~d Spacetime

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Communications in Theoretical Physics 2011年第1期55卷 101-110页

作者： V.K.oikonomou Department of Theoretical Physics Aristotle University of Thessaloniki Technological Education Institute of Serres

We study the influence of the shape of compact a scalar field. We examine both the massive and the massless dimensions to the Casimir energy and Casimir force of scalar field. The total spacetime topology is M^D × Tθ2, where M^D） is the D-dimensional Minkowski spacetime and Tθ2 the twisted torus described by R1, R2, and 8. For the case R1 = R2 we found that the massive bulk scalar field Casimir energy is singular for D=even and this singularity is R-dependent and remains even when the force is calculated. Also the massless Casimir energy and force is regular only for D = 4 （!）. This is very interesting phenomenologically. We examine the energy and force as a function of 8. Also we address the stabilization problem of the compact space. We also briefly discuss some phenomenological implications.

关键词： Casimir energy Casimir force extra dimensions twisted torus shadowing effect zeta dimensions

Antithrombotic therapy in TAVI

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Journal of Geriatric Cardiology 2018年第1期15卷 66-75页

作者： Manolis Vavuranakis Konstantinos Kalogeras Angelos Michail Kolokathis Dimitrios Vrachatis Nikolaos Magkoutis Gerasimos Siasos Euaggelos oikonomou maria Kariori Theodoros Papaioannou maria Lavda Carmen Moldovan Ourania Katsarou Dimitrios Tousoulis The First Department of Cardiology Hippokration Hospital Medical School National & Kapodistrian University of Athens Ilioupoli Greece

Transcatheter aortic valve implantation （TAVI） carries a significant thromboembolic and concomitant bleeding risk, not only during the procedure but also during the periprocedural period. Many issues concerning optimal antithrombotic therapy after TAVI are still under debate. In the present review, we aimed to identify all relevant studies evaluating antithrombotic therapeutic strategies in relation to clinical outcomes after the procedure. Four randomized control trials （RCT） were identified analyzing the post-TAVI antithrombotic strategy with all of them utilizing aspirin lifelong plus clopidogrel for 3-6 months. Seventeen registries have been identified, with a wide variance among them regarding baseline characteristics, while concerning antiplatelet therapy, clopidogrel duration was ranging from 3-12 months. Four non-randomized trials were identified, comparing single vs. dual antiplatelet therapy after TAVI, in respect of investigating thromboembolic outcome events over bleeding complications. Finally, limited data from a single RCT and a retrospective study exist with regards to anticoagulant treatment during the procedure and the optimal antithrombotic therapy when concomitant atrial fibrillation. In conclusion, due to the high risk and frailty of the treated population, antithrombotic therapy after TAVI should be carefully evaluated. Diminishing ischaemic and bleeding complications remains the main challenge in these patients with further studies to be needed in this field.

关键词： Antiplatelets Antithrombotic Bleeding Stroke Transcatheter aortic valve implantation

Prevention,diagnostic evaluation,management and prognostic implications of liver disease in critically ill patients with COVID-19

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World Journal of Clinical Cases 2023年第3期11卷 514-527页

作者： Asimina Valsamaki maria Xanthoudaki Katerina G oikonomou Panagiotis J Vlachostergios AntoniosPapadogoulas Periklis Katsiafylloudis Ioanna Voulgaridi Apostolia-Lemonia Skoura Apostolos Komnos Panagiotis Papamichalis Intensive Care Unit General Hospital of LarissaLarissa 41221Greece Division of Hematology and Medical Oncology Department of MedicineWeill Cornell MedicineNew YorkNY 10065United States Department of Microbiology General Hospital of LarissaLarissa 41221Greece Transfusion Medicine Department University Hospital of LarissaLarissa 41110Greece

Coronavirus disease 2019(COVID-19),caused by severe acute respiratory syndrome coronavirus 2,broke out in December 2019 in Wuhan city of China and spread rapidly ***,by March 2020,the World Health Organization declared the disease a global *** from the respiratory system,various other organs of the human body are also seriously affected by the *** injury in patients with a severe form of COVID-19 is estimated to be 14.8%-53.0%.Elevated levels of total bilirubin,aspartate aminotransferase and alanine aminotransferase and low levels of serum albumin and prealbumin are the main laboratory *** with pre-existing chronic liver disease and cirrhosis are much more prone to develop severe liver *** literature review presented the recent scientific findings regarding the pathophysiological mechanisms responsible for liver injury in critically ill patients with COVID-19,the various interactions between drugs used to treat the disease and the function of the liver and the specific tests providing the possibility of early diagnosis of severe liver injury in these ***,it highlighted the burden that COVID-19 put on health systems worldwide and its effect on transplant programs and the care provided to critically ill patients in general and particularly to those with chronic liver disease.

关键词： Coronavirus disease 2019 Severe acute respiratory syndrome coronavirus 2 Liver disease Intensive care unit Liver unit Prealbumin

Fecal DNA testing for colorectal cancer screening:molecular targets and perspectives

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World Journal of Gastrointestinal Oncology 2015年第10期7卷 178-183页

作者： Amaninder Dhaliwal Panagiotis J Vlachostergios Katerina G oikonomou Yitzchak Moshenyat Department of Medicine NYU Lutheran Medical Center Division of Gastroenterology NYU Lutheran Medical Center

The early detection of colorectal cancer with effective screening is essential for reduction of cancer-specific mortality. The addition of fecal DNA testing in the armamentarium of screening methods already in clinical use launches a new era in the noninvasive part of colorectal cancer screening and emanates from a large number of previous and ongoing clinical investigations and technological advancements. In this review, we discuss the molecular rational and most important genetic alterations hallmarking the early colorectal carcinogenesis process. Also, representative DNA targets-markers and key aspects of their testing at the clinical level in comparison or/and association with other screening methods are described. Finally, a critical view of the strengths and limitations of fecal DNA tests is provided, along with anticipated barriers and suggestions for further exploitation of their use.

关键词： Colorectal cancer Screening Fecal DNA Cologuard^(■) Adenoma

Clinical impact of microbiome in patients with decompensated cirrhosis

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World Journal of Gastroenterology 2018年第34期24卷 3813-3820页

作者： Theodora oikonomou George V Papatheodoridis Michael Samarkos Ioannis Goulis Evangelos Cholongitas Fourth Department of Internal Medicine Hippokration General Hospital Medical School of Aristotle University of Thessaloniki Academic Department of Gastroenterology Laiko General Hospital Medical School of National and Kapodistrian University of Athens First Department of Internal Medicine Laiko General Hospital Medical School of National and Kapodistrian University of Athens

Cirrhosis is an increasing cause of morbidity and mortality. Recent studies are trying to clarify the role of microbiome in clinical exacerbation of patients with decompensated cirrhosis. Nowadays, it is accepted that patients with cirrhosis have altered salivary and enteric microbiome, characterized by the presence of dysbiosis. This altered microbiome along with small bowel bacterial overgrowth, through translocation across the gut, is associated with the development of decompensating complications. Studies have analyzed the correlation of certain bacterial families with the development of hepatic encephalopathy in cirrhotics. In general, stool and saliva dysbiosis with reduction of autochthonous bacteria in patients with cirrhosis incites changes in bacterial defenses and higher risk for bacterial infections, such as spontaneous bacterial peritonitis, and sepsis. Gut microbiome has even been associated with oncogenic pathways and under circumstances might promote the development of hepatocarcinogenesis. Lately, the existence of the oral-gutliver axis has been related with the development of decompensating events. This link between the liver and the oral cavity could be via the gut through impaired intestinal permeability that allows direct translocation of bacteria from the oral cavity to the systemic circulation. Overall, the contribution of the microbiome to pathogenesis becomes more pronounced with progressive disease and therefore may represent an important therapeutic target in the management of cirrhosis.

关键词： Microbiome Dysbiosis Oral-gut-liver axis Hepatic encephalopathy Decompensated cirrhosis Liver carcinoma

Takotsubo cardiomyopathy complicating transcatheter mitral valve-in-valve replacement

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Journal of Geriatric Cardiology 2022年第7期19卷 559-561页

作者： maria Drakopoulou George oikonomou George Latsios Andreas Synetos George Benetos Chrysavgi Simopoulou Anastasios Apostolos Stergios Soulaidopoulos Konstantina Aggeli Vasilios Lozos Dimitrios Lymperiadis Costas Tsioufis Konstantinos Toutouzas First Department of Cardiology Medical SchoolNational and Kapodistrian University of AthensHippokration General Hospital of AthensAthensGreece Department of Cardiac Surgery Hippokration General Hospital of AthensAthensGreece

A 73-year-old female presented with symp-tomatic heart failure(NYHA class Ⅲ)due to a failed 29-mm Sorin(*** Medical,***,MN)bioprosthetic heart valve surgically implanted 10-year before for severe primary mitral valve regurgitation(flail of the anterior mitral leaf-let at A2 scallop).Preprocedural echocardiography showed preserved left ventricular function with severe bioprosthetic valve stenosis and concomit-ant moderate regurgitation(Video 1 in Supplement).Because of prohibitive surgical risk,a transeptal mitral valve-in-valve(ViV)replacement was planned.

关键词： valve mitral replacement

Influence of education and residence on the parental search for pediatric surgical information on the internet

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World Journal of Clinical Pediatrics 2021年第5期10卷 93-105页

作者： maria Aggelidou Savas P Deftereos Dimitrios C Cassimos Konstantinos Skarentzos Panagoula oikonomou Artemis Angelidou Christina Nikolaou George Koufopoulos Katerina Kambouri Department of Pediatric Surgery Democritus University of ThraceUniversity Hospital of AlexandroupolisAlexandroupolis 68100Greece Department of Radiology University Hospital of AlexandroupolisDemocritus University of ThraceAlexandroupolis 68100Greece Department of Pediatrics Alexandroupolis University HospitalAlexandroupolis 68100Greece Student of Medicine Alexandroupolis University HospitalAlexandroupolis 68100Greece Department of Surgery Alexandroupolis University HospitalAlexandroupolis 68100Greece Student of Molecular Biology Alexandroupolis University HospitalAlexandroupolis 68100Greece Department of Surgery Laiko General HospitalAthens 11527Greece Department of Pediatric Surgery Alexandroupoli University HospitalDemocritus University of ThraceAlexandroupoli 68132Greece

BACKGROUND The internet is a valuable tool for access to health-related *** is limited literature regarding its use by parents of children with surgical *** To investigate internet usage by parents seeking information about the surgical conditions of their offspring in relation to epidemiological factors such as family residential area and parental educational level and to subsequently review the literature regarding this *** An anonymous questionnaire about internet usage was completed by eligible parents of children who were admitted to our clinic for minor surgical procedures during a six-month *** Our results demonstrated that the internet has been mostly used by mothers for children’s health *** was the most commonly used search engine,while pediatricians were the first parental choice for‘live’*** one-quarter of the parents informed their doctor about the information found *** of ten parents had a positive opinion of an official website managed by the doctors of our *** results mostly agreed with the international *** In conclusion,the establishment of official websites(designed and managed by specialists)that parents can access to receive appropriate health information is mandatory in the internet era.

关键词： Internet Child Health Mothers Fathers

Gastroenterology and liver disease during COVID-19 and in anticipation of post-COVID-19 era: Current practice and future directions

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World Journal of Clinical Cases 2021年第19期9卷 4918-4938页

作者： Katerina G oikonomou Panagiotis Papamichalis Tilemachos Zafeiridis maria Xanthoudaki Evangelia Papapostolou Asimina Valsamaki Konstantinos Bouliaris Michail Papamichalis Marios Karvouniaris Panagiotis J Vlachostergios Apostolia-Lemonia Skoura Apostolos Komnos Intensive Care Unit General Hospital of LarissaLarissa 41221ThessalyGreece Surgical Department General Hospital of LarissaLarissa 41221ThessalyGreece Department of Cardiology University Hospital of LarissaLarissa 41110ThessalyGreece Intensive Care Unit University Hospital of LarissaLarissa 41110ThessalyGreece Division of Hematology and Medical Oncology Department of MedicineWeill Cornell MedicineNew YorkNY 10065United States Transfusion Medicine Department University Hospital of LarissaLarissa 41110ThessalyGreece

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has emerged as a major threat to global public *** virus causes the clinical syndrome known as coronavirus disease 2019(COVID-19),in which multiple organs can get *** from manifestations of the respiratory system,which predominate,its clinical presentation is frequently accompanied by symptoms of the gastrointestinal(GI)tract and liver *** correlation of symptoms and abnormalities with disease severity is discussed,leading to ambiguous results from international ***,the disease infects patients with coexisting liver and GI disorders affecting both their health status and the availability of healthcare services provided to *** risk of transmission of the disease during aerosol-generating procedures has changed the diagnostic approach and follow-up algorithms for liver and GI *** the safety of both doctors and patients,telemedicine and distant evaluation have become everyday practice,whereas several routines and emergency visits at outpatient and emergency departments have been postponed or *** against SARS-CoV-2 is underway,providing hope to humanity and the expectation that the post-COVID-19 era is *** review aims to update knowledge about the manifestations of COVID-19 related to liver and GI diseases and the effect of the pandemic on the diagnostic and therapeutic procedures for these diseases with a special focus on how current practices have changed and what changes will possibly remain in the future.

关键词： COVID-19 SARS-CoV-2 Liver disease Gastroenterology practice Endoscopy

Effects of an active lifestyle on the physical frailty of liver transplant candidates

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World Journal of Transplantation 2022年第11期12卷 365-377页

作者： Ilias Marios oikonomou Emmanouil Sinakos Nikolaos Antoniadis Ioannis Goulis Olga Giouleme maria Anifanti Georgios Katsanos Konstantina-Eleni Karakasi Georgios Tsoulfas Evangelia Kouidi Department of Transplant Surgery Aristotle University of ThessalonikiThessaloniki 54642Greece The Fourth Department of Internal Medicine Aristotle University of ThessalonikiThessaloniki 54642Greece The Second Propaedeutic Department of Internal Medicine Aristotle University of ThessalonikiThessaloniki 54642Greece Laboratory of Sports Medicine Aristotle University of ThessalonikiThessaloniki 57001Greece

BACKGROUND Liver transplantation is the most important therapeutic intervention for end-stage liver disease(ELD).The prioritization of these patients is based on the model for end-stage liver disease(MELD),which can successfully predict short-term ***,despite its great validity and value,it cannot fully incorporate several comorbidities of liver disease,such as sarcopenia and physical frailty,variables that can sufficiently influence the survival of such ***,there is growing interest in the importance of physical frailty in regard to mortality in liver transplant candidates and recipients,as well as its role in improving their survival *** To evaluate the effects of an active lifestyle on physical frailty on liver transplant *** An observational study was performed within the facilities of the Department of Transplant Surgery of Aristotle University of *** liver transplant candidate patients from the waiting list of the department were included in the *** that were bedridden,had recent cardiovascular incidents,or had required inpatient treatment for more than 5 d in the last 6 mo were excluded from the *** following variables were evaluated:Activity level via the International Physical Activity Questionnaire(IPAQ);functional capacity via the 6-min walking test(6MWT)and cardiopulmonary exercise testing;and physical frailty via the Liver Frailty Index(LFI).RESULTS According to their responses in the IPAQ,patients were divided into the following two groups based on their activity level:Active group(A,10 patients);and sedentary group(S,10 patients).Comparing mean values of the recorded variables showed the following results:MELD(A:12.05±5.63 vs S:13.99±3.60;P>0.05);peak oxygen uptake(A:29.78±6.07 mL/kg/min vs S:18.11±3.39 mL/kg/min;P<0.001);anaerobic threshold(A:16.71±2.17 mL/kg/min vs S:13.96±1.45 mL/kg/min;P<0.01);6MWT(A:458.2±57.5 m vs S:324.7±55.8 m;P<0.001);and LFI(A:3.75±0.31 vs

关键词： Liver transplantation Frailty Six-minute walk test Cardiopulmonary exercise testing Exercise therapy Observational study