Georgios Vayonas

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BACKGROUND Bacterial contamination of treated water and dialysate comprises an important problem for patients undergoing haemodialysis. Both the progressive reduction of the thickness of cellulose membranes and the expanding use of high-flux membranes probably enhance the risk of pyrogenic reactions, therefore increasing the need for atoxic water and(More)
The counts of yeasts and filamentous fungi were investigated in the municipal water supplies of haemodialysis centres, in the treated water and the dialysate from all 85 haemodialysis units in Greece, in order to estimate their occurrence, their correlation with contamination indicator bacteria and other influencing factors. Filamentous fungi and yeasts(More)
BACKGROUND Patients on regular hemodialysis treatment are in an immunodeficiency state. Several studies have shown defective T cell proliferation after stimulation with various agents. Staphylococcal enterotoxin B (SEB) is a MHC-dependent superantigen that triggers proliferation of a large proportion of T cells. T cell activation after stimulation with SEB(More)
BACKGROUND Cardiovascular disease is the leading cause of death in hemodialysis (HD) patients. Coronary artery calcification (CAC) is considered a marker of atherosclerosis and coronary artery disease (CAD). The CAC progression and factors that influence it were evaluated during a 30-month period. METHODS Forty HD patients without a history of CAD were(More)
BACKGROUND We evaluated the value of coronary artery calcification (CAC) score in coronary artery disease (CAD) detection in asymptomatic hemodialysis (HD) patients by evaluating the association among CAC score, exercise electrocardiography (EECG), and Thallium-201 dipyridamole scintigraphy. Correlation between aortic pulse wave velocity (PWV) and CAC score(More)
BACKGROUND/AIM Decreased sensitivity to the hypoglycaemic action of insulin is an almost universal phenomenon in uraemic patients, and it is attributed either to uraemic toxins or to anaemia or even to secondary hyperparathyroidism. Considering the conflicting data of few existing studies, we examined the influence of erythropoietin (EPO) treatment on(More)
OBJECTIVE We administered pyrazinamide (PZA) and probenecid (PB) --two well-known modulators of urate transport via the proximal tubules - to evaluate their impact on urate transport through the peritoneal membrane and to clarify mechanisms affecting peritoneal transport. SETTING A continuous ambulatory peritoneal dialysis (CAPD) unit in 2nd Hospital of(More)
In order to evaluate the influence of diabetes mellitus on peritoneal membrane permeability, we studied the peritoneal protein loss in two groups of patients. Group A consisted of 16 patients (9 nondiabetics and 7 diabetics) who were in the first month of treatment on continuous ambulatory peritoneal dialysis (CAPD). Group B consisted of 13 patients (7(More)