Ertan Yetkin

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Calcific aortic stenosis is the most common cause of aortic valve replacement in developed countries, and this condition increases in prevalence with advancing age. The fibrotic thickening and calcification are common eventual endpoint in both non-rheumatic calcific and rheumatic aortic stenoses. New observations in human aortic valves support the(More)
Neurohormones (NHs) in the cascade of the arginine vasopressin (AVP) system have drawn particular attention in the recent years. Copeptin, the C-terminal portion of provasopressin, is a novel NH of the AVP system, and is known to be co-released with AVP from hypothalamus (neurohypophysis). As a surrogate marker of the AVP system, copeptin has gradually(More)
BACKGROUND The development of coronary collateral vessels is the physiological response of myocardial tissue to hypoxia or ischemia, which results in an increase in blood supply to the tissue. However, a lack of collateral vessels or the presence of poor collateralization in some patients despite the presence of significant coronary stenosis or obstruction(More)
BACKGROUND It has been known that in a migraine attack intracranial and extracranial arteries on the headache side dilate and when the migraine attack has subsided, the intracranial arteries show segmental narrowing. We hypothesized that patients with migraine had an underlying systemic vasomotion abnormality and there might be an increased nitrate-mediated(More)
The procoagulant and prothrombotic states in patients with chronic atrial fibrillation are higher than those in patients with normal sinus rhythm. Mean platelet volume (MPV) which is a marker of platelet function and activation can reflect changes either in the level of platelet stimulation or the rate of platelet production. In this study, we aimed to(More)
BACKGROUND Slow coronary flow (SCF) in a normal coronary angiogram is a well-recognized clinical entity, but its etiopathogenesis remains unclear. DESIGN The aim of the study was to determine endothelial function in patients with SCF using a flow-mediated dilatation (FMD) technique in the brachial artery. METHODS Coronary flow was quantified using the(More)
OBJECTIVES The electromagnetic field generated by different systems have well-recognized adverse effects on pacemaker functions. The aim of this study is to evaluate the adverse effects of mobile phones on pacemaker functions. METHODS AND RESULTS A total of 679 patients with permanent pacemakers were enrolled in this study. The study was performed in two(More)
BACKGROUND Endothelium plays an important role in regulating coronary vascular tone. In addition, several of cardiovascular risk factors that are associated metabolic syndrome have been reported to be associated with endothelial dysfunction. In the present study we aimed to evaluate the coronary blood flow in patients with metabolic syndrome by means of the(More)
Chronic renal failure patients on maintenance hemodialysis (HD) have a number of ECG abnormalities and cardiac arrhythmias. Clinical and experimental data have shown that increased QT dispersion is associated with severe ventricular arrhythmias and sudden cardiac death. Therefore, the aim of this study was to investigate whether the uremic patients(More)