نتایج جستجو برای: qtd
تعداد نتایج: 258 فیلتر نتایج به سال:
Background—Body-surface ECG measures (QT dispersion [QTd], QRST integrals) have been used as indices of myocardial repolarization abnormalities with the goal of identifying patients at risk of fatal arrhythmias. The clinical utility of these measures has been questioned. We investigate the complex relationship between epicardial and body-surface potentials in the context of regionally abnormal ...
The Quad Tree Decomposition based performance analysis of compressed image data communication for lossy and lossless through wireless sensor network is presented. Images have considerably higher storage requirement than text. While transmitting a multimedia content there is chance of the packets being dropped due to noise and interference. At the receiver end the packets that carry valuable inf...
Prolonged cardiac repolarization causes fatal cardiac arrhythmias. There is evidence that these contribute to sudden death associated with nocturnal hypoglycemia in young people with diabetes. We measured cardiac repolarization (QT interval [QTc] and QT dispersion [QTd]) during experimental hypoglycemia with and without beta-blockade and potassium infusion to establish possible mechanisms. Two ...
Introduction: QT dispersion (QT Max – QT min) reflects inhomogeneous ventricular depolarization that may provide a substrate for serious arrythmias and is associated with adverse clinical outcomes in patients with coronary artery disease. Some studies have shown reduction in QT dispersion after successful angioplasty due to coronary reperfusion, but effect of coronary artery bypass grafting o...
چکیده سابقه و هدف: با توجه به اهمیت شاخص ها و مارکرها برای فوریت های بیماری ها و اهمیت تشخیص سریع بیماری ها از جمله ( ischemic heart disease) ihd ، و تناقضهای موجود در مورد کمیت و کیفیت شاخص qtd در بیماران ihd، به منظور بررسی میزان qt dispersion استراحت و استرس در افراد غیر ایسکمیک و افراد ایسکمیک با شدت های مختلف، این تحقیق انجام شد. روش بررسی: تحقیق به روش مقطعی (cross sectional ) انجام شد. د...
BACKGROUND Coronary slow-flow (CSF) is an angiographic phenomenon characterised by delayed opacification of vessels in the absence of any evidence of obstructive epicardial coronary disease. QT interval dispersion (QTD) reflects regional variations in ventricular repolarisation and cardiac electrical instability and has been reported to be longer in patients with CSF. AIM To examine QT durati...
BACKGROUND AND OBJECTIVE The diagnostic value of ST-segment deviation detected by ambulatory electrocardiography (AECG) is controversial in identifying coronary artery disease (CAD) referred for coronary angiography (CAG). Recently, many parameters which evaluate CAD can be derived from AECG. Therefore, we aimed to investigate the diagnostic value of AECG in screening CAD referred for CAG when ...
OBJECTIVE To estimate the early prevalence of various electrocardiographic (EKG) abnormalities in patients with systemic lupus erythematosus (SLE) and to evaluate possible associations between repolarization changes (increased corrected QT [QTc] and QT dispersion [QTd]) and clinical and laboratory variables, including the anti-Ro/SSA level and specificity (52 or 60 kd). METHODS We studied adu...
OBJECTIVE The aim of our study was to evaluate the effect of cardiac resyncronization therapy (CRT) on QT dispersion (QTd), JT dispersion (JTd) and transmural dispersion of re-polarization (TDR), markers of heterogeneity of ventricular repolarization in a study population with severe heart failure. METHODS AND RESULTS Fifty patients (43 male, 7 female, aged 60.2 ± 3.1 years) suffering from co...
BACKGROUND In electrocardiography (ECG), QT is the interval between the onset of Q wave to the end of the T wave. This interval may be a sign of changes in the ventricular structure in hematologic disorders such as thalassemia major. OBJECTIVES The main goal of this study was to compare the diagnostic value of corrected QT dispersion (QTcd) and QT dispersion (QTd) with left ventricular mass (...
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