نتایج جستجو برای: long qt syndrome
تعداد نتایج: 1359864 فیلتر نتایج به سال:
Background—Defects of the SCN5A gene encoding the cardiac sodium channel are associated with both the LQT3 subtype of long-QT syndrome and Brugada syndrome (BS). The typical manifestations of long-QT syndrome (QT interval prolongation) and BS (ST segment elevation in leads V1 through V3) may coexist in the same patients, which raises questions about the actual differences between LQT3 and BS. I...
BACKGROUND Congenital long-QT syndrome (LQTS) is caused by mutations of genes encoding the slow component of the delayed rectifier current (LQT1, LQT5), the rapid component of the delayed rectifier current (LQT2, LQT6), or the Na(+) current (LQT3), resulting in ST-T-wave abnormalities on the ECG. This study evaluated the spectrum of ST-T-wave patterns and repolarization parameters by genotype a...
Clinicians are well aware that responses to QT-prolonging drugs vary among individuals.1 A drug dose (and concentration) that produces minimal QT prolongation in one patient may, in an apparently indistinguishable subject, produce marked QT prolongation and torsade de pointes. This variability in response to an exogenous stressor is paralleled by variability in the extent to which a given mutat...
A novel fully automated method for wave identification and extraction from electrocardiogram (ECG) waveforms is presented. This approach implements the combined use of a new machine-learning algorithm and of specified parameterized functions called Gaussian mesa functions (GMFs). Individual cardiac cycle waveforms are broken up into GMFs using a generalized orthogonal forward regression algorit...
3 List of original publications 8 Abbreviations 9
Results: BAI scores (26.6 ± 11.8 vs. 3.4 ± 3.3, p< 0.001) and BDI scores (12.6 ± 4 vs. 3.7 ± 4.5, p< 0.001) were signifi cantly higher in the patient group compared to the controls. P wave dispersion (Pd) [50.0 ± 17.5 miliseconds (ms) vs. 23.4 ± 7.7 ms, p< 0.001] and mean QT dispersion (QTd) (50.5 ± 18.1 ms vs. 28.3 ± 11.4 ms, p< 0.001) signifi cantly increased in the GAD patient group compared...
BACKGROUND Accurate and precise QT interval measurement is very important for both regulatory and drug developmental decision making. These measurements are often made using a manual or semi-automated technique, and the associated variability necessitates sample sizes of around 50 to 70 subjects in thorough QT/QTc studies. The purpose of this study was to compare the reproducibility and precisi...
A 7-year-old boy presented at our hospital with syncope. At birth, electrocardiography had shown a long QT interval with torsade de pointes (TdP). Congenital long QT syndrome (LQTS) had been diagnosed by genetic testing, and was successfully controlled with oral propranolol. At age 7, TdP had recurred with syncope. Electrocardiography revealed a prominent long QT interval with T-wave alternans....
AIMS Torsades de pointes arrhythmias (TdP) occur by definition in the setting of prolonged QT intervals. Animal models of drug induced Long-QT syndrome (dLQTS) have shown higher predictive value for proarrhythmia with beat-to-beat variability of repolarization duration (BVR) when compared with QT intervals. Here, we evaluate variability of QT intervals in patients with a history of drug-induced...
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