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Hyperthyroidism is associated with lengthening of ventricular repolarization
Clinical Endocrinology, 2001OBJECTIVELengthened ventricular repolarization, as assessed by the QT interval on electrocardiogram (ECG), can predispose to an increased risk of cardiac dysrhythmias; no data are available on QT corrected for heart rate (QTc) in hyperthyroidismin vivo.DESIGNQT and RR intervals from 24 h ambulatory ECG Holter recording were measured in patients with ...
Colzani RM +5 more
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Evaluation of Ventricular Repolarization
2003The aim of this chapter is to review the methods used to study cardiac repolarization impairment in the clinical setting. The bewildering variety of available techniques testifies to the complexity of ventricular repolarization and to the fact that no fully satisfactory method is currently available.
Jan Nĕmec +2 more
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Obesity and Ventricular Repolarization: a Comprehensive Review
Progress in Cardiovascular Diseases, 2018Obesity is known to be a strong predictor of sudden cardiac death. For this reason, concern exists that this association may be related to delayed ventricular repolarization (VR), which has been extensively studied in overweight and obese patients.
Jad, Omran +3 more
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Effects of cisapride on ventricular repolarization in children
Acta Paediatrica, 2000Life-threatening ventricular dysrhythmias mainly attributed to QTc prolongation have been reported in adults and children who were using cisapride, a prokinetic agent that facilitates gastrointestinal motility. Recent adult and paediatric case reports have suggested an association of malignant ventricular dysrhythmias with administration of cisapride ...
H E, Tutar +5 more
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Effects of propranolol on ventricular repolarization in man
European Journal of Clinical Pharmacology, 1990The acute effects on monophasic action potentials (MAP), QT interval, and right ventricle effective refractory period (V-ERP) of propranolol 0.2 mg.kg-1 body weight have been studied in 10 patients with coronary artery disease. The median duration of MAP at 90% repolarization (MAP90) was shortened from 238 to 228 ms at a constant paced heart rate of ...
K, Endresen, J P, Amlie
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Development of Drugs That Alter Ventricular Repolarization
American Journal of Therapeutics, 2002Many drugs are found to alter ventricular repolarization, as manifest by T-wave and U-wave changes on the surface electrocardiogram. These changes have frequently been associated with malignant ventricular arrhythmias. There is no perfectly sensitive and specific way of anticipating such arrhythmias, but some clinical and preclinical screening methods ...
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Dispersion of Ventricular Repolarization in the Voltage Domain
Pacing and Clinical Electrophysiology, 1998Dispersion of ventricular repolarization, assessed as QT dispersion in the ECG or by multiple monophasic action potential (MAP) recordings, is defined as the difference between the earliest and latest repolarization. It is thus measured in the time domain. However, myocardial refractoriness is primarily a function of the membrane potential during phase
S, Behrens +3 more
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The Impact of Hemodialysis on the Dispersion of Ventricular Repolarization
Pacing and Clinical Electrophysiology, 2013BackgroundSudden cardiac death is prevalent in chronic hemodialysis (HD) patients while the dialysis process may have arrhythmogenic potential. We sought to examine the effect of HD on conventional electrocardiographic parameters as well as on novel indexes of repolarization, given that increased spatial dispersion of repolarization is related to ...
Kallirroi, Kalantzi +8 more
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Archives des maladies du coeur et des vaisseaux, 1992
Ventricular repolarisation is the period that depolarised cells require to become polarised, that is to say excitable. In general cardiological practice, the duration of repolarisation is assessed by measuring the QT interval on the surface electrocardiogram.
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Ventricular repolarisation is the period that depolarised cells require to become polarised, that is to say excitable. In general cardiological practice, the duration of repolarisation is assessed by measuring the QT interval on the surface electrocardiogram.
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Ischemia, Heart Rate, and Ventricular Repolarization
Journal of Cardiovascular Electrophysiology, 2000George Ralph Mines was probably the first to note that, after an abrupt change in heart rate, several beats were needed before the ECG attained a constant form. He considered this an interesting example of how “the previous history of the tissue may influence its immediate behaviour.”1 Later studies confirmed that the heart has a long “memory,” that ...
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