QT Dispersion Has No Prognostic Information for Patients With Advanced Congestive Heart Failure and Reduced Left Ventricular Systolic Function

Abstract

QT dispersion has no prognostic value regarding all-cause mortality, cardiac mortality, or cardiac arrhythmic mortality for patients with advanced CHF and reduced left ventricular systolic function.

Is abnormal myocardial repolarization associated with the occurrence of malignant tachyarrhythmias in Takotsubo cardiomyopathy?

“…The QT intervals in each of the 12 leads were measured from the beginning of the QRS complex to the visual return of the T-wave to the isoelectric line for every patient. Where the T-wave was complicated by a U-wave, the end of the T-wave was defined as the nadir between the T-and U-wave [11]. T-waves smaller than 1 mm in amplitude were not measured.…”

QT Dispersion Correlates with Systolic Rather than Diastolic Parameters in Patients Receiving Anthracycline Treatment

“…QT dispersion was measured from the initial deflection of the QRS complex to the point at which a tangent, drawn to the steepest portion of the terminal part of the T wave, crossed the isoelectric line (17). When a T wave was interrupted by a U wave, the end of the T wave was defined as the nadir between the T and the U waves (18). When the end of the T wave could not be identified, the QT interval was not measured.…”

Predicting Sudden Death Risk for Heart Failure Patients in the Implantable Cardioverter-Defibrillator Age

“…16 Dispersion of the QT interval in the surface ECG was initially associated with high-risk patients, but was of no value in a prospective study of 703 patients. 17 Detection of small oscillations in the T-wave amplitude (T-wave alternans) during exercise is linked to susceptibility to ventricular arrhythmias. 12 It is associated with high-risk groups and was a marker of risk in a prospective study of 85 patients with nonischemic cardiomyopathy.…”