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Determinants of precordial QT dispersion in normal subjects
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Abstract: Dispersion of precordial QT intervals has been attributed to delay in the recovery process in the myocardium under the exploring electrode, a local effect. However, the phenomenon also could be explained by different projections of the heart vector, in which case the 12-lead electrocardiogram (ECG) derived from the heart vector would show similar dispersion that could not be local in nature because the electrical activity of the heart is represented by a single dipole. Using an analog device that switched between the two, conventional and derived ECGs were obtained from 129 normal ...
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Seasonal variability of the QT dispersion in healthy subjects
; ...studied the seasonal variability of QT dispersion in 25 healthy subjects, aged 36...confusion from the circadian rhythm of QT dispersion, subsequent ECGs were recorded within...minutes of the reference summer one. The QT dispersion was calculated as the difference between...
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Effects of cardiovascular autonomic function tests on QT dispersion in the 12-lead electrocardiogram of healthy patients
; ...cardiovascular autonomic reflexes affect QT dispersion, a suggested marker of arrhythmia risk...of QT-peak and QT-end intervals, and QT dispersion was defined as maximum-minimum of the...ms vs 35 - 21 ms, P < .05), but QT dispersion did not change during the other interventions...
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Right Lateral Decubitus Position Reduces QT Dispersion in Patients With Chronic Heart Failure
; Abstract: A greater QT dispersion in patients with chronic heart...arrhythmias. We evaluated whether QT dispersion in CHF patients is modified by...R)]. In normal subjects, the QT dispersion was comparable in the three recumbent...
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QT Dispersion in Adult Hypertensives
; Increased QT dispersion is associated with sudden cardiac...cardiac death. We examined whether QT dispersion, which is easily obtained from a...hypertension and 78 normotensives had QT dispersion measured manually from a surface...
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QT prolongation and dispersion in myocardial ischemia and infarction
; ...opportunity to detect transient changes of QT dispersion and correlate such changes with the...GUSTO I studies, serial changes of the QT dispersion were analyzed in an attempt to predict...least every 20 minutes. Measurements of QT dispersion were made at a median time of 2.37...
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Algorithms for computerized QT analysis
; ...discussed. Key words: T wave peak, QT dispersion analysis, principal component analysis...reports indicating the usefulness of QT dispersion for different clinical applications...pain (3-5). However, in those studies QT dispersion was, for the most part, measured manually...
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Why does not QT dispersion reflect the heterogeneity in ventricular repolarization?
; ...discrepancies exist in the feasibility of QT dispersion to represent the heterogeneity in ventricular...understand the relationship between QT dispersion and the heterogeneity in ventricular...of Q wave and the end of T wave, and QT dispersion was then calculated as the average...
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QT dispersion failed to estimate the global dispersion of ventricular repolarization measured using monophasic action potential mapping technique in swine and patients
; ...study was to evaluate whether the QT dispersion measured from 12-lead electrocardiogram...there was no significant difference in QT dispersion between these 2 subgroups. In conclusion, QT dispersion on the surface ECG could not estimate...
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Biological correlates of QT interval and QT dispersion in 2,265 patients with left ventricular ejection fraction <= 40%
; Abstract: Increased QT interval and QT dispersion have been associated with increased...LV ejection fraction (P < .0001) QT dispersion increased with increasing LV isovolumic...Prolongation of QT interval and increased QT dispersion are associated with increased mortality...
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Dynamic changes of QT interval and QT dispersion in non-Q-wave and Q-wave myocardial infarction
; Abstract: QT interval and QT dispersion both prolong early postinfarction...dynamic changes in QT interval and QT dispersion early postinfarction between...maximum QTc (QTc^sub max^) and QT dispersion (QTD) were measured during the...
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