Computerized QT dispersion measurement and cardiovascular mortality in male veterans

Shah, Bimal R.; Yamazaki, Takuya; Engel, Gregory; Cho, Shaun; Chun, Sung; Froelicher, Victor

doi:10.1016/j.amjcard.2003.10.051

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…Like as other studies, the results of this study questioned the sole arrhythmogenic role of QTd. 7,12 The differences between intrinsic and simultaneous Biv pacing in terms of Tp-e interval in patients with and without SVAs were not significant. Other studies showed that Tp-e has no role in arrhythmogenesis3 or have reported the protective effects of longer Tp-e intervals, 8 which are consistent with the present study results.…”

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confidence: 81%

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Role of QT dispersion and Tp-e interval after biventricular pacing in the incidence of sustained ventricular arrhythmias in patients with implanted cardiac resynchronization therapy device

Akbarzadeh¹,

Ataeye²,

Kazemi³

et al. 2017

J Anal Res Clin Med

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CardiacResynchronization Therapy, Heart Failure, Cardiac ArrhythmiasQT dispersion (QTd) and Tp-e interval show controversial results in incidence of sustained ventricular arrhythmias (SVA) in patients with heart failure (HF). In patients with implanted cardiac resynchronization therapy (CRT) device, there is a unique opportunity to record SVAs. The aim of this study was to evaluate the effects of QTd and Tp-e interval on the incidence of SVAs after simultaneous biventricular (Biv) pacing.In the present study, 31 consecutive patients with advanced HF and implanted CRT device were evaluated one year for possible SVAs, corrected QT (QTc), QTd, and Tp-e interval. Patients were divided into two groups; with (group 1) and without (group 2) SVAs.Among the studied patients, 5 (16%) experienced SVAs. The intrinsic and Biv pacing QTd were 70.74 ± 18.00 and 89.26 ± 28.00 msec, and 95.09 ± 44 and 88.09 ± 33 msec in group 1 and group 2, respectively (P = 0.18 and P = 0.16, respectively). Tp-e was not different between the two groups. In group 1, QTc increased from 438.83 ± 64 msec to 488.24 ± 48 msec (P = 0.13), and in group 2, it decreased from 499.70 ± 65.00 msec to 480.00 ± 31.00 msec after simultaneous Biv pacing (P = 0.13).QTd, Tp-e, and QTc did not differ significantly after Biv pacing to show any positive effect on the incidence of SVAs in part due to the severity of changes which already occur in patients with advanced HF. QTc, QTd, and Tp-e showed little changes after Biv pacing and probably do not have a significant role in the incidence of SVAs.Citation: Akbarzadeh F, Ataeyeh S, Kazemi B, Akbarzadeh A, Safaei N. Role of QT dispersion and Tp-e interval after biventricular pacing in the incidence of sustained ventricular arrhythmias in patients with implanted cardiac resynchronization therapy device.

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confidence: 81%

“…On the other hand, some studies have questioned the strong effect of QTd on the genesis of cardiac arrhythmias. 7 Furthermore, a study on the prognostic effect of Tp-e on cardiovascular mortality showed conflicting results; 8 thus, the role of these electrophysiological factors on arrhythmogenesis in patients with HF requires greater attention.…”

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confidence: 99%

Role of QT dispersion and Tp-e interval after biventricular pacing in the incidence of sustained ventricular arrhythmias in patients with implanted cardiac resynchronization therapy device

Akbarzadeh¹,

Ataeye²,

Kazemi³

et al. 2017

J Anal Res Clin Med

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“…Small studies have suggested that prolonged Tp-e may be associated with future ventricular arrhythmias in patients undergoing electrophysiology studies (28) and those with bradycardia (29), although other studies in cardiovascular disease populations have shown no difference (30) or a shorter Tp-e (31) in those with an adverse outcome than in survivors. Similarly, although some studies have shown QTd to predict cardiovascular mortality in population studies (32), other studies have not (30,33).…”

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confidence: 96%

Air Pollution and Repolarization Heterogeneity

Lampert

2011

Journal of the American College of Cardiology

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“…Examining the QT dispersion for predictability of cardiovascular mortality, Shah et al . [ 4 ] assumed that discrepancies among the studies may be explained by the difficulty in obtaining accurate and reproducible measures of QT intervals. Malik and Batchvarov [ 5 ] also paid attention to methodological difficulties in the measurement of the QT interval.…”

Section: Introductionmentioning

confidence: 99%

Dataset of manually measured QT intervals in the electrocardiogram

et al. 2006

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Background: The QT interval and the QT dispersion are currently a subject of considerable interest. Cardiac repolarization delay is known to favor the development of arrhythmias. The QT dispersion, defined as the difference between the longest and the shortest QT intervals or as the standard deviation of the QT duration in the 12-lead ECG is assumed to be reliable predictor of cardiovascular mortality.

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Computerized QT dispersion measurement and cardiovascular mortality in male veterans

Cited by 7 publications

References 16 publications

Role of QT dispersion and Tp-e interval after biventricular pacing in the incidence of sustained ventricular arrhythmias in patients with implanted cardiac resynchronization therapy device

Role of QT dispersion and Tp-e interval after biventricular pacing in the incidence of sustained ventricular arrhythmias in patients with implanted cardiac resynchronization therapy device

Air Pollution and Repolarization Heterogeneity

Dataset of manually measured QT intervals in the electrocardiogram

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