What question did this study set out to answer?

The study aims to compare QT dispersion in sinus beats and ventricular extrasystoles to evaluate its potential as a measure of recovery time dispersion.

January 1, 1992HeartOpen Access

QT dispersion in sinus beats and ventricular extrasystoles in normal hearts.

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Why the study?

Does QT dispersion differ between ventricular extrasystoles and sinus beats in patients with normal hearts?

Population

9 patients undergoing electrophysiological study for investigation of palpitation, found to have…

Comparison

Ventricular extrasystoles induced by programmed… vs Preceding and following sinus complexes

Design

Cross-sectional

Authors

CDChristopher P. DayUniversity Hospitals of North Midlands NHS Trust JMJanet M. McCombNewcastle upon Tyne Hospitals NHS Foundation Trust RCR. W. F. CampbellAllegheny Health Network

Discussion

Member takes

Implication

Supports QT dispersion as recovery dispersion marker in extrasystoles; hypothesis-generating for arrhythmia risk stratification.

Key Points

The study aims to compare QT dispersion in sinus beats and ventricular extrasystoles to evaluate its potential as a measure of recovery time dispersion.
Simultaneous electrocardiograms recorded at 50 mm/s during sinus rhythm and ventricular extrasystoles
QT dispersion calculated for sinus and extrasystolic beats, adjusted for the number of measurable leads
Nine patients with normal ventricles undergoing electrophysiological studies
Adjusted QT dispersion was significantly greater in ventricular extrasystoles compared to preceding and following sinus complexes
For the 350 ms coupling interval, adjusted QT dispersion difference was 52 to 78 ms and 56 to 82 ms (p<0.00001)
No correlation was found between coupling interval and adjusted QT dispersion magnitude

Structured PICO

Does QT dispersion differ between ventricular extrasystoles and sinus beats in patients with normal hearts?

Population

9 patients undergoing electrophysiological study for investigation of palpitation, found to have electrically normal ventricles.

Intervention

Ventricular extrasystoles induced by programmed right ventricular stimulation at different coupling intervals

Comparator

Preceding and following sinus complexes

Outcome

Adjusted QT dispersion (QT dispersion / square root of the number of measurable leads)surrogate

QT dispersion is significantly greater in ventricular extrasystoles compared to sinus beats, supporting the hypothesis that QT dispersion reflects regional variation in ventricular recovery.

Cite This Study

Day et al. (1992) studied this question.

synapsesocial.com/papers/6a70620df44fa9f079de030d https://doi.org/10.1136/hrt.67.1.39

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QT dispersion in sinus beats and ventricular extrasystoles in normal hearts.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

QT dispersion in sinus beats and ventricular extrasystoles in normal hearts.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider