Key result
QRS duration on vectorcardiogram ≥110 ms and conventional ECG ≥100 ms predicted an abnormal signal-averaged ECG with sensitivities of 93% and 77% and specificities of 83% and 85%, respectively.
Why the study?
Do different methods of measuring QRS duration correlate with the presence of spontaneous and inducible ventricular tachycardia in patients with prior myocardial infarction?
Population
121 consecutive patients with prior myocardial infarction, studied either for spontaneous ventricular…
Comparison
QRS duration measurement using signal-averaged… vs QRS duration measurement using conventional 12…
Design
Cross-sectional
Authors
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May support post-MI VT risk stratification via ECG/VCG QRS thresholds; leaves open prospective validation against clinical events.
Observational (n=121)
Do different methods of measuring QRS duration correlate with the presence of spontaneous and inducible ventricular tachycardia in patients with prior myocardial infarction?
p-value: p=<0.001
Measurement of QRS duration with conventional ECG, VCG, or signal-averaged ECG can help identify patients with prior myocardial infarction who are prone to ventricular tachycardia.
Béatrice Brembilla-Perrot (1994) conducted an observational in Myocardial infarction (n=121). Signal-averaged ECG and Frank vectorcardiogram vs. Conventional 12-lead ECG was evaluated on QRS duration (p=<0.001). QRS duration on vectorcardiogram ≥110 ms and conventional ECG ≥100 ms predicted an abnormal signal-averaged ECG with sensitivities of 93% and 77% and specificities of 83% and 85%, respectively.
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