Can Dispersion of the QT Interval Identify Inducible Monomorphic Versus Polymorphic Ventricular Tachycardia?

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Abstract
Background: Dispersion of QT interval has been utilized to stratify patients who may be at risk for lethal ventricular arrhythmias. This study attempted to evaluate the value of QT dispersion in patients undergoing electrophysiological studies (EPSs) to predict inducible monomorphic ventricular tachycardia (MVT) or polymorphic ventricular tachycardia or ventricular fibrillation (PMVT/VF).Methods: EPSs were performed on 33 patients with a history of symptomatic MVT and PMVT/VF. Seventeen patients were induced by EPS to MVT and 13 patients to PMVT/VF; three other patients could not be induced. The QT limb (QTL, QTCL), precordial (QTP, QTcP) and dispersion measurements, and limb (QTLd, QTcLd, JTLd) and precordial (QTpd, QTcPd, JTPd), were analyzed by two independent observers. Except for the QTP which appeared longer in patients with PMVT/VF than in patients with MVT (468 ± 124 vs 410 ± 41.8 ms, P < 0.05), there was no statistical difference between the QT, QTc, QTd, JTd and induced MVT vs PMVT/VF.Conclusion: Our data suggest that QT dispersion considering limb leads, precordial leads, or a combination of all leads did not predict inducible MVT vs PMVT/VF in patients presenting with serious index ventricular arrhythmias. A.N.E. 1998; 3(1):20–24