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• W2122164920 abstract "Objective To assess the effect of pulmonary valve replacement (PVR) on the repolarization of patients with tetralogy of Fallot. Background Pulmonary valve regurgitation may cause right ventricular failure in adult patients with Fallot's tetralogy. In these patients, prolonged depolarization and disturbed repolarization are associated with ventricular arrhythmias and sudden cardiac death. Methods Thirty Fallot patients (age 32±9 years, 19 male) eligible for PVR were studied with cardiac magnetic resonance imaging (CMR) before and 6 months after PVR. Electrocardiograms obtained during initial and follow-up CMR were analyzed and occurrence of ventricular arrhythmias was studied. Results Right ventricular end-diastolic volume (RV EDV) decreased from 322±87 to 215±57 ml after PVR (P<0.0001). The spatial QRS-T angle normalized from 117±34 to 100±35°, P=0.0004 (normal angle <105°). QT dispersion and T-wave complexity did not change significantly. T-wave amplitude decreased from 376±121 to 329±100 μV (P=0.01). T-wave area decreased from 43±15 to 38±13 μV s (P=0.02). Decreases in T-wave amplitude and area were most prominent in the right precordial leads overlying the RV. Three patients had sustained ventricular arrhythmias and one patient died suddenly. These patients had a QRS duration >160 ms. No severe ventricular arrhythmias were found in patients with a RV EDV <220 ml, QRS-T angle <100°, QT dispersion <60 ms or T-wave complexity <0.30. Conclusion Normal repolarization indices may be associated with the absence of severe ventricular arrhythmias. PVR in Fallot patients with dilated right ventricles has a beneficial effect on electrocardiographic indices of repolarization heterogeneity." @default.
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• W2122164920 date "2008-03-01" @default.
• W2122164920 modified "2023-10-15" @default.
• W2122164920 title "Pulmonary valve replacement in tetralogy of Fallot improves the repolarization" @default.
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• W2122164920 doi "https://doi.org/10.1016/j.ijcard.2007.02.006" @default.
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