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Chronic right ventricular volume overload after tetralogy of Fallot repair is related to diastolic function and correlated with QRS prolongation. The risk of symptomatic arrhythmia is high when marked right ventricular enlargement and QRS prolongation develop. A QRS duration on the resting ECG of > or = 180 milliseconds is the most sensitive predictor of life-threatening ventricular arrhythmias yet described.
Gatzoulis et al. (Sat,) studied this question.
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