Cardiac tachyarrhythmias are the leading cause of morbidity and mortality in patients with repaired tetralogy of Fallot (TOF). We evaluated risk factors for sustained ventricular tachyarrhythmia (VT) and atrial tachyarrhythmia (ATA) in these patients. Patients (n?=?319) who underwent cardiac magnetic resonance (CMR) imaging at two tertiary centers between 2007 and 2016 were assessed. Potential risk markers, based on history, cardiac magnetic resonance imaging (CMR), electrocardiography (ECG) and echocardiography, were analyzed for prediction of the primary endpoint of VT, and the secondary endpoint of ATA. During a follow-up of 3.5 (0.9-6.1) years, 20 (6.3%) patients reached the primary endpoint, and 30 (9.4%) the secondary endpoint. Multivariable cox hazards regression identified right ventricular (RV) end-diastolic volume (Hazard ratio [HR] 2.03, per 10 ml/m2 increase; p?=?0.02), RV end-systolic volume (HR 3.04, per 10 ml/m2 increase; p?=?0.04), RV mass (HR 1.88, per 10 g/m2 increase; p?=?0.02), and RV ejection fraction (HR 6.06, per 10% decrease; p?=?0.02) derived from CMR to be independent risk factors of VT. In addition, QRS-duration (HR 1.70, per 10 ms increase; p?=?0.001) and body mass index (BMI: HR 1.8, per 5 kg/m2 increase; p?=?0.02) were independent markers of VT. Older age at TOF repair (HR 1.33, per 2 months increase; p?=?0.03) and BMI (HR 1.76, per 5 kg/m2 increase; p?
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