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Interatrial block (IA and abnormal P-wave terminal force in lead V1 (PTFV1) are electrocardiographic (ECG) abnormalities that have been shown to be associated with new-onset atrial fibrillation (AF) and death. However, their prognostic importance has not been proven in cardiac resynchronization therapy (CRT) recipients. To assess if IAB and abnormal PTFV1 are associated with new-onset AF or death in CRT recipients. CRT recipients with sinus rhythm ECG at CRT implantation and no AF history were included (n = 21. Automated analysis of