Jacobsson J, Carlson J, Reitan C, et al. - Researchers performed this study among cardiac resynchronization therapy (CRT) recipients, to determine whether interatrial block (IAB) and abnormal P-wave terminal force in lead V1 (PTFV1) are related to new-onset atrial fibrillation (AF) or mortality in these patients. Participants were 210 CRT recipients with sinus rhythm ECG at CRT implantation and no AF history. In this patient population, IAB was shown to be related to new-onset AF and death, and also was suggested to be valuable in assisting the risk stratification in the context of heart failure management. No prognostic value was displayed by abnormal PTFV1.