Jacobsson J, Carlson J, Reitan C, et al. - Researchers examined whether among cardiac resynchronization therapy (CRT) recipients, there exist correlations of interatrial block (IAB) and abnormal P-wave terminal force in lead V₁ (PTFV₁) with new-onset atrial fibrillation (AF) or death. This study involved CRT recipients (n = 210) with sinus rhythm ECG at CRT implantation and no AF history. Overall, 45% of all patients were found to have IAB. Among participants, IAB was shown to be related to new-onset AF and death, and it was inferred that IAB may aid risk stratification in the context of heart failure management. No prognostic value of abnormal PTFV₁ was identified.