[Variations between 2 ECG as predictors of atrial fibrillation: Cohort study].

Objetive: To evaluate the association between delta variations in the parameters of 2 sinusal ECG with atrial fibrillation (AF) onset.

Method: Retrospective cohort of 9,975 adult patients and members of the prepaid system at Hospital Italiano de Buenos Aires from Argentina, who had at least 2 sinusal ECG between 2006 and 2011. Population was followed up for detection of AF.