Short-long-short sequences (SLSS), related to atrial ectopic beats (AEBs), predict the recurrence of atrial fibrillation (AF) in some clinical situations. We investigated whether SLSS predict the occurrence of AF in acute phase of inferior myocardial infarction (MI). In patients who developed AF AEBs were more frequent. We concluded that the presence of frequent SLSS could be predictors or preceding factors of the occurrence of AF in acute inferior MI. (c) 2007 Elsevier Ireland Ltd. All rights reserved.