Implantable Cardiac Monitors in High-Risk Post-Infarction Patients With Cardiac Autonomic Dysfunction

The majority of deaths after myocardial infarction occurs in patients with preserved left ventricular ejection fraction (\>35%) for whom no prophylactic strategies exist. Periodic Repolarization Dynamics (PRD) and Deceleration Capacity (DC) of heart rate are autonomic risk markers that identify a new high risk group of patients with LVEF 35-50% who have the same poor prognosis as patients with LVEF ≤35%. In SMART-MI, post-infarction patients with LVEF 35-50% and abnormal PRD and/or DC will be randomly assigned to biomonitoring-guided therapy or conventional follow-up.