Original Title: Early Intravenous Beta-Blockers in Patients with ST-Segment Elevation Myocardial Infarction before Primary Percutaneous Coronary Intervention. Reference: Roolvink V et al. J Am Coll Cardiol. 2016 Jun 14;67(23):2705-15.   The impact of endovenous beta-blockers before primary PCI has not been established yet. This is the first double blind multicenter trial, controlled with placebo, to…