In the article by Stone, “Angioplasty Strategies in ST-Segment Elevation Myocardial Infarction: Part I: Primary Percutaneous Coronary Intervention,” which appeared in the July 29, 2008, issue of the journal (Circulation. 2009;118:538-551), the following change should be made: On page 544, right column, in the sentence that begins, “Compared with clopidogrel, prasugrel resulted in a 12.1% reduction in the primary end point of cardiovascular death, nonfatal myocardial infarction, or nonfatal stroke,….” “12.1%” should be replaced by “19%.” This change has been made to the current online version of the article. The author regrets the error.