Authors and peer reviewers RWI pertinent to this guideline are disclosed in Appendixes 1 and 2, respectively. Additionally, to ensure complete transparency, writing committee members compre- hensive disclosure information including RWI not pertinent to this document is available as an online supplement. Comprehensive disclosure information for the Task Force is also available online at www.cardiosource.org/ACC/About-ACC/ Leadership/Guidelines-and-Documents-Task-Forces.aspx. The work of the writing committee was supported exclusively by the ACCF, AHA, and the Society for Cardiovascular Angiography and Interventions (SCAI) without commercial support. Writing com- mittee members volunteered their time for this activity. In an effort to maintain relevance at the point of care for practicing physicians, the Task Force continues to oversee an ongoing process improvement initiative. As a result, in response to pilot projects, several changes to these guidelines will be apparent, including limited narrative text, a focus on summary and evidence tables (with references linked to abstracts in PubMed) and more liberal use of summary recommendation tables (with references that support LOE) to serve as a quick reference. In April 2011, the Institute of Medicine released 2 reports: Finding What Works in Health Care: Standards for System- atic Reviews and Clinical Practice Guidelines We Can Trust.2,3 It is noteworthy that the ACCF/AHA guidelines were cited as being compliant with many of the standards that were proposed. A thorough review of these reports and of our current methodology is under way, with further enhance- ments anticipated. The recommendations in this guideline are considered current until they are superseded by a focused update or the full-text guideline is revised. Guidelines are official policy of both the ACCF and AHA. Alice K. Jacobs, MD, FACC, FAHA, Chair ACCF/AHA Task Force on Practice Guidelines 1.1. Methodology and Evidence Review The recommendations listed in this document are, whenever possible, evidence based. 