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Standards for Reporting of the Thoracic Aorta on Computed Tomography and Magnetic Resonance ImagingViewing and measuring are best accomplished at a picture archiving and communications system workstation or an independent computer workstation, in which the aorta can be rotated into the best orientation to review each segment of the e282 Circulation

Copies: This document is available on the World Wide Web sites of the American College of Cardiology (www.acc.org), the American Heart Association (my.americanheart.org), and the Society for Cardiovascular Angiography and Interventions (scai.org). A copy of the document is also available at http://www.americanheart.org/presenter.jhtml?identifierϭ3003999 by selecting either the "topic list" link or the "chronological list" link (No. KJ-0734). To purchase additional reprints, call 843-216-2533 or e-mail kelle.ramsay@wolterskluwer.com.Expert peer review of AHA Scientific Statements is conducted at the AHA National Center. For more on AHA statements and guidelines development, visit http://www.americanheart.org/presenter.jhtml?identifierϭ3023366.Permissions: Multiple copies, modification, alteration, enhancement, and/or distribution of this document are not permitted without the express permission of the American Heart Association. Instructions for obtaining permission are located at http://www.americanheart.org/presenter.jhtml? identifierϭ4431. A link to the "Permission Request Form" appears on the right side of the page. STEMI and PCI Focused Updates PreambleA primary challenge in the development of clinical practice guidelines is keeping pace with the stream of new data on which recommendations are based. In an effort to respond promptly to new evidence, the American College of Cardiology Foundation/American Heart Association (ACCF/AHA) Task Force on Practice Guidelines has created a "focused update" process to revise the existing guideline recommendations that are affected by evolving data or opinion. Before the initiation of this focused approach, periodic updates and revisions of existing guidelines required up to 3 years to complete. Now, however, new evidence will be reviewed in an ongoing fashion to more efficiently respond to important science and treatment trends that could have a major impact on patient outcomes and quality of care. Evidence will be reviewed at least twice a year, and updates will be initiated on an as-needed basis as quickly as possible, while maintaining the rigorous methodology that the ACCF and AHA have developed during their 25 years of partnership.These updated guideline recommendations reflect a consensus of expert opinion after a thorough review primarily of late-breaking clinical trials identified through a broad-based vetting process as being important to the relevant patient population, as well as a review of other new data deemed to have an impact on patient care (see Section 1.1, Methodology and Evidence Review, for details). This focused update is not intended to represent an update based on a full literature review from the date of the previous guideline publication. Specific criteria/considerations for inclusion of new data include the following:• publication in a peer-reviewed journal;• large randomized, placebo-controlled trial(s);• nonrandomized data deemed important on the basis of results that affect current safety and efficacy assumptions; • strength/weakness of ...