CLINICAL STATEMENTS AND GUIDELINES Abdul R. Abdullah, MD, Science and Medicine Advisor Sam Shahid, MBBS, MPH, Associate Science and Medicine Advisor American Heart Association John J. Warner, MD, President Nancy Brown, Chief Executive Officer Rose Marie Robertson, MD, FAHA, Chief Science and Medicine Officer Gayle R. Whitman, PhD, RN, FAHA, FAAN, Senior Vice President, Office of Science Operations Prashant Nedungadi, PhD, Associate Science and Medicine Advisor, Office of Science Operations Jody Hundley, Production and Operations Manager, Scientific Publications, Office of Science Operations ARTICLE INFORMATION This document was approved by the American College of Cardiology Clinical Policy Approval Committee, the American Heart Association Science Advi- sory and Coordinating Committee, and the Heart Rhythm Society in Sep- tember 2017, and the American Heart Association Executive Committee in October 2017. The Comprehensive RWI Data Supplement table is available with this article at https://www.ahajournals.org/doi/suppl/10.1161/CIR.0000000000000549. A Data Supplement is available with this article at https://www.ahajournals. org/doi/suppl/10.1161/CIR.0000000000000549. This article has been copublished in the Journal of the American College of Cardiology and HeartRhythm. Copies: This document is available on the World Wide Web sites of the American College of Cardiology (www.acc.org), the American Heart Associa- tion (professional.heart.org), and the Heart Rhythm Society (www.hrsonline. org). A copy of the document is available at http://professional.heart.org/ statements by using either Search for Guidelines & Statements or the Browse by Topic area. To purchase additional reprints, call 843-216-2533 or e-mail kelle.ramsay@wolterskluwer.com. The expert peer review of AHA-commissioned documents (eg, scientific statements, clinical practice guidelines, systematic reviews) is conducted by the AHA Office of Science Operations. For more on AHA statements and guide- lines development, visit https://professional.heart.org/statements. Select the Guidelines & Statements drop-down menu near the top of the webpage, then click Publication Development. 