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The American College of Cardiology, Society for Cardiovascular Angiography and Interventions, Society of Thoracic Surgeons, and American Association for Thoracic Surgery, along with key specialty and subspecialty societies, have completed a 2-part revision of the appropriate use criteria (AUC) for coronary revascularization. In prior coronary revascularization AUC documents, indications for revascularization in acute coronary syndromes (ACS) and stable ischemic heart disease were combined into 1 document. To address the expanding clinical indications for coronary revascularization, and in an effort to align the subject matter with the most current American College of Cardiology/American Heart Association guidelines, the new AUC for coronary artery revascularization were separated into 2 documents addressing ACS and stable ischemic heart disease individually. This document presents the AUC for ACS. Clinical scenarios were developed to mimic patient presentations encountered in everyday practice and included information on symptom status, presence of clinical instability or ongoing ischemic symptoms, prior reperfusion therapy, risk level as assessed by noninvasive testing, fractional flow reserve testing, and coronary anatomy. This update provides a reassessment of clinical scenarios that the writing group felt to be affected by significant changes in the medical literature or gaps from prior criteria. The methodology used in this update is similar to the initial document but employs the recent modifications in the methods for developing AUC, most notably, alterations in the nomenclature for appropriate use categorization. A separate, independent rating panel scored the clinical scenarios on a scale of 1 to 9. Scores of 7 to 9 indicate that revascularization is considered appropriate for the clinical scenario presented. Scores of 1 to 3 indicate that revascularization is considered rarely appropriate for the clinical scenario, whereas scores in the mid-range (4 to 6) indicate that coronary revascularization may be appropriate for the clinical scenario. Seventeen clinical scenarios were developed by a writing committee and scored by the rating panel: 10 were identified as appropriate, 6 as may be appropriate, and 1 as rarely appropriate. As seen with the prior coronary revascularization AUC, revascularization in clinical scenarios with ST-segment elevation myocardial infarction and non-ST-segment elevation myocardial infarction were considered appropriate. Likewise, clinical scenarios with unstable angina and intermediate- or high-risk features were deemed appropriate. Additionally, the management of nonculprit artery disease and the timing of revascularization are now also rated. The primary objective of the AUC is to provide a framework for the assessment of practice patterns that will hopefully improve physician decision making.