Literature Review The practice guidelines and other clinical guidance documents that provided the basis for these measures can be seen in Table 3. 2.4. Definition and Selection of Measures The writing committee reviewed both recent guidelines and other clinical guidance documents, such as the ACCF/SCAI/ STS/AATS/AHA/ASNC/HFSA/SCCT 2012 Appropriate Use Criteria for Coronary Revascularization .11 The writing com- mittee also examined available information on gaps in care and the clinical epidemiology of PCI. All measures were designed to assess quality of care in patients undergoing PCI across a variety of ambulatory and hospital settings to support achievement of the desirable out- comes identified. The measures also were designed to allow for the exclusion of patients with contraindications or other valid reasons for exclusion from the measure. In defining the measure exceptions, the writing committee was guided by the AMA- PCPI Recommendations for Specification and Categorization of Measure Exclusions,13 as discussed further below. The writing committee evaluated the potential measures against the ACC/AHA attributes of performance measures (Table 4) to reach consensus on which measures should be advanced for inclusion in the final measure set; the Summary Analysis Table (Appendix C) captures this evaluation process. After the peer review and public comment period, the writing committee reviewed and discussed the comments received, and further refinements were made in the measure set. Percutaneous Coronary Intervention Measures 3.1. Target Population and Care Period The target population for the measures consists of all patients undergoing PCI for coronary artery disease. That said, a large focus of the writing committee was on measures aimed at patients coming to the cardiac catheterization laboratory for elective procedures that is, those originating as outpa- tients. Patients arriving from the inpatient setting or emer- gency department and those with acute coronary syndromes were considered secondarily. 