Management and Outcomes of Non-ST Elevation Acute Coronary Syndromes in Relation to Previous Use of Antianginal Therapies (from the Canadian Global Registry of Acute Coronary Events [GRACE] and Canadian Registry of Acute Coronary Events [CANRACE])

Study Questions:

What are temporal changes in the chronic use of antianginal therapy among patients presenting to the hospital with non–ST-segment elevation myocardial infarction (NSTEMI) or unstable angina (UA), and is pretreatment with antianginal therapy associated with differences in the clinical presentation, management, and outcomes of non–ST-segment elevation acute coronary syndrome (NSTE-ACS)?