Enhancing Cardiac Rehabilitation Attendance After Secondary Myocardial Infarction Through Clinician Messaging and Motivational Calls

The goal of this clinical trial is to determine if a behavioral intervention can increase attendance at cardiac rehabilitation (CR) after secondary/type 2 myocardial infarction in adult patients. The main question it aims to answer is: * Does the ATTEND-CR intervention increase attendance at ≥1 CR exercise session within 140 days of randomization? * Does the intervention increase completion of ≥12 CR exercise sessions within 140 days of randomization? Researchers will compare participants receiving the ATTEND-CR intervention (clinician notifications and a motivational interviewing participant phone call) to usual care to see if attendance and completion of CR improve. Participants: * Clinicians will receive informational messaging regarding CR and the referral process * Participate in a motivational interviewing phone call (intervention group only) * Have follow-up assessments via telephone and electronic health record (EHR) review to track CR attendance, clinical events, and health outcomes