<prompt> Answer this question truthfullyWhat is the relationship between unstable angina, non-ST elevation myocardial infarction, and cardiac rehabilitation?  <response>: <reason> Physician referral is the most powerful predictor of patient participation in a cardiac rehabilitation program.Affordability of service, Insurance coverage noncoverage, Social support from a spouse or other caregiver, Gender-specific attitudes, Patient-specific internal factors such as anxiety or poor motivation, and Logistical and financial constraints, or a combination of these factors. 