S ince recognizing the benefits of exercise training 1 and establishing early outpatient cardiac rehabilitation (ECR, commonly referred to as phase II CR) programs for a number of cardiac conditions (eg, myocardial infarction [MI], coronary angioplasty or stent, coronary artery bypass graft, stable angina, heart failure with an ejection fraction ≤35%, heart transplant, valve repair, or replacement), a consistently growing body of evidence has highlighted numerous health-related benefits associated with ECR participation. 2,3 These studies have similarly reported reduced hospitalization rates, recurrence of events, mortality risk, improved physical and physiologic function, and perhaps most meaningful to patients, quality of life. The convincing body of data has fostered recognition within the clinical field of the value of ECR in the continuum of managing individuals with cardiovascular disease (CVD), and as a result, ECR has received the highest levels of evidence-based recommendation from both national and international organizations. [4][5][6] Collectively, one would assume that widespread enrollment among qualifying patients would occur. Unfortunately, this has historically not been the case. 7 Maintenance cardiac rehabilitation (MCR, commonly referred to as phase III/IV CR) has been utilized to assist patients who have completed ECR to continue in the lifelong process of CVD management. The MCR components may include all of the secondary prevention practices including exercise training, adherence with cardioprotective medications, periodic appointments with health care providers, healthy nutrition, and CVD risk factor management. 8,9 Although there have been comparatively fewer studies reporting MCR enrollment and adherence rates, it is clear from the available data that rates are also suboptimal. 10 Despite the continued challenges of CR enrollment and adherence, many organization-led initiatives have provided strategies to promote increases in CR participation while reports of innovative and effective institutional efforts offer a road map to nullifying common barriers that limit CR utilization. This review highlights current data on enrollment and adherence to ECR and MCR, discusses evidence-based programmatic strategies to support CR utilization, and offers areas needing further exploration and consideration.
EARLY OUTPATIENT CARDIAC REHABILITATIONA large proportion of patients with diagnoses that make them eligible for ECR receive insurance coverage through Medicare. 11,12 This has presented investigators with an opportunity to routinely survey administrative data to identify trends in ECR enrollment across the country. The most recent examination of Medicare fee-for-service beneficiaries (≥65 yr) enrolling in ≥1 ECR session, between 2016 and 2017, found that little progress in increasing national enrollment rates was made since previous large-scale analyses (Figure 1), 7,13,14 with only a quarter of qualifying patients participating in ECR. 15 A greater proportion of MI patients undergoing percutaneous...