Special Section – Invited Reviews Focused on Important Topics in CREnrollment and Adherence to Early Outpatient and Maintenance Cardiac Rehabilitation ProgramsOzemek, Cemal PhD; Squires, Ray W. PhD Author Information Department of Physical Therapy, College of Applied Health Sciences, University of Illinois at Chicago, Chicago (Dr Ozemek); and Department of Cardiovascular Medicine, Division of Preventive Cardiology, Mayo Clinic and Foundation, Rochester, Minnesota (Dr Squires). Correspondence: Cemal Ozemek, PhD, Department of Physical Therapy, College of Applied Health Sciences, University of Illinois at Chicago, 1640 W. Roosevelt Rd, Room 308A, Chicago, IL 60608 ([email protected]). The authors declare no conflicts of interest. Journal of Cardiopulmonary Rehabilitation and Prevention 41(6):p 367-374, November 2021. | DOI: 10.1097/HCR.0000000000000645 Buy Metrics AbstractIn Brief Early outpatient (ECR) and maintenance cardiac rehabilitation (MCR) programs are essential, evidence-based services that have received unequivocal endorsement by national and international professional organizations. However, the latest data characterizing ECR enrollment and adherence fell well short of what would be expected for a therapy that has accumulated decades of empirical evidence touting the associated physiologic, physical, psychosocial, and financial benefits. Although national participation levels have remained stagnant, a series of recent publications showcase effective strategies that could bolster both ECR enrollment and adherence levels at the institutional level. Unlike ECR, fewer reports on enrollment and adherence rates exist for MCR, partly due to the lack of standardization of this service. In this review, we aim to highlight current data on enrollment and adherence to ECR and MCR and discuss evidence-based programmatic strategies to support utilization of both services. This review highlights current data on enrollment and adherence to early outpatient and maintenance cardiac rehabilitation and discuss evidencebased programmatic strategies to support utilization of both services. © 2021 Wolters Kluwer Health, Inc. All rights reserved.