Background: The demand for percutaneous coronary intervention (PCI) exerts constant pressure on health care systems to meet the growing needs of patients. The practice of same-day discharge PCI has emerged as a medically safe option to optimize resource utilization and improve access to care. Aim: The purpose of this study was to describe elective same-day discharge PCI patients' self-care behaviour in the two to five days following their procedure, and the factors associated with cardiac self-efficacy (CSE) and self-care agency (SCA). Methods: Using a cross-sectional correlational design, 98 consecutive patients were contacted by telephone, following PCI, and asked about their CSE, SCA, and adherence to discharge recommendations. Associations between selected variables were explored through multiple regression analysis. Results: The findings revealed a high degree of adherence to discharge recommendations, although participants' appreciation of the long term management of their chronic disease was limited. Factors associated with lower levels of CSE and SCA included the burden of having additional chronic co-morbidities, living alone and lacking social support, and a positive screening for psychosocial distress. Conclusion: Same-day discharge PCI presents a sustainable option for delivery of care for most patients. Some clients may require additional support to manage the transition between acute intervention and chronic disease management. Crown