Purpose: To examine: (1) the rate of clinical events precluding cardiac rehabilitation (CR) continuation, (2) CR attendance by component in those without events, and (3) the association between disease severity (e.g., tobacco use, diabetes, and depression) and component attendance (e.g., exercise, diet, stress management, tobacco cessation).Methods: Retrospective analysis of electronic records of the CR program in London, Ontario from 1999-2017. Patients in the supervised program are offered exercise sessions twice per week, with a minimum of 48 prescribed sessions tailored to patient need. Patients attending ≥1 session without major factors that would limit their exercise ability were included. Intervening events were recorded, as was component attendance.Results: Of 5508 enrolled, supervised patients, 3696 did not have a condition that could preclude exercise. Of these, one-sixth (n=912) had an intervening event; these patients were less likely to work, more likely to have medical risk factors, had more severe angina and depression, and lower functional capacity. The remaining cohort attended a mean of 26.49±21.30 sessions overall (median=27; 19.36% attending ≥48 sessions), including 20.49±17.45 exercise sessions (median=21). After exercise, the most common components attended were individual dietary and psychological counselling. Patients with more severe angina and depressive symptoms as well as tobacco users attended significantly fewer total sessions, but more of some specific components. Conclusions: In 1/6 of patients, CR attendance and completion are impacted by clinical factors beyond their control. Many patients are taking advantage of components specific to their risk factors, buttressing the value of individually-tailored, menu-based programming.