Phase 1 Cardiac Rehabilitation: Definition, Duration, and Transition to Outpatient Care

Definition and Scope

• Phase 1 cardiac rehabilitation is an inpatient program that provides preventive and rehabilitative services to patients hospitalized after an index cardiovascular event such as myocardial infarction, acute coronary syndrome, coronary artery bypass grafting, or percutaneous coronary intervention. [American College of Cardiology] 1

Duration of the Inpatient Phase

• The duration of Phase 1 is not a preset number of days; it extends for the entire acute hospital stay of the patient. [American College of Cardiology] 1

• Phase 1 concludes at the time of hospital discharge, marking the end of the inpatient rehabilitation component. [American College of Cardiology; Circulation] [1][2]5

Transition to Phase 2 (Early Outpatient Rehabilitation)

• Phase 2 (early outpatient cardiac rehabilitation) is initiated 1–3 weeks after hospital discharge and typically continues for 3–6 months, with some programs extending up to 1 year. [American College of Cardiology; Circulation] [1][2][5][6]

• A submaximal exercise test performed 4–6 days after the index event is recommended for prognostic assessment and to guide activity prescription. [American Heart Association] 7

• Enrolling patients in an outpatient cardiac rehabilitation program within 21 days of discharge is advised to optimize clinical outcomes. [American Heart Association] 8

Factors Influencing the Length of Phase 1

• The type of cardiac event influences the inpatient rehabilitation length; myocardial infarction, coronary artery bypass grafting, valve surgery, and heart transplantation each have distinct hospitalization trajectories. [American College of Cardiology; Circulation] [1][5]

• Medical stability of the patient determines readiness for discharge and therefore the completion of Phase 1. [American College of Cardiology] 1

• (Evidence strength not explicitly stated in the source material.)