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Cardiac Rehabilitation Phases

Definition / Explanation

Cardiac rehabilitation (CR) is a structured, physician-supervised, multistage intervention designed to restore optimal physical, psychological, and social functioning in patients recovering from acute cardiovascular events — including myocardial infarction (MI), coronary artery bypass grafting (CABG), percutaneous coronary intervention (PCI), stable angina, heart failure, and valve repair surgeries. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md] The 2024 AHA/ACC/AACVPR joint statement establishes CR as a Class 1 therapeutic recommendation. ^[raw/AHA_ACC_AACVPR_2024_Core_Components.md]

CR is divided into four distinct clinical phases that sequentially transition a patient from acute hospitalization to independent, lifelong self-managed wellness. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

The Four Phases

Phase I — Acute Inpatient

Timeline: Initiated immediately following clinical stabilization; typically spans the duration of the hospital stay (a few days to 1–2 weeks).

Primary Goals: Prevent hospital-related physical deconditioning, evaluate acute cardiovascular responses to basic mobility, complete safe discharge planning. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Core Activities: Passive range-of-motion, assisted sitting and standing, deep diaphragmatic breathing, short-hallway ambulation. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Monitoring: Continuous ECG telemetry, resting and exertional blood pressure, oxygen saturation, cardiac enzyme tracking. ^[raw/cardiac-recovery-fitness-protocol-deep-research.md]

Phase II — Early Outpatient (Subacute)

Timeline: Begins within 1–2 weeks of hospital discharge; typically spans 3–12 weeks. Insurance commonly covers 36 sessions (3×/week for 12 weeks). ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Primary Goals: Develop a physician-signed Individualized Treatment Plan (ITP), safely progress aerobic capacity and basic strength, establish heart-healthy routines. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md] The 2024 guidelines expanded this component to explicitly include body composition assessment (lean muscle mass and fat distribution) alongside weight management. ^[raw/AHA_ACC_AACVPR_2024_Core_Components.md]

Core Activities: Treadmill walking, recumbent stationary biking, light resistance band training, flexibility work. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Monitoring: Continuous 12-lead ECG telemetry during exercise, pre/post exercise blood pressure, blood glucose checks if diabetic. The ITP must be formally updated every 30 days with weekly clinical team progress reviews. ^[raw/AHA_ACC_AACVPR_2024_Core_Components.md]

Phase III — Intensive Outpatient

Timeline: Typically 6–12 weeks following Phase II completion. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Primary Goals: Maximize cardiorespiratory endurance and lean muscle mass; transition patient toward independent self-monitoring. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md] The 2024 framework formally separated strength training into its own independent core component — reflecting the robust evidence base for progressive resistance exercise in CR. ^[raw/AHA_ACC_AACVPR_2024_Core_Components.md]

Core Activities: Progressively longer treadmill walks, rowing machine, elliptical training, stair stepping, full-body circuit training. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Monitoring: Shift from continuous ECG telemetry to intermittent spot-checks. Patient actively tracks own heart rate and perceived exertion (Borg RPE). ^[raw/cardiac-recovery-fitness-protocol-deep-research.md]

Phase IV — Long-Term Maintenance

Timeline: Lifelong, ongoing. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Primary Goals: Sustain cardiorespiratory fitness, prevent muscular atrophy, maintain heart-healthy behaviors, minimize risk of recurrence. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Core Activities: Community walking groups, lap swimming, outdoor cycling, home-based strength maintenance, restorative yoga, Tai Chi. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Monitoring: Unsupervised self-monitoring of heart rate and RPE with periodic outpatient cardiology follow-ups. ^[raw/Clinical_Review_of_Cardiac_Rehabilitation_Phases.md]

Intake Assessment (Phase II Entry)

Before commencing Phase II, clinical staff must perform a comprehensive assessment beyond cardiorespiratory metrics — including cognitive function, frailty, fall risk, and standard postural balance tests (feet side-by-side, instep stance, tandem stance, single-leg stand). Home environment, current pharmacotherapy, and 12-lead ECG baseline must be documented. ^[raw/AHA_ACC_AACVPR_2024_Core_Components.md]