Pre-operative Rehabilitation for Reduction of Hospitalization After Coronary Bypass and Valvular Surgery.

PREHAB will be a three centre prospective, randomized, open, blinded endpoint (PROBE) controlled trial using assessor blinding and intention-to-treat analysis. The study will be conducted at three academic, tertiary care hospitals (St. Boniface Hospital, Winnipeg, MB, Montreal Heart Institute. Montreal QC and Queen Elizabeth II Health Sciences Centre, Halifax, NS) and one non-academic hospital (Saint John Regional Health Centre, Saint John, NB) that perform cardiac surgery. These sites were chosen based on similar patient populations and surgical waitlist times. Additionally, each of these sites are partnered with one or more community-based cardiac rehabilitation (CR) centres, which are certified medical fitness facilities dedicated to improving the health of the community through health promotion, disease prevention and rehabilitation services. These facilities offer expert guidance from certified professionals, innovative health enhancement programs, and provide integrated medical, rehabilitative and fitness services. The investigators intend to recruit a total of 244 participants to the study (122 per study arm), anticipating a 20% dropout rate to achieve an eventual sample size of 194 participants.

Patients in the PREHAB group will receive, in addition to standard of care, an eight-week comprehensive exercise therapy and education program at a community-based CR facility. This program will target both the physical and psycho-social-cognitive aspects of cardiac disease and frailty. In brief, participants will be required to complete an intake health status assessment by the CR team including a physiotherapist, cardiovascular nurse, and dietitian and complete a symptom-limited graded exercise stress test according to the American College of Sports Medicine Guidelines for Exercise Testing and Prescription 7th Edition. Patients will be asked to complete at least two sessions of supervised, structured exercise class plus have the option to attend one additional exercise class per week for eight-weeks, with progression to a moderate to high-intensity interval program based on the supervised assessment of the patient's capabilities. This has been shown to be safe and effective in unrepaired heart failure and elderly patients. PREHAB participants will also attend four education sessions on topics such as risk factor reduction, medication use, cardiovascular physiology, smoking cessation, healthy eating, exercise, and stress management and promotion of self-managed care.

Inclusion criteria

• Patients aged 60 years and older, undergoing elective isolated coronary artery bypass grafting (CABG), aortic valve repair/replacement for moderate aortic stenosis or severe regurgitation, mitral valve repair/replacement for moderate stenosis or severe regurgitation or combined CABG/valve procedures
• Patients with Clinical Frailty Score (CFS) ≥3 (vulnerable) and < 7 (8 = very severely frail, approaching end-of-life or 9 = terminally ill) at time of acceptance for cardiac surgery
• Patients with an estimated ≥ 6 week wait time

Exclusion criteria

• Patients who have unstable or recent unstable cardiac syndrome as defined by:

• Severe heart failure (NYHA IV) or angina (CCS class IV) symptoms
• Critical left main (LM) coronary disease
• Hospitalization for arrhythmias, congestive heart failure or acute coronary syndrome prior to randomization
• Patients who have severe left ventricular obstructive disease as defined by:

• Severe aortic or mitral stenosis (aortic or mitral valve area <1.0cm2 or mean gradient > 40 mmHg or > 10 mmHg respectively)
• Dynamic left ventricular (LV) outflow obstruction
• Patients who have demonstrated exercise induced ventricular arrhythmias or have experienced a recent hospitalization for arrhythmias
• Patients who have cognitive deficits that would preclude rehabilitation
• Patients who have physical limitations that would preclude rehabilitation
• Patients who are unable to attend the Prehab program