Transthyretin Amyloid Cardiomyopathy Clinical Trial
Exercise Training in Transthyretin Cardiac Amyloidosis
Summary
Transthyretin cardiac amyloidosis causes debilitating heart failure in older adults. The proposed research will develop a personalized exercise training program to improve functional capacity in patients on optimal treatment for transthyretin cardiac amyloidosis. This is a vital next step to improve functional capacity and quality of life of people suffering from transthyretin cardiac amyloidosis.
Full Description
Heart failure (HF) affects over 5 million adults over the age of 65. Cardiac transthyretin amyloidosis (ATTR-CM) is a cause of HF in ~10% of older adults and leads to significant morbidity and mortality. Exercise intolerance is traditionally attributed to cardiac dysfunction but the contribution of other systems to this has not been studied. Musculoskeletal involvement is common in ATTR-CM and occur 5-10 years prior to onset of HF. Tafamidis, a transthyretin stabilizer, is the only approved treatment for ATTR-CM. It slows disease progression, prolongs life, and reduces HF hospitalizations. However, it does not improve functional capacity- no therapeutic intervention has been shown to do so in ATTR-CM.
The idea behind this project is that skeletal muscle dysfunction from amyloidosis and HF severely limits exercise capacity and, thus, quality of life in ATTR-CM, and that targeted exercise training will improve quality of life by improving skeletal muscle performance and aerobic capacity. Cardiopulmonary exercise testing (CPET) and the short physical performance battery (SBBP), including a leg extensor muscle power assessment will be used to achieve the following specific aims; 1) to compare skeletal muscle performance in ATTR-CM and non-amyloid HF; and 2) to determine improvements in aerobic capacity and quality of life due to 12 weeks of supervised exercise training in patients with ATTR-CM. To achieve the second aim, we will use a personalized exercise intervention.
Eligibility Criteria
Inclusion Criteria:
Diagnosis and typing of ATTR-CM by endomyocardial biopsy or by Grade 2 or Grade 3 pyrophosphate (PYP) positivity (exception: nonamyloid control arm in aim 1).
Diagnosis of heart failure, with prior or current need of diuretics and increased N-terminal prohormone B-natureitic peptide (BNP) (≥450 pg/ml).
Peak VO2 <80% predicted, indicating impaired aerobic capacity (for aim 2 only).
Taking tafamidis (for aim 2 only)
Able to walk 4 meters (with or without the use of an assistive device) and independent with basic activities of daily living at the time of enrolment.
Adequate clinical stability has been achieved in the judgment of the investigator to allow participation in study assessments and the intervention.
Signed informed consent document indicating that the patient understands the purpose of and procedures required for the study and is willing to participate in the study.
Exclusion Criteria:
Acute myocardial infarction (Note: given that cardiac biomarkers such as troponin are frequently elevated in ATTR-CM patients, the diagnosis of acute myocardial infarction should be based on clinical diagnosis, not biomarkers alone)
>70% obstructive coronary artery disease
Severe aortic valve stenosis
Already actively participating in formal, facility-based cardiac exercise
Already engaging in regular moderate to vigorous exercise conditioning defined as > 30 minutes per day, ≥ twice per week consistently during the previous 6 weeks
Ventricular assist device
Light chain amyloidosis or other form of non-ATTR amyloidosis
Advanced chronic kidney disease defined as estimated glomerular filtration rate <20 mL/min/1.73m2
Any organ transplantation
Terminal illness other than HF with life expectancy < 1 year
Pacemaker or implantable cardioverter-defibrillato (ICD) with heart rate limits < expected heart rates for exercise and unable to be reprogrammed
Neuropathy due to transthyretin (TTR) mutation
Impairment from stroke, injury or other medical disorder that precludes participation in the intervention
Abnormal cardiopulmonary exercise testing (CPET) finding that requires further investigation and management
Dementia that precludes ability to participate in exercise and follow study protocols
High risk for non-adherence as determined by screening evaluation
Inability or unwillingness to comply with the study requirements
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