Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.
Inclusion Criteria:
- Subject is clinically stable without cardio-vascular-related hospitalizations within 6 weeks prior to enrollment as assessed by the investigators.
- Subject is able to provide written informed consent and is willing and able to complete study procedures.
- Currently in sinus rhythm by clinical assessment or documented electrocardiographic studies.
- Subject and disease characteristics noted by medical record review:
- Healthy control volunteers must also meet the following criteria: Karnofsky performance scale > 80%; ECOG status 0 or 1.
- ATTR cardiac amyloidosis based on meeting all the following criteria: Diagnosis of amyloidosis within two years prior to study screening; Documentation of absence of AL, heavy chain disease, multiple myeloma or malignant
lymphoproliferative disorders; Transthyretin amyloid deposits in cardiac tissue OR technetium (99mTc) pyrophosphate scintigraphy with grade 2 or 3 cardiac uptake OR Transthyretin amyloid deposits in non-cardiac tissue with echocardiographic evidence of cardiac involvement or an end-diastolic mean wall thickness > 12mm OR
Transthyretin amyloid deposits in non-cardiac tissue with CMR diagnostic of amyloidosis
- AL with cardiac involvement based on meeting all the following criteria: Diagnosis of amyloidosis within two years prior to study screening; Histopathologic diagnosis of amyloidosis with AL protein identification by mass
spectrometry or immuno-histochemistry; Documented clinical signs or symptoms consistent with heart failure; Cardiac involvement as defined by: Amyloid deposits in cardiac deposits OR Echocardiography with an end-diastolic mean wall thickness > 12 mm in the absence of other causes OR Elevated NT-proBNP (> 332 ng/L) in the absence of renal failure or atrial fibrillation OR CMR diagnostic of amyloidosis;
- AL without cardiac involvement based on meeting all the following criteria: Diagnosis of amyloidosis within two years prior to study screening; Histopathologic diagnosis of amyloidosis with AL protein identification by mass
spectrometry or immuno-histochemistry; No documented clinical signs and symptoms consistent with heart failure from AL; Absence of cardiac involvement as defined by: Echocardiography with an end-diastolic mean wall thickness < 13 mm if the subject does not have other causes for increased wall thickness AND NT-proBNP < 333 ng/L if the subject does not have renal failure or atrial fibrillation AND
No CMR diagnostic of amyloidosis if CMR is available prior to screening.
Exclusion Criteria:
- Unable to consent or unable to complete all study procedures.
- Unable to ambulate for 6 minutes (confirmed at study coordinator visit).
- Unable to maintain in supine position for 30 minutes.
- Unable to maintain breath-holding for 10 seconds (confirmed at study coordinator visit).
- Contraindications for safe CMR scanning (e.g., claustrophobia, cochlear implant, implanted neural stimulator).
- Presence of implantable cardiac pacemaker, defibrillator or recorder.
- History of intracardiac prosthesis, congenital heart disease, intracardiac shunt, prior intrathoracic surgery, or procedures to the thoracic aorta or pulmonary arteries.
- Significant artifact from prior MRI studies.
- Pregnant or breast-feeding women.
- Weight equal to or greater than 155 kg.
- Maximum body side-to-side or anterior-posterior diameter equal to or greater than 70 cm.
- Documented non-sinus rhythm within 6 months prior to screening.
- For healthy controls, the following exclusion criteria apply, confirmed per chart review and/or patient report:
- History of cardiomyopathy or structural heart disease;
- History of valvular disease of greater than mild severity;
- History of coronary artery disease or coronary heart disease;
- History of cardiac or thoracic surgery.
- History of atrial tachyarrhythmia, ventricular tachyarrhythmia, or symptomatic bradyarrhythmia;
- Left ventricular hypertrophy or abnormally increased myocardial thickness by prior echocardiography, cardiac computed tomography, or CMR;
- Acute kidney injury, OR chronic renal disease with glomerular filtration rate < 60 mL/min/1.73m^2 as per medical record review.
- Uncontrolled hypertension of systolic blood pressure > 140 mmHg or diastolic blood pressure > 90 mmHg as per medical record review;
- Taking two or more anti-hypertensive medications;
- Type 1 diabetes, OR uncontrolled type 2 diabetes mellitus of hemoglobin A1c greater than 7, as per medical record review;
- Taking two or more diabetic medications;
- History of stroke or transient ischemic attack;
- Current cigarette smoker;
- History of peripheral artery disease of aortopathy;
- History of plasma cell dyscrasia or chronic hematologic diagnosis;
- BMI > 35 kg/m^2.
Note: Other protocol defined Inclusion/Exclusion Criteria may apply.
Eligibility last updated 12/28/23. Questions regarding updates should be directed to the study team contact.