How to Image Cardiac Amyloidosis: A Practical Approach

Area of Science:

• Cardiology
• Medical Imaging
• Cardiovascular Disease

Background:

• Cardiac amyloidosis (CA) is a severe, rapidly progressive heart disease.
• Untreated CA has a poor prognosis, with survival ranging from <6 months to 3-5 years depending on the type.
• Early diagnosis and precise typing of CA are essential for effective patient management.

Purpose of the Study:

• To present a practical guide for utilizing key imaging modalities in diagnosing cardiac amyloidosis.
• To emphasize the importance of early detection for initiating novel disease-modifying therapies.
• To review the roles of echocardiography, cardiac magnetic resonance, and radionuclide imaging in CA evaluation.

Main Methods:

• Review of current literature and clinical guidelines on cardiac amyloidosis imaging.
• Discussion of echocardiographic features suggestive of CA.
• Explanation of cardiac magnetic resonance (CMR) protocols and findings in CA.
• Overview of radionuclide imaging techniques (e.g., bone scintigraphy) for CA typing.

Main Results:

• Echocardiography can reveal characteristic patterns of cardiac amyloidosis, such as increased ventricular wall thickness and diastolic dysfunction.
• CMR offers valuable insights into tissue characterization, aiding in the diagnosis and differentiation of CA subtypes.
• Radionuclide imaging, particularly with specific tracers, is critical for determining the type of amyloidosis (e.g., transthyretin vs. light-chain).

Conclusions:

• Integrated imaging approaches combining echocardiography, CMR, and radionuclide studies are vital for accurate and timely CA diagnosis.
• Early identification of CA enables prompt initiation of targeted therapies, significantly improving patient outcomes.
• This review provides a framework for clinicians to optimize the use of cardiac imaging in suspected and confirmed CA cases.