CARDIO-TTRansform Magnetic Resonance Imaging (MRI) Sub-study

The CARDIO-TTRansform Magnetic Resonance Imaging (MRI) Sub-study

The main purpose of this study is to measure the amyloid burden, defined as extracellular volume (ECV) assessed by Magnetic Resonance Imaging (MRI) over time in a subset of up to 150 participants enrolled in ION-682884-CS2 (NCT04136171).

This pilot study will determine the efficacy of ION-682284 in reducing the amyloid deposit on the heart tissue compared to placebo.

Inclusion Criteria:

To participate in the ION-682884-CS2MRI sub-study, participants must meet all inclusion criteria of the study protocol ION-682884-CS2 (NCT04136171).

Exclusion Criteria

1. Contraindication or sensitivity to MRI contrast agents
2. Orthopnea of sufficient severity to preclude supine scanning at screening.
3. Weight or body girth exceeds the limits of the cardiac MRI machine specifications.
4. Contraindication to cardiac MRI scanning, as assessed by local MRI safety questionnaire/checklist.