ATTR-Cardiomyopathy Stabilization Following Tafamidis Therapy

The study will investigate the stabilization effects of Tafamidis utilizing cardiac imaging cardiac magnetic resonance imaging (CMR). The investigators propose to pursue the following specific aims: 1. Utilize cardiac magnetic resonance to assess stabilization of ATTR after Tafamidis therapy based on extracellular volume mapping. 2. Investigate left ventricular myocardial mass, native T1, T2, and extracellular volume mapping after 12 month follow-up. 3. Utilize cardiac magnetic resonance feature tracking at baseline and at 12 month follow-up.