TRITON-CM: A Study to Evaluate Nucresiran in Patients With Transthyretin Amyloidosis With Cardiomyopathy

The purpose of this study is to: * Evaluate the efficacy of nucresiran compared to placebo on reducing all-cause mortality and cardiovascular (CV) events * Evaluate the efficacy of nucresiran compared to placebo on additional assessments of CV events and/or death * Evaluate the efficacy of nucresiran compared to placebo on patient-reported health status and health-related quality of life

Inclusion Criteria * Has documented diagnosis of ATTR amyloidosis with cardiomyopathy including those with hereditary ATTR (hATTR) or wild-type ATTR (wATTR) amyloidosis. * Has medical history of heart failure (HF) with at least 1 prior hospitalization for HF or signs and symptoms that require treatment with a diuretic. * Has screening N-terminal prohormone B-type natriuretic peptide (NT-proBNP) \>300 ng/L and \600 ng/L and \