cardiomyopathy

To the Editor: Systemic amyloidosis results from extracellular deposition of fibrillar material derived from aggregation of precursor proteins into insoluble beta-pleated sheets. The most frequently recognized types are due to prolonged inflammation, deposition of immunoglobulin light chains, and accumulation of transthyretin, a tetrameric protein synthesized in the liver. Transthyretin amyloidosis can occur owing to wild-type or autosomal-dominant mutant transthyretin and...