<unk>  (stiff heart syndrome) is a condition resulting in the death of part of the myocardium (heart muscle). It is associated with the systemic production and release of many<unk> ogenic proteins, especially immunoglobulin light chain or transthyretin (TTR). It can be characterized by the extracellular deposition of<unk> s, foldable proteins that stick together to build fibrils in the heart. The<unk>  can be seen under polarized light in congo red stained biopsy.
Amyloid cardiomyopathy
Cardiac amyloidosis
Alcoholic cardiomyopathy
Viral cardiomyopathy
Phidippides cardiomyopathy
Diabetic cardiomyopathy
Dilated cardiomyopathy
Noncompaction cardiomyopathy