Mitochondrial Function in Transthyretin Amyloidosis

Inclusion Criteria: * Have a parietal thickness measuring more than 15 mm on the echocardiography or have structural and echogenicity abnormalities characteristic of cardiac amyloidosis, * Live in Martinique, * Accept the use of the residues coming from biopsies of the subcutaneous abdominal adipose tissue performed during the medical care. Exclusion Criteria: * Be under 18 years old, * Have a contraindication to subcutaneous biopsy, * Be allergic to local anesthetics, * Pregnant or nursing woman, * Have a cardiovascular disease suggesting a secondary cardiac disease, such as documented severe hypertension, valvular stenosis, or a known familial cardiomyopathy, * Be major under guardianship / curatorship or deprived of liberty, * Not be able to answer to a simple administrative questionnaire or to give freely its non-opposition.