Across both sets, 46 398 (16·0%) videos corresponded to hypertrophic cardiomyopathy, 8842 (3·0%) to transthyretin amyloid cardiomyopathy, 41 465 (14·3%) to severe aortic stenosis, and 193 952 (66·8%) were used as controls. Here, TTR is linked to cardiac amyloidosis.