The prevalence of isolated atrial amyloid

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Abstract
The frequency of isolated atrial amyloid (IAA), a form of ‘senile’ cardiac amyloidosis, was determined in younger age groups. For the detection of amyloid the Sirius red staining technique was used. IAA first appears in the fourth decade; its prevalence increases roughly linearly by 15–20 per cent with each subsequent decade, reaching 95 per cent in the 81–90 years age group. The prevalence is higher in females than in males.