Atrial septal aneury: Ejection fraction 50-55% is normal and the change from 65% to 55% may well be within the variation of the measuring technology. Atrial septal aneurysm is generally not per se dangerous or life threatening though it can cause problems. Read this for more info: http://circ.ahajournals.org/content/91/11/2785.full
Answered 5/9/2019
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