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Best Answer: An enlarged left atrium means simply that the atrium that pumps blood in the ventricle that pumps blood to the rest of the body is larger than it should be, the seriousness depends on the size of the enlargement, a small enlargement usually won't pose any noticable problems, however, a larger deviation from normal size can lead to problems ranging from electrical dissarray such as atrial fibrillation to stroke, due to blood pooling in the atrium.
Causes of Left Atrial Enlargement. Overview. The left atrium is the chamber of the heart that receives oxygen-rich blood from the lungs. Blood moves from the left atrium through the mitral valve into the main pumping chamber of the heart -- the left ventricle -- and then out to the body.