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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.
The main pumping chamber of the heart, the left ventricle, typically enlarges first. As the pressure rises in the left ventricle, the left atrium gradually enlarges as well. When left atrial enlargement occurs due to elevated blood pressure, it is associated with an increased risk of heart attack and stroke.