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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.
bet. left atrium & left ventricle - has 2 cusps known as bicuspid valve. Opens as left atrium contracts to allow blood flow from the left atrium into left ventricle, then it closes to prevent blood flow from flowing back into left atrium.