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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.
From here, the blood enters the left side of the heart from where it is pumped all round your body. Because the left side of the heart has to work harder to get blood round your body, it is usually this side that becomes enlarged when your blood pressure is too high. This is sometimes called left ventricular hypertrophy or LVH for short. In other words, it is another name for an enlarged heart.