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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.
Left atrium: one of four chambers of the heart; pumps oxygenated blood from the lungs in to the left ventricle. Left ventricle: one of four chambers of the heart; pumps oxygenated blood out to the body. Lower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium.Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.ower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium. Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.