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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 ventricle in a patient with aortic atresia and normally developed left ventri-cle. The large ventricular septal defect is not visible in this projection. The left atrium (LA) is dilated. The mitral valve (my) appears normal, with two normally formed papillary muscles (p).